2.6.29-rc5: Reported regressions 2.6.27 -> 2.6.28

2.6.29-rc5: Reported regressions 2.6.27 -> 2.6.28

[Rafael J. Wysocki]

This message contains a list of some regressions introduced between 2.6.27 and
2.6.28, for which there are no fixes in the mainline I know of.  If any of them
have been fixed already, please let me know.

If you know of any other unresolved regressions introduced between 2.6.27
and 2.6.28, please let me know either and I'll add them to the list.
Also, please let me know if any of the entries below are invalid.

Each entry from the list will be sent additionally in an automatic reply to
this message with CCs to the people involved in reporting and handling the
issue.


Listed regressions statistics:

  Date          Total  Pending  Unresolved
  ----------------------------------------
  2009-02-15      152       30          26
  2009-02-04      149       33          30
  2009-01-20      144       30          27
  2009-01-11      139       33          30
  2008-12-21      120       19          17
  2008-12-13      111       14          13
  2008-12-07      106       20          17
  2008-12-04      106       29          21
  2008-11-22       93       25          15
  2008-11-16       89       32          18
  2008-11-09       73       40          27
  2008-11-02       55       41          29
  2008-10-25       26       25          20


Unresolved regressions
----------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12690
Subject		: DPMS (LCD powersave, poweroff) don't work
Submitter	: Antonin Kolisek <akolisek-T3ps84XAcx36AaHJ4hbVU+3CNBr840j2@public.gmane.org>
Date		: 2009-02-11 09:40 (4 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12658
Subject		: ThrustMaster Firestorm Dual Power 3 Gamepads stopped working
Submitter	: Frank Roscher <Frank-Roscher-hi6Y0CQ0nG0@public.gmane.org>
Date		: 2009-02-08 08:45 (7 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12645
Subject		: DMI low-memory-protect quirk causes resume hang on Samsung NC10
Submitter	: Patrick Walton <pcwalton-764C0pRuGfqVc3sceRu5cw@public.gmane.org>
Date		: 2009-02-06 18:35 (9 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0af40a4b1050c050e62eb1dc30b82d5ab22bf221


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12634
Subject		: video distortion and lockup with i830 video chip and 2.6.28.3
Submitter	: Bob Raitz <pappy_mcfae-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>
Date		: 2009-02-04 21:10 (11 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12619
Subject		: Regression 2.6.28 and last - boot failed
Submitter	: jan sonnek <ha2nny-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2009-02-01 19:59 (14 days old)
References	: http://marc.info/?l=linux-kernel&m=123351836213969&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12559
Subject		: Huawei E169 doesn't work as mass storage anymore
Submitter	: kpalberg <kpalberg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2009-01-28 02:34 (18 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12500
Subject		: r8169: NETDEV WATCHDOG: eth0 (r8169): transmit timed out
Submitter	: Justin Piszcz <jpiszcz-BP4nVm5VUdNhbmWW9KSYcQ@public.gmane.org>
Date		: 2009-01-13 21:19 (33 days old)
References	: http://marc.info/?l=linux-kernel&m=123188160811322&w=4
Handled-By	: Francois Romieu <romieu-W8zweXLXuWQS+FvcfC7Uqw@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12465
Subject		: KVM guests stalling on 2.6.28 (bisected)
Submitter	: Kevin Shanahan <kmshanah-biM/RbsGxha6c6uEtOJ/EA@public.gmane.org>
Date		: 2009-01-17 03:37 (29 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12421
Subject		: GPF on 2.6.28 and 2.6.28-rc9-git3, e1000e and e1000 issues
Submitter	: Doug Bazarnic <doug-nOyj/A09A+/k1uMJSBkQmQ@public.gmane.org>
Date		: 2009-01-09 21:26 (37 days old)
References	: http://marc.info/?l=linux-kernel&m=123153653120204&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12411
Subject		: 2.6.28: BUG in r8169
Submitter	: Andrey Vul <andrey.vul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-31 18:37 (46 days old)
References	: http://marc.info/?l=linux-kernel&m=123074869611409&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12409
Subject		: NULL pointer dereference at get_stats()
Submitter	: Tetsuo Handa <penguin-kernel-1yMVhJb1mP/7nzcFbJAaVXf5DAMn2ifp@public.gmane.org>
Date		: 2008-12-30 12:53 (47 days old)
References	: http://marc.info/?l=linux-kernel&m=123064167008695&w=4
Handled-By	: Frederik Deweerdt <frederik.deweerdt-kjvbsxwSFqI@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12408
Subject		: Funny problem with 2.6.28: Kernel stalls
Submitter	: Michael Roth <mroth-+8Z3Oe2AQjqzQB+pC5nmwQ@public.gmane.org>
Date		: 2008-12-25 15:14 (52 days old)
References	: http://marc.info/?l=linux-kernel&m=123021931714282&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12407
Subject		: Kernel 2.6.28 regression: Hang after hibernate
Submitter	: Frank Groeneveld <frankgroeneveld-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-28 20:34 (49 days old)
References	: http://marc.info/?l=linux-kernel&m=123049651906081&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12405
Subject		: oops in __bounce_end_io_read under kvm
Submitter	: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Date		: 2008-12-26 17:36 (51 days old)
References	: http://marc.info/?l=linux-kernel&m=123031303400676&w=4
Handled-By	: Jens Axboe <jens.axboe-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12404
Subject		: Oops in 2.6.28-rc9 and -rc8 -- mtrr issues / e1000e
Submitter	: Kernel <kernel-nOyj/A09A+/k1uMJSBkQmQ@public.gmane.org>
Date		: 2008-12-22 9:37 (55 days old)
References	: http://marc.info/?l=linux-kernel&m=122993873320150&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12403
Subject		: TTY problem on linux-2.6.28-rc7
Submitter	: sasa sasa <sasak.1983-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-22 4:23 (55 days old)
References	: http://marc.info/?l=linux-kernel&m=122991914600390&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12401
Subject		: 2.6.28 regression: xbacklight broken on ThinkPad X61s
Submitter	: Tino Keitel <tino.keitel-Mmb7MZpHnFY@public.gmane.org>
Date		: 2009-01-05 8:39 (41 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=22c13f9d8179f4c9caecfcb60a95214562b9addc
References	: http://marc.info/?l=linux-kernel&m=123114479110314&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12395
Subject		: 2.6.28-rc9: oprofile regression
Submitter	: Tim Blechmann <tim-xpEK/MU0Hawdnm+yROfE0A@public.gmane.org>
Date		: 2008-12-21 14:23 (56 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b99170288421c79f0c2efa8b33e26e65f4bb7fb8
References	: http://marc.info/?l=linux-kernel&m=122986946614791&w=4
Handled-By	: Andi Kleen <ak-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12337
Subject		: ~100 extra wakeups reported by powertop
Submitter	: Alberto Gonzalez <luis6674-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-31 12:25 (46 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12265
Subject		: FPU emulation broken in 2.6.28-rc8 ?
Submitter	: Rogier Wolff <R.E.Wolff-bu/CaDbLbdHGjfRZg6uqBA@public.gmane.org>
Date		: 2008-12-17 8:56 (60 days old)
References	: http://marc.info/?l=linux-kernel&m=122950463030747&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12263
Subject		: Sata soft reset filling log
Submitter	: Justin Madru <bevicm-QP1aEjBt37AFQeE35raUng@public.gmane.org>
Date		: 2008-12-13 2:07 (64 days old)
References	: http://marc.info/?l=linux-kernel&m=122913412608533&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12224
Subject		: journal activity on inactive partition causes inactive harddrive spinup
Submitter	: C Sights <csights-97jfqw80gc6171pxa8y+qA@public.gmane.org>
Date		: 2008-12-14 11:39 (63 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c87591b719737b4e91eb1a9fa8fd55a4ff1886d6
Handled-By	: Eric Sandeen <sandeen-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12209
Subject		: oldish top core dumps (in its meminfo() function)
Submitter	: Andreas Mohr <andi-5+Cda9B46AM@public.gmane.org>
Date		: 2008-12-12 18:49 (65 days old)
References	: http://marc.info/?l=linux-kernel&m=122910784006472&w=4
		  http://marc.info/?l=linux-kernel&m=122907511319288&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
Date		: 2008-12-12 9:35 (65 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12160
Subject		: networking oops after resume from s2ram (2.6.28-rc6)
Submitter	: Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-11-28 21:15 (79 days old)
References	: http://marc.info/?l=linux-kernel&m=122790701615723&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12061
Subject		: snd_hda_intel: power_save: sound cracks on powerdown
Submitter	: Jens Weibler <bugzilla-kernel-6hJTtV8wudIr9FUcG+3rRQ@public.gmane.org>
Date		: 2008-11-18 12:07 (89 days old)
Handled-By	: Takashi Iwai <tiwai-l3A5Bk7waGM@public.gmane.org>


Regressions with patches
------------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12614
Subject		: WOL with forcedeth broken since f55c21fd9a92a444e55ad1ca4e4732d56661bf2e
Submitter	: Philipp Matthias Hahn <pmhahn-u4khhh1J0LzF41mA0N3lWw@public.gmane.org>
Date		: 2009-01-29 6:31 (17 days old)
References	: http://marc.info/?l=linux-kernel&m=123321232825316&w=4
Handled-By	: Yinghai Lu <yinghai-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
		  Tobias Diedrich <ranma+kernel-YxUgxmcw2FPQD6PfKP4TzA@public.gmane.org>
Patch		: http://marc.info/?l=linux-kernel&m=123330459229248&w=4
		  http://marc.info/?l=linux-kernel&m=123411195117835&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12612
Subject		: hard lockup when interrupting cdda2wav
Submitter	: Matthias Reichl <hias-vtPv7MOkFPkAvxtiuMwx3w@public.gmane.org>
Date		: 2009-01-28 16:41 (18 days old)
References	: http://marc.info/?l=linux-kernel&m=123316111415677&w=4
Handled-By	: FUJITA Tomonori <fujita.tomonori-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org>
Patch		: http://marc.info/?l=linux-scsi&m=123371501613019&w=2


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12406
Subject		: 2.6.28 thinks that my PS/2 mouse is a touchpad
Submitter	: Alexander E. Patrakov <patrakov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-27 9:06 (50 days old)
References	: http://marc.info/?l=linux-kernel&m=123036893817280&w=4
Handled-By	: Arjan Opmeer <arjan-OssVvNj1wBysTnJN9+BGXg@public.gmane.org>
Patch		: http://marc.info/?l=linux-kernel&m=123092147703236&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12393
Subject		: debugging in dosemu causes lots of 'scheduling while atomic'
Submitter	: Michal Suchanek <hramrach-aRb0bU7PRFPrBKCeMvbIDA@public.gmane.org>
Date		: 2009-01-09 07:28 (37 days old)
Handled-By	: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
Patch		: http://lkml.org/lkml/2009/1/13/445


For details, please visit the bug entries and follow the links given in
references.

As you can see, there is a Bugzilla entry for each of the listed regressions.
There also is a Bugzilla entry used for tracking the regressions introduced
between 2.6.27 and 2.6.28, unresolved as well as resolved, at:

http://bugzilla.kernel.org/show_bug.cgi?id=11808

Please let me know if there are any Bugzilla entries that should be added to
the list in there.

Thanks,
Rafael

[Bug #12061] snd_hda_intel: power_save: sound cracks on powerdown

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12061
Subject		: snd_hda_intel: power_save: sound cracks on powerdown
Submitter	: Jens Weibler <bugzilla-kernel-6hJTtV8wudIr9FUcG+3rRQ@public.gmane.org>
Date		: 2008-11-18 12:07 (89 days old)
Handled-By	: Takashi Iwai <tiwai-l3A5Bk7waGM@public.gmane.org>

[Bug #12209] oldish top core dumps (in its meminfo() function)

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12209
Subject		: oldish top core dumps (in its meminfo() function)
Submitter	: Andreas Mohr <andi-5+Cda9B46AM@public.gmane.org>
Date		: 2008-12-12 18:49 (65 days old)
References	: http://marc.info/?l=linux-kernel&m=122910784006472&w=4
		  http://marc.info/?l=linux-kernel&m=122907511319288&w=4

[Bug #12208] uml is very slow on 2.6.28 host

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
Date		: 2008-12-12 9:35 (65 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4

Re: [Bug #12208] uml is very slow on 2.6.28 host

[Américo Wang]

On Sat, Feb 14, 2009 at 09:50:19PM +0100, Rafael J. Wysocki wrote:
>This message has been generated automatically as a part of a report
>of regressions introduced between 2.6.27 and 2.6.28.
>
>The following bug entry is on the current list of known regressions
>introduced between 2.6.27 and 2.6.28.  Please verify if it still should
>be listed and let me know (either way).
>
>
>Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
>Subject		: uml is very slow on 2.6.28 host
>Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
>Date		: 2008-12-12 9:35 (65 days old)
>References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4

Hello, Miklos!

I can't reproduce this on host 2.6.28.7 with uml guest of current git.
Have you tried 2.6.28.7? Does it have the same problem?

Thanks.


-- 
"Against stupidity, the gods themselves, contend in vain."

Re: [Bug #12208] uml is very slow on 2.6.28 host

[Miklos Szeredi]

On Sun, 22 Feb 2009, =?utf-8?Q?Am=C3=A9rico?= Wang wrote:
> On Sat, Feb 14, 2009 at 09:50:19PM +0100, Rafael J. Wysocki wrote:
> >This message has been generated automatically as a part of a report
> >of regressions introduced between 2.6.27 and 2.6.28.
> >
> >The following bug entry is on the current list of known regressions
> >introduced between 2.6.27 and 2.6.28.  Please verify if it still should
> >be listed and let me know (either way).
> >
> >
> >Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
> >Subject		: uml is very slow on 2.6.28 host
> >Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
> >Date		: 2008-12-12 9:35 (65 days old)
> >References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4
> 
> Hello, Miklos!
> 
> I can't reproduce this on host 2.6.28.7 with uml guest of current git.
> Have you tried 2.6.28.7? Does it have the same problem?

It's still slow for me on 2.6.29-rc5.  I haven't tried 2.6.28.7 yet.

Thanks,
Miklos

[Bug #12160] networking oops after resume from s2ram (2.6.28-rc6)

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12160
Subject		: networking oops after resume from s2ram (2.6.28-rc6)
Submitter	: Marcin Slusarz <marcin.slusarz@gmail.com>
Date		: 2008-11-28 21:15 (79 days old)
References	: http://marc.info/?l=linux-kernel&m=122790701615723&w=4

[Bug #12263] Sata soft reset filling log

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12263
Subject		: Sata soft reset filling log
Submitter	: Justin Madru <bevicm-QP1aEjBt37AFQeE35raUng@public.gmane.org>
Date		: 2008-12-13 2:07 (64 days old)
References	: http://marc.info/?l=linux-kernel&m=122913412608533&w=4

Re: [Bug #12263] Sata soft reset filling log

[Justin Madru]

Rafael J. Wysocki wrote:
> This message has been generated automatically as a part of a report
> of regressions introduced between 2.6.27 and 2.6.28.
>
> The following bug entry is on the current list of known regressions
> introduced between 2.6.27 and 2.6.28.  Please verify if it still should
> be listed and let me know (either way).
>
>
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12263
> Subject		: Sata soft reset filling log
> Submitter	: Justin Madru <bevicm@dslextreme.com>
> Date		: 2008-12-13 2:07 (64 days old)
> References	: http://marc.info/?l=linux-kernel&m=122913412608533&w=4
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
>
>
>
>   

I'm still seeing this on .29-rc5, and I think that my bug #12263 is a 
duplicate of bug #12609,
or more correctly it's a duplicate of mine because I reported first.

It seems like the bug has been fixed in tip/master for some time now.
Below is the diff of origin and tip from when I tested.

$ git diff origin/master..tip/master drivers/ata/

diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index 54961c0..e004c25 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -310,7 +310,7 @@ static struct scsi_host_template piix_sht = {
 };
 
 static struct ata_port_operations piix_pata_ops = {
-    .inherits        = &ata_bmdma32_port_ops,
+    .inherits        = &ata_bmdma_port_ops,
     .cable_detect        = ata_cable_40wire,
     .set_piomode        = piix_set_piomode,
     .set_dmamode        = piix_set_dmamode,
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 9fbf059..1ed3966 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -1482,7 +1482,7 @@ static int ata_hpa_resize(struct ata_device *dev)
     struct ata_eh_context *ehc = &dev->link->eh_context;
     int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
     u64 sectors = ata_id_n_sectors(dev->id);
-    u64 native_sectors;
+    u64 uninitialized_var(native_sectors);
     int rc;
 
     /* do we need to do it? */
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index b9747fa..d65b9b2 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3247,7 +3247,7 @@ void ata_scsi_scan_host(struct ata_port *ap, int sync)
     int tries = 5;
     struct ata_device *last_failed_dev = NULL;
     struct ata_link *link;
-    struct ata_device *dev;
+    struct ata_device *uninitialized_var(dev);
 
     if (ap->flags & ATA_FLAG_DISABLED)
         return;
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 0b299b0..416e3e2 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -80,13 +80,6 @@ const struct ata_port_operations ata_bmdma_port_ops = {
 };
 EXPORT_SYMBOL_GPL(ata_bmdma_port_ops);
 
-const struct ata_port_operations ata_bmdma32_port_ops = {
-    .inherits        = &ata_bmdma_port_ops,
-
-    .sff_data_xfer        = ata_sff_data_xfer32,
-};
-EXPORT_SYMBOL_GPL(ata_bmdma32_port_ops);
-
 /**
  *    ata_fill_sg - Fill PCI IDE PRD table
  *    @qc: Metadata associated with taskfile to be transferred
@@ -743,52 +736,6 @@ unsigned int ata_sff_data_xfer(struct ata_device 
*dev, unsigned char *buf,
 EXPORT_SYMBOL_GPL(ata_sff_data_xfer);
 
 /**
- *    ata_sff_data_xfer32 - Transfer data by PIO
- *    @dev: device to target
- *    @buf: data buffer
- *    @buflen: buffer length
- *    @rw: read/write
- *
- *    Transfer data from/to the device data register by PIO using 32bit
- *    I/O operations.
- *
- *    LOCKING:
- *    Inherited from caller.
- *
- *    RETURNS:
- *    Bytes consumed.
- */
-
-unsigned int ata_sff_data_xfer32(struct ata_device *dev, unsigned char 
*buf,
-                   unsigned int buflen, int rw)
-{
-    struct ata_port *ap = dev->link->ap;
-    void __iomem *data_addr = ap->ioaddr.data_addr;
-    unsigned int words = buflen >> 2;
-    int slop = buflen & 3;
-
-    /* Transfer multiple of 4 bytes */
-    if (rw == READ)
-        ioread32_rep(data_addr, buf, words);
-    else
-        iowrite32_rep(data_addr, buf, words);
-
-    if (unlikely(slop)) {
-        __le32 pad;
-        if (rw == READ) {
-            pad = cpu_to_le32(ioread32(ap->ioaddr.data_addr));
-            memcpy(buf + buflen - slop, &pad, slop);
-        } else {
-            memcpy(&pad, buf + buflen - slop, slop);
-            iowrite32(le32_to_cpu(pad), ap->ioaddr.data_addr);
-        }
-        words++;
-    }
-    return words << 2;
-}
-EXPORT_SYMBOL_GPL(ata_sff_data_xfer32);
-
-/**
  *    ata_sff_data_xfer_noirq - Transfer data by PIO
  *    @dev: device to target
  *    @buf: data buffer
diff --git a/drivers/ata/pata_ali.c b/drivers/ata/pata_ali.c
index eb99dbe..7cd48ea 100644
--- a/drivers/ata/pata_ali.c
+++ b/drivers/ata/pata_ali.c
@@ -151,7 +151,8 @@ static void ali_fifo_control(struct ata_port *ap, 
struct ata_device *adev, int o
 
     pci_read_config_byte(pdev, pio_fifo, &fifo);
     fifo &= ~(0x0F << shift);
-    fifo |= (on << shift);
+    if (on)
+        fifo |= (on << shift);
     pci_write_config_byte(pdev, pio_fifo, fifo);
 }
 
@@ -369,11 +370,10 @@ static struct ata_port_operations 
ali_early_port_ops = {
     .inherits    = &ata_sff_port_ops,
     .cable_detect    = ata_cable_40wire,
     .set_piomode    = ali_set_piomode,
-    .sff_data_xfer  = ata_sff_data_xfer32,
 };
 
 static const struct ata_port_operations ali_dma_base_ops = {
-    .inherits    = &ata_bmdma32_port_ops,
+    .inherits    = &ata_bmdma_port_ops,
     .set_piomode    = ali_set_piomode,
     .set_dmamode    = ali_set_dmamode,
 };
diff --git a/drivers/ata/pata_amd.c b/drivers/ata/pata_amd.c
index 63719ab..0ec9c7d 100644
--- a/drivers/ata/pata_amd.c
+++ b/drivers/ata/pata_amd.c
@@ -24,7 +24,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME "pata_amd"
-#define DRV_VERSION "0.3.11"
+#define DRV_VERSION "0.3.10"
 
 /**
  *    timing_setup        -    shared timing computation and load
@@ -345,7 +345,7 @@ static struct scsi_host_template amd_sht = {
 };
 
 static const struct ata_port_operations amd_base_port_ops = {
-    .inherits    = &ata_bmdma32_port_ops,
+    .inherits    = &ata_bmdma_port_ops,
     .prereset    = amd_pre_reset,
 };
 
diff --git a/drivers/ata/pata_atiixp.c b/drivers/ata/pata_atiixp.c
index 506adde..115eb00 100644
--- a/drivers/ata/pata_atiixp.c
+++ b/drivers/ata/pata_atiixp.c
@@ -140,7 +140,7 @@ static void atiixp_set_dmamode(struct ata_port *ap, 
struct ata_device *adev)
         wanted_pio = 3;
     else if (adev->dma_mode == XFER_MW_DMA_0)
         wanted_pio = 0;
-    else BUG();
+    else panic("atiixp_set_dmamode: unknown DMA mode!");
 
     if (adev->pio_mode != wanted_pio)
         atiixp_set_pio_timing(ap, adev, wanted_pio);
diff --git a/drivers/ata/pata_mpiix.c b/drivers/ata/pata_mpiix.c
index aa576ca..7c8faa4 100644
--- a/drivers/ata/pata_mpiix.c
+++ b/drivers/ata/pata_mpiix.c
@@ -35,7 +35,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME "pata_mpiix"
-#define DRV_VERSION "0.7.7"
+#define DRV_VERSION "0.7.6"
 
 enum {
     IDETIM = 0x6C,        /* IDE control register */
@@ -146,7 +146,6 @@ static struct ata_port_operations mpiix_port_ops = {
     .cable_detect    = ata_cable_40wire,
     .set_piomode    = mpiix_set_piomode,
     .prereset    = mpiix_pre_reset,
-    .sff_data_xfer    = ata_sff_data_xfer32,
 };
 
 static int mpiix_init_one(struct pci_dev *dev, const struct 
pci_device_id *id)
diff --git a/drivers/ata/pata_sil680.c b/drivers/ata/pata_sil680.c
index 9e764e5..83580a5 100644
--- a/drivers/ata/pata_sil680.c
+++ b/drivers/ata/pata_sil680.c
@@ -32,7 +32,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME "pata_sil680"
-#define DRV_VERSION "0.4.9"
+#define DRV_VERSION "0.4.8"
 
 #define SIL680_MMIO_BAR        5
 
@@ -195,7 +195,7 @@ static struct scsi_host_template sil680_sht = {
 };
 
 static struct ata_port_operations sil680_port_ops = {
-    .inherits    = &ata_bmdma32_port_ops,
+    .inherits    = &ata_bmdma_port_ops,
     .cable_detect    = sil680_cable_detect,
     .set_piomode    = sil680_set_piomode,
     .set_dmamode    = sil680_set_dmamode,
diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c
index 5c62da9..f9803a2 100644
--- a/drivers/ata/sata_via.c
+++ b/drivers/ata/sata_via.c
@@ -566,7 +566,7 @@ static int svia_init_one(struct pci_dev *pdev, const 
struct pci_device_id *ent)
     static int printed_version;
     unsigned int i;
     int rc;
-    struct ata_host *host;
+    struct ata_host *uninitialized_var(host);
     int board_id = (int) ent->driver_data;
     const unsigned *bar_sizes;
 
Justin Madru

Re: [Bug #12263] Sata soft reset filling log

[Rafael J. Wysocki]

On Sunday 15 February 2009, Justin Madru wrote:
> Rafael J. Wysocki wrote:
> > This message has been generated automatically as a part of a report
> > of regressions introduced between 2.6.27 and 2.6.28.
> >
> > The following bug entry is on the current list of known regressions
> > introduced between 2.6.27 and 2.6.28.  Please verify if it still should
> > be listed and let me know (either way).
> >
> >
> > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12263
> > Subject		: Sata soft reset filling log
> > Submitter	: Justin Madru <bevicm@dslextreme.com>
> > Date		: 2008-12-13 2:07 (64 days old)
> > References	: http://marc.info/?l=linux-kernel&m=122913412608533&w=4
> 
> I'm still seeing this on .29-rc5, and I think that my bug #12263 is a 
> duplicate of bug #12609,
> or more correctly it's a duplicate of mine because I reported first.
> 
> It seems like the bug has been fixed in tip/master for some time now.
> Below is the diff of origin and tip from when I tested.

Ingo, do you know whinch patch in -tip fixes this regression?

> $ git diff origin/master..tip/master drivers/ata/
> 
> diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
> index 54961c0..e004c25 100644
> --- a/drivers/ata/ata_piix.c
> +++ b/drivers/ata/ata_piix.c
> @@ -310,7 +310,7 @@ static struct scsi_host_template piix_sht = {
>  };
>  
>  static struct ata_port_operations piix_pata_ops = {
> -    .inherits        = &ata_bmdma32_port_ops,
> +    .inherits        = &ata_bmdma_port_ops,
>      .cable_detect        = ata_cable_40wire,
>      .set_piomode        = piix_set_piomode,
>      .set_dmamode        = piix_set_dmamode,
> diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
> index 9fbf059..1ed3966 100644
> --- a/drivers/ata/libata-core.c
> +++ b/drivers/ata/libata-core.c
> @@ -1482,7 +1482,7 @@ static int ata_hpa_resize(struct ata_device *dev)
>      struct ata_eh_context *ehc = &dev->link->eh_context;
>      int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
>      u64 sectors = ata_id_n_sectors(dev->id);
> -    u64 native_sectors;
> +    u64 uninitialized_var(native_sectors);
>      int rc;
>  
>      /* do we need to do it? */
> diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
> index b9747fa..d65b9b2 100644
> --- a/drivers/ata/libata-scsi.c
> +++ b/drivers/ata/libata-scsi.c
> @@ -3247,7 +3247,7 @@ void ata_scsi_scan_host(struct ata_port *ap, int sync)
>      int tries = 5;
>      struct ata_device *last_failed_dev = NULL;
>      struct ata_link *link;
> -    struct ata_device *dev;
> +    struct ata_device *uninitialized_var(dev);
>  
>      if (ap->flags & ATA_FLAG_DISABLED)
>          return;
> diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
> index 0b299b0..416e3e2 100644
> --- a/drivers/ata/libata-sff.c
> +++ b/drivers/ata/libata-sff.c
> @@ -80,13 +80,6 @@ const struct ata_port_operations ata_bmdma_port_ops = {
>  };
>  EXPORT_SYMBOL_GPL(ata_bmdma_port_ops);
>  
> -const struct ata_port_operations ata_bmdma32_port_ops = {
> -    .inherits        = &ata_bmdma_port_ops,
> -
> -    .sff_data_xfer        = ata_sff_data_xfer32,
> -};
> -EXPORT_SYMBOL_GPL(ata_bmdma32_port_ops);
> -
>  /**
>   *    ata_fill_sg - Fill PCI IDE PRD table
>   *    @qc: Metadata associated with taskfile to be transferred
> @@ -743,52 +736,6 @@ unsigned int ata_sff_data_xfer(struct ata_device 
> *dev, unsigned char *buf,
>  EXPORT_SYMBOL_GPL(ata_sff_data_xfer);
>  
>  /**
> - *    ata_sff_data_xfer32 - Transfer data by PIO
> - *    @dev: device to target
> - *    @buf: data buffer
> - *    @buflen: buffer length
> - *    @rw: read/write
> - *
> - *    Transfer data from/to the device data register by PIO using 32bit
> - *    I/O operations.
> - *
> - *    LOCKING:
> - *    Inherited from caller.
> - *
> - *    RETURNS:
> - *    Bytes consumed.
> - */
> -
> -unsigned int ata_sff_data_xfer32(struct ata_device *dev, unsigned char 
> *buf,
> -                   unsigned int buflen, int rw)
> -{
> -    struct ata_port *ap = dev->link->ap;
> -    void __iomem *data_addr = ap->ioaddr.data_addr;
> -    unsigned int words = buflen >> 2;
> -    int slop = buflen & 3;
> -
> -    /* Transfer multiple of 4 bytes */
> -    if (rw == READ)
> -        ioread32_rep(data_addr, buf, words);
> -    else
> -        iowrite32_rep(data_addr, buf, words);
> -
> -    if (unlikely(slop)) {
> -        __le32 pad;
> -        if (rw == READ) {
> -            pad = cpu_to_le32(ioread32(ap->ioaddr.data_addr));
> -            memcpy(buf + buflen - slop, &pad, slop);
> -        } else {
> -            memcpy(&pad, buf + buflen - slop, slop);
> -            iowrite32(le32_to_cpu(pad), ap->ioaddr.data_addr);
> -        }
> -        words++;
> -    }
> -    return words << 2;
> -}
> -EXPORT_SYMBOL_GPL(ata_sff_data_xfer32);
> -
> -/**
>   *    ata_sff_data_xfer_noirq - Transfer data by PIO
>   *    @dev: device to target
>   *    @buf: data buffer
> diff --git a/drivers/ata/pata_ali.c b/drivers/ata/pata_ali.c
> index eb99dbe..7cd48ea 100644
> --- a/drivers/ata/pata_ali.c
> +++ b/drivers/ata/pata_ali.c
> @@ -151,7 +151,8 @@ static void ali_fifo_control(struct ata_port *ap, 
> struct ata_device *adev, int o
>  
>      pci_read_config_byte(pdev, pio_fifo, &fifo);
>      fifo &= ~(0x0F << shift);
> -    fifo |= (on << shift);
> +    if (on)
> +        fifo |= (on << shift);
>      pci_write_config_byte(pdev, pio_fifo, fifo);
>  }
>  
> @@ -369,11 +370,10 @@ static struct ata_port_operations 
> ali_early_port_ops = {
>      .inherits    = &ata_sff_port_ops,
>      .cable_detect    = ata_cable_40wire,
>      .set_piomode    = ali_set_piomode,
> -    .sff_data_xfer  = ata_sff_data_xfer32,
>  };
>  
>  static const struct ata_port_operations ali_dma_base_ops = {
> -    .inherits    = &ata_bmdma32_port_ops,
> +    .inherits    = &ata_bmdma_port_ops,
>      .set_piomode    = ali_set_piomode,
>      .set_dmamode    = ali_set_dmamode,
>  };
> diff --git a/drivers/ata/pata_amd.c b/drivers/ata/pata_amd.c
> index 63719ab..0ec9c7d 100644
> --- a/drivers/ata/pata_amd.c
> +++ b/drivers/ata/pata_amd.c
> @@ -24,7 +24,7 @@
>  #include <linux/libata.h>
>  
>  #define DRV_NAME "pata_amd"
> -#define DRV_VERSION "0.3.11"
> +#define DRV_VERSION "0.3.10"
>  
>  /**
>   *    timing_setup        -    shared timing computation and load
> @@ -345,7 +345,7 @@ static struct scsi_host_template amd_sht = {
>  };
>  
>  static const struct ata_port_operations amd_base_port_ops = {
> -    .inherits    = &ata_bmdma32_port_ops,
> +    .inherits    = &ata_bmdma_port_ops,
>      .prereset    = amd_pre_reset,
>  };
>  
> diff --git a/drivers/ata/pata_atiixp.c b/drivers/ata/pata_atiixp.c
> index 506adde..115eb00 100644
> --- a/drivers/ata/pata_atiixp.c
> +++ b/drivers/ata/pata_atiixp.c
> @@ -140,7 +140,7 @@ static void atiixp_set_dmamode(struct ata_port *ap, 
> struct ata_device *adev)
>          wanted_pio = 3;
>      else if (adev->dma_mode == XFER_MW_DMA_0)
>          wanted_pio = 0;
> -    else BUG();
> +    else panic("atiixp_set_dmamode: unknown DMA mode!");
>  
>      if (adev->pio_mode != wanted_pio)
>          atiixp_set_pio_timing(ap, adev, wanted_pio);
> diff --git a/drivers/ata/pata_mpiix.c b/drivers/ata/pata_mpiix.c
> index aa576ca..7c8faa4 100644
> --- a/drivers/ata/pata_mpiix.c
> +++ b/drivers/ata/pata_mpiix.c
> @@ -35,7 +35,7 @@
>  #include <linux/libata.h>
>  
>  #define DRV_NAME "pata_mpiix"
> -#define DRV_VERSION "0.7.7"
> +#define DRV_VERSION "0.7.6"
>  
>  enum {
>      IDETIM = 0x6C,        /* IDE control register */
> @@ -146,7 +146,6 @@ static struct ata_port_operations mpiix_port_ops = {
>      .cable_detect    = ata_cable_40wire,
>      .set_piomode    = mpiix_set_piomode,
>      .prereset    = mpiix_pre_reset,
> -    .sff_data_xfer    = ata_sff_data_xfer32,
>  };
>  
>  static int mpiix_init_one(struct pci_dev *dev, const struct 
> pci_device_id *id)
> diff --git a/drivers/ata/pata_sil680.c b/drivers/ata/pata_sil680.c
> index 9e764e5..83580a5 100644
> --- a/drivers/ata/pata_sil680.c
> +++ b/drivers/ata/pata_sil680.c
> @@ -32,7 +32,7 @@
>  #include <linux/libata.h>
>  
>  #define DRV_NAME "pata_sil680"
> -#define DRV_VERSION "0.4.9"
> +#define DRV_VERSION "0.4.8"
>  
>  #define SIL680_MMIO_BAR        5
>  
> @@ -195,7 +195,7 @@ static struct scsi_host_template sil680_sht = {
>  };
>  
>  static struct ata_port_operations sil680_port_ops = {
> -    .inherits    = &ata_bmdma32_port_ops,
> +    .inherits    = &ata_bmdma_port_ops,
>      .cable_detect    = sil680_cable_detect,
>      .set_piomode    = sil680_set_piomode,
>      .set_dmamode    = sil680_set_dmamode,
> diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c
> index 5c62da9..f9803a2 100644
> --- a/drivers/ata/sata_via.c
> +++ b/drivers/ata/sata_via.c
> @@ -566,7 +566,7 @@ static int svia_init_one(struct pci_dev *pdev, const 
> struct pci_device_id *ent)
>      static int printed_version;
>      unsigned int i;
>      int rc;
> -    struct ata_host *host;
> +    struct ata_host *uninitialized_var(host);
>      int board_id = (int) ent->driver_data;
>      const unsigned *bar_sizes;
>  
> Justin Madru

Re: [Bug #12263] Sata soft reset filling log

[Ingo Molnar]

* Rafael J. Wysocki <rjw@sisk.pl> wrote:

> On Sunday 15 February 2009, Justin Madru wrote:
> > Rafael J. Wysocki wrote:
> > > This message has been generated automatically as a part of a report
> > > of regressions introduced between 2.6.27 and 2.6.28.
> > >
> > > The following bug entry is on the current list of known regressions
> > > introduced between 2.6.27 and 2.6.28.  Please verify if it still should
> > > be listed and let me know (either way).
> > >
> > >
> > > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12263
> > > Subject		: Sata soft reset filling log
> > > Submitter	: Justin Madru <bevicm@dslextreme.com>
> > > Date		: 2008-12-13 2:07 (64 days old)
> > > References	: http://marc.info/?l=linux-kernel&m=122913412608533&w=4
> > 
> > I'm still seeing this on .29-rc5, and I think that my bug #12263 is a 
> > duplicate of bug #12609,
> > or more correctly it's a duplicate of mine because I reported first.
> > 
> > It seems like the bug has been fixed in tip/master for some time now.
> > Below is the diff of origin and tip from when I tested.
> 
> Ingo, do you know whinch patch in -tip fixes this regression?

This one, done on Jan 10, more than a month ago:

  f1d26da: Revert "libata: Add 32bit PIO support"

When a commit causes trouble in -tip qa i immediately revert it in 95% 
of the cases, no questions asked. Especially if it's related to 
persistent storage.

	Ingo

Re: [Bug #12263] Sata soft reset filling log

[Rafael J. Wysocki]

On Sunday 15 February 2009, Ingo Molnar wrote:
> 
> * Rafael J. Wysocki <rjw@sisk.pl> wrote:
> 
> > On Sunday 15 February 2009, Justin Madru wrote:
> > > Rafael J. Wysocki wrote:
> > > > This message has been generated automatically as a part of a report
> > > > of regressions introduced between 2.6.27 and 2.6.28.
> > > >
> > > > The following bug entry is on the current list of known regressions
> > > > introduced between 2.6.27 and 2.6.28.  Please verify if it still should
> > > > be listed and let me know (either way).
> > > >
> > > >
> > > > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12263
> > > > Subject		: Sata soft reset filling log
> > > > Submitter	: Justin Madru <bevicm@dslextreme.com>
> > > > Date		: 2008-12-13 2:07 (64 days old)
> > > > References	: http://marc.info/?l=linux-kernel&m=122913412608533&w=4
> > > 
> > > I'm still seeing this on .29-rc5, and I think that my bug #12263 is a 
> > > duplicate of bug #12609,
> > > or more correctly it's a duplicate of mine because I reported first.
> > > 
> > > It seems like the bug has been fixed in tip/master for some time now.
> > > Below is the diff of origin and tip from when I tested.
> > 
> > Ingo, do you know whinch patch in -tip fixes this regression?
> 
> This one, done on Jan 10, more than a month ago:
> 
>   f1d26da: Revert "libata: Add 32bit PIO support"
> 
> When a commit causes trouble in -tip qa i immediately revert it in 95% 
> of the cases, no questions asked. Especially if it's related to 
> persistent storage.

OK, thanks.

We seem to have a working fix patch for this issue in bug #12609.

Best,
Rafael

Re: [Bug #12263] Sata soft reset filling log

[Sergei Shtylyov]

Hello.

Rafael J. Wysocki wrote:

>>>>>This message has been generated automatically as a part of a report
>>>>>of regressions introduced between 2.6.27 and 2.6.28.

>>>>>The following bug entry is on the current list of known regressions
>>>>>introduced between 2.6.27 and 2.6.28.  Please verify if it still should
>>>>>be listed and let me know (either way).

>>>>>Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12263
>>>>>Subject		: Sata soft reset filling log
>>>>>Submitter	: Justin Madru <bevicm@dslextreme.com>
>>>>>Date		: 2008-12-13 2:07 (64 days old)
>>>>>References	: http://marc.info/?l=linux-kernel&m=122913412608533&w=4

>>>>I'm still seeing this on .29-rc5, and I think that my bug #12263 is a 
>>>>duplicate of bug #12609,
>>>>or more correctly it's a duplicate of mine because I reported first.

>>>>It seems like the bug has been fixed in tip/master for some time now.
>>>>Below is the diff of origin and tip from when I tested.

>>>Ingo, do you know whinch patch in -tip fixes this regression?

>>This one, done on Jan 10, more than a month ago:

>>  f1d26da: Revert "libata: Add 32bit PIO support"

>>When a commit causes trouble in -tip qa i immediately revert it in 95% 
>>of the cases, no questions asked. Especially if it's related to 
>>persistent storage.

> OK, thanks.

> We seem to have a working fix patch for this issue in bug #12609.

    Wait, if this is indeed post-2.6.27 regression, it couldn't possibly have 
been caused by that patch which got merged during 2.6.29-rc1 timeframe. 
Something's up with this bug...

MBR, Sergei

Re: [Bug #12263] Sata soft reset filling log

[Ingo Molnar]

* Sergei Shtylyov <sshtylyov@ru.mvista.com> wrote:

> Hello.
>
> Rafael J. Wysocki wrote:
>
>>>>>> This message has been generated automatically as a part of a report
>>>>>> of regressions introduced between 2.6.27 and 2.6.28.
>
>>>>>> The following bug entry is on the current list of known regressions
>>>>>> introduced between 2.6.27 and 2.6.28.  Please verify if it still should
>>>>>> be listed and let me know (either way).
>
>>>>>> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12263
>>>>>> Subject		: Sata soft reset filling log
>>>>>> Submitter	: Justin Madru <bevicm@dslextreme.com>
>>>>>> Date		: 2008-12-13 2:07 (64 days old)
>>>>>> References	: http://marc.info/?l=linux-kernel&m=122913412608533&w=4
>
>>>>> I'm still seeing this on .29-rc5, and I think that my bug #12263 
>>>>> is a duplicate of bug #12609,
>>>>> or more correctly it's a duplicate of mine because I reported first.
>
>>>>> It seems like the bug has been fixed in tip/master for some time now.
>>>>> Below is the diff of origin and tip from when I tested.
>
>>>> Ingo, do you know whinch patch in -tip fixes this regression?
>
>>> This one, done on Jan 10, more than a month ago:
>
>>>  f1d26da: Revert "libata: Add 32bit PIO support"
>
>>> When a commit causes trouble in -tip qa i immediately revert it in 
>>> 95% of the cases, no questions asked. Especially if it's related to  
>>> persistent storage.
>
>> OK, thanks.
>
>> We seem to have a working fix patch for this issue in bug #12609.
>
>    Wait, if this is indeed post-2.6.27 regression, it couldn't possibly 
> have been caused by that patch which got merged during 2.6.29-rc1 
> timeframe. Something's up with this bug...

SATA uses the SCSI layer, right? It could then perhaps be these bits in 
tip:out-of-tree:

 813104e: Revert "[SCSI] simplify scsi_io_completion()"
 84db545: Revert "[SCSI] Fix uninitialized variable error in scsi_io_completion"
 0eb6038: Revert "[SCSI] Fix error handling for DIF/DIX"
 3cd94dd: Revert "[SCSI] scsi_lib: don't decrement busy counters when inserting commands"
 c27aed5: Revert "[SCSI] scsi_lib: fix DID_RESET status problems"

i needed these to keep an aic7xxx box from crashing. This regression got 
introduced at around 2.6.28-rc1, so it fits the timeframe.

	Ingo

Re: [Bug #12263] Sata soft reset filling log

[Sergei Shtylyov]

Hello, I wrote:

>>>>>> This message has been generated automatically as a part of a report
>>>>>> of regressions introduced between 2.6.27 and 2.6.28.

>>>>>> The following bug entry is on the current list of known regressions
>>>>>> introduced between 2.6.27 and 2.6.28.  Please verify if it still 
>>>>>> should
>>>>>> be listed and let me know (either way).

>>>>>> Bug-Entry    : http://bugzilla.kernel.org/show_bug.cgi?id=12263
>>>>>> Subject        : Sata soft reset filling log
>>>>>> Submitter    : Justin Madru <bevicm-QP1aEjBt37AFQeE35raUng@public.gmane.org>
>>>>>> Date        : 2008-12-13 2:07 (64 days old)
>>>>>> References    : 
>>>>>> http://marc.info/?l=linux-kernel&m=122913412608533&w=4

>>>>> I'm still seeing this on .29-rc5, and I think that my bug #12263 is 
>>>>> a duplicate of bug #12609,
>>>>> or more correctly it's a duplicate of mine because I reported first.

>>>>> It seems like the bug has been fixed in tip/master for some time now.
>>>>> Below is the diff of origin and tip from when I tested.

>>>> Ingo, do you know whinch patch in -tip fixes this regression?

>>> This one, done on Jan 10, more than a month ago:

>>>  f1d26da: Revert "libata: Add 32bit PIO support"

>>> When a commit causes trouble in -tip qa i immediately revert it in 
>>> 95% of the cases, no questions asked. Especially if it's related to 
>>> persistent storage.

>> OK, thanks.

>> We seem to have a working fix patch for this issue in bug #12609.

>    Wait, if this is indeed post-2.6.27 regression, it couldn't possibly 
> have been caused by that patch which got merged during 2.6.29-rc1 
> timeframe. Something's up with this bug...

    Also, it's been reported for a hard disk while regression in bug 12609 
only hits the ATAPI devices. I think that bug 12263 needs to be reopened.

MBR, Sergei

Re: [Bug #12263] Sata soft reset filling log

[Sergei Shtylyov]

Hello, I wrote:

>>>>>>> This message has been generated automatically as a part of a report
>>>>>>> of regressions introduced between 2.6.27 and 2.6.28.

>>>>>>> The following bug entry is on the current list of known regressions
>>>>>>> introduced between 2.6.27 and 2.6.28.  Please verify if it still 
>>>>>>> should
>>>>>>> be listed and let me know (either way).

>>>>>>> Bug-Entry    : http://bugzilla.kernel.org/show_bug.cgi?id=12263
>>>>>>> Subject        : Sata soft reset filling log
>>>>>>> Submitter    : Justin Madru <bevicm-QP1aEjBt37AFQeE35raUng@public.gmane.org>
>>>>>>> Date        : 2008-12-13 2:07 (64 days old)
>>>>>>> References    : 
>>>>>>> http://marc.info/?l=linux-kernel&m=122913412608533&w=4

>>>>>> I'm still seeing this on .29-rc5, and I think that my bug #12263 
>>>>>> is a duplicate of bug #12609,
>>>>>> or more correctly it's a duplicate of mine because I reported first.

>>>>>> It seems like the bug has been fixed in tip/master for some time now.
>>>>>> Below is the diff of origin and tip from when I tested.

>>>>> Ingo, do you know whinch patch in -tip fixes this regression?

>>>> This one, done on Jan 10, more than a month ago:

>>>>  f1d26da: Revert "libata: Add 32bit PIO support"

>>>> When a commit causes trouble in -tip qa i immediately revert it in 
>>>> 95% of the cases, no questions asked. Especially if it's related to 
>>>> persistent storage.

>>> OK, thanks.

>>> We seem to have a working fix patch for this issue in bug #12609.

>>    Wait, if this is indeed post-2.6.27 regression, it couldn't 
>> possibly have been caused by that patch which got merged during 
>> 2.6.29-rc1 timeframe. Something's up with this bug...

>    Also, it's been reported for a hard disk while regression in bug 
> 12609 only hits the ATAPI devices.  I think that bug 12263 needs to be reopened.

    After referring to the SCSI command codes "cdb 0x1e" means ALLOW MEDIUM 
REMOVAL command -- which could hardly be addressed to an usual hard disk. So, 
it looks like we had a case of the confused bug report which has a lot of info 
on the hard disk while errors were most probably happening with a CD/DVD 
drive. :-)

MBR, Sergei

Re: [Bug #12263] Sata soft reset filling log

[Justin Madru]

Sergei Shtylyov wrote:

> After referring to the SCSI command codes "cdb 0x1e" means ALLOW MEDIUM REMOVAL command -- which
> could hardly be addressed to an usual hard disk. So, it looks like we had a case of the confused bug report which
> has a lot of info on the hard disk while errors were most probably happening with a CD/DVD drive.
Yes, I originally thought it was my hard disk because the kernel logs showed ata2.

But, Tejun Heo figured out it was my DVD drive (ATAPI) that was on the ata2 link.

(see http://marc.info/?l=linux-kernel&m=122993014109646&w=2)

I tried to bisect it, but around .28-rc1 I began to get numerous compile errors, so couldn't continue.

I also tried patches that Tejun sent me, but non of them worked, it just slightly change the error message.

So, yes this is a regression that was introduced in the .28 merge window, and I still think that bug #12609 is a duplicate of my bug.

I don't see this bug on tip/master and this is the diff of origin and tip at the time I tested.

$ git diff origin/master..tip/master drivers/ata/

diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c

index 54961c0..e004c25 100644

--- a/drivers/ata/ata_piix.c

+++ b/drivers/ata/ata_piix.c

@@ -310,7 +310,7 @@ static struct scsi_host_template piix_sht = {

};

static struct ata_port_operations piix_pata_ops = {

-    .inherits        = &ata_bmdma32_port_ops,

+    .inherits        = &ata_bmdma_port_ops,

    .cable_detect        = ata_cable_40wire,

    .set_piomode        = piix_set_piomode,

    .set_dmamode        = piix_set_dmamode,

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c

index 9fbf059..1ed3966 100644

--- a/drivers/ata/libata-core.c

+++ b/drivers/ata/libata-core.c

@@ -1482,7 +1482,7 @@ static int ata_hpa_resize(struct ata_device *dev)

    struct ata_eh_context *ehc = &dev->link->eh_context;

    int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;

    u64 sectors = ata_id_n_sectors(dev->id);

-    u64 native_sectors;

+    u64 uninitialized_var(native_sectors);

    int rc;

    /* do we need to do it? */

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c

index b9747fa..d65b9b2 100644

--- a/drivers/ata/libata-scsi.c

+++ b/drivers/ata/libata-scsi.c

@@ -3247,7 +3247,7 @@ void ata_scsi_scan_host(struct ata_port *ap, int sync)

    int tries = 5;

    struct ata_device *last_failed_dev = NULL;

    struct ata_link *link;

-    struct ata_device *dev;

+    struct ata_device *uninitialized_var(dev);

    if (ap->flags & ATA_FLAG_DISABLED)

        return;

diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c

index 0b299b0..416e3e2 100644

--- a/drivers/ata/libata-sff.c

+++ b/drivers/ata/libata-sff.c

@@ -80,13 +80,6 @@ const struct ata_port_operations ata_bmdma_port_ops = {

};

EXPORT_SYMBOL_GPL(ata_bmdma_port_ops);

-const struct ata_port_operations ata_bmdma32_port_ops = {

-    .inherits        = &ata_bmdma_port_ops,

-

-    .sff_data_xfer        = ata_sff_data_xfer32,

-};

-EXPORT_SYMBOL_GPL(ata_bmdma32_port_ops);

-

/**

 *    ata_fill_sg - Fill PCI IDE PRD table

 *    @qc: Metadata associated with taskfile to be transferred

@@ -743,52 +736,6 @@ unsigned int ata_sff_data_xfer(struct ata_device *dev, unsigned char *buf,

EXPORT_SYMBOL_GPL(ata_sff_data_xfer);

/**

- *    ata_sff_data_xfer32 - Transfer data by PIO

- *    @dev: device to target

- *    @buf: data buffer

- *    @buflen: buffer length

- *    @rw: read/write

- *

- *    Transfer data from/to the device data register by PIO using 32bit

- *    I/O operations.

- *

- *    LOCKING:

- *    Inherited from caller.

- *

- *    RETURNS:

- *    Bytes consumed.

- */

-

-unsigned int ata_sff_data_xfer32(struct ata_device *dev, unsigned char *buf,

-                   unsigned int buflen, int rw)

-{

-    struct ata_port *ap = dev->link->ap;

-    void __iomem *data_addr = ap->ioaddr.data_addr;

-    unsigned int words = buflen >> 2;

-    int slop = buflen & 3;

-

-    /* Transfer multiple of 4 bytes */

-    if (rw == READ)

-        ioread32_rep(data_addr, buf, words);

-    else

-        iowrite32_rep(data_addr, buf, words);

-

-    if (unlikely(slop)) {

-        __le32 pad;

-        if (rw == READ) {

-            pad = cpu_to_le32(ioread32(ap->ioaddr.data_addr));

-            memcpy(buf + buflen - slop, &pad, slop);

-        } else {

-            memcpy(&pad, buf + buflen - slop, slop);

-            iowrite32(le32_to_cpu(pad), ap->ioaddr.data_addr);

-        }

-        words++;

-    }

-    return words << 2;

-}

-EXPORT_SYMBOL_GPL(ata_sff_data_xfer32);

-

-/**

 *    ata_sff_data_xfer_noirq - Transfer data by PIO

 *    @dev: device to target

 *    @buf: data buffer

diff --git a/drivers/ata/pata_ali.c b/drivers/ata/pata_ali.c

index eb99dbe..7cd48ea 100644

--- a/drivers/ata/pata_ali.c

+++ b/drivers/ata/pata_ali.c

@@ -151,7 +151,8 @@ static void ali_fifo_control(struct ata_port *ap, struct ata_device *adev, int o

    pci_read_config_byte(pdev, pio_fifo, &fifo);

    fifo &= ~(0x0F << shift);

-    fifo |= (on << shift);

+    if (on)

+        fifo |= (on << shift);

    pci_write_config_byte(pdev, pio_fifo, fifo);

}

@@ -369,11 +370,10 @@ static struct ata_port_operations ali_early_port_ops = {

    .inherits    = &ata_sff_port_ops,

    .cable_detect    = ata_cable_40wire,

    .set_piomode    = ali_set_piomode,

-    .sff_data_xfer  = ata_sff_data_xfer32,

};

static const struct ata_port_operations ali_dma_base_ops = {

-    .inherits    = &ata_bmdma32_port_ops,

+    .inherits    = &ata_bmdma_port_ops,

    .set_piomode    = ali_set_piomode,

    .set_dmamode    = ali_set_dmamode,

};

diff --git a/drivers/ata/pata_amd.c b/drivers/ata/pata_amd.c

index 63719ab..0ec9c7d 100644

--- a/drivers/ata/pata_amd.c

+++ b/drivers/ata/pata_amd.c

@@ -24,7 +24,7 @@

#include <linux/libata.h>

#define DRV_NAME "pata_amd"

-#define DRV_VERSION "0.3.11"

+#define DRV_VERSION "0.3.10"

/**

 *    timing_setup        -    shared timing computation and load

@@ -345,7 +345,7 @@ static struct scsi_host_template amd_sht = {

};

static const struct ata_port_operations amd_base_port_ops = {

-    .inherits    = &ata_bmdma32_port_ops,

+    .inherits    = &ata_bmdma_port_ops,

    .prereset    = amd_pre_reset,

};

diff --git a/drivers/ata/pata_atiixp.c b/drivers/ata/pata_atiixp.c

index 506adde..115eb00 100644

--- a/drivers/ata/pata_atiixp.c

+++ b/drivers/ata/pata_atiixp.c

@@ -140,7 +140,7 @@ static void atiixp_set_dmamode(struct ata_port *ap, struct ata_device *adev)

        wanted_pio = 3;

    else if (adev->dma_mode == XFER_MW_DMA_0)

        wanted_pio = 0;

-    else BUG();

+    else panic("atiixp_set_dmamode: unknown DMA mode!");

    if (adev->pio_mode != wanted_pio)

        atiixp_set_pio_timing(ap, adev, wanted_pio);

diff --git a/drivers/ata/pata_mpiix.c b/drivers/ata/pata_mpiix.c

index aa576ca..7c8faa4 100644

--- a/drivers/ata/pata_mpiix.c

+++ b/drivers/ata/pata_mpiix.c

@@ -35,7 +35,7 @@

#include <linux/libata.h>

#define DRV_NAME "pata_mpiix"

-#define DRV_VERSION "0.7.7"

+#define DRV_VERSION "0.7.6"

enum {

    IDETIM = 0x6C,        /* IDE control register */

@@ -146,7 +146,6 @@ static struct ata_port_operations mpiix_port_ops = {

    .cable_detect    = ata_cable_40wire,

    .set_piomode    = mpiix_set_piomode,

    .prereset    = mpiix_pre_reset,

-    .sff_data_xfer    = ata_sff_data_xfer32,

};

static int mpiix_init_one(struct pci_dev *dev, const struct pci_device_id *id)

diff --git a/drivers/ata/pata_sil680.c b/drivers/ata/pata_sil680.c

index 9e764e5..83580a5 100644

--- a/drivers/ata/pata_sil680.c

+++ b/drivers/ata/pata_sil680.c

@@ -32,7 +32,7 @@

#include <linux/libata.h>

#define DRV_NAME "pata_sil680"

-#define DRV_VERSION "0.4.9"

+#define DRV_VERSION "0.4.8"

#define SIL680_MMIO_BAR        5

@@ -195,7 +195,7 @@ static struct scsi_host_template sil680_sht = {

};

static struct ata_port_operations sil680_port_ops = {

-    .inherits    = &ata_bmdma32_port_ops,

+    .inherits    = &ata_bmdma_port_ops,

    .cable_detect    = sil680_cable_detect,

    .set_piomode    = sil680_set_piomode,

    .set_dmamode    = sil680_set_dmamode,

diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c

index 5c62da9..f9803a2 100644

--- a/drivers/ata/sata_via.c

+++ b/drivers/ata/sata_via.c

@@ -566,7 +566,7 @@ static int svia_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)

    static int printed_version;

    unsigned int i;

    int rc;

-    struct ata_host *host;

+    struct ata_host *uninitialized_var(host);

    int board_id = (int) ent->driver_data;

    const unsigned *bar_sizes;

Justin Madru

Re: [Bug #12263] Sata soft reset filling log

[Sergei Shtylyov]

Hello.

Justin Madru wrote:

>> After referring to the SCSI command codes "cdb 0x1e" means ALLOW 
>> MEDIUM REMOVAL command -- which
>> could hardly be addressed to an usual hard disk. So, it looks like we 
>> had a case of the confused bug report which
>> has a lot of info on the hard disk while errors were most probably 
>> happening with a CD/DVD drive.

> Yes, I originally thought it was my hard disk because the kernel logs 
> showed ata2.

> But, Tejun Heo figured out it was my DVD drive (ATAPI) that was on the 
> ata2 link.

> (see http://marc.info/?l=linux-kernel&m=122993014109646&w=2)

> I tried to bisect it, but around .28-rc1 I began to get numerous compile 
> errors, so couldn't continue.

> I also tried patches that Tejun sent me, but non of them worked, it just 
> slightly change the error message.

> So, yes this is a regression that was introduced in the .28 merge 
> window, and I still think that bug #12609 is a duplicate of my bug.

    If 12609 is truly a post-2.6.28 regression and 12263 is post-2.6.27 
regresssion, this just cannot be.

> I don't see this bug on tip/master and this is the diff of origin and 
> tip at the time I tested.

> $ git diff origin/master..tip/master drivers/ata/

    What tree is that?

WBR, Sergei

Re: [Bug #12263] Sata soft reset filling log

[Justin Madru]

Sergei Shtylyov wrote:

> Hello.
>> Justin Madru wrote:
>>> After referring to the SCSI command codes "cdb 0x1e" means ALLOW 
>>> MEDIUM REMOVAL command -- which
>>> could hardly be addressed to an usual hard disk. So, it looks like 
>>> we had a case of the confused bug report which
>>> has a lot of info on the hard disk while errors were most probably 
>>> happening with a CD/DVD drive.
>>
>> Yes, I originally thought it was my hard disk because the kernel logs 
>> showed ata2.
>> But, Tejun Heo figured out it was my DVD drive (ATAPI) that was on 
>> the ata2 link.
>> (see http://marc.info/?l=linux-kernel&m=122993014109646&w=2)
>> I tried to bisect it, but around .28-rc1 I began to get numerous 
>> compile errors, so couldn't continue.
>> I also tried patches that Tejun sent me, but non of them worked, it 
>> just slightly change the error message.
>> So, yes this is a regression that was introduced in the .28 merge 
>> window, and I still think that bug #12609 is a duplicate of my bug.
>
> If 12609 is truly a post-2.6.28 regression and 12263 is post-2.6.27 
> regresssion, this just cannot be.

Maybe the reporter of #12609 didn't notice/test kernels 28-rc1 to 28. Or 
maybe the difference in hardware is
the issue, but the bug is still the same. Don't know.


>> I don't see this bug on tip/master and this is the diff of origin and 
>> tip at the time I tested.
>> $ git diff origin/master..tip/master drivers/ata/
>
> What tree is that?

This is what I have in .git/config and I get the same diff if I run:
git diff master..tip drivers/ata/  or  git diff master...tip drivers/ata/

[core]
    repositoryformatversion = 0
    filemode = true
    bare = false
    logallrefupdates = true
[remote "origin"]
    url = 
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
    fetch = +refs/heads/*:refs/remotes/origin/*
[branch "master"]
    remote = origin
    merge = refs/heads/master
[remote "tip"]
    url = 
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git
    fetch = +refs/heads/*:refs/remotes/tip/*
[branch "tip"]
    remote = tip
    merge = refs/heads/master

Justin Madru

Re: [Bug #12263] Sata soft reset filling log

[Hugh Dickins]

On Mon, 16 Feb 2009, Justin Madru wrote:
> Sergei Shtylyov wrote:
> >
> > If 12609 is truly a post-2.6.28 regression and 12263 is post-2.6.27
> > regresssion, this just cannot be.
> 
> Maybe the reporter of #12609 didn't notice/test kernels 28-rc1 to 28. Or maybe
> the difference in hardware is
> the issue, but the bug is still the same. Don't know.

Sorry Justin, you must be confused: as Sergei says,
#12609 and #12263 can only be different.

I was one of the reporters of #12609, and I do know it's a post-2.6.28
regression (and Larry said so too), and one fix (not the preferred fix)
is to revert the ata_bmdma32_port_ops from 2.6.29-rc, and the preferred
fix is to improve the ata_sff_data_xfer32() introduced in 2.6.29-rc1.

2.6.28 does not contain any ata_bmdma32_port_ops, nor ata_sff_data_xfer32(),
not did 2.6.28-rc1 contain them.  So it is impossible for the reversion of
the patch that introduced them to fix any problem on 2.6.28.

I'm quite prepared to believe that your #12263 manifests similarly to
#12609, and that a tip tree which contains a fix for #12609 contains
a fix for #12263; but please, those bugs are not the same, and they
don't have the same fix.

Hugh

Re: [Bug #12263] Sata soft reset filling log

[Justin Madru]

Hugh Dickins wrote:
> On Mon, 16 Feb 2009, Justin Madru wrote:
>   
>> Sergei Shtylyov wrote:
>>     
>>> If 12609 is truly a post-2.6.28 regression and 12263 is post-2.6.27
>>> regresssion, this just cannot be.
>>>       
>> Maybe the reporter of #12609 didn't notice/test kernels 28-rc1 to 28. Or maybe
>> the difference in hardware is
>> the issue, but the bug is still the same. Don't know.
>>     
>
> Sorry Justin, you must be confused: as Sergei says,
> #12609 and #12263 can only be different.
>
> I was one of the reporters of #12609, and I do know it's a post-2.6.28
> regression (and Larry said so too), and one fix (not the preferred fix)
> is to revert the ata_bmdma32_port_ops from 2.6.29-rc, and the preferred
> fix is to improve the ata_sff_data_xfer32() introduced in 2.6.29-rc1.
>
> 2.6.28 does not contain any ata_bmdma32_port_ops, nor ata_sff_data_xfer32(),
> not did 2.6.28-rc1 contain them.  So it is impossible for the reversion of
> the patch that introduced them to fix any problem on 2.6.28.
>
> I'm quite prepared to believe that your #12263 manifests similarly to
> #12609, and that a tip tree which contains a fix for #12609 contains
> a fix for #12263; but please, those bugs are not the same, and they
> don't have the same fix.
>
> Hugh
>
>   
Well, like I said: "[I] Don't know". I'm not a kernel developer (or even 
any developer... yet).
I'm just someone that tests the -rc kernels to see if there's any 
problems with my hardware.
I try to report any regressions to lkml, and hopefully help the developers.

To me, who has no knowledge of all these low level issues, the following 
error messages
look strikingly similar with a quick glance.

# bug 12609
# http://marc.info/?l=linux-kernel&m=123254501314058&w=4
#
ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
ata2.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
         cdb 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
         res 51/20:03:00:00:00/00:00:00:00:00/a0 Emask 0x5 (timeout)
ata2.00: status: { DRDY ERR }
ata2: soft resetting link
ata2.00: configured for UDMA/33
ata2: EH complete

# bug 12263
# http://marc.info/?l=linux-kernel&m=122913412608533&w=4
#
ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
ata2.00: ST_FIRST: !(DRQ|ERR|DF)
ata2.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
         cdb 1e 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
         res 50/00:01:00:00:00/00:00:00:00:00/a0 Emask 0x2 (HSM violation)
ata2.00: status: { DRDY }
ata2: soft resetting link
ata2.00: configured for UDMA/33
ata2: EH complete

# bug 12609
# http://marc.info/?l=linux-kernel&m=123275478111406&w=4
#
ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
ata2.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
         cdb 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
         res 51/20:03:00:00:00/00:00:00:00:00/a0 Emask 0x3 (HSM violation)
ata2.00: status: { DRDY ERR }
ata2: soft resetting link
ata2.00: configured for PIO4
ata2: EH complete

So, will the patch for 12609 fix my issue also, or does there need to be 
another patch?

Justin Madru

Re: [Bug #12263] Sata soft reset filling log

[Sergei Shtylyov]

Hello.

Justin Madru wrote:

>>>> If 12609 is truly a post-2.6.28 regression and 12263 is post-2.6.27
>>>> regresssion, this just cannot be.
>>>>       
>>> Maybe the reporter of #12609 didn't notice/test kernels 28-rc1 to 
>>> 28. Or maybe
>>> the difference in hardware is
>>> the issue, but the bug is still the same. Don't know.
>>>     
>>
>> Sorry Justin, you must be confused: as Sergei says,
>> #12609 and #12263 can only be different.
>>
>> I was one of the reporters of #12609, and I do know it's a post-2.6.28
>> regression (and Larry said so too), and one fix (not the preferred fix)
>> is to revert the ata_bmdma32_port_ops from 2.6.29-rc, and the preferred
>> fix is to improve the ata_sff_data_xfer32() introduced in 2.6.29-rc1.
>>
>> 2.6.28 does not contain any ata_bmdma32_port_ops, nor 
>> ata_sff_data_xfer32(),
>> not did 2.6.28-rc1 contain them.  So it is impossible for the 
>> reversion of
>> the patch that introduced them to fix any problem on 2.6.28.
>>
>> I'm quite prepared to believe that your #12263 manifests similarly to
>> #12609, and that a tip tree which contains a fix for #12609 contains
>> a fix for #12263; but please, those bugs are not the same, and they
>> don't have the same fix.
>>
>> Hugh
>>
>>   
> Well, like I said: "[I] Don't know". I'm not a kernel developer (or 
> even any developer... yet).
> I'm just someone that tests the -rc kernels to see if there's any 
> problems with my hardware.
> I try to report any regressions to lkml, and hopefully help the 
> developers.
>
> To me, who has no knowledge of all these low level issues, the 
> following error messages
> look strikingly similar with a quick glance.
>
> # bug 12609
> # http://marc.info/?l=linux-kernel&m=123254501314058&w=4
> #
> ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
> ata2.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
>         cdb 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
>         res 51/20:03:00:00:00/00:00:00:00:00/a0 Emask 0x5 (timeout)
> ata2.00: status: { DRDY ERR }
> ata2: soft resetting link
> ata2.00: configured for UDMA/33
> ata2: EH complete
>
> # bug 12263
> # http://marc.info/?l=linux-kernel&m=122913412608533&w=4
> #
> ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
> ata2.00: ST_FIRST: !(DRQ|ERR|DF)
> ata2.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
>         cdb 1e 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
>         res 50/00:01:00:00:00/00:00:00:00:00/a0 Emask 0x2 (HSM violation)

   Note the different value of the status, error and interrupt reason 
registers: 51/20:03 vs 50/00:01. The former means (unexpected?) status 
phase interrupt with error indication and the sense key NOT READY, the 
latter means (unexpected?) command phase interrupt with no error. IIUC, 
the former happens once the 'sr' driver first sends the TEST UNIT READY 
command while probing the CD/DVD drive, the latter seems to be a result 
of some polling process (originated from userland) -- I'm not seeing 
ALLOW_MEDIUM_REMOVAL anywhere in this driver. So they only look similar, 
I think...


> So, will the patch for 12609 fix my issue also, or does there need to 
> be another patch?

   Most probably it'll need another patch.

> Justin Madru

MBR, Sergei

Re: [Bug #12263] Sata soft reset filling log

[Justin Madru]

Sergei Shtylyov wrote:
> Hello.
>
> Justin Madru wrote:
>
>>>>> If 12609 is truly a post-2.6.28 regression and 12263 is post-2.6.27
>>>>> regresssion, this just cannot be.
>>>>>       
>>>> Maybe the reporter of #12609 didn't notice/test kernels 28-rc1 to 
>>>> 28. Or maybe
>>>> the difference in hardware is
>>>> the issue, but the bug is still the same. Don't know.
>>>>     
>>>
>>> Sorry Justin, you must be confused: as Sergei says,
>>> #12609 and #12263 can only be different.
>>>
>>> I was one of the reporters of #12609, and I do know it's a post-2.6.28
>>> regression (and Larry said so too), and one fix (not the preferred fix)
>>> is to revert the ata_bmdma32_port_ops from 2.6.29-rc, and the preferred
>>> fix is to improve the ata_sff_data_xfer32() introduced in 2.6.29-rc1.
>>>
>>> 2.6.28 does not contain any ata_bmdma32_port_ops, nor 
>>> ata_sff_data_xfer32(),
>>> not did 2.6.28-rc1 contain them.  So it is impossible for the 
>>> reversion of
>>> the patch that introduced them to fix any problem on 2.6.28.
>>>
>>> I'm quite prepared to believe that your #12263 manifests similarly to
>>> #12609, and that a tip tree which contains a fix for #12609 contains
>>> a fix for #12263; but please, those bugs are not the same, and they
>>> don't have the same fix.
>>>
>>> Hugh
>>>
>>>   
>> Well, like I said: "[I] Don't know". I'm not a kernel developer (or 
>> even any developer... yet).
>> I'm just someone that tests the -rc kernels to see if there's any 
>> problems with my hardware.
>> I try to report any regressions to lkml, and hopefully help the 
>> developers.
>>
>> To me, who has no knowledge of all these low level issues, the 
>> following error messages
>> look strikingly similar with a quick glance.
>>
>> # bug 12609
>> # http://marc.info/?l=linux-kernel&m=123254501314058&w=4
>> #
>> ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
>> ata2.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
>>         cdb 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
>>         res 51/20:03:00:00:00/00:00:00:00:00/a0 Emask 0x5 (timeout)
>> ata2.00: status: { DRDY ERR }
>> ata2: soft resetting link
>> ata2.00: configured for UDMA/33
>> ata2: EH complete
>>
>> # bug 12263
>> # http://marc.info/?l=linux-kernel&m=122913412608533&w=4
>> #
>> ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
>> ata2.00: ST_FIRST: !(DRQ|ERR|DF)
>> ata2.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
>>         cdb 1e 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
>>         res 50/00:01:00:00:00/00:00:00:00:00/a0 Emask 0x2 (HSM 
>> violation)
>
>   Note the different value of the status, error and interrupt reason 
> registers: 51/20:03 vs 50/00:01. The former means (unexpected?) status 
> phase interrupt with error indication and the sense key NOT READY, the 
> latter means (unexpected?) command phase interrupt with no error. 
> IIUC, the former happens once the 'sr' driver first sends the TEST 
> UNIT READY command while probing the CD/DVD drive, the latter seems to 
> be a result of some polling process (originated from userland) -- I'm 
> not seeing ALLOW_MEDIUM_REMOVAL anywhere in this driver. So they only 
> look similar, I think...

And that is why I'm a tester and you're a developer ;) Thanks for the 
info! Next time I'll look closer
and maybe know what I'm actually looking at.
>
>
>> So, will the patch for 12609 fix my issue also, or does there need to 
>> be another patch?
>
>   Most probably it'll need another patch.
So then, #12263 should be reopened and marked as not a duplicate.
Anyways, if tip/master gets merged how it is now then my bug should be 
fixed.

Justin Madru

[Bug #12265] FPU emulation broken in 2.6.28-rc8 ?

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12265
Subject		: FPU emulation broken in 2.6.28-rc8 ?
Submitter	: Rogier Wolff <R.E.Wolff-bu/CaDbLbdHGjfRZg6uqBA@public.gmane.org>
Date		: 2008-12-17 8:56 (60 days old)
References	: http://marc.info/?l=linux-kernel&m=122950463030747&w=4

Re: [Bug #12265] FPU emulation broken in 2.6.28-rc8 ?

[Ingo Molnar]

* Rafael J. Wysocki <rjw-KKrjLPT3xs0@public.gmane.org> wrote:

> This message has been generated automatically as a part of a report
> of regressions introduced between 2.6.27 and 2.6.28.
> 
> The following bug entry is on the current list of known regressions
> introduced between 2.6.27 and 2.6.28.  Please verify if it still should
> be listed and let me know (either way).
> 
> 
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12265
> Subject		: FPU emulation broken in 2.6.28-rc8 ?
> Submitter	: Rogier Wolff <R.E.Wolff-bu/CaDbLbdHGjfRZg6uqBA@public.gmane.org>
> Date		: 2008-12-17 8:56 (60 days old)
> References	: http://marc.info/?l=linux-kernel&m=122950463030747&w=4

Should be fixed in -rc5 by:

  d315760: x86: fix math_emu register frame access

Rogier, can you confirm?

	Ingo

[Bug #12224] journal activity on inactive partition causes inactive harddrive spinup

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12224
Subject		: journal activity on inactive partition causes inactive harddrive spinup
Submitter	: C Sights <csights-97jfqw80gc6171pxa8y+qA@public.gmane.org>
Date		: 2008-12-14 11:39 (63 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c87591b719737b4e91eb1a9fa8fd55a4ff1886d6
Handled-By	: Eric Sandeen <sandeen-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Re: [Bug #12224] journal activity on inactive partition causes inactive harddrive spinup

[Theodore Tso]

On Sat, Feb 14, 2009 at 09:50:20PM +0100, Rafael J. Wysocki wrote:
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12224
> Subject		: journal activity on inactive partition causes inactive harddrive spinup
> Submitter	: C Sights <csights-97jfqw80gc6171pxa8y+qA@public.gmane.org>
> Date		: 2008-12-14 11:39 (63 days old)
> First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c87591b719737b4e91eb1a9fa8fd55a4ff1886d6
> Handled-By	: Eric Sandeen <sandeen-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> 

The fix for this has landed in mainline as commit 02ac59 for ext3, and
commit 9eddac for ext4.

Rafael, I've marked the bug closed in BZ for your convenience.

    	    	     	       	  	      	 - Ted

Re: [Bug #12224] journal activity on inactive partition causes inactive harddrive spinup

[Rafael J. Wysocki]

On Monday 23 February 2009, Theodore Tso wrote:
> On Sat, Feb 14, 2009 at 09:50:20PM +0100, Rafael J. Wysocki wrote:
> > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12224
> > Subject		: journal activity on inactive partition causes inactive harddrive spinup
> > Submitter	: C Sights <csights-97jfqw80gc6171pxa8y+qA@public.gmane.org>
> > Date		: 2008-12-14 11:39 (63 days old)
> > First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c87591b719737b4e91eb1a9fa8fd55a4ff1886d6
> > Handled-By	: Eric Sandeen <sandeen-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> > 
> 
> The fix for this has landed in mainline as commit 02ac59 for ext3, and
> commit 9eddac for ext4.
> 
> Rafael, I've marked the bug closed in BZ for your convenience.

Thanks a lot!

Best,
Rafael

[Bug #12337] ~100 extra wakeups reported by powertop

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12337
Subject		: ~100 extra wakeups reported by powertop
Submitter	: Alberto Gonzalez <luis6674-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-31 12:25 (46 days old)

Re: [Bug #12337] ~100 extra wakeups reported by powertop

[Alberto Gonzalez]

--- On Sat, 2/14/09, Rafael J. Wysocki <rjw-KKrjLPT3xs0@public.gmane.org> wrote:

> The following bug entry is on the current list of known
> regressions
> introduced between 2.6.27 and 2.6.28.  Please verify if it
> still should
> be listed and let me know (either way).
> 
> 
> Bug-Entry	:
> http://bugzilla.kernel.org/show_bug.cgi?id=12337
> Subject		: ~100 extra wakeups reported by powertop
> Submitter	: Alberto Gonzalez <luis6674-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>
> Date		: 2008-12-31 12:25 (46 days old)

Yes, still present in latest stable 2.6.28.5

I updated the report to say that this happened on my 5 year old Pentium 4, but now I got a new Dell desktop (Intel G45 based) and the exact same problem happens, so I can't be the only one seeing it. In the bugzilla Eric Anholt said that it could be related to vblank and that jbarnes had look into a similar issue before, so maybe he has some clue.

Thanks.


      

Re: [Bug #12337] ~100 extra wakeups reported by powertop

[Rafael J. Wysocki]

On Sunday 15 February 2009, Alberto Gonzalez wrote:
> --- On Sat, 2/14/09, Rafael J. Wysocki <rjw-KKrjLPT3xs0@public.gmane.org> wrote:
> 
> > The following bug entry is on the current list of known
> > regressions
> > introduced between 2.6.27 and 2.6.28.  Please verify if it
> > still should
> > be listed and let me know (either way).
> > 
> > 
> > Bug-Entry	:
> > http://bugzilla.kernel.org/show_bug.cgi?id=12337
> > Subject		: ~100 extra wakeups reported by powertop
> > Submitter	: Alberto Gonzalez <luis6674-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>
> > Date		: 2008-12-31 12:25 (46 days old)
> 
> Yes, still present in latest stable 2.6.28.5
> 
> I updated the report to say that this happened on my 5 year old Pentium 4, but now I got a new Dell desktop (Intel G45 based) and the exact same problem happens, so I can't be the only one seeing it. In the bugzilla Eric Anholt said that it could be related to vblank and that jbarnes had look into a similar issue before, so maybe he has some clue.

Thanks a lot for the update.

Rafael

[Bug #12401] 2.6.28 regression: xbacklight broken on ThinkPad X61s

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12401
Subject		: 2.6.28 regression: xbacklight broken on ThinkPad X61s
Submitter	: Tino Keitel <tino.keitel-Mmb7MZpHnFY@public.gmane.org>
Date		: 2009-01-05 8:39 (41 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=22c13f9d8179f4c9caecfcb60a95214562b9addc
References	: http://marc.info/?l=linux-kernel&m=123114479110314&w=4

Re: [Bug #12401] 2.6.28 regression: xbacklight broken on ThinkPad X61s

[Matthew Garrett]

This one sounded like a configuration error.

-- 
Matthew Garrett | mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org

Re: [Bug #12401] 2.6.28 regression: xbacklight broken on ThinkPad X61s

[Rafael J. Wysocki]

On Sunday 15 February 2009, Matthew Garrett wrote:
> This one sounded like a configuration error.

Tino?

Re: [Bug #12401] 2.6.28 regression: xbacklight broken on ThinkPad X61s

[Tino Keitel]

On Sun, Feb 15, 2009 at 15:38:28 +0100, Rafael J. Wysocki wrote:
> On Sunday 15 February 2009, Matthew Garrett wrote:
> > This one sounded like a configuration error.

I think if it works without DRI in 2.6.27 and doesn't work in 2.6.28,
it isn't a configuration error, but a real regression.

Regards,
Tino

Re: [Bug #12401] 2.6.28 regression: xbacklight broken on ThinkPad X61s

[Matthew Garrett]

On Sun, Feb 15, 2009 at 11:16:47PM +0100, Tino Keitel wrote:

> I think if it works without DRI in 2.6.27 and doesn't work in 2.6.28,
> it isn't a configuration error, but a real regression.

It only worked by accident without DRM support, since you were using the 
ATI codepath in the firmware rather than the Intel one. That bug's been 
fixed, so now you're following the Intel codepath - unfortunately 
there's no way to do that without kernel-level graphics support, which 
means DRM.

-- 
Matthew Garrett | mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org

Re: [Bug #12401] 2.6.28 regression: xbacklight broken on ThinkPad X61s

[Ingo Molnar]

* Matthew Garrett <mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org> wrote:

> On Sun, Feb 15, 2009 at 11:16:47PM +0100, Tino Keitel wrote:
> 
> > I think if it works without DRI in 2.6.27 and doesn't work in 2.6.28,
> > it isn't a configuration error, but a real regression.
> 
> It only worked by accident without DRM support, since you were using the 
> ATI codepath in the firmware rather than the Intel one. That bug's been 
> fixed, [...]

Which precise commit ID is that?

> [...] so now you're following the Intel codepath - unfortunately 
> there's no way to do that without kernel-level graphics support, which 
> means DRM.

Tino, does it all work fine if CONFIG_DRM is enabled?

	Ingo

Re: [Bug #12401] 2.6.28 regression: xbacklight broken on ThinkPad X61s

[Matthew Garrett]

On Mon, Feb 16, 2009 at 01:37:40PM +0100, Ingo Molnar wrote:
> 
> * Matthew Garrett <mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org> wrote:
> 
> > On Sun, Feb 15, 2009 at 11:16:47PM +0100, Tino Keitel wrote:
> > 
> > > I think if it works without DRI in 2.6.27 and doesn't work in 2.6.28,
> > > it isn't a configuration error, but a real regression.
> > 
> > It only worked by accident without DRM support, since you were using the 
> > ATI codepath in the firmware rather than the Intel one. That bug's been 
> > fixed, [...]
> 
> Which precise commit ID is that?

22c13f9d8179f4c9caecfcb60a95214562b9addc

-- 
Matthew Garrett | mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org

[Bug #12403] TTY problem on linux-2.6.28-rc7

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12403
Subject		: TTY problem on linux-2.6.28-rc7
Submitter	: sasa sasa <sasak.1983-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-22 4:23 (55 days old)
References	: http://marc.info/?l=linux-kernel&m=122991914600390&w=4

Re: [Bug #12403] TTY problem on linux-2.6.28-rc7

[Aristeu Rozanski]

> This message has been generated automatically as a part of a report
> of regressions introduced between 2.6.27 and 2.6.28.
> 
> The following bug entry is on the current list of known regressions
> introduced between 2.6.27 and 2.6.28.  Please verify if it still should
> be listed and let me know (either way).
> 
> 
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12403
> Subject		: TTY problem on linux-2.6.28-rc7
> Submitter	: sasa sasa <sasak.1983-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Date		: 2008-12-22 4:23 (55 days old)
> References	: http://marc.info/?l=linux-kernel&m=122991914600390&w=4
according to
	http://marc.info/?l=linux-kernel&m=123054911532245&w=4
which is a reply to the first post, it's not a kernel problem

-- 
Aristeu

Re: [Bug #12403] TTY problem on linux-2.6.28-rc7

[Rafael J. Wysocki]

On Monday 16 February 2009, Aristeu Rozanski wrote:
> > This message has been generated automatically as a part of a report
> > of regressions introduced between 2.6.27 and 2.6.28.
> > 
> > The following bug entry is on the current list of known regressions
> > introduced between 2.6.27 and 2.6.28.  Please verify if it still should
> > be listed and let me know (either way).
> > 
> > 
> > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12403
> > Subject		: TTY problem on linux-2.6.28-rc7
> > Submitter	: sasa sasa <sasak.1983@gmail.com>
> > Date		: 2008-12-22 4:23 (55 days old)
> > References	: http://marc.info/?l=linux-kernel&m=122991914600390&w=4
> according to
> 	http://marc.info/?l=linux-kernel&m=123054911532245&w=4
> which is a reply to the first post, it's not a kernel problem

OK, I've closed the bug.

Thanks,
Rafael

[Bug #12393] debugging in dosemu causes lots of 'scheduling while atomic'

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12393
Subject		: debugging in dosemu causes lots of 'scheduling while atomic'
Submitter	: Michal Suchanek <hramrach-aRb0bU7PRFPrBKCeMvbIDA@public.gmane.org>
Date		: 2009-01-09 07:28 (37 days old)
Handled-By	: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
Patch		: http://lkml.org/lkml/2009/1/13/445

[Bug #12395] 2.6.28-rc9: oprofile regression

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12395
Subject		: 2.6.28-rc9: oprofile regression
Submitter	: Tim Blechmann <tim-xpEK/MU0Hawdnm+yROfE0A@public.gmane.org>
Date		: 2008-12-21 14:23 (56 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b99170288421c79f0c2efa8b33e26e65f4bb7fb8
References	: http://marc.info/?l=linux-kernel&m=122986946614791&w=4
Handled-By	: Andi Kleen <ak-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>

[Bug #12404] Oops in 2.6.28-rc9 and -rc8 -- mtrr issues / e1000e

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12404
Subject		: Oops in 2.6.28-rc9 and -rc8 -- mtrr issues / e1000e
Submitter	: Kernel <kernel-nOyj/A09A+/k1uMJSBkQmQ@public.gmane.org>
Date		: 2008-12-22 9:37 (55 days old)
References	: http://marc.info/?l=linux-kernel&m=122993873320150&w=4

[Bug #12405] oops in __bounce_end_io_read under kvm

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12405
Subject		: oops in __bounce_end_io_read under kvm
Submitter	: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Date		: 2008-12-26 17:36 (51 days old)
References	: http://marc.info/?l=linux-kernel&m=123031303400676&w=4
Handled-By	: Jens Axboe <jens.axboe-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>

[Bug #12406] 2.6.28 thinks that my PS/2 mouse is a touchpad

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12406
Subject		: 2.6.28 thinks that my PS/2 mouse is a touchpad
Submitter	: Alexander E. Patrakov <patrakov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-27 9:06 (50 days old)
References	: http://marc.info/?l=linux-kernel&m=123036893817280&w=4
Handled-By	: Arjan Opmeer <arjan-OssVvNj1wBysTnJN9+BGXg@public.gmane.org>
Patch		: http://marc.info/?l=linux-kernel&m=123092147703236&w=4

Re: [Bug #12406] 2.6.28 thinks that my PS/2 mouse is a touchpad

[Alexander E. Patrakov]

"Rafael J. Wysocki" <rjw-KKrjLPT3xs0@public.gmane.org> wrote:

> This message has been generated automatically as a part of a report
> of regressions introduced between 2.6.27 and 2.6.28.
> 
> The following bug entry is on the current list of known regressions
> introduced between 2.6.27 and 2.6.28.  Please verify if it still
> should be listed and let me know (either way).

Yes, it is still a regression with a patch that is not in -stable.

> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12406
> Subject		: 2.6.28 thinks that my PS/2 mouse is a
> touchpad Submitter	: Alexander E. Patrakov <patrakov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Date		: 2008-12-27 9:06 (50 days old)
> References	:
> http://marc.info/?l=linux-kernel&m=123036893817280&w=4
> Handled-By	: Arjan Opmeer <arjan-OssVvNj1wBysTnJN9+BGXg@public.gmane.org>
> Patch		:
> http://marc.info/?l=linux-kernel&m=123092147703236&w=4

-- 
Alexander E. Patrakov

Re: [Bug #12406] 2.6.28 thinks that my PS/2 mouse is a touchpad

[Rafael J. Wysocki]

On Sunday 15 February 2009, Alexander E. Patrakov wrote:
> "Rafael J. Wysocki" <rjw-KKrjLPT3xs0@public.gmane.org> wrote:
> 
> > This message has been generated automatically as a part of a report
> > of regressions introduced between 2.6.27 and 2.6.28.
> > 
> > The following bug entry is on the current list of known regressions
> > introduced between 2.6.27 and 2.6.28.  Please verify if it still
> > should be listed and let me know (either way).
> 
> Yes, it is still a regression with a patch that is not in -stable.

I think it hasn't been merged yet.
 
> > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12406
> > Subject		: 2.6.28 thinks that my PS/2 mouse is a
> > touchpad Submitter	: Alexander E. Patrakov <patrakov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > Date		: 2008-12-27 9:06 (50 days old)
> > References	:
> > http://marc.info/?l=linux-kernel&m=123036893817280&w=4
> > Handled-By	: Arjan Opmeer <arjan-OssVvNj1wBysTnJN9+BGXg@public.gmane.org>
> > Patch		:
> > http://marc.info/?l=linux-kernel&m=123092147703236&w=4

[Bug #12408] Funny problem with 2.6.28: Kernel stalls

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12408
Subject		: Funny problem with 2.6.28: Kernel stalls
Submitter	: Michael Roth <mroth-+8Z3Oe2AQjqzQB+pC5nmwQ@public.gmane.org>
Date		: 2008-12-25 15:14 (52 days old)
References	: http://marc.info/?l=linux-kernel&m=123021931714282&w=4

[Bug #12409] NULL pointer dereference at get_stats()

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12409
Subject		: NULL pointer dereference at get_stats()
Submitter	: Tetsuo Handa <penguin-kernel-1yMVhJb1mP/7nzcFbJAaVXf5DAMn2ifp@public.gmane.org>
Date		: 2008-12-30 12:53 (47 days old)
References	: http://marc.info/?l=linux-kernel&m=123064167008695&w=4
Handled-By	: Frederik Deweerdt <frederik.deweerdt-kjvbsxwSFqI@public.gmane.org>

[Bug #12411] 2.6.28: BUG in r8169

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12411
Subject		: 2.6.28: BUG in r8169
Submitter	: Andrey Vul <andrey.vul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-31 18:37 (46 days old)
References	: http://marc.info/?l=linux-kernel&m=123074869611409&w=4

[Bug #12407] Kernel 2.6.28 regression: Hang after hibernate

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12407
Subject		: Kernel 2.6.28 regression: Hang after hibernate
Submitter	: Frank Groeneveld <frankgroeneveld-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-28 20:34 (49 days old)
References	: http://marc.info/?l=linux-kernel&m=123049651906081&w=4

[Bug #12465] KVM guests stalling on 2.6.28 (bisected)

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12465
Subject		: KVM guests stalling on 2.6.28 (bisected)
Submitter	: Kevin Shanahan <kmshanah-biM/RbsGxha6c6uEtOJ/EA@public.gmane.org>
Date		: 2009-01-17 03:37 (29 days old)

Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected) [Bug 12465]

[Kevin Shanahan]

On Sat, 2009-02-14 at 21:50 +0100, Rafael J. Wysocki wrote:
> This message has been generated automatically as a part of a report
> of regressions introduced between 2.6.27 and 2.6.28.
> 
> The following bug entry is on the current list of known regressions
> introduced between 2.6.27 and 2.6.28.  Please verify if it still should
> be listed and let me know (either way).

Yes, this should still be listed.

I just tested against 2.6.29-rc5 and the problem is as bad as ever
(perhaps worse?)

--- hermes-old.wumi.org.au ping statistics ---
900 packets transmitted, 448 received, +317 errors, 50% packet loss, time 899845ms
rtt min/avg/max/mdev = 0.131/420.015/10890.699/1297.022 ms, pipe 11

The guest being pinged crashed during the test - the QEMU monitor was
accessible, but the guest didn't respond to "sendkey alt-sysrq-s", etc.
This was the last thing in the guest syslog after reboot:

Feb 15 19:48:58 hermes-old kernel: ------------[ cut here ]------------
Feb 15 19:48:58 hermes-old kernel: WARNING: at net/sched/sch_generic.c:219 dev_watchdog+0x111/0x195()
Feb 15 19:48:58 hermes-old kernel: NETDEV WATCHDOG: eth0 (8139too): transmit timed out
Feb 15 19:48:58 hermes-old kernel: Pid: 0, comm: swapper Not tainted 2.6.27.10 #1
Feb 15 19:48:58 hermes-old kernel:  [<c011d75c>] warn_slowpath+0x5c/0x81
Feb 15 19:48:58 hermes-old kernel:  [<c02f5f7c>] nf_hook_slow+0x44/0xb1
Feb 15 19:48:58 hermes-old kernel:  [<c02d93f1>] dev_queue_xmit+0x3da/0x411
Feb 15 19:48:58 hermes-old kernel:  [<c030043d>] ip_finish_output+0x1f9/0x231
Feb 15 19:48:58 hermes-old kernel:  [<c01daeee>] __next_cpu+0x12/0x21
Feb 15 19:48:58 hermes-old kernel:  [<c0116b42>] find_busiest_group+0x232/0x69f
Feb 15 19:48:58 hermes-old kernel:  [<c01160dc>] update_curr+0x41/0x65
Feb 15 19:48:58 hermes-old kernel:  [<c02e33b5>] dev_watchdog+0x111/0x195
Feb 15 19:48:58 hermes-old kernel:  [<c011822f>] enqueue_task_fair+0x16/0x24
Feb 15 19:48:58 hermes-old kernel:  [<c0115645>] enqueue_task+0xa/0x14
Feb 15 19:48:58 hermes-old kernel:  [<c01156d5>] activate_task+0x16/0x1b
Feb 15 19:48:58 hermes-old kernel:  [<c0119c8c>] try_to_wake_up+0x131/0x13a
Feb 15 19:48:58 hermes-old kernel:  [<c02e32a4>] dev_watchdog+0x0/0x195
Feb 15 19:48:58 hermes-old kernel:  [<c012424c>] run_timer_softirq+0xf5/0x14a
Feb 15 19:48:58 hermes-old kernel:  [<c0120f60>] __do_softirq+0x5d/0xc1
Feb 15 19:48:58 hermes-old kernel:  [<c0120ff6>] do_softirq+0x32/0x36
Feb 15 19:48:58 hermes-old kernel:  [<c012112c>] irq_exit+0x35/0x40
Feb 15 19:48:58 hermes-old kernel:  [<c010e8db>] smp_apic_timer_interrupt+0x6e/0x7b
Feb 15 19:48:58 hermes-old kernel:  [<c01035ac>] apic_timer_interrupt+0x28/0x30
Feb 15 19:48:58 hermes-old kernel:  [<c0107386>] default_idle+0x2a/0x3d
Feb 15 19:48:58 hermes-old kernel:  [<c0101900>] cpu_idle+0x5c/0x84
Feb 15 19:48:58 hermes-old kernel:  =======================
Feb 15 19:48:58 hermes-old kernel: ---[ end trace eff10a8043ac4e7b ]---
Feb 15 19:49:01 hermes-old kernel: eth0: Transmit timeout, status 0d 0000 c07f media d0.
Feb 15 19:49:01 hermes-old kernel: eth0: Tx queue start entry 839  dirty entry 839.
Feb 15 19:49:01 hermes-old kernel: eth0:  Tx descriptor 0 is 0008a03c.
Feb 15 19:49:01 hermes-old kernel: eth0:  Tx descriptor 1 is 0008a062.
Feb 15 19:49:01 hermes-old kernel: eth0:  Tx descriptor 2 is 0008a062.
Feb 15 19:49:01 hermes-old kernel: eth0:  Tx descriptor 3 is 0008a05b. (queue head)
Feb 15 19:49:01 hermes-old kernel: eth0: link up, 100Mbps, full-duplex, lpa 0x05E1

I think I saw some patches to fix the latency tracer for non-RT tasks on
the mailing list a while ago. If that's still going to be a useful test,
can someone give me some hints on which kernel tree and/or patches to
download to get that working? The simpler you can make it, the better ;)

Cheers,
Kevin.

Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected) [Bug 12465]

[Ingo Molnar]

* Kevin Shanahan <kmshanah@ucwb.org.au> wrote:

> On Sat, 2009-02-14 at 21:50 +0100, Rafael J. Wysocki wrote:
> > This message has been generated automatically as a part of a report
> > of regressions introduced between 2.6.27 and 2.6.28.
> > 
> > The following bug entry is on the current list of known regressions
> > introduced between 2.6.27 and 2.6.28.  Please verify if it still should
> > be listed and let me know (either way).
> 
> Yes, this should still be listed.
> 
> I just tested against 2.6.29-rc5 and the problem is as bad as ever
> (perhaps worse?)
> 
> --- hermes-old.wumi.org.au ping statistics ---
> 900 packets transmitted, 448 received, +317 errors, 50% packet loss, time 899845ms
> rtt min/avg/max/mdev = 0.131/420.015/10890.699/1297.022 ms, pipe 11

i looked at the trace you did earlier and which you uploaded to:

  http://disenchant.net/tmp/bug-12465/trace-1/

Here is one 3 seconds (!) latency:

 0)  qemu-sy-4237  |               |      kvm_vcpu_block() {
 0)  qemu-sy-4237  |               |        kvm_cpu_has_interrupt() {
 0)  qemu-sy-4237  |               |          kvm_apic_has_interrupt() {
 0)  qemu-sy-4237  |   0.291 us    |          }
 0)  qemu-sy-4237  |               |          kvm_apic_accept_pic_intr() {
 0)  qemu-sy-4237  |   0.291 us    |          }
 0)  qemu-sy-4237  |   1.476 us    |        }
 0)  qemu-sy-4237  |               |        kvm_cpu_has_pending_timer() {
 0)  qemu-sy-4237  |   0.325 us    |        }
 0)  qemu-sy-4237  |               |        kvm_arch_vcpu_runnable() {
 0)  qemu-sy-4237  |   0.288 us    |        }
 0)  qemu-sy-4237  |               |        kvm_arch_vcpu_put() {
 0)  qemu-sy-4237  |   0.415 us    |        }
 0)  qemu-sy-4237  |               |        schedule() {
 0)  qemu-sy-4237  |               |          wakeup_preempt_entity() {
 0)  qemu-sy-4237  |   0.300 us    |          }
 ------------------------------------------
 0)  qemu-sy-4237  =>   ksoftir-4   
 ------------------------------------------

 0)   ksoftir-4    | ! 3010470 us |  }
 ------------------------------------------
 0)   ksoftir-4    =>  qemu-sy-4355 
 ------------------------------------------

 0)  qemu-sy-4355  |   1.575 us    |          }
 0)  qemu-sy-4355  |   6.520 us    |        }
 0)  qemu-sy-4355  |   7.121 us    |      }
 0)  qemu-sy-4355  |               |      __wake_up() {
 0)  qemu-sy-4355  |               |        __wake_up_common() {
 0)  qemu-sy-4355  |               |          autoremove_wake_function() {
 0)  qemu-sy-4355  |               |            default_wake_function() {

qemu-sy-4237 has been scheduled away, and the system appeared to have done
nothing in the meantime. That's not something that really looks like a
scheduler regression - there is nothing the scheduler can do if KVM
decides to block a task.

It would be nice to enhance this single-CPU trace some more - to more
surgically see what is going on. Firstly, absolute timestamps would be
nice:

  echo funcgraph-abstime  > trace_options
  echo funcgraph-proc     > trace_options

as it's a bit hard to see the global timescale of events.

Secondly, not all events are included - in particular i dont really see
the points when packets are passed. Would it be possible to add a tracing
hypercall so that the guest kernel can inject trace events that can be seen
on the native-side trace? Regarding ping latencies really just two things
matter: the loopback network device's rx and tx path. We should trace the
outgoing sequence number and the incoming sequence number of IP packets,
and inject that to the host side. This way we can correlate the delays
precisely.

	Ingo

Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected) [bug 12465]

[Kevin Shanahan]

On Sun, 2009-02-15 at 11:04 +0100, Ingo Molnar wrote:
> qemu-sy-4237 has been scheduled away, and the system appeared to have done
> nothing in the meantime. That's not something that really looks like a
> scheduler regression - there is nothing the scheduler can do if KVM
> decides to block a task.
> 
> It would be nice to enhance this single-CPU trace some more - to more
> surgically see what is going on. Firstly, absolute timestamps would be
> nice:
> 
>   echo funcgraph-abstime  > trace_options
>   echo funcgraph-proc     > trace_options
> 
> as it's a bit hard to see the global timescale of events.

I was going to try and grab the trace with absolute timestamps tonight,
but that option doesn't seem to be available in Linus' current kernel.

flexo:/sys/kernel/debug/tracing# echo 0 > tracing_enabled
flexo:/sys/kernel/debug/tracing# echo function_graph > current_tracer
flexo:/sys/kernel/debug/tracing# echo funcgraph-proc > trace_options
flexo:/sys/kernel/debug/tracing# echo funcgraph-abstime  > trace_options
-su: echo: write error: Invalid argument
flexo:/sys/kernel/debug/tracing# cat trace_options 
print-parent nosym-offset nosym-addr noverbose noraw nohex nobin noblock
nostacktrace nosched-tree ftrace_printk noftrace_preempt nobranch
annotate nouserstacktrace nosym-userobj noprintk-msg-only
nofuncgraph-overrun funcgraph-cpu funcgraph-overhead funcgraph-proc 
flexo:/sys/kernel/debug/tracing# uname -a
Linux flexo 2.6.29-rc5-00299-gadfafef #6 SMP Sun Feb 22 20:09:37 CST
2009 x86_64 GNU/Linux

What am I missing?

Cheers,
Kevin.

Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected) [bug 12465]

[Ingo Molnar]

* Kevin Shanahan <kmshanah-biM/RbsGxha6c6uEtOJ/EA@public.gmane.org> wrote:

> On Sun, 2009-02-15 at 11:04 +0100, Ingo Molnar wrote:
> > qemu-sy-4237 has been scheduled away, and the system appeared to have done
> > nothing in the meantime. That's not something that really looks like a
> > scheduler regression - there is nothing the scheduler can do if KVM
> > decides to block a task.
> > 
> > It would be nice to enhance this single-CPU trace some more - to more
> > surgically see what is going on. Firstly, absolute timestamps would be
> > nice:
> > 
> >   echo funcgraph-abstime  > trace_options
> >   echo funcgraph-proc     > trace_options
> > 
> > as it's a bit hard to see the global timescale of events.
> 
> I was going to try and grab the trace with absolute timestamps 
> tonight, but that option doesn't seem to be available in 
> Linus' current kernel.
> 
> flexo:/sys/kernel/debug/tracing# echo 0 > tracing_enabled
> flexo:/sys/kernel/debug/tracing# echo function_graph > current_tracer
> flexo:/sys/kernel/debug/tracing# echo funcgraph-proc > trace_options
> flexo:/sys/kernel/debug/tracing# echo funcgraph-abstime  > trace_options
> -su: echo: write error: Invalid argument
> flexo:/sys/kernel/debug/tracing# cat trace_options 
> print-parent nosym-offset nosym-addr noverbose noraw nohex nobin noblock
> nostacktrace nosched-tree ftrace_printk noftrace_preempt nobranch
> annotate nouserstacktrace nosym-userobj noprintk-msg-only
> nofuncgraph-overrun funcgraph-cpu funcgraph-overhead funcgraph-proc 
> flexo:/sys/kernel/debug/tracing# uname -a
> Linux flexo 2.6.29-rc5-00299-gadfafef #6 SMP Sun Feb 22 20:09:37 CST
> 2009 x86_64 GNU/Linux
> 
> What am I missing?

(replying here too - replied in the bugzilla already)

that's a feature of the latest tracing tree, so if you try -tip 
you'll have it.

	Ingo

Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected) [Bug 12465]

[Kevin Shanahan]

On Sun, 2009-02-15 at 11:04 +0100, Ingo Molnar wrote:
> It would be nice to enhance this single-CPU trace some more - to more
> surgically see what is going on. Firstly, absolute timestamps would be
> nice:
> 
>   echo funcgraph-abstime  > trace_options
>   echo funcgraph-proc     > trace_options
> 
> as it's a bit hard to see the global timescale of events.

Okay, here's some more trace data. I grabbed a few samples at different
times during the ping test. I think the data in files trace6.txt and
trace8.txt coincided with some of the biggest delays.

  http://disenchant.net/tmp/bug-12465/trace-2/

This is captured on 2.6.29-rc5-tip-02057-gaad11ad. The kvm guest being
pinged is process 11211:

  flexo:~# pstree -p 11211
  qemu-system-x86(11211)─┬─{qemu-system-x86}(11212)
                         ├─{qemu-system-x86}(11213)
                         └─{qemu-system-x86}(11609)

Cheers,
Kevin.

> Secondly, not all events are included - in particular i dont really see
> the points when packets are passed. Would it be possible to add a tracing
> hypercall so that the guest kernel can inject trace events that can be seen
> on the native-side trace? Regarding ping latencies really just two things
> matter: the loopback network device's rx and tx path. We should trace the
> outgoing sequence number and the incoming sequence number of IP packets,
> and inject that to the host side. This way we can correlate the delays
> precisely.
> 
> 	Ingo

[Bug #12500] r8169: NETDEV WATCHDOG: eth0 (r8169): transmit timed out

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12500
Subject		: r8169: NETDEV WATCHDOG: eth0 (r8169): transmit timed out
Submitter	: Justin Piszcz <jpiszcz-BP4nVm5VUdNhbmWW9KSYcQ@public.gmane.org>
Date		: 2009-01-13 21:19 (33 days old)
References	: http://marc.info/?l=linux-kernel&m=123188160811322&w=4
Handled-By	: Francois Romieu <romieu-W8zweXLXuWQS+FvcfC7Uqw@public.gmane.org>

[Bug #12421] GPF on 2.6.28 and 2.6.28-rc9-git3, e1000e and e1000 issues

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12421
Subject		: GPF on 2.6.28 and 2.6.28-rc9-git3, e1000e and e1000 issues
Submitter	: Doug Bazarnic <doug-nOyj/A09A+/k1uMJSBkQmQ@public.gmane.org>
Date		: 2009-01-09 21:26 (37 days old)
References	: http://marc.info/?l=linux-kernel&m=123153653120204&w=4

[Bug #12559] Huawei E169 doesn't work as mass storage anymore

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12559
Subject		: Huawei E169 doesn't work as mass storage anymore
Submitter	: kpalberg <kpalberg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2009-01-28 02:34 (18 days old)

[Bug #12614] WOL with forcedeth broken since f55c21fd9a92a444e55ad1ca4e4732d56661bf2e

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12614
Subject		: WOL with forcedeth broken since f55c21fd9a92a444e55ad1ca4e4732d56661bf2e
Submitter	: Philipp Matthias Hahn <pmhahn-u4khhh1J0LzF41mA0N3lWw@public.gmane.org>
Date		: 2009-01-29 6:31 (17 days old)
References	: http://marc.info/?l=linux-kernel&m=123321232825316&w=4
Handled-By	: Yinghai Lu <yinghai-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
		  Tobias Diedrich <ranma+kernel-YxUgxmcw2FPQD6PfKP4TzA@public.gmane.org>
Patch		: http://marc.info/?l=linux-kernel&m=123330459229248&w=4
		  http://marc.info/?l=linux-kernel&m=123411195117835&w=4

[Bug #12612] hard lockup when interrupting cdda2wav

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12612
Subject		: hard lockup when interrupting cdda2wav
Submitter	: Matthias Reichl <hias-vtPv7MOkFPkAvxtiuMwx3w@public.gmane.org>
Date		: 2009-01-28 16:41 (18 days old)
References	: http://marc.info/?l=linux-kernel&m=123316111415677&w=4
Handled-By	: FUJITA Tomonori <fujita.tomonori-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org>
Patch		: http://marc.info/?l=linux-scsi&m=123371501613019&w=2

Re: [Bug #12612] hard lockup when interrupting cdda2wav

[Matthias Reichl]

The bug is still present in 2.6.28.5:

=============================================
[ INFO: possible recursive locking detected ]
2.6.28.5-dbg #1
---------------------------------------------
swapper/0 is trying to acquire lock:
 (&q->__queue_lock){.+..}, at: [<ffffffff8040e615>] blk_put_request+0x25/0x60

but task is already holding lock:
 (&q->__queue_lock){.+..}, at: [<ffffffff8040e4fa>] blk_end_io+0x5a/0xa0

other info that might help us debug this:
1 lock held by swapper/0:
 #0:  (&q->__queue_lock){.+..}, at: [<ffffffff8040e4fa>] blk_end_io+0x5a/0xa0

stack backtrace:
Pid: 0, comm: swapper Not tainted 2.6.28.5-dbg #1
Call Trace:
 <IRQ>  [<ffffffff8026cd07>] __lock_acquire+0x1797/0x1930
 [<ffffffff806abf8b>] error_exit+0x29/0xa9
 [<ffffffff80521f40>] sg_rq_end_io+0x0/0x2e0
 [<ffffffff8026cf3a>] lock_acquire+0x9a/0xe0
 [<ffffffff8040e615>] blk_put_request+0x25/0x60
 [<ffffffff806ab973>] _spin_lock_irqsave+0x43/0x90
 [<ffffffff8040e615>] blk_put_request+0x25/0x60
 [<ffffffff8040e615>] blk_put_request+0x25/0x60
 [<ffffffff80520a94>] sg_finish_rem_req+0xa4/0x100
 [<ffffffff805221b8>] sg_rq_end_io+0x278/0x2e0
 [<ffffffff8040e2a1>] end_that_request_last+0x61/0x260
 [<ffffffff8040e508>] blk_end_io+0x68/0xa0
 [<ffffffff80508181>] scsi_end_request+0x41/0xd0
 [<ffffffff80508870>] scsi_io_completion+0x130/0x470
 [<ffffffff80413405>] blk_done_softirq+0x75/0x90
 [<ffffffff802488ab>] __do_softirq+0x9b/0x180
 [<ffffffff80213df3>] native_sched_clock+0x13/0x70
 [<ffffffff8020d6ec>] call_softirq+0x1c/0x30
 [<ffffffff8020f175>] do_softirq+0x65/0xa0
 [<ffffffff80248345>] irq_exit+0xa5/0xb0
 [<ffffffff8020f467>] do_IRQ+0x107/0x1d0
 [<ffffffff8020c7fb>] ret_from_intr+0x0/0xf
 <EOI>  [<ffffffff80214ba6>] mwait_idle+0x56/0x60
 [<ffffffff80214b9d>] mwait_idle+0x4d/0x60
 [<ffffffff8020b353>] cpu_idle+0x63/0xc0

Re: [Bug #12612] hard lockup when interrupting cdda2wav

[Rafael J. Wysocki]

On Tuesday 17 February 2009, Matthias Reichl wrote:
> The bug is still present in 2.6.28.5:
> 
> =============================================
> [ INFO: possible recursive locking detected ]
> 2.6.28.5-dbg #1
> ---------------------------------------------
> swapper/0 is trying to acquire lock:
>  (&q->__queue_lock){.+..}, at: [<ffffffff8040e615>] blk_put_request+0x25/0x60
> 
> but task is already holding lock:
>  (&q->__queue_lock){.+..}, at: [<ffffffff8040e4fa>] blk_end_io+0x5a/0xa0
> 
> other info that might help us debug this:
> 1 lock held by swapper/0:
>  #0:  (&q->__queue_lock){.+..}, at: [<ffffffff8040e4fa>] blk_end_io+0x5a/0xa0
> 
> stack backtrace:
> Pid: 0, comm: swapper Not tainted 2.6.28.5-dbg #1
> Call Trace:
>  <IRQ>  [<ffffffff8026cd07>] __lock_acquire+0x1797/0x1930
>  [<ffffffff806abf8b>] error_exit+0x29/0xa9
>  [<ffffffff80521f40>] sg_rq_end_io+0x0/0x2e0
>  [<ffffffff8026cf3a>] lock_acquire+0x9a/0xe0
>  [<ffffffff8040e615>] blk_put_request+0x25/0x60
>  [<ffffffff806ab973>] _spin_lock_irqsave+0x43/0x90
>  [<ffffffff8040e615>] blk_put_request+0x25/0x60
>  [<ffffffff8040e615>] blk_put_request+0x25/0x60
>  [<ffffffff80520a94>] sg_finish_rem_req+0xa4/0x100
>  [<ffffffff805221b8>] sg_rq_end_io+0x278/0x2e0
>  [<ffffffff8040e2a1>] end_that_request_last+0x61/0x260
>  [<ffffffff8040e508>] blk_end_io+0x68/0xa0
>  [<ffffffff80508181>] scsi_end_request+0x41/0xd0
>  [<ffffffff80508870>] scsi_io_completion+0x130/0x470
>  [<ffffffff80413405>] blk_done_softirq+0x75/0x90
>  [<ffffffff802488ab>] __do_softirq+0x9b/0x180
>  [<ffffffff80213df3>] native_sched_clock+0x13/0x70
>  [<ffffffff8020d6ec>] call_softirq+0x1c/0x30
>  [<ffffffff8020f175>] do_softirq+0x65/0xa0
>  [<ffffffff80248345>] irq_exit+0xa5/0xb0
>  [<ffffffff8020f467>] do_IRQ+0x107/0x1d0
>  [<ffffffff8020c7fb>] ret_from_intr+0x0/0xf
>  <EOI>  [<ffffffff80214ba6>] mwait_idle+0x56/0x60
>  [<ffffffff80214b9d>] mwait_idle+0x4d/0x60
>  [<ffffffff8020b353>] cpu_idle+0x63/0xc0

Thanks for the update.

Rafael

Re: [Bug #12612] hard lockup when interrupting cdda2wav

[FUJITA Tomonori]

On Tue, 17 Feb 2009 21:23:12 +0100
"Rafael J. Wysocki" <rjw-KKrjLPT3xs0@public.gmane.org> wrote:

> On Tuesday 17 February 2009, Matthias Reichl wrote:
> > The bug is still present in 2.6.28.5:
> > 
> > =============================================
> > [ INFO: possible recursive locking detected ]
> > 2.6.28.5-dbg #1
> > ---------------------------------------------
> > swapper/0 is trying to acquire lock:
> >  (&q->__queue_lock){.+..}, at: [<ffffffff8040e615>] blk_put_request+0x25/0x60
> > 
> > but task is already holding lock:
> >  (&q->__queue_lock){.+..}, at: [<ffffffff8040e4fa>] blk_end_io+0x5a/0xa0
> > 
> > other info that might help us debug this:
> > 1 lock held by swapper/0:
> >  #0:  (&q->__queue_lock){.+..}, at: [<ffffffff8040e4fa>] blk_end_io+0x5a/0xa0
> > 
> > stack backtrace:
> > Pid: 0, comm: swapper Not tainted 2.6.28.5-dbg #1
> > Call Trace:
> >  <IRQ>  [<ffffffff8026cd07>] __lock_acquire+0x1797/0x1930

There is a patch for this but it might take some time to push it into
mainline (I hope that James will move the pending sg fixes to
scsi-fixes tree but it might be too late):

http://marc.info/?l=linux-scsi&m=123436612119386&w=2

Sorry about that again.

[Bug #12619] Regression 2.6.28 and last - boot failed

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12619
Subject		: Regression 2.6.28 and last - boot failed
Submitter	: jan sonnek <ha2nny-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2009-02-01 19:59 (14 days old)
References	: http://marc.info/?l=linux-kernel&m=123351836213969&w=4

[Bug #12658] ThrustMaster Firestorm Dual Power 3 Gamepads stopped working

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12658
Subject		: ThrustMaster Firestorm Dual Power 3 Gamepads stopped working
Submitter	: Frank Roscher <Frank-Roscher-hi6Y0CQ0nG0@public.gmane.org>
Date		: 2009-02-08 08:45 (7 days old)

[Bug #12690] DPMS (LCD powersave, poweroff) don't work

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12690
Subject		: DPMS (LCD powersave, poweroff) don't work
Submitter	: Antonin Kolisek <akolisek-T3ps84XAcx36AaHJ4hbVU+3CNBr840j2@public.gmane.org>
Date		: 2009-02-11 09:40 (4 days old)

[Bug #12645] DMI low-memory-protect quirk causes resume hang on Samsung NC10

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12645
Subject		: DMI low-memory-protect quirk causes resume hang on Samsung NC10
Submitter	: Patrick Walton <pcwalton-764C0pRuGfqVc3sceRu5cw@public.gmane.org>
Date		: 2009-02-06 18:35 (9 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0af40a4b1050c050e62eb1dc30b82d5ab22bf221

[Bug #12634] video distortion and lockup with i830 video chip and 2.6.28.3

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12634
Subject		: video distortion and lockup with i830 video chip and 2.6.28.3
Submitter	: Bob Raitz <pappy_mcfae-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>
Date		: 2009-02-04 21:10 (11 days old)

2.6.29-rc8-git5: Reported regressions 2.6.27 -> 2.6.28

[Rafael J. Wysocki]

This message contains a list of some regressions introduced between 2.6.27 and
2.6.28, for which there are no fixes in the mainline I know of.  If any of them
have been fixed already, please let me know.

If you know of any other unresolved regressions introduced between 2.6.27
and 2.6.28, please let me know either and I'll add them to the list.
Also, please let me know if any of the entries below are invalid.

Each entry from the list will be sent additionally in an automatic reply to
this message with CCs to the people involved in reporting and handling the
issue.


Listed regressions statistics:

  Date          Total  Pending  Unresolved
  ----------------------------------------
  2009-03-21      156       17          15
  2009-03-14      156       19          16
  2009-03-03      153       21          16
  2009-02-24      154       27          23
  2009-02-15      152       30          26
  2009-02-04      149       33          30
  2009-01-20      144       30          27
  2009-01-11      139       33          30
  2008-12-21      120       19          17
  2008-12-13      111       14          13
  2008-12-07      106       20          17
  2008-12-04      106       29          21
  2008-11-22       93       25          15
  2008-11-16       89       32          18
  2008-11-09       73       40          27
  2008-11-02       55       41          29
  2008-10-25       26       25          20


Unresolved regressions
----------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12911
Subject		: Limiting cpu time doesn't work
Submitter	: Peter Lojkin <ia6432@inbox.ru>
Date		: 2009-03-19 18:34 (3 days old)
References	: http://marc.info/?l=linux-kernel&m=123749066504641&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12868
Subject		: iproute2 and regressing "ipv6: convert tunnels to net_device_ops"
Submitter	: Jan Engelhardt <jengelh@medozas.de>
Date		: 2009-03-09 14:46 (13 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1326c3d5a4b792a2b15877feb7fb691f8945d203
References	: http://marc.info/?l=linux-netdev&m=123660999632730&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12818
Subject		: iwlagn broken after suspend to RAM (iwlagn: MAC is in deep sleep!)
Submitter	: Stefan Seyfried <seife@suse.de>
Date		: 2009-03-04 08:32 (18 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12690
Subject		: DPMS (LCD powersave, poweroff) don't work
Submitter	: Antonin Kolisek <akolisek@linuxx.hyperlinx.cz>
Date		: 2009-02-11 09:40 (39 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12645
Subject		: DMI low-memory-protect quirk causes resume hang on Samsung NC10
Submitter	: Patrick Walton <pcwalton@cs.ucla.edu>
Date		: 2009-02-06 18:35 (44 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0af40a4b1050c050e62eb1dc30b82d5ab22bf221


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12634
Subject		: video distortion and lockup with i830 video chip and 2.6.28.3
Submitter	: Bob Raitz <pappy_mcfae@yahoo.com>
Date		: 2009-02-04 21:10 (46 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12619
Subject		: Regression 2.6.28 and last - boot failed
Submitter	: jan sonnek <ha2nny@gmail.com>
Date		: 2009-02-01 19:59 (49 days old)
References	: http://marc.info/?l=linux-kernel&m=123351836213969&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12500
Subject		: r8169: NETDEV WATCHDOG: eth0 (r8169): transmit timed out
Submitter	: Justin Piszcz <jpiszcz@lucidpixels.com>
Date		: 2009-01-13 21:19 (68 days old)
References	: http://marc.info/?l=linux-kernel&m=123188160811322&w=4
Handled-By	: Francois Romieu <romieu@fr.zoreil.com>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12465
Subject		: KVM guests stalling on 2.6.28 (bisected)
Submitter	: Kevin Shanahan <kmshanah@ucwb.org.au>
Date		: 2009-01-17 03:37 (64 days old)
References	: http://lkml.org/lkml/2009/3/15/51
Handled-By	: Avi Kivity <avi@redhat.com>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12426
Subject		: TMDC Joystick no longer works in kernel 2.6.28
Submitter	: Andrew S. Johnson <andy@asjohnson.com>
Date		: 2009-01-10 21:53 (71 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=6902c0bead4ce266226fc0c5b3828b850bdc884a
References	: http://marc.info/?l=linux-kernel&m=123162486415366&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12421
Subject		: GPF on 2.6.28 and 2.6.28-rc9-git3, e1000e and e1000 issues
Submitter	: Doug Bazarnic <doug@bazarnic.net>
Date		: 2009-01-09 21:26 (72 days old)
References	: http://marc.info/?l=linux-kernel&m=123153653120204&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12411
Subject		: 2.6.28: BUG in r8169
Submitter	: Andrey Vul <andrey.vul@gmail.com>
Date		: 2008-12-31 18:37 (81 days old)
References	: http://marc.info/?l=linux-kernel&m=123074869611409&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12404
Subject		: Oops in 2.6.28-rc9 and -rc8 -- mtrr issues / e1000e
Submitter	: Kernel <kernel@bazarnic.net>
Date		: 2008-12-22 9:37 (90 days old)
References	: http://marc.info/?l=linux-kernel&m=122993873320150&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12209
Subject		: oldish top core dumps (in its meminfo() function)
Submitter	: Andreas Mohr <andi@lisas.de>
Date		: 2008-12-12 18:49 (100 days old)
References	: http://marc.info/?l=linux-kernel&m=122910784006472&w=4
		  http://marc.info/?l=linux-kernel&m=122907511319288&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12061
Subject		: snd_hda_intel: power_save: sound cracks on powerdown
Submitter	: Jens Weibler <bugzilla-kernel@jensthebrain.de>
Date		: 2008-11-18 12:07 (124 days old)
Handled-By	: Takashi Iwai <tiwai@suse.de>


Regressions with patches
------------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12612
Subject		: hard lockup when interrupting cdda2wav
Submitter	: Matthias Reichl <hias@horus.com>
Date		: 2009-01-28 16:41 (53 days old)
References	: http://marc.info/?l=linux-kernel&m=123316111415677&w=4
Handled-By	: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Patch		: http://marc.info/?l=linux-scsi&m=123371501613019&w=2


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos@szeredi.hu>
Date		: 2008-12-12 9:35 (100 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4
Handled-By	: Miklos Szeredi <miklos@szeredi.hu>
Patch		: http://marc.info/?l=linux-kernel&m=123750152920779&w=4


For details, please visit the bug entries and follow the links given in
references.

As you can see, there is a Bugzilla entry for each of the listed regressions.
There also is a Bugzilla entry used for tracking the regressions introduced
between 2.6.27 and 2.6.28, unresolved as well as resolved, at:

http://bugzilla.kernel.org/show_bug.cgi?id=11808

Please let me know if there are any Bugzilla entries that should be added to
the list in there.

Thanks,
Rafael

[Bug #12208] uml is very slow on 2.6.28 host

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
Date		: 2008-12-12 9:35 (100 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4
Handled-By	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
Patch		: http://marc.info/?l=linux-kernel&m=123750152920779&w=4

2.6.29-rc8: Reported regressions 2.6.27 -> 2.6.28

[Rafael J. Wysocki]

This message contains a list of some regressions introduced between 2.6.27 and
2.6.28, for which there are no fixes in the mainline I know of.  If any of them
have been fixed already, please let me know.

If you know of any other unresolved regressions introduced between 2.6.27
and 2.6.28, please let me know either and I'll add them to the list.
Also, please let me know if any of the entries below are invalid.

Each entry from the list will be sent additionally in an automatic reply to
this message with CCs to the people involved in reporting and handling the
issue.


Listed regressions statistics:

  Date          Total  Pending  Unresolved
  ----------------------------------------
  2009-03-14      156       19          16
  2009-03-03      153       21          16
  2009-02-24      154       27          23
  2009-02-15      152       30          26
  2009-02-04      149       33          30
  2009-01-20      144       30          27
  2009-01-11      139       33          30
  2008-12-21      120       19          17
  2008-12-13      111       14          13
  2008-12-07      106       20          17
  2008-12-04      106       29          21
  2008-11-22       93       25          15
  2008-11-16       89       32          18
  2008-11-09       73       40          27
  2008-11-02       55       41          29
  2008-10-25       26       25          20


Unresolved regressions
----------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12868
Subject		: iproute2 and regressing "ipv6: convert tunnels to net_device_ops"
Submitter	: Jan Engelhardt <jengelh@medozas.de>
Date		: 2009-03-09 14:46 (6 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1326c3d5a4b792a2b15877feb7fb691f8945d203
References	: http://marc.info/?l=linux-netdev&m=123660999632730&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12818
Subject		: iwlagn broken after suspend to RAM (iwlagn: MAC is in deep sleep!)
Submitter	: Stefan Seyfried <seife@suse.de>
Date		: 2009-03-04 08:32 (11 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12690
Subject		: DPMS (LCD powersave, poweroff) don't work
Submitter	: Antonin Kolisek <akolisek@linuxx.hyperlinx.cz>
Date		: 2009-02-11 09:40 (32 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12645
Subject		: DMI low-memory-protect quirk causes resume hang on Samsung NC10
Submitter	: Patrick Walton <pcwalton@cs.ucla.edu>
Date		: 2009-02-06 18:35 (37 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0af40a4b1050c050e62eb1dc30b82d5ab22bf221


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12634
Subject		: video distortion and lockup with i830 video chip and 2.6.28.3
Submitter	: Bob Raitz <pappy_mcfae@yahoo.com>
Date		: 2009-02-04 21:10 (39 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12619
Subject		: Regression 2.6.28 and last - boot failed
Submitter	: jan sonnek <ha2nny@gmail.com>
Date		: 2009-02-01 19:59 (42 days old)
References	: http://marc.info/?l=linux-kernel&m=123351836213969&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12500
Subject		: r8169: NETDEV WATCHDOG: eth0 (r8169): transmit timed out
Submitter	: Justin Piszcz <jpiszcz@lucidpixels.com>
Date		: 2009-01-13 21:19 (61 days old)
References	: http://marc.info/?l=linux-kernel&m=123188160811322&w=4
Handled-By	: Francois Romieu <romieu@fr.zoreil.com>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12465
Subject		: KVM guests stalling on 2.6.28 (bisected)
Submitter	: Kevin Shanahan <kmshanah@ucwb.org.au>
Date		: 2009-01-17 03:37 (57 days old)
Handled-By	: Avi Kivity <avi@redhat.com>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12426
Subject		: TMDC Joystick no longer works in kernel 2.6.28
Submitter	: Andrew S. Johnson <andy@asjohnson.com>
Date		: 2009-01-10 21:53 (64 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=6902c0bead4ce266226fc0c5b3828b850bdc884a
References	: http://marc.info/?l=linux-kernel&m=123162486415366&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12421
Subject		: GPF on 2.6.28 and 2.6.28-rc9-git3, e1000e and e1000 issues
Submitter	: Doug Bazarnic <doug@bazarnic.net>
Date		: 2009-01-09 21:26 (65 days old)
References	: http://marc.info/?l=linux-kernel&m=123153653120204&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12411
Subject		: 2.6.28: BUG in r8169
Submitter	: Andrey Vul <andrey.vul@gmail.com>
Date		: 2008-12-31 18:37 (74 days old)
References	: http://marc.info/?l=linux-kernel&m=123074869611409&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12404
Subject		: Oops in 2.6.28-rc9 and -rc8 -- mtrr issues / e1000e
Submitter	: Kernel <kernel@bazarnic.net>
Date		: 2008-12-22 9:37 (83 days old)
References	: http://marc.info/?l=linux-kernel&m=122993873320150&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12337
Subject		: ~100 extra wakeups reported by powertop
Submitter	: Alberto Gonzalez <luis6674@yahoo.com>
Date		: 2008-12-31 12:25 (74 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12209
Subject		: oldish top core dumps (in its meminfo() function)
Submitter	: Andreas Mohr <andi@lisas.de>
Date		: 2008-12-12 18:49 (93 days old)
References	: http://marc.info/?l=linux-kernel&m=122910784006472&w=4
		  http://marc.info/?l=linux-kernel&m=122907511319288&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos@szeredi.hu>
Date		: 2008-12-12 9:35 (93 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12061
Subject		: snd_hda_intel: power_save: sound cracks on powerdown
Submitter	: Jens Weibler <bugzilla-kernel@jensthebrain.de>
Date		: 2008-11-18 12:07 (117 days old)
Handled-By	: Takashi Iwai <tiwai@suse.de>


Regressions with patches
------------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12835
Subject		: Regression in backlight detection
Submitter	: Michael Spang <mspang@csclub.uwaterloo.ca>
Date		: 2009-02-24 5:41 (19 days old)
References	: http://marc.info/?l=linux-kernel&m=123545411502396&w=4
Handled-By	: Michael Spang <mspang@csclub.uwaterloo.ca>
Patch		: http://marc.info/?l=linux-kernel&m=123545411502396&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12798
Subject		: No wake up after suspend.
Submitter	: Michal Graczyk <zazulas@gmail.com>
Date		: 2009-03-01 15:30 (14 days old)
Handled-By	: Zhang Rui <rui.zhang@intel.com>
Patch		: http://bugzilla.kernel.org/attachment.cgi?id=20402&action=view


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12612
Subject		: hard lockup when interrupting cdda2wav
Submitter	: Matthias Reichl <hias@horus.com>
Date		: 2009-01-28 16:41 (46 days old)
References	: http://marc.info/?l=linux-kernel&m=123316111415677&w=4
Handled-By	: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Patch		: http://marc.info/?l=linux-scsi&m=123371501613019&w=2


For details, please visit the bug entries and follow the links given in
references.

As you can see, there is a Bugzilla entry for each of the listed regressions.
There also is a Bugzilla entry used for tracking the regressions introduced
between 2.6.27 and 2.6.28, unresolved as well as resolved, at:

http://bugzilla.kernel.org/show_bug.cgi?id=11808

Please let me know if there are any Bugzilla entries that should be added to
the list in there.

Thanks,
Rafael

[Bug #12208] uml is very slow on 2.6.28 host

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
Date		: 2008-12-12 9:35 (93 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4

2.6.29-rc6-git7: Reported regressions 2.6.27 -> 2.6.28

[Rafael J. Wysocki]

[NOTE: I'm going to close the unresolved bugs in this list where the submitter
 has not been responding.]

This message contains a list of some regressions introduced between 2.6.27 and
2.6.28, for which there are no fixes in the mainline I know of.  If any of them
have been fixed already, please let me know.

If you know of any other unresolved regressions introduced between 2.6.27
and 2.6.28, please let me know either and I'll add them to the list.
Also, please let me know if any of the entries below are invalid.

Each entry from the list will be sent additionally in an automatic reply to
this message with CCs to the people involved in reporting and handling the
issue.


Listed regressions statistics:

  Date          Total  Pending  Unresolved
  ----------------------------------------
  2009-03-03      153       21          16
  2009-02-24      154       27          23
  2009-02-15      152       30          26
  2009-02-04      149       33          30
  2009-01-20      144       30          27
  2009-01-11      139       33          30
  2008-12-21      120       19          17
  2008-12-13      111       14          13
  2008-12-07      106       20          17
  2008-12-04      106       29          21
  2008-11-22       93       25          15
  2008-11-16       89       32          18
  2008-11-09       73       40          27
  2008-11-02       55       41          29
  2008-10-25       26       25          20


Unresolved regressions
----------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12759
Subject		: scsi: aic7xxx hang since v2.6.28-rc1 ...
Submitter	: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>
Date		: 2009-02-15 11:44 (17 days old)
References	: http://marc.info/?l=linux-kernel&m=123469852817058&w=4
Handled-By	: Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12690
Subject		: DPMS (LCD powersave, poweroff) don't work
Submitter	: Antonin Kolisek <akolisek-T3ps84XAcx36AaHJ4hbVU+3CNBr840j2@public.gmane.org>
Date		: 2009-02-11 09:40 (21 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12645
Subject		: DMI low-memory-protect quirk causes resume hang on Samsung NC10
Submitter	: Patrick Walton <pcwalton-764C0pRuGfqVc3sceRu5cw@public.gmane.org>
Date		: 2009-02-06 18:35 (26 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0af40a4b1050c050e62eb1dc30b82d5ab22bf221


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12634
Subject		: video distortion and lockup with i830 video chip and 2.6.28.3
Submitter	: Bob Raitz <pappy_mcfae-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>
Date		: 2009-02-04 21:10 (28 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12619
Subject		: Regression 2.6.28 and last - boot failed
Submitter	: jan sonnek <ha2nny-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2009-02-01 19:59 (31 days old)
References	: http://marc.info/?l=linux-kernel&m=123351836213969&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12500
Subject		: r8169: NETDEV WATCHDOG: eth0 (r8169): transmit timed out
Submitter	: Justin Piszcz <jpiszcz-BP4nVm5VUdNhbmWW9KSYcQ@public.gmane.org>
Date		: 2009-01-13 21:19 (50 days old)
References	: http://marc.info/?l=linux-kernel&m=123188160811322&w=4
Handled-By	: Francois Romieu <romieu-W8zweXLXuWQS+FvcfC7Uqw@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12465
Subject		: KVM guests stalling on 2.6.28 (bisected)
Submitter	: Kevin Shanahan <kmshanah-biM/RbsGxha6c6uEtOJ/EA@public.gmane.org>
Date		: 2009-01-17 03:37 (46 days old)
Handled-By	: Avi Kivity <avi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12421
Subject		: GPF on 2.6.28 and 2.6.28-rc9-git3, e1000e and e1000 issues
Submitter	: Doug Bazarnic <doug-nOyj/A09A+/k1uMJSBkQmQ@public.gmane.org>
Date		: 2009-01-09 21:26 (54 days old)
References	: http://marc.info/?l=linux-kernel&m=123153653120204&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12411
Subject		: 2.6.28: BUG in r8169
Submitter	: Andrey Vul <andrey.vul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-31 18:37 (63 days old)
References	: http://marc.info/?l=linux-kernel&m=123074869611409&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12408
Subject		: Funny problem with 2.6.28: Kernel stalls
Submitter	: Michael Roth <mroth-+8Z3Oe2AQjqzQB+pC5nmwQ@public.gmane.org>
Date		: 2008-12-25 15:14 (69 days old)
References	: http://marc.info/?l=linux-kernel&m=123021931714282&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12405
Subject		: oops in __bounce_end_io_read under kvm
Submitter	: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Date		: 2008-12-26 17:36 (68 days old)
References	: http://marc.info/?l=linux-kernel&m=123031303400676&w=4
Handled-By	: Jens Axboe <jens.axboe-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12404
Subject		: Oops in 2.6.28-rc9 and -rc8 -- mtrr issues / e1000e
Submitter	: Kernel <kernel-nOyj/A09A+/k1uMJSBkQmQ@public.gmane.org>
Date		: 2008-12-22 9:37 (72 days old)
References	: http://marc.info/?l=linux-kernel&m=122993873320150&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12337
Subject		: ~100 extra wakeups reported by powertop
Submitter	: Alberto Gonzalez <luis6674-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-31 12:25 (63 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12209
Subject		: oldish top core dumps (in its meminfo() function)
Submitter	: Andreas Mohr <andi-5+Cda9B46AM@public.gmane.org>
Date		: 2008-12-12 18:49 (82 days old)
References	: http://marc.info/?l=linux-kernel&m=122910784006472&w=4
		  http://marc.info/?l=linux-kernel&m=122907511319288&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
Date		: 2008-12-12 9:35 (82 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12061
Subject		: snd_hda_intel: power_save: sound cracks on powerdown
Submitter	: Jens Weibler <bugzilla-kernel-6hJTtV8wudIr9FUcG+3rRQ@public.gmane.org>
Date		: 2008-11-18 12:07 (106 days old)
Handled-By	: Takashi Iwai <tiwai-l3A5Bk7waGM@public.gmane.org>


Regressions with patches
------------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12798
Subject		: No wake up after suspend.
Submitter	: Michal Graczyk <zazulas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2009-03-01 15:30 (3 days old)
Handled-By	: Zhang Rui <rui.zhang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Patch		: http://bugzilla.kernel.org/attachment.cgi?id=20402&action=view


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12614
Subject		: WOL with forcedeth broken since f55c21fd9a92a444e55ad1ca4e4732d56661bf2e
Submitter	: Philipp Matthias Hahn <pmhahn-u4khhh1J0LzF41mA0N3lWw@public.gmane.org>
Date		: 2009-01-29 6:31 (34 days old)
References	: http://marc.info/?l=linux-kernel&m=123321232825316&w=4
Handled-By	: Yinghai Lu <yinghai-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
		  Tobias Diedrich <ranma+kernel-YxUgxmcw2FPQD6PfKP4TzA@public.gmane.org>
Patch		: http://marc.info/?l=linux-kernel&m=123330459229248&w=4
		  http://marc.info/?l=linux-kernel&m=123411195117835&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12612
Subject		: hard lockup when interrupting cdda2wav
Submitter	: Matthias Reichl <hias-vtPv7MOkFPkAvxtiuMwx3w@public.gmane.org>
Date		: 2009-01-28 16:41 (35 days old)
References	: http://marc.info/?l=linux-kernel&m=123316111415677&w=4
Handled-By	: FUJITA Tomonori <fujita.tomonori-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org>
Patch		: http://marc.info/?l=linux-scsi&m=123371501613019&w=2


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12406
Subject		: 2.6.28 thinks that my PS/2 mouse is a touchpad
Submitter	: Alexander E. Patrakov <patrakov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-27 9:06 (67 days old)
References	: http://marc.info/?l=linux-kernel&m=123036893817280&w=4
Handled-By	: Arjan Opmeer <arjan-OssVvNj1wBysTnJN9+BGXg@public.gmane.org>
Patch		: http://marc.info/?l=linux-kernel&m=123092147703236&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12395
Subject		: 2.6.28-rc9: oprofile regression
Submitter	: Tim Blechmann <tim-xpEK/MU0Hawdnm+yROfE0A@public.gmane.org>
Date		: 2008-12-21 14:23 (73 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b99170288421c79f0c2efa8b33e26e65f4bb7fb8
References	: http://marc.info/?l=linux-kernel&m=122986946614791&w=4
Handled-By	: Andi Kleen <ak-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
		  Tim Blechmann <tim-xpEK/MU0Hawdnm+yROfE0A@public.gmane.org>
Patch		: http://marc.info/?l=linux-kernel&m=123506131927371&w=4


For details, please visit the bug entries and follow the links given in
references.

As you can see, there is a Bugzilla entry for each of the listed regressions.
There also is a Bugzilla entry used for tracking the regressions introduced
between 2.6.27 and 2.6.28, unresolved as well as resolved, at:

http://bugzilla.kernel.org/show_bug.cgi?id=11808

Please let me know if there are any Bugzilla entries that should be added to
the list in there.

Thanks,
Rafael

[Bug #12208] uml is very slow on 2.6.28 host

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
Date		: 2008-12-12 9:35 (82 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4

2.6.29-rc6: Reported regressions 2.6.27 -> 2.6.28

[Rafael J. Wysocki]

This message contains a list of some regressions introduced between 2.6.27 and
2.6.28, for which there are no fixes in the mainline I know of.  If any of them
have been fixed already, please let me know.

If you know of any other unresolved regressions introduced between 2.6.27
and 2.6.28, please let me know either and I'll add them to the list.
Also, please let me know if any of the entries below are invalid.

Each entry from the list will be sent additionally in an automatic reply to
this message with CCs to the people involved in reporting and handling the
issue.


Listed regressions statistics:

  Date          Total  Pending  Unresolved
  ----------------------------------------
  2009-02-24      154       27          23
  2009-02-15      152       30          26
  2009-02-04      149       33          30
  2009-01-20      144       30          27
  2009-01-11      139       33          30
  2008-12-21      120       19          17
  2008-12-13      111       14          13
  2008-12-07      106       20          17
  2008-12-04      106       29          21
  2008-11-22       93       25          15
  2008-11-16       89       32          18
  2008-11-09       73       40          27
  2008-11-02       55       41          29
  2008-10-25       26       25          20


Unresolved regressions
----------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12759
Subject		: scsi: aic7xxx hang since v2.6.28-rc1 ...
Submitter	: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>
Date		: 2009-02-15 11:44 (9 days old)
References	: http://marc.info/?l=linux-kernel&m=123469852817058&w=4
Handled-By	: Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12757
Subject		: &gt;2.6.27 dies at cardbus init on laptop
Submitter	: David Pflug <dtpflug-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2009-02-17 19:28 (7 days old)
References	: http://marc.info/?l=linux-kernel&m=123489904218306&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12690
Subject		: DPMS (LCD powersave, poweroff) don't work
Submitter	: Antonin Kolisek <akolisek-T3ps84XAcx36AaHJ4hbVU+3CNBr840j2@public.gmane.org>
Date		: 2009-02-11 09:40 (13 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12645
Subject		: DMI low-memory-protect quirk causes resume hang on Samsung NC10
Submitter	: Patrick Walton <pcwalton-764C0pRuGfqVc3sceRu5cw@public.gmane.org>
Date		: 2009-02-06 18:35 (18 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0af40a4b1050c050e62eb1dc30b82d5ab22bf221


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12634
Subject		: video distortion and lockup with i830 video chip and 2.6.28.3
Submitter	: Bob Raitz <pappy_mcfae-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>
Date		: 2009-02-04 21:10 (20 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12619
Subject		: Regression 2.6.28 and last - boot failed
Submitter	: jan sonnek <ha2nny-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2009-02-01 19:59 (23 days old)
References	: http://marc.info/?l=linux-kernel&m=123351836213969&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12559
Subject		: Huawei E169 doesn't work as mass storage anymore
Submitter	: kpalberg <kpalberg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2009-01-28 02:34 (27 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12500
Subject		: r8169: NETDEV WATCHDOG: eth0 (r8169): transmit timed out
Submitter	: Justin Piszcz <jpiszcz-BP4nVm5VUdNhbmWW9KSYcQ@public.gmane.org>
Date		: 2009-01-13 21:19 (42 days old)
References	: http://marc.info/?l=linux-kernel&m=123188160811322&w=4
Handled-By	: Francois Romieu <romieu-W8zweXLXuWQS+FvcfC7Uqw@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12465
Subject		: KVM guests stalling on 2.6.28 (bisected)
Submitter	: Kevin Shanahan <kmshanah-biM/RbsGxha6c6uEtOJ/EA@public.gmane.org>
Date		: 2009-01-17 03:37 (38 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12421
Subject		: GPF on 2.6.28 and 2.6.28-rc9-git3, e1000e and e1000 issues
Submitter	: Doug Bazarnic <doug-nOyj/A09A+/k1uMJSBkQmQ@public.gmane.org>
Date		: 2009-01-09 21:26 (46 days old)
References	: http://marc.info/?l=linux-kernel&m=123153653120204&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12411
Subject		: 2.6.28: BUG in r8169
Submitter	: Andrey Vul <andrey.vul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-31 18:37 (55 days old)
References	: http://marc.info/?l=linux-kernel&m=123074869611409&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12409
Subject		: NULL pointer dereference at get_stats()
Submitter	: Tetsuo Handa <penguin-kernel-1yMVhJb1mP/7nzcFbJAaVXf5DAMn2ifp@public.gmane.org>
Date		: 2008-12-30 12:53 (56 days old)
References	: http://marc.info/?l=linux-kernel&m=123064167008695&w=4
Handled-By	: Frederik Deweerdt <frederik.deweerdt-kjvbsxwSFqI@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12408
Subject		: Funny problem with 2.6.28: Kernel stalls
Submitter	: Michael Roth <mroth-+8Z3Oe2AQjqzQB+pC5nmwQ@public.gmane.org>
Date		: 2008-12-25 15:14 (61 days old)
References	: http://marc.info/?l=linux-kernel&m=123021931714282&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12407
Subject		: Kernel 2.6.28 regression: Hang after hibernate
Submitter	: Frank Groeneveld <frankgroeneveld-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-28 20:34 (58 days old)
References	: http://marc.info/?l=linux-kernel&m=123049651906081&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12405
Subject		: oops in __bounce_end_io_read under kvm
Submitter	: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Date		: 2008-12-26 17:36 (60 days old)
References	: http://marc.info/?l=linux-kernel&m=123031303400676&w=4
Handled-By	: Jens Axboe <jens.axboe-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12404
Subject		: Oops in 2.6.28-rc9 and -rc8 -- mtrr issues / e1000e
Submitter	: Kernel <kernel-nOyj/A09A+/k1uMJSBkQmQ@public.gmane.org>
Date		: 2008-12-22 9:37 (64 days old)
References	: http://marc.info/?l=linux-kernel&m=122993873320150&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12401
Subject		: 2.6.28 regression: xbacklight broken on ThinkPad X61s
Submitter	: Tino Keitel <tino.keitel-Mmb7MZpHnFY@public.gmane.org>
Date		: 2009-01-05 8:39 (50 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=22c13f9d8179f4c9caecfcb60a95214562b9addc
References	: http://marc.info/?l=linux-kernel&m=123114479110314&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12395
Subject		: 2.6.28-rc9: oprofile regression
Submitter	: Tim Blechmann <tim-xpEK/MU0Hawdnm+yROfE0A@public.gmane.org>
Date		: 2008-12-21 14:23 (65 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b99170288421c79f0c2efa8b33e26e65f4bb7fb8
References	: http://marc.info/?l=linux-kernel&m=122986946614791&w=4
Handled-By	: Andi Kleen <ak-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12337
Subject		: ~100 extra wakeups reported by powertop
Submitter	: Alberto Gonzalez <luis6674-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-31 12:25 (55 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12209
Subject		: oldish top core dumps (in its meminfo() function)
Submitter	: Andreas Mohr <andi-5+Cda9B46AM@public.gmane.org>
Date		: 2008-12-12 18:49 (74 days old)
References	: http://marc.info/?l=linux-kernel&m=122910784006472&w=4
		  http://marc.info/?l=linux-kernel&m=122907511319288&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
Date		: 2008-12-12 9:35 (74 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12160
Subject		: networking oops after resume from s2ram (2.6.28-rc6)
Submitter	: Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-11-28 21:15 (88 days old)
References	: http://marc.info/?l=linux-kernel&m=122790701615723&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12061
Subject		: snd_hda_intel: power_save: sound cracks on powerdown
Submitter	: Jens Weibler <bugzilla-kernel-6hJTtV8wudIr9FUcG+3rRQ@public.gmane.org>
Date		: 2008-11-18 12:07 (98 days old)
Handled-By	: Takashi Iwai <tiwai-l3A5Bk7waGM@public.gmane.org>


Regressions with patches
------------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12614
Subject		: WOL with forcedeth broken since f55c21fd9a92a444e55ad1ca4e4732d56661bf2e
Submitter	: Philipp Matthias Hahn <pmhahn-u4khhh1J0LzF41mA0N3lWw@public.gmane.org>
Date		: 2009-01-29 6:31 (26 days old)
References	: http://marc.info/?l=linux-kernel&m=123321232825316&w=4
Handled-By	: Yinghai Lu <yinghai-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
		  Tobias Diedrich <ranma+kernel-YxUgxmcw2FPQD6PfKP4TzA@public.gmane.org>
Patch		: http://marc.info/?l=linux-kernel&m=123330459229248&w=4
		  http://marc.info/?l=linux-kernel&m=123411195117835&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12612
Subject		: hard lockup when interrupting cdda2wav
Submitter	: Matthias Reichl <hias-vtPv7MOkFPkAvxtiuMwx3w@public.gmane.org>
Date		: 2009-01-28 16:41 (27 days old)
References	: http://marc.info/?l=linux-kernel&m=123316111415677&w=4
Handled-By	: FUJITA Tomonori <fujita.tomonori-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org>
Patch		: http://marc.info/?l=linux-scsi&m=123371501613019&w=2


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12406
Subject		: 2.6.28 thinks that my PS/2 mouse is a touchpad
Submitter	: Alexander E. Patrakov <patrakov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-27 9:06 (59 days old)
References	: http://marc.info/?l=linux-kernel&m=123036893817280&w=4
Handled-By	: Arjan Opmeer <arjan-OssVvNj1wBysTnJN9+BGXg@public.gmane.org>
Patch		: http://marc.info/?l=linux-kernel&m=123092147703236&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12393
Subject		: debugging in dosemu causes lots of 'scheduling while atomic'
Submitter	: Michal Suchanek <hramrach-aRb0bU7PRFPrBKCeMvbIDA@public.gmane.org>
Date		: 2009-01-09 07:28 (46 days old)
Handled-By	: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
Patch		: http://lkml.org/lkml/2009/1/13/445


For details, please visit the bug entries and follow the links given in
references.

As you can see, there is a Bugzilla entry for each of the listed regressions.
There also is a Bugzilla entry used for tracking the regressions introduced
between 2.6.27 and 2.6.28, unresolved as well as resolved, at:

http://bugzilla.kernel.org/show_bug.cgi?id=11808

Please let me know if there are any Bugzilla entries that should be added to
the list in there.

Thanks,
Rafael

[Bug #12208] uml is very slow on 2.6.28 host

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
Date		: 2008-12-12 9:35 (74 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4

Re: [Bug #12208] uml is very slow on 2.6.28 host

[greg-R92VP3DqSWVWk0Htik3J/w]

On Feb 4, 11:58am, "Rafael J. Wysocki" wrote:
} Subject: [Bug #12208] uml is very slow on 2.6.28 host

Good day to everyone.

> This message has been generated automatically as a part of a report
> of regressions introduced between 2.6.27 and 2.6.28.
> 
> The following bug entry is on the current list of known regressions
> introduced between 2.6.27 and 2.6.28.  Please verify if it still should
> be listed and let me know (either way).
> 
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
> Subject		: uml is very slow on 2.6.28 host
> Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
> Date		: 2008-12-12 9:35 (55 days old)
> References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4

I'm not convinced its as fast as it should be on 2.6.27.

I'm currently testing 2.6.27.14 hosts on several different pieces of
hardware with a common 2.6.23.17 guest.

Currently the UML guest on my desktop machine which is an 11 year old
300Mhz dual-processor Pentium-II with 256MB of RAM running 2.6.22.14
is giving a rather sound performance drubbing to the identical UML
guest running on a 2.5GHZ dual-quad 5420 with 16GB of RAM running a
32-bit 2.6.27.14.

}-- End of excerpt from "Rafael J. Wysocki"

As always,
Dr. G.W. Wettstein, Ph.D.   Enjellic Systems Development, LLC.
4206 N. 19th Ave.           Specializing in information infra-structure
Fargo, ND  58102            development.
PH: 701-281-1686
FAX: 701-281-3949           EMAIL: greg-R92VP3DqSWVWk0Htik3J/w@public.gmane.org
------------------------------------------------------------------------------
"There's no such thing as a wizard who minds his own business."
                                -- Berengis the Black Court Mage
                                   to the Earls Caeline

2.6.29-rc3-git6: Reported regressions 2.6.27 -> 2.6.28

[Rafael J. Wysocki]

This message contains a list of some regressions introduced between 2.6.27 and
2.6.28, for which there are no fixes in the mainline I know of.  If any of them
have been fixed already, please let me know.

If you know of any other unresolved regressions introduced between 2.6.27
and 2.6.28, please let me know either and I'll add them to the list.
Also, please let me know if any of the entries below are invalid.

Each entry from the list will be sent additionally in an automatic reply to
this message with CCs to the people involved in reporting and handling the
issue.


Listed regressions statistics:

  Date          Total  Pending  Unresolved
  ----------------------------------------
  2009-02-04      149       33          30
  2009-01-20      144       30          27
  2009-01-11      139       33          30
  2008-12-21      120       19          17
  2008-12-13      111       14          13
  2008-12-07      106       20          17
  2008-12-04      106       29          21
  2008-11-22       93       25          15
  2008-11-16       89       32          18
  2008-11-09       73       40          27
  2008-11-02       55       41          29
  2008-10-25       26       25          20



Unresolved regressions
----------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12619
Subject		: Regression 2.6.28 and last - boot failed
Submitter	: jan sonnek <ha2nny@gmail.com>
Date		: 2009-02-01 19:59 (4 days old)
References	: http://marc.info/?l=linux-kernel&m=123351836213969&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12612
Subject		: hard lockup when interrupting cdda2wav
Submitter	: Matthias Reichl <hias@horus.com>
Date		: 2009-01-28 16:41 (8 days old)
References	: http://marc.info/?l=linux-kernel&m=123316111415677&w=4
Handled-By	: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12559
Subject		: Huawei E169 doesn't work as mass storage anymore
Submitter	: kpalberg <kpalberg@gmail.com>
Date		: 2009-01-28 02:34 (8 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12520
Subject		: Cannot boot 2.6.28 under Dell OptiPlex 960
Submitter	: Denis Scherbakov <denis_scherbakov@yahoo.com>
Date		: 2009-01-22 04:37 (14 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12500
Subject		: r8169: NETDEV WATCHDOG: eth0 (r8169): transmit timed out
Submitter	: Justin Piszcz <jpiszcz@lucidpixels.com>
Date		: 2009-01-13 21:19 (23 days old)
References	: http://marc.info/?l=linux-kernel&m=123188160811322&w=4
Handled-By	: Francois Romieu <romieu@fr.zoreil.com>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12465
Subject		: KVM guests stalling on 2.6.28 (bisected)
Submitter	: Kevin Shanahan <kmshanah@ucwb.org.au>
Date		: 2009-01-17 03:37 (19 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12426
Subject		: TMDC Joystick no longer works in kernel 2.6.28
Submitter	: Andrew S. Johnson <andy@asjohnson.com>
Date		: 2009-01-10 21:53 (26 days old)
References	: http://marc.info/?l=linux-kernel&m=123162486415366&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12421
Subject		: GPF on 2.6.28 &amp; 2.6.28-rc9-git3    e1000e / e1000 issues
Submitter	: Doug Bazarnic <doug@bazarnic.net>
Date		: 2009-01-09 21:26 (27 days old)
References	: http://marc.info/?l=linux-kernel&m=123153653120204&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12411
Subject		: 2.6.28: BUG in r8169
Submitter	: Andrey Vul <andrey.vul@gmail.com>
Date		: 2008-12-31 18:37 (36 days old)
References	: http://marc.info/?l=linux-kernel&m=123074869611409&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12409
Subject		: NULL pointer dereference at get_stats()
Submitter	: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Date		: 2008-12-30 12:53 (37 days old)
References	: http://marc.info/?l=linux-kernel&m=123064167008695&w=4
Handled-By	: Frederik Deweerdt <frederik.deweerdt@xprog.eu>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12408
Subject		: Funny problem with 2.6.28: Kernel stalls
Submitter	: Michael Roth <mroth@nessie.de>
Date		: 2008-12-25 15:14 (42 days old)
References	: http://marc.info/?l=linux-kernel&m=123021931714282&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12407
Subject		: Kernel 2.6.28 regression: Hang after hibernate
Submitter	: Frank Groeneveld <frankgroeneveld@gmail.com>
Date		: 2008-12-28 20:34 (39 days old)
References	: http://marc.info/?l=linux-kernel&m=123049651906081&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12405
Subject		: oops in __bounce_end_io_read under kvm
Submitter	: Christoph Hellwig <hch@lst.de>
Date		: 2008-12-26 17:36 (41 days old)
References	: http://marc.info/?l=linux-kernel&m=123031303400676&w=4
Handled-By	: Jens Axboe <jens.axboe@oracle.com>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12404
Subject		: Oops in 2.6.28-rc9 and -rc8 -- mtrr issues / e1000e
Submitter	: Kernel <kernel@bazarnic.net>
Date		: 2008-12-22 9:37 (45 days old)
References	: http://marc.info/?l=linux-kernel&m=122993873320150&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12403
Subject		: TTY problem on linux-2.6.28-rc7
Submitter	: sasa sasa <sasak.1983@gmail.com>
Date		: 2008-12-22 4:23 (45 days old)
References	: http://marc.info/?l=linux-kernel&m=122991914600390&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12401
Subject		: 2.6.28 regression: xbacklight broken on ThinkPad X61s
Submitter	: Tino Keitel <tino.keitel@gmx.de>
Date		: 2009-01-05 8:39 (31 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=22c13f9d8179f4c9caecfcb60a95214562b9addc
References	: http://marc.info/?l=linux-kernel&m=123114479110314&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12395
Subject		: 2.6.28-rc9: oprofile regression
Submitter	: Tim Blechmann <tim@klingt.org>
Date		: 2008-12-21 14:23 (46 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b99170288421c79f0c2efa8b33e26e65f4bb7fb8
References	: http://marc.info/?l=linux-kernel&m=122986946614791&w=4
Handled-By	: Andi Kleen <ak@linux.intel.com>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12393
Subject		: debugging in dosemu causes lots of 'scheduling while atomic'
Submitter	: Michal Suchanek <hramrach@centrum.cz>
Date		: 2009-01-09 07:28 (27 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12391
Subject		: Processor does not go below C2 state until usb.autosuspend is enabled
Submitter	: Gergely Imreh <imrehg@gmail.com>
Date		: 2009-01-09 02:35 (27 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12337
Subject		: ~100 extra wakeups reported by powertop
Submitter	: Alberto Gonzalez <luis6674@yahoo.com>
Date		: 2008-12-31 12:25 (36 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12265
Subject		: FPU emulation broken in 2.6.28-rc8 ?
Submitter	: Rogier Wolff <R.E.Wolff@bitwizard.nl>
Date		: 2008-12-17 8:56 (50 days old)
References	: http://marc.info/?l=linux-kernel&m=122950463030747&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12264
Subject		: i915: switching from kwin in opengl mode to a VT then back to x11, x11 freezes
Submitter	: Caleb Cushing <xenoterracide@gmail.com>
Date		: 2008-12-16 11:40 (51 days old)
References	: http://marc.info/?l=linux-kernel&m=122942777030666&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12263
Subject		: Sata soft reset filling log
Submitter	: Justin Madru <bevicm@dslextreme.com>
Date		: 2008-12-13 2:07 (54 days old)
References	: http://marc.info/?l=linux-kernel&m=122913412608533&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12224
Subject		: journal activity on inactive partition causes inactive harddrive spinup
Submitter	: C Sights <csights@fastmail.fm>
Date		: 2008-12-14 11:39 (53 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c87591b719737b4e91eb1a9fa8fd55a4ff1886d6
Handled-By	: Eric Sandeen <sandeen@redhat.com>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12209
Subject		: oldish top core dumps (in its meminfo() function)
Submitter	: Andreas Mohr <andi@lisas.de>
Date		: 2008-12-12 18:49 (55 days old)
References	: http://marc.info/?l=linux-kernel&m=122910784006472&w=4
		  http://marc.info/?l=linux-kernel&m=122907511319288&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos@szeredi.hu>
Date		: 2008-12-12 9:35 (55 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12160
Subject		: networking oops after resume from s2ram (2.6.28-rc6)
Submitter	: Marcin Slusarz <marcin.slusarz@gmail.com>
Date		: 2008-11-28 21:15 (69 days old)
References	: http://marc.info/?l=linux-kernel&m=122790701615723&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12159
Subject		: 2.6.28-rc6-git1 -- No sound produced from Intel HDA ALSA driver
Submitter	: Miles Lane <miles.lane@gmail.com>
Date		: 2008-11-27 20:33 (70 days old)
References	: http://marc.info/?l=linux-kernel&m=122781805620212&w=4
Handled-By	: Takashi Iwai <tiwai@suse.de>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12061
Subject		: snd_hda_intel: power_save: sound cracks on powerdown
Submitter	: Jens Weibler <bugzilla-kernel@jensthebrain.de>
Date		: 2008-11-18 12:07 (79 days old)
Handled-By	: Takashi Iwai <tiwai@suse.de>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=11849
Subject		: default IRQ affinity change in v2.6.27 (breaking several SMP PPC based systems)
Submitter	: Kumar Gala <galak@kernel.crashing.org>
Date		: 2008-10-24 12:45 (104 days old)
References	: http://marc.info/?l=linux-kernel&m=122485245924125&w=4


Regressions with patches
------------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12614
Subject		: WOL with forcedeth broken since f55c21fd9a92a444e55ad1ca4e4732d56661bf2e
Submitter	: Philipp Matthias Hahn <pmhahn@titan.lahn.de>
Date		: 2009-01-29 6:31 (7 days old)
References	: http://marc.info/?l=linux-kernel&m=123321232825316&w=4
Handled-By	: Yinghai Lu <yinghai@kernel.org>
Patch		: http://marc.info/?l=linux-kernel&m=123330459229248&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12406
Subject		: 2.6.28 thinks that my PS/2 mouse is a touchpad
Submitter	: Alexander E. Patrakov <patrakov@gmail.com>
Date		: 2008-12-27 9:06 (40 days old)
References	: http://marc.info/?l=linux-kernel&m=123036893817280&w=4
Handled-By	: Arjan Opmeer <arjan@opmeer.net>
Patch		: http://marc.info/?l=linux-kernel&m=123092147703236&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12396
Subject		: hwinfo problem since 2.6.28
Submitter	: Beschorner Daniel <Daniel.Beschorner@facton.com>
Date		: 2009-01-06 8:53 (30 days old)
References	: http://marc.info/?l=linux-kernel&m=123123277800835&w=4
Handled-By	: Suresh Siddha <suresh.b.siddha@intel.com>
Patch		: http://marc.info/?l=linux-kernel&m=123154005127497&w=4


For details, please visit the bug entries and follow the links given in
references.

As you can see, there is a Bugzilla entry for each of the listed regressions.
There also is a Bugzilla entry used for tracking the regressions introduced
between 2.6.27 and 2.6.28, unresolved as well as resolved, at:

http://bugzilla.kernel.org/show_bug.cgi?id=11808

Please let me know if there are any Bugzilla entries that should be added to
the list in there.

Thanks,
Rafael

--
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[Bug #12208] uml is very slow on 2.6.28 host

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
Date		: 2008-12-12 9:35 (55 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4

2.6.29-rc2-git1: Reported regressions 2.6.27 -> 2.6.28

[Rafael J. Wysocki]

This message contains a list of some regressions introduced between 2.6.27 and
2.6.28, for which there are no fixes in the mainline I know of.  If any of them
have been fixed already, please let me know.

If you know of any other unresolved regressions introduced between 2.6.27
and 2.6.28, please let me know either and I'll add them to the list.
Also, please let me know if any of the entries below are invalid.

Each entry from the list will be sent additionally in an automatic reply to
this message with CCs to the people involved in reporting and handling the
issue.


Listed regressions statistics:

  Date          Total  Pending  Unresolved
  ----------------------------------------
  2009-01-20      144       30          27
  2009-01-11      139       33          30
  2008-12-21      120       19          17
  2008-12-13      111       14          13
  2008-12-07      106       20          17
  2008-12-04      106       29          21
  2008-11-22       93       25          15
  2008-11-16       89       32          18
  2008-11-09       73       40          27
  2008-11-02       55       41          29
  2008-10-25       26       25          20


Unresolved regressions
----------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12500
Subject		: r8169: NETDEV WATCHDOG: eth0 (r8169): transmit timed out
Submitter	: Justin Piszcz <jpiszcz-BP4nVm5VUdNhbmWW9KSYcQ@public.gmane.org>
Date		: 2009-01-13 21:19 (7 days old)
References	: http://marc.info/?l=linux-kernel&m=123188160811322&w=4
Handled-By	: Francois Romieu <romieu-W8zweXLXuWQS+FvcfC7Uqw@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12483
Subject		: Reference to inexistent struct dmi_device_id breaks the build
Submitter	: Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>
Date		: 2009-01-19 01:29 (1 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12465
Subject		: KVM guests stalling on 2.6.28 (bisected)
Submitter	: Kevin Shanahan <kmshanah-biM/RbsGxha6c6uEtOJ/EA@public.gmane.org>
Date		: 2009-01-17 03:37 (3 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12426
Subject		: TMDC Joystick no longer works in kernel 2.6.28
Submitter	: Andrew S. Johnson <andy-9eXmkf4BiQ2aMJb+Lgu22Q@public.gmane.org>
Date		: 2009-01-10 21:53 (10 days old)
References	: http://marc.info/?l=linux-kernel&m=123162486415366&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12421
Subject		: GPF on 2.6.28 &amp; 2.6.28-rc9-git3    e1000e / e1000 issues
Submitter	: Doug Bazarnic <doug-nOyj/A09A+/k1uMJSBkQmQ@public.gmane.org>
Date		: 2009-01-09 21:26 (11 days old)
References	: http://marc.info/?l=linux-kernel&m=123153653120204&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12411
Subject		: 2.6.28: BUG in r8169
Submitter	: Andrey Vul <andrey.vul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-31 18:37 (20 days old)
References	: http://marc.info/?l=linux-kernel&m=123074869611409&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12409
Subject		: NULL pointer dereference at get_stats()
Submitter	: Tetsuo Handa <penguin-kernel-1yMVhJb1mP/7nzcFbJAaVXf5DAMn2ifp@public.gmane.org>
Date		: 2008-12-30 12:53 (21 days old)
References	: http://marc.info/?l=linux-kernel&m=123064167008695&w=4
Handled-By	: Frederik Deweerdt <frederik.deweerdt-kjvbsxwSFqI@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12408
Subject		: Funny problem with 2.6.28: Kernel stalls
Submitter	: Michael Roth <mroth-+8Z3Oe2AQjqzQB+pC5nmwQ@public.gmane.org>
Date		: 2008-12-25 15:14 (26 days old)
References	: http://marc.info/?l=linux-kernel&m=123021931714282&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12407
Subject		: Kernel 2.6.28 regression: Hang after hibernate
Submitter	: Frank Groeneveld <frankgroeneveld-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-28 20:34 (23 days old)
References	: http://marc.info/?l=linux-kernel&m=123049651906081&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12405
Subject		: oops in __bounce_end_io_read under kvm
Submitter	: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Date		: 2008-12-26 17:36 (25 days old)
References	: http://marc.info/?l=linux-kernel&m=123031303400676&w=4
Handled-By	: Jens Axboe <jens.axboe-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12404
Subject		: Oops in 2.6.28-rc9 and -rc8 -- mtrr issues / e1000e
Submitter	: Kernel <kernel-nOyj/A09A+/k1uMJSBkQmQ@public.gmane.org>
Date		: 2008-12-22 9:37 (29 days old)
References	: http://marc.info/?l=linux-kernel&m=122993873320150&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12403
Subject		: TTY problem on linux-2.6.28-rc7
Submitter	: sasa sasa <sasak.1983-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-22 4:23 (29 days old)
References	: http://marc.info/?l=linux-kernel&m=122991914600390&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12401
Subject		: 2.6.28 regression: xbacklight broken on ThinkPad X61s
Submitter	: Tino Keitel <tino.keitel-Mmb7MZpHnFY@public.gmane.org>
Date		: 2009-01-05 8:39 (15 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=22c13f9d8179f4c9caecfcb60a95214562b9addc
References	: http://marc.info/?l=linux-kernel&m=123114479110314&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12395
Subject		: 2.6.28-rc9: oprofile regression
Submitter	: Tim Blechmann <tim-xpEK/MU0Hawdnm+yROfE0A@public.gmane.org>
Date		: 2008-12-21 14:23 (30 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b99170288421c79f0c2efa8b33e26e65f4bb7fb8
References	: http://marc.info/?l=linux-kernel&m=122986946614791&w=4
Handled-By	: Andi Kleen <ak-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12393
Subject		: debugging in dosemu causes lots of 'scheduling while atomic'
Submitter	: Michal Suchanek <hramrach-aRb0bU7PRFPrBKCeMvbIDA@public.gmane.org>
Date		: 2009-01-09 07:28 (11 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12391
Subject		: Processor does not go below C2 state until usb.autosuspend is enabled
Submitter	: Gergely Imreh <imrehg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2009-01-09 02:35 (11 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12337
Subject		: ~100 extra wakeups reported by powertop
Submitter	: Alberto Gonzalez <luis6674-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-31 12:25 (20 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12265
Subject		: FPU emulation broken in 2.6.28-rc8 ?
Submitter	: Rogier Wolff <R.E.Wolff-bu/CaDbLbdHGjfRZg6uqBA@public.gmane.org>
Date		: 2008-12-17 8:56 (34 days old)
References	: http://marc.info/?l=linux-kernel&m=122950463030747&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12264
Subject		: i915: switching from kwin in opengl mode to a VT then back to x11, x11 freezes
Submitter	: Caleb Cushing <xenoterracide-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-16 11:40 (35 days old)
References	: http://marc.info/?l=linux-kernel&m=122942777030666&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12263
Subject		: Sata soft reset filling log
Submitter	: Justin Madru <bevicm-QP1aEjBt37AFQeE35raUng@public.gmane.org>
Date		: 2008-12-13 2:07 (38 days old)
References	: http://marc.info/?l=linux-kernel&m=122913412608533&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12224
Subject		: journal activity on inactive partition causes inactive harddrive spinup
Submitter	: C Sights <csights-97jfqw80gc6171pxa8y+qA@public.gmane.org>
Date		: 2008-12-14 11:39 (37 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c87591b719737b4e91eb1a9fa8fd55a4ff1886d6
Handled-By	: Eric Sandeen <sandeen-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12209
Subject		: oldish top core dumps (in its meminfo() function)
Submitter	: Andreas Mohr <andi-5+Cda9B46AM@public.gmane.org>
Date		: 2008-12-12 18:49 (39 days old)
References	: http://marc.info/?l=linux-kernel&m=122910784006472&w=4
		  http://marc.info/?l=linux-kernel&m=122907511319288&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
Date		: 2008-12-12 9:35 (39 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12160
Subject		: networking oops after resume from s2ram (2.6.28-rc6)
Submitter	: Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-11-28 21:15 (53 days old)
References	: http://marc.info/?l=linux-kernel&m=122790701615723&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12159
Subject		: 2.6.28-rc6-git1 -- No sound produced from Intel HDA ALSA driver
Submitter	: Miles Lane <miles.lane-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-11-27 20:33 (54 days old)
References	: http://marc.info/?l=linux-kernel&m=122781805620212&w=4
Handled-By	: Takashi Iwai <tiwai-l3A5Bk7waGM@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12061
Subject		: snd_hda_intel: power_save: sound cracks on powerdown
Submitter	: Jens Weibler <bugzilla-kernel-6hJTtV8wudIr9FUcG+3rRQ@public.gmane.org>
Date		: 2008-11-18 12:07 (63 days old)
Handled-By	: Takashi Iwai <tiwai-l3A5Bk7waGM@public.gmane.org>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=11849
Subject		: default IRQ affinity change in v2.6.27 (breaking several SMP PPC based systems)
Submitter	: Kumar Gala <galak-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
Date		: 2008-10-24 12:45 (88 days old)
References	: http://marc.info/?l=linux-kernel&m=122485245924125&w=4


Regressions with patches
------------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12406
Subject		: 2.6.28 thinks that my PS/2 mouse is a touchpad
Submitter	: Alexander E. Patrakov <patrakov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2008-12-27 9:06 (24 days old)
References	: http://marc.info/?l=linux-kernel&m=123036893817280&w=4
Handled-By	: Arjan Opmeer <arjan-OssVvNj1wBysTnJN9+BGXg@public.gmane.org>
Patch		: http://marc.info/?l=linux-kernel&m=123092147703236&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12396
Subject		: hwinfo problem since 2.6.28
Submitter	: Beschorner Daniel <Daniel.Beschorner-cdG02ZADnvLQT0dZR+AlfA@public.gmane.org>
Date		: 2009-01-06 8:53 (14 days old)
References	: http://marc.info/?l=linux-kernel&m=123123277800835&w=4
Handled-By	: Suresh Siddha <suresh.b.siddha-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Patch		: http://marc.info/?l=linux-kernel&m=123154005127497&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12260
Subject		: Regression due to commit 2b80848e3818fb1c (p54usb: support LM87 firmwares)
Submitter	: Larry Finger <Larry.Finger-tQ5ms3gMjBLk1uMJSBkQmQ@public.gmane.org>
Date		: 2008-12-20 10:45 (31 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2b80848e3818fb1c8ccddc105b065a86c68afa9d
Patch		: http://bugzilla.kernel.org/show_bug.cgi?id=12260


For details, please visit the bug entries and follow the links given in
references.

As you can see, there is a Bugzilla entry for each of the listed regressions.
There also is a Bugzilla entry used for tracking the regressions introduced
between 2.6.27 and 2.6.28, unresolved as well as resolved, at:

http://bugzilla.kernel.org/show_bug.cgi?id=11808

Please let me know if there are any Bugzilla entries that should be added to
the list in there.

Thanks,
Rafael

[Bug #12208] uml is very slow on 2.6.28 host

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
Date		: 2008-12-12 9:35 (39 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4

Re: [Bug #12208] uml is very slow on 2.6.28 host

[Miklos Szeredi]

On Mon, 19 Jan 2009, Rafael J. Wysocki wrote:
> This message has been generated automatically as a part of a report
> of regressions introduced between 2.6.27 and 2.6.28.
> 
> The following bug entry is on the current list of known regressions
> introduced between 2.6.27 and 2.6.28.  Please verify if it still should
> be listed and let me know (either way).

Yes, still unfixed.  There was some private discussion with the
scheduler guys and now I suspect this is not a scheduler regression
but a more longstanding UML bug that was made visible by some
scheduler changes.

Thanks,
Miklos

> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
> Subject		: uml is very slow on 2.6.28 host
> Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
> Date		: 2008-12-12 9:35 (39 days old)
> References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4
> 
> 
> 

[Bug #12208] uml is very slow on 2.6.28 host

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.27 and 2.6.28.

The following bug entry is on the current list of known regressions
introduced between 2.6.27 and 2.6.28.  Please verify if it still should
be listed and let me know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
Date		: 2008-12-12 9:35 (31 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4

Re: [Bug #12208] uml is very slow on 2.6.28 host

[Miklos Szeredi]

On Sun, 11 Jan 2009, Rafael J. Wysocki wrote:
> This message has been generated automatically as a part of a report
> of regressions introduced between 2.6.27 and 2.6.28.
> 
> The following bug entry is on the current list of known regressions
> introduced between 2.6.27 and 2.6.28.  Please verify if it still should
> be listed and let me know (either way).
> 
> 
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
> Subject		: uml is very slow on 2.6.28 host
> Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
> Date		: 2008-12-12 9:35 (31 days old)
> References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4

Yes, this still exists on latest -git.

Thanks,
Miklos

Re: [Bug #12208] uml is very slow on 2.6.28 host

[Rafael J. Wysocki]

On Monday 12 January 2009, Miklos Szeredi wrote:
> On Sun, 11 Jan 2009, Rafael J. Wysocki wrote:
> > This message has been generated automatically as a part of a report
> > of regressions introduced between 2.6.27 and 2.6.28.
> > 
> > The following bug entry is on the current list of known regressions
> > introduced between 2.6.27 and 2.6.28.  Please verify if it still should
> > be listed and let me know (either way).
> > 
> > 
> > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
> > Subject		: uml is very slow on 2.6.28 host
> > Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
> > Date		: 2008-12-12 9:35 (31 days old)
> > References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4
> 
> Yes, this still exists on latest -git.

Thanks for the update.

Rafael

2.6.28-rc9-git1: Reported regressions from 2.6.27

[Rafael J. Wysocki]

This message contains a list of some regressions from 2.6.27, for which there
are no fixes in the mainline I know of.  If any of them have been fixed already,
please let me know.

If you know of any other unresolved regressions from 2.6.27, please let me know
either and I'll add them to the list.  Also, please let me know if any of the
entries below are invalid.

Each entry from the list will be sent additionally in an automatic reply to
this message with CCs to the people involved in reporting and handling the
issue.


Listed regressions statistics:

  Date          Total  Pending  Unresolved
  ----------------------------------------
  2008-12-21      120       19          17
  2008-12-13      111       14          13
  2008-12-07      106       20          17
  2008-12-04      106       29          21
  2008-11-22       93       25          15
  2008-11-16       89       32          18
  2008-11-09       73       40          27
  2008-11-02       55       41          29
  2008-10-25       26       25          20


Unresolved regressions
----------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12265
Subject		: FPU emulation broken in 2.6.28-rc8 ?
Submitter	: Rogier Wolff <R.E.Wolff@bitwizard.nl>
Date		: 2008-12-17 8:56 (4 days old)
References	: http://marc.info/?l=linux-kernel&m=122950463030747&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12264
Subject		: i915: switching from kwin in opengl mode to a VT then back to x11, x11 freezes
Submitter	: Caleb Cushing <xenoterracide@gmail.com>
Date		: 2008-12-16 11:40 (5 days old)
References	: http://marc.info/?l=linux-kernel&m=122942777030666&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12263
Subject		: Sata soft reset filling log
Submitter	: Justin Madru <bevicm@dslextreme.com>
Date		: 2008-12-13 2:07 (8 days old)
References	: http://marc.info/?l=linux-kernel&m=122913412608533&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12256
Subject		: [regression: 2.6.28] NFS client with locking fails
Submitter	: Kees Cook <kees@outflux.net>
Date		: 2008-12-19 13:38 (2 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12224
Subject		: journal activity on inactive partition causes inactive harddrive spinup
Submitter	: C Sights <csights@fastmail.fm>
Date		: 2008-12-14 11:39 (7 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c87591b719737b4e91eb1a9fa8fd55a4ff1886d6
Handled-By	: Eric Sandeen <sandeen@redhat.com>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12216
Subject		: Error when drm is loaded
Submitter	: François Valenduc <francois.valenduc@tvcablenet.be>
Date		: 2008-12-13 09:59 (8 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=52440211dcdc52c0b757f8b34d122e11b12cdd50


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12210
Subject		: 2.6.28-rc8 big regression in VM
Submitter	: Lukas Hejtmanek <xhejtman@ics.muni.cz>
Date		: 2008-12-12 18:38 (9 days old)
References	: http://marc.info/?l=linux-kernel&m=122910711005135&w=4
Handled-By	: Wu Fengguang <fengguang.wu@intel.com>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12209
Subject		: oldish top core dumps (in its meminfo() function)
Submitter	: Andreas Mohr <andi@lisas.de>
Date		: 2008-12-12 18:49 (9 days old)
References	: http://marc.info/?l=linux-kernel&m=122910784006472&w=4
		  http://marc.info/?l=linux-kernel&m=122907511319288&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos@szeredi.hu>
Date		: 2008-12-12 9:35 (9 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12195
Subject		: "dd" make kernel panic
Submitter	: alexs <alex.shi@intel.com>
Date		: 2008-12-10 18:07 (11 days old)
Handled-By	: James Bottomley <James.Bottomley@HansenPartnership.com>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12178
Subject		: Xorg crash at first start
Submitter	: Cédric Godin <cedric@belbone.be>
Date		: 2008-12-04 14:26 (17 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=52440211dcdc52c0b757f8b34d122e11b12cdd50
References	: http://marc.info/?l=linux-kernel&m=122840082828098&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12160
Subject		: networking oops after resume from s2ram (2.6.28-rc6)
Submitter	: Marcin Slusarz <marcin.slusarz@gmail.com>
Date		: 2008-11-28 21:15 (23 days old)
References	: http://marc.info/?l=linux-kernel&m=122790701615723&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12159
Subject		: 2.6.28-rc6-git1 -- No sound produced from Intel HDA ALSA driver
Submitter	: Miles Lane <miles.lane@gmail.com>
Date		: 2008-11-27 20:33 (24 days old)
References	: http://marc.info/?l=linux-kernel&m=122781805620212&w=4
Handled-By	: Takashi Iwai <tiwai@suse.de>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12156
Subject		: v2.6.28-rc2: x86_32 relocation regression?
Submitter	: Vegard Nossum <vegard.nossum@gmail.com>
Date		: 2008-11-24 21:19 (27 days old)
References	: http://marc.info/?l=linux-kernel&m=122756158220966&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12061
Subject		: snd_hda_intel: power_save: sound cracks on powerdown
Submitter	: Jens Weibler <bugzilla-kernel@jensthebrain.de>
Date		: 2008-11-18 12:07 (33 days old)
Handled-By	: Takashi Iwai <tiwai@suse.de>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12028
Subject		: i915 DRM is broken in 2.6.28-rc4
Submitter	: Adam Tkac <vonsch@gmail.com>
Date		: 2008-11-14 01:50 (37 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=11849
Subject		: default IRQ affinity change in v2.6.27 (breaking several SMP PPC based systems)
Submitter	: Kumar Gala <galak@kernel.crashing.org>
Date		: 2008-10-24 12:45 (58 days old)
References	: http://marc.info/?l=linux-kernel&m=122485245924125&w=4


Regressions with patches
------------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12260
Subject		: Regression due to commit 2b80848e3818fb1c (p54usb: support LM87 firmwares)
Submitter	: Larry Finger <Larry.Finger@lwfinger.net>
Date		: 2008-12-20 10:45 (1 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2b80848e3818fb1c8ccddc105b065a86c68afa9d
Patch		: http://bugzilla.kernel.org/show_bug.cgi?id=12260


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12252
Subject		: new oops on resume due to ACPI_PREEMPTION_POINT()
Submitter	: Len Brown <len.brown@intel.com>
Date		: 2008-12-18 18:17 (3 days old)
Handled-By	: Len Brown <lenb@kernel.org>
Patch		: http://bugzilla.kernel.org/attachment.cgi?id=19370&action=view


For details, please visit the bug entries and follow the links given in
references.

As you can see, there is a Bugzilla entry for each of the listed regressions.
There also is a Bugzilla entry used for tracking the regressions from 2.6.27,
unresolved as well as resolved, at:

http://bugzilla.kernel.org/show_bug.cgi?id=11808

Please let me know if there are any Bugzilla entries that should be added to
the list in there.

Thanks,
Rafael

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[Bug #12208] uml is very slow on 2.6.28 host

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of recent regressions.

The following bug entry is on the current list of known regressions
from 2.6.27.  Please verify if it still should be listed and let me know
(either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
Date		: 2008-12-12 9:35 (9 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4

2.6.28-rc8-git1: Reported regressions from 2.6.27

[Rafael J. Wysocki]

This message contains a list of some regressions from 2.6.27, for which there
are no fixes in the mainline I know of.  If any of them have been fixed already,
please let me know.

If you know of any other unresolved regressions from 2.6.27, please let me know
either and I'll add them to the list.  Also, please let me know if any of the
entries below are invalid.

Each entry from the list will be sent additionally in an automatic reply to
this message with CCs to the people involved in reporting and handling the
issue.


Listed regressions statistics:

  Date          Total  Pending  Unresolved
  ----------------------------------------
  2008-12-13      111       14          13
  2008-12-07      106       20          17
  2008-12-04      106       29          21
  2008-11-22       93       25          15
  2008-11-16       89       32          18
  2008-11-09       73       40          27
  2008-11-02       55       41          29
  2008-10-25       26       25          20


Unresolved regressions
----------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12210
Subject		: 2.6.28-rc8 big regression in VM
Submitter	: Lukas Hejtmanek <xhejtman@ics.muni.cz>
Date		: 2008-12-12 18:38 (2 days old)
References	: http://marc.info/?l=linux-kernel&m=122910711005135&w=4
Handled-By	: Wu Fengguang <fengguang.wu@intel.com>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12209
Subject		: oldish top core dumps (in its meminfo() function)
Submitter	: Andreas Mohr <andi@lisas.de>
Date		: 2008-12-12 18:49 (2 days old)
References	: http://marc.info/?l=linux-kernel&m=122910784006472&w=4
		  http://marc.info/?l=linux-kernel&m=122907511319288&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos@szeredi.hu>
Date		: 2008-12-12 9:35 (2 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12195
Subject		: "dd" make kernel panic
Submitter	: alexs <alex.shi@intel.com>
Date		: 2008-12-10 18:07 (4 days old)
Handled-By	: James Bottomley <James.Bottomley@HansenPartnership.com>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12178
Subject		: Xorg crash at first start
Submitter	: Cédric Godin <cedric@belbone.be>
Date		: 2008-12-04 14:26 (10 days old)
First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=52440211dcdc52c0b757f8b34d122e11b12cdd50
References	: http://marc.info/?l=linux-kernel&m=122840082828098&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12160
Subject		: networking oops after resume from s2ram (2.6.28-rc6)
Submitter	: Marcin Slusarz <marcin.slusarz@gmail.com>
Date		: 2008-11-28 21:15 (16 days old)
References	: http://marc.info/?l=linux-kernel&m=122790701615723&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12159
Subject		: 2.6.28-rc6-git1 -- No sound produced from Intel HDA ALSA driver
Submitter	: Miles Lane <miles.lane@gmail.com>
Date		: 2008-11-27 20:33 (17 days old)
References	: http://marc.info/?l=linux-kernel&m=122781805620212&w=4
Handled-By	: Takashi Iwai <tiwai@suse.de>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12156
Subject		: v2.6.28-rc2: x86_32 relocation regression?
Submitter	: Vegard Nossum <vegard.nossum@gmail.com>
Date		: 2008-11-24 21:19 (20 days old)
References	: http://marc.info/?l=linux-kernel&m=122756158220966&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12155
Subject		: Regression in 2.6.28-rc and 2.6.27-stable - hibernate related
Submitter	: Fabio Comolli <fabio.comolli@gmail.com>
Date		: 2008-11-23 16:17 (21 days old)
References	: http://marc.info/?l=linux-kernel&m=122745709926361&w=4


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12100
Subject		: resume (S2R) broken by Intel microcode module, on A110L
Submitter	: Andreas Mohr <andi@lisas.de>
Date		: 2008-11-25 08:48 (19 days old)
Handled-By	: Dmitry Adamushko <dmitry.adamushko@gmail.com>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12061
Subject		: snd_hda_intel: power_save: sound cracks on powerdown
Submitter	: Jens Weibler <bugzilla-kernel@jensthebrain.de>
Date		: 2008-11-18 12:07 (26 days old)
Handled-By	: Takashi Iwai <tiwai@suse.de>


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12028
Subject		: i915 DRM is broken in 2.6.28-rc4
Submitter	: Adam Tkac <vonsch@gmail.com>
Date		: 2008-11-14 01:50 (30 days old)


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=11849
Subject		: default IRQ affinity change in v2.6.27 (breaking several SMP PPC based systems)
Submitter	: Kumar Gala <galak@kernel.crashing.org>
Date		: 2008-10-24 12:45 (51 days old)
References	: http://marc.info/?l=linux-kernel&m=122485245924125&w=4


Regressions with patches
------------------------

Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12047
Subject		: ACPI toshiba: only register rfkill if bt is enabled
Submitter	: Andrey Borzenkov <arvidjaar@mail.ru>
Date		: 2008-10-28 19:10 (47 days old)
References	: http://marc.info/?l=linux-kernel&m=122522113619025&w=2
Handled-By	: Frederik Deweerdt <frederik.deweerdt@gmail.com>
Patch		: http://marc.info/?l=linux-kernel&m=122526843117478&w=2


For details, please visit the bug entries and follow the links given in
references.

As you can see, there is a Bugzilla entry for each of the listed regressions.
There also is a Bugzilla entry used for tracking the regressions from 2.6.27,
unresolved as well as resolved, at:

http://bugzilla.kernel.org/show_bug.cgi?id=11808

Please let me know if there are any Bugzilla entries that should be added to
the list in there.

Thanks,
Rafael

[Bug #12208] uml is very slow on 2.6.28 host

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of recent regressions.

The following bug entry is on the current list of known regressions
from 2.6.27.  Please verify if it still should be listed and let me know
(either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
Subject		: uml is very slow on 2.6.28 host
Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
Date		: 2008-12-12 9:35 (2 days old)
References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4

Re: [Bug #12208] uml is very slow on 2.6.28 host

[Miklos Szeredi]

On Sat, 13 Dec 2008, Rafael J. Wysocki wrote:
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
> Subject		: uml is very slow on 2.6.28 host
> Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
> Date		: 2008-12-12 9:35 (2 days old)
> References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4

I did a bisection, and this is the commit which is responsible:

  commit 464b75273f64be7c81fee975bd6ca9593df3427b
  Author: Peter Zijlstra <a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>
  Date:   Fri Oct 24 11:06:15 2008 +0200
  
      sched: re-instate vruntime based wakeup preemption
  
      The advantage is that vruntime based wakeup preemption has a better
      conceptual model. Here wakeup_gran = 0 means: preempt when 'fair'.
      Therefore wakeup_gran is the granularity of unfairness we allow in order
      to make progress.
  
      Signed-off-by: Peter Zijlstra <a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>
      Acked-by: Mike Galbraith <efault-Mmb7MZpHnFY@public.gmane.org>
      Signed-off-by: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>

Miklos

Re: [Bug #12208] uml is very slow on 2.6.28 host

[Mike Galbraith]

On Tue, 2008-12-16 at 01:49 +0100, Miklos Szeredi wrote:
> On Sat, 13 Dec 2008, Rafael J. Wysocki wrote:
> > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
> > Subject		: uml is very slow on 2.6.28 host
> > Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
> > Date		: 2008-12-12 9:35 (2 days old)
> > References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4
> 
> I did a bisection, and this is the commit which is responsible:
> 
>   commit 464b75273f64be7c81fee975bd6ca9593df3427b
>   Author: Peter Zijlstra <a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>
>   Date:   Fri Oct 24 11:06:15 2008 +0200
>   
>       sched: re-instate vruntime based wakeup preemption
>   
>       The advantage is that vruntime based wakeup preemption has a better
>       conceptual model. Here wakeup_gran = 0 means: preempt when 'fair'.
>       Therefore wakeup_gran is the granularity of unfairness we allow in order
>       to make progress.
>   
>       Signed-off-by: Peter Zijlstra <a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>
>       Acked-by: Mike Galbraith <efault-Mmb7MZpHnFY@public.gmane.org>
>       Signed-off-by: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>

If that commit is responsible, then it should also be very slow in pre
28 kernels, where the same exists.  Hm, there's another possibility.
Can you try echo NO_LAST_BUDDY > /sys/kernel/debug/sched_features?

	-Mike

Re: [Bug #12208] uml is very slow on 2.6.28 host

[Miklos Szeredi]

On Tue, 16 Dec 2008, Mike Galbraith wrote:
> On Tue, 2008-12-16 at 01:49 +0100, Miklos Szeredi wrote:
> > On Sat, 13 Dec 2008, Rafael J. Wysocki wrote:
> > > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
> > > Subject		: uml is very slow on 2.6.28 host
> > > Submitter	: Miklos Szeredi <miklos-sUDqSbJrdHQHWmgEVkV9KA@public.gmane.org>
> > > Date		: 2008-12-12 9:35 (2 days old)
> > > References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4
> > 
> > I did a bisection, and this is the commit which is responsible:
> > 
> >   commit 464b75273f64be7c81fee975bd6ca9593df3427b
> >   Author: Peter Zijlstra <a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>
> >   Date:   Fri Oct 24 11:06:15 2008 +0200
> >   
> >       sched: re-instate vruntime based wakeup preemption
> >   
> >       The advantage is that vruntime based wakeup preemption has a better
> >       conceptual model. Here wakeup_gran = 0 means: preempt when 'fair'.
> >       Therefore wakeup_gran is the granularity of unfairness we allow in order
> >       to make progress.
> >   
> >       Signed-off-by: Peter Zijlstra <a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>
> >       Acked-by: Mike Galbraith <efault-Mmb7MZpHnFY@public.gmane.org>
> >       Signed-off-by: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>
> 
> If that commit is responsible, then it should also be very slow in pre
> 28 kernels, where the same exists.

Everything prior to 2.6.28 was fine in this respect, so there must be
some subtle difference.

>   Hm, there's another possibility.
> Can you try echo NO_LAST_BUDDY > /sys/kernel/debug/sched_features?

It didn't help, unfortunately.

Applying this patch on top of latest git (which essentially reverts
the above commit) fixes the slowness.

Thanks,
Miklos


---
 kernel/sched_fair.c |   98 +++-------------------------------------------------
 1 file changed, 6 insertions(+), 92 deletions(-)

Index: linux.git/kernel/sched_fair.c
===================================================================
--- linux.git.orig/kernel/sched_fair.c	2008-12-16 01:34:26.000000000 +0100
+++ linux.git/kernel/sched_fair.c	2008-12-16 01:34:54.000000000 +0100
@@ -143,49 +143,6 @@ static inline struct sched_entity *paren
 	return se->parent;
 }
 
-/* return depth at which a sched entity is present in the hierarchy */
-static inline int depth_se(struct sched_entity *se)
-{
-	int depth = 0;
-
-	for_each_sched_entity(se)
-		depth++;
-
-	return depth;
-}
-
-static void
-find_matching_se(struct sched_entity **se, struct sched_entity **pse)
-{
-	int se_depth, pse_depth;
-
-	/*
-	 * preemption test can be made between sibling entities who are in the
-	 * same cfs_rq i.e who have a common parent. Walk up the hierarchy of
-	 * both tasks until we find their ancestors who are siblings of common
-	 * parent.
-	 */
-
-	/* First walk up until both entities are at same depth */
-	se_depth = depth_se(*se);
-	pse_depth = depth_se(*pse);
-
-	while (se_depth > pse_depth) {
-		se_depth--;
-		*se = parent_entity(*se);
-	}
-
-	while (pse_depth > se_depth) {
-		pse_depth--;
-		*pse = parent_entity(*pse);
-	}
-
-	while (!is_same_group(*se, *pse)) {
-		*se = parent_entity(*se);
-		*pse = parent_entity(*pse);
-	}
-}
-
 #else	/* CONFIG_FAIR_GROUP_SCHED */
 
 static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
@@ -236,11 +193,6 @@ static inline struct sched_entity *paren
 	return NULL;
 }
 
-static inline void
-find_matching_se(struct sched_entity **se, struct sched_entity **pse)
-{
-}
-
 #endif	/* CONFIG_FAIR_GROUP_SCHED */
 
 
@@ -1291,8 +1243,8 @@ static unsigned long wakeup_gran(struct
 	 * More easily preempt - nice tasks, while not making it harder for
 	 * + nice tasks.
 	 */
-	if (!sched_feat(ASYM_GRAN) || se->load.weight > NICE_0_LOAD)
-		gran = calc_delta_fair(sysctl_sched_wakeup_granularity, se);
+	if (sched_feat(ASYM_GRAN))
+		gran = calc_delta_mine(gran, NICE_0_LOAD, &se->load);
 
 	return gran;
 }
@@ -1345,6 +1268,7 @@ static void check_preempt_wakeup(struct
 {
 	struct task_struct *curr = rq->curr;
 	struct sched_entity *se = &curr->se, *pse = &p->se;
+	s64 delta_exec;
 
 	if (unlikely(rt_prio(p->prio))) {
 		struct cfs_rq *cfs_rq = task_cfs_rq(curr);
@@ -1398,19 +1322,9 @@ static void check_preempt_wakeup(struct
 		return;
 	}
 
-	find_matching_se(&se, &pse);
-
-	while (se) {
-		BUG_ON(!pse);
-
-		if (wakeup_preempt_entity(se, pse) == 1) {
-			resched_task(curr);
-			break;
-		}
-
-		se = parent_entity(se);
-		pse = parent_entity(pse);
-	}
+	delta_exec = se->sum_exec_runtime - se->prev_sum_exec_runtime;
+	if (delta_exec > wakeup_gran(pse))
+		resched_task(curr);
 }
 
 static struct task_struct *pick_next_task_fair(struct rq *rq)

Re: [Bug #12208] uml is very slow on 2.6.28 host

[Mike Galbraith]

On Tue, 2008-12-16 at 11:26 +0100, Miklos Szeredi wrote:
> On Tue, 16 Dec 2008, Mike Galbraith wrote:

> > If that commit is responsible, then it should also be very slow in pre
> > 28 kernels, where the same exists.
> 
> Everything prior to 2.6.28 was fine in this respect, so there must be
> some subtle difference.

Yeah, strange.

> >   Hm, there's another possibility.
> > Can you try echo NO_LAST_BUDDY > /sys/kernel/debug/sched_features?
> 
> It didn't help, unfortunately.

I'm happy to hear that actually.

> Applying this patch on top of latest git (which essentially reverts
> the above commit) fixes the slowness.

We definitely don't want to do that.  Hm.  There are only two commits
that spring to mind...

1af5f730fc1bf7c62ec9fb2d307206e18bf40a69, which is another hope not, and
3f3a490480d8ab96e0fe30a41f80f14e6a0c579d which doesn't seem likely.

	-Mike

Re: [Bug #12208] uml is very slow on 2.6.28 host

[Miklos Szeredi]

On Tue, 16 Dec 2008, Mike Galbraith wrote:
> We definitely don't want to do that.  Hm.  There are only two commits
> that spring to mind...
> 
> 1af5f730fc1bf7c62ec9fb2d307206e18bf40a69, which is another hope not, and

This didn't fix it either.

> 3f3a490480d8ab96e0fe30a41f80f14e6a0c579d which doesn't seem likely.

This can't be reverted on latest git.

Is there a way to trace what is happening in the scheduler?

Thanks,
Miklos

Re: [Bug #12208] uml is very slow on 2.6.28 host

[Mike Galbraith]

[-- Attachment #1: Type: text/plain, Size: 436 bytes --]

On Tue, 2008-12-16 at 16:27 +0100, Miklos Szeredi wrote:

> Is there a way to trace what is happening in the scheduler?

Sure.  Ingo has a script for gathering info (attached), if you run it,
please gzip up the output and send me a copy offline to eyeball.

There's also ftrace, but I've not tried that yet, so can't offer any
advice, I use primitive but effective time_after() + printk() with klogd
wakeup disabled (deadlock).

	-Mike

[-- Attachment #2: cfs-debug-info.sh --]
[-- Type: application/x-shellscript, Size: 3559 bytes --]

Re: [Bug #12208] uml is very slow on 2.6.28 host

[Ingo Molnar]

* Mike Galbraith <efault-Mmb7MZpHnFY@public.gmane.org> wrote:

> On Tue, 2008-12-16 at 16:27 +0100, Miklos Szeredi wrote:
> 
> > Is there a way to trace what is happening in the scheduler?
> 
> Sure.  Ingo has a script for gathering info (attached), if you run it, 
> please gzip up the output and send me a copy offline to eyeball.
> 
> There's also ftrace, but I've not tried that yet, so can't offer any 
> advice, I use primitive but effective time_after() + printk() with klogd 
> wakeup disabled (deadlock).

btw., there's a recent commit:

  32a7600: printk: make printk more robust by not allowing recursion

since then printk shouldnt deadlock anymore, even if called from within 
the scheduler.

Btw., ftrace_printk() can be used similarly (and you can capture it 
nonstop via /debug/tracing/trace_pipe), and should not deadlock either.

	Ingo

Re: [Bug #12208] uml is very slow on 2.6.28 host

[Peter Zijlstra]

On Tue, 2008-12-16 at 01:49 +0100, Miklos Szeredi wrote:
> On Sat, 13 Dec 2008, Rafael J. Wysocki wrote:
> > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12208
> > Subject		: uml is very slow on 2.6.28 host
> > Submitter	: Miklos Szeredi <miklos@szeredi.hu>
> > Date		: 2008-12-12 9:35 (2 days old)
> > References	: http://marc.info/?l=linux-kernel&m=122907463518593&w=4
> 
> I did a bisection, and this is the commit which is responsible:
> 
>   commit 464b75273f64be7c81fee975bd6ca9593df3427b
>   Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
>   Date:   Fri Oct 24 11:06:15 2008 +0200
>   
>       sched: re-instate vruntime based wakeup preemption
>   
>       The advantage is that vruntime based wakeup preemption has a better
>       conceptual model. Here wakeup_gran = 0 means: preempt when 'fair'.
>       Therefore wakeup_gran is the granularity of unfairness we allow in order
>       to make progress.
>   
>       Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
>       Acked-by: Mike Galbraith <efault@gmx.de>
>       Signed-off-by: Ingo Molnar <mingo@elte.hu>

How's 27? That code basically makes .28 do what .27 did, we tried
something else for a little while and that made stuff suck rocks.