[1/3] 2.6.21-rc7: known regressions (v2)

[1/3] 2.6.21-rc7: known regressions (v2)

[Adrian Bunk]

This email lists some known regressions in Linus' tree compared to 2.6.20.

If you find your name in the Cc header, you are either submitter of one
of the bugs, maintainer of an affectected subsystem or driver, a patch
of you caused a breakage or I'm considering you in any other way
possibly involved with one or more of these issues.

Due to the huge amount of recipients, please trim the Cc when answering.


Subject    : gammu no longer works
References : http://lkml.org/lkml/2007/4/20/84
Submitter  : Wolfgang Erig <Wolfgang.Erig@gmx.de>
Status     : unknown


Subject    : hal daemon crashes after pulling a USB serial device
References : http://www.opensubscriber.com/message/linux-usb-devel@lists.sourceforge.net/6369800.html
Submitter  : Andi Kleen <ak@suse.de>
Handled-By : Oliver Neukum <oneukum@suse.de>
Status     : problem is being debugged


Subject    : Oops when changing USB DVB-T adapter
References : http://lkml.org/lkml/2007/3/9/212
             http://lkml.org/lkml/2007/4/5/154
Submitter  : CIJOML <cijoml@volny.cz>
Handled-By : Markus Rechberger <markus.rechberger@amd.com>
Status     : patches available


Subject    : snd_hda_intel doesn't work with ASUS M2V mainboard
References : http://bugzilla.kernel.org/show_bug.cgi?id=8273
Submitter  : Hans-Georg Rist <hg.rist@web.de>
Status     : unknown


Subject    : snd_intel8x0: divide error: 0000
References : http://lkml.org/lkml/2007/3/5/252
Submitter  : Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Handled-By : Takashi Iwai <tiwai@suse.de>
Patch      : http://lkml.org/lkml/2007/4/20/117
Status     : patch available

Re: [1/3] 2.6.21-rc7: known regressions (v2)

[Greg KH]

On Mon, Apr 23, 2007 at 11:48:47PM +0200, Adrian Bunk wrote:
> This email lists some known regressions in Linus' tree compared to 2.6.20.
> 
> If you find your name in the Cc header, you are either submitter of one
> of the bugs, maintainer of an affectected subsystem or driver, a patch
> of you caused a breakage or I'm considering you in any other way
> possibly involved with one or more of these issues.
> 
> Due to the huge amount of recipients, please trim the Cc when answering.
> 
> 
> Subject    : gammu no longer works
> References : http://lkml.org/lkml/2007/4/20/84
> Submitter  : Wolfgang Erig <Wolfgang.Erig@gmx.de>
> Status     : unknown

I've asked for more information about this, and so far am not sure it's
a real problem.

thanks,

greg k-h

Re: [1/3] 2.6.21-rc7: known regressions (v2)

[Wolfgang Erig]

On Mon, Apr 23, 2007 at 03:18:19PM -0700, Greg KH wrote:
> On Mon, Apr 23, 2007 at 11:48:47PM +0200, Adrian Bunk wrote:
> > This email lists some known regressions in Linus' tree compared to 2.6.20.
> > 
> > If you find your name in the Cc header, you are either submitter of one
> > of the bugs, maintainer of an affectected subsystem or driver, a patch
> > of you caused a breakage or I'm considering you in any other way
> > possibly involved with one or more of these issues.
> > 
> > Due to the huge amount of recipients, please trim the Cc when answering.
> > 
> > 
> > Subject    : gammu no longer works
> > References : http://lkml.org/lkml/2007/4/20/84
> > Submitter  : Wolfgang Erig <Wolfgang.Erig@gmx.de>
> > Status     : unknown
> 
> I've asked for more information about this, and so far am not sure it's
> a real problem.

It is a real problem for me.
I tried this on 2 different boxes with the same behaviour.
No sync between my Nokia mobile and Linux with the latest kernel :(

Which additional information is useful for this problem?

Wolfgang


$ gammu textall --backup backup
Press Ctrl+C to break...
[Gammu            - 1.10.0 built 10:15:07 Mar 13 2007 in gcc 4.1]
[Connection       - "fbuspl2303"]
[Model type       - "3100"]
[Device           - "/dev/ttyUSB0"]
[Run on           - Linux, kernel 2.6.21-rc7-g80d74d51 (#9 SMP Wed Apr 18 21:41:41 CEST 2007)]
[Module           - "1100|1100a|1100b|2650|3100|3100b|3105|3108|3200|3200a|3205|3220|3300|3510|3510i|3530|3589i|3590|3595|5100|5140|5140i|6020|6021|6030|6100|6101|6103|6111|6125|6131|6170|6200|6220|6230|6230i|6233|6234|6270|6280|6310|6310i|6385|6510|6610|6610i|6800|6810|6820|6822|7200|7210|7250|7250i|7260|7270|7360|7370|7600|8310|8390|8910|8910i"]
Setting speed to 19200
I/O possible

Re: [1/3] 2.6.21-rc7: known regressions (v2)

[Michal Čihař]

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Hi

On Tue, 24 Apr 2007 08:26:00 -0700
michal@cihar.com wrote:

> Adrian Bunk napsal:
> > Subject    : gammu no longer works
> > References : http://lkml.org/lkml/2007/4/20/84
> > Submitter  : Wolfgang Erig <Wolfgang.Erig@gmx.de>
> > Status     : unknown
> 
> As several people reported this issue to me, I debugged gammu and here
> are details: This is caused by setting fcntl(filehandle, F_SETFL,
> FASYNC). Consequent write(filehandle, ...) generate SIGIO, which end
> application. I'm still investigating why FASYNC was there and whether
> it is really needed, but it worked with it for ages (this code is
> there at least since 2004 where my VCS history ends).

Reply to myself... At the end it turned out that Gammu wrongly sets
async I/O while it doesn't want it and does not handle it. Till now no
driver which has been used didn't support it, so this issue has not been
caught. I just removed this code from Gammu, so this is IMHO not a
kernel regression.

PS: Please CC me on reply, I'm not subscribed.

-- 
	Michal Čihař | http://cihar.com | http://blog.cihar.com

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Re: [1/3] 2.6.21-rc7: known regressions (v2)

[Greg KH]

On Tue, Apr 24, 2007 at 11:32:53AM +0200, Wolfgang Erig wrote:
> On Mon, Apr 23, 2007 at 03:18:19PM -0700, Greg KH wrote:
> > On Mon, Apr 23, 2007 at 11:48:47PM +0200, Adrian Bunk wrote:
> > > This email lists some known regressions in Linus' tree compared to 2.6.20.
> > > 
> > > If you find your name in the Cc header, you are either submitter of one
> > > of the bugs, maintainer of an affectected subsystem or driver, a patch
> > > of you caused a breakage or I'm considering you in any other way
> > > possibly involved with one or more of these issues.
> > > 
> > > Due to the huge amount of recipients, please trim the Cc when answering.
> > > 
> > > 
> > > Subject    : gammu no longer works
> > > References : http://lkml.org/lkml/2007/4/20/84
> > > Submitter  : Wolfgang Erig <Wolfgang.Erig@gmx.de>
> > > Status     : unknown
> > 
> > I've asked for more information about this, and so far am not sure it's
> > a real problem.
> 
> It is a real problem for me.
> I tried this on 2 different boxes with the same behaviour.
> No sync between my Nokia mobile and Linux with the latest kernel :(

Sorry, I didn't see your response, have followed up on lkml now.

thanks,

greg k-h

Re: [1/3] 2.6.21-rc7: known regressions (v2)

[Adrian Bunk]

On Tue, Apr 24, 2007 at 05:14:28PM -0700, Greg KH wrote:
> On Tue, Apr 24, 2007 at 11:32:53AM +0200, Wolfgang Erig wrote:
> > On Mon, Apr 23, 2007 at 03:18:19PM -0700, Greg KH wrote:
> > > On Mon, Apr 23, 2007 at 11:48:47PM +0200, Adrian Bunk wrote:
> > > > This email lists some known regressions in Linus' tree compared to 2.6.20.
> > > > 
> > > > If you find your name in the Cc header, you are either submitter of one
> > > > of the bugs, maintainer of an affectected subsystem or driver, a patch
> > > > of you caused a breakage or I'm considering you in any other way
> > > > possibly involved with one or more of these issues.
> > > > 
> > > > Due to the huge amount of recipients, please trim the Cc when answering.
> > > > 
> > > > 
> > > > Subject    : gammu no longer works
> > > > References : http://lkml.org/lkml/2007/4/20/84
> > > > Submitter  : Wolfgang Erig <Wolfgang.Erig@gmx.de>
> > > > Status     : unknown
> > > 
> > > I've asked for more information about this, and so far am not sure it's
> > > a real problem.
> > 
> > It is a real problem for me.
> > I tried this on 2 different boxes with the same behaviour.
> > No sync between my Nokia mobile and Linux with the latest kernel :(
> 
> Sorry, I didn't see your response, have followed up on lkml now.

It turned out this was actually a bug in Gammu that will be fixed in 
the next release of Gammu.

> thanks,
> 
> greg k-h

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

Re: [1/3] 2.6.21-rc7: known regressions (v2)

[Greg KH]

On Wed, Apr 25, 2007 at 02:29:58AM +0200, Adrian Bunk wrote:
> On Tue, Apr 24, 2007 at 05:14:28PM -0700, Greg KH wrote:
> > On Tue, Apr 24, 2007 at 11:32:53AM +0200, Wolfgang Erig wrote:
> > > On Mon, Apr 23, 2007 at 03:18:19PM -0700, Greg KH wrote:
> > > > On Mon, Apr 23, 2007 at 11:48:47PM +0200, Adrian Bunk wrote:
> > > > > This email lists some known regressions in Linus' tree compared to 2.6.20.
> > > > > 
> > > > > If you find your name in the Cc header, you are either submitter of one
> > > > > of the bugs, maintainer of an affectected subsystem or driver, a patch
> > > > > of you caused a breakage or I'm considering you in any other way
> > > > > possibly involved with one or more of these issues.
> > > > > 
> > > > > Due to the huge amount of recipients, please trim the Cc when answering.
> > > > > 
> > > > > 
> > > > > Subject    : gammu no longer works
> > > > > References : http://lkml.org/lkml/2007/4/20/84
> > > > > Submitter  : Wolfgang Erig <Wolfgang.Erig@gmx.de>
> > > > > Status     : unknown
> > > > 
> > > > I've asked for more information about this, and so far am not sure it's
> > > > a real problem.
> > > 
> > > It is a real problem for me.
> > > I tried this on 2 different boxes with the same behaviour.
> > > No sync between my Nokia mobile and Linux with the latest kernel :(
> > 
> > Sorry, I didn't see your response, have followed up on lkml now.
> 
> It turned out this was actually a bug in Gammu that will be fixed in 
> the next release of Gammu.

Ah, ok, thanks for letting me know.

But how was the kernel version change triggering it?

greg k-h

Re: [1/3] 2.6.21-rc7: known regressions (v2)

[Adrian Bunk]

On Tue, Apr 24, 2007 at 05:51:11PM -0700, Greg KH wrote:
> On Wed, Apr 25, 2007 at 02:29:58AM +0200, Adrian Bunk wrote:
> > On Tue, Apr 24, 2007 at 05:14:28PM -0700, Greg KH wrote:
> > > On Tue, Apr 24, 2007 at 11:32:53AM +0200, Wolfgang Erig wrote:
> > > > On Mon, Apr 23, 2007 at 03:18:19PM -0700, Greg KH wrote:
> > > > > On Mon, Apr 23, 2007 at 11:48:47PM +0200, Adrian Bunk wrote:
> > > > > > This email lists some known regressions in Linus' tree compared to 2.6.20.
> > > > > > 
> > > > > > If you find your name in the Cc header, you are either submitter of one
> > > > > > of the bugs, maintainer of an affectected subsystem or driver, a patch
> > > > > > of you caused a breakage or I'm considering you in any other way
> > > > > > possibly involved with one or more of these issues.
> > > > > > 
> > > > > > Due to the huge amount of recipients, please trim the Cc when answering.
> > > > > > 
> > > > > > 
> > > > > > Subject    : gammu no longer works
> > > > > > References : http://lkml.org/lkml/2007/4/20/84
> > > > > > Submitter  : Wolfgang Erig <Wolfgang.Erig@gmx.de>
> > > > > > Status     : unknown
> > > > > 
> > > > > I've asked for more information about this, and so far am not sure it's
> > > > > a real problem.
> > > > 
> > > > It is a real problem for me.
> > > > I tried this on 2 different boxes with the same behaviour.
> > > > No sync between my Nokia mobile and Linux with the latest kernel :(
> > > 
> > > Sorry, I didn't see your response, have followed up on lkml now.
> > 
> > It turned out this was actually a bug in Gammu that will be fixed in 
> > the next release of Gammu.
> 
> Ah, ok, thanks for letting me know.
> 
> But how was the kernel version change triggering it?

I don't know, perhaps a side effect of Eric's work in kernel/signal.c?

The bug in Gammu was:
- Gammu wrongly set FASYNC in a fcntl() call.
- The unhandled SIGIO terminated Gammu in 2.6.21-rc.

Gammu being terminated by the SIGIO seems to be expected and documented 
behavior, and the surprising thing is that it wasn't terminated with 
earlier kernels.

> greg k-h

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

Re: [1/3] 2.6.21-rc7: known regressions (v2)

[Eric W. Biederman]

Adrian Bunk <bunk@stusta.de> writes:

> On Tue, Apr 24, 2007 at 05:51:11PM -0700, Greg KH wrote:
>> On Wed, Apr 25, 2007 at 02:29:58AM +0200, Adrian Bunk wrote:
>> > On Tue, Apr 24, 2007 at 05:14:28PM -0700, Greg KH wrote:
>> > > On Tue, Apr 24, 2007 at 11:32:53AM +0200, Wolfgang Erig wrote:
>> > > > On Mon, Apr 23, 2007 at 03:18:19PM -0700, Greg KH wrote:
>> > > > > On Mon, Apr 23, 2007 at 11:48:47PM +0200, Adrian Bunk wrote:
>> > > > > > This email lists some known regressions in Linus' tree compared to
> 2.6.20.
>> > > > > > 
>> > > > > > If you find your name in the Cc header, you are either submitter of
> one
>> > > > > > of the bugs, maintainer of an affectected subsystem or driver, a
> patch
>> > > > > > of you caused a breakage or I'm considering you in any other way
>> > > > > > possibly involved with one or more of these issues.
>> > > > > > 
>> > > > > > Due to the huge amount of recipients, please trim the Cc when
> answering.
>> > > > > > 
>> > > > > > 
>> > > > > > Subject    : gammu no longer works
>> > > > > > References : http://lkml.org/lkml/2007/4/20/84
>> > > > > > Submitter  : Wolfgang Erig <Wolfgang.Erig@gmx.de>
>> > > > > > Status     : unknown
>> > > > > 
>> > > > > I've asked for more information about this, and so far am not sure
> it's
>> > > > > a real problem.
>> > > > 
>> > > > It is a real problem for me.
>> > > > I tried this on 2 different boxes with the same behaviour.
>> > > > No sync between my Nokia mobile and Linux with the latest kernel :(
>> > > 
>> > > Sorry, I didn't see your response, have followed up on lkml now.
>> > 
>> > It turned out this was actually a bug in Gammu that will be fixed in 
>> > the next release of Gammu.
>> 
>> Ah, ok, thanks for letting me know.
>> 
>> But how was the kernel version change triggering it?
>
> I don't know, perhaps a side effect of Eric's work in kernel/signal.c?

Perhaps there has been a bit of churn.  Most of what I have done has
been fixing corner cases like not sending a signal to the wrong task,
after our original target has exited.

Although in conjunction with Oleg and some others there has been things
like changing locking to rcu or making locks more local so the timing
may have changed.  Which is make some subtle timing thing my best
guess.  For timing changes just about anything could have triggered
something.

I took a quick glance at the code and I certainly touched some of
the helpers like send_sigio that seem to be called by fasync
processing but I haven't a clue what FASYNC really does.  So I'm
having trouble putting this all into perspective.

I guess it's possible I fixed something without realizing it.


Eric

Re: [1/3] 2.6.21-rc7: known regressions (v2)

[Wolfgang Erig]

On Wed, Apr 25, 2007 at 03:21:53AM +0200, Adrian Bunk wrote:
> On Tue, Apr 24, 2007 at 05:51:11PM -0700, Greg KH wrote:
> > On Wed, Apr 25, 2007 at 02:29:58AM +0200, Adrian Bunk wrote:
> > > On Tue, Apr 24, 2007 at 05:14:28PM -0700, Greg KH wrote:
> > > > On Tue, Apr 24, 2007 at 11:32:53AM +0200, Wolfgang Erig wrote:
> > > > > On Mon, Apr 23, 2007 at 03:18:19PM -0700, Greg KH wrote:
> > > > > > On Mon, Apr 23, 2007 at 11:48:47PM +0200, Adrian Bunk wrote:
> > > > > > > This email lists some known regressions in Linus' tree compared to 2.6.20.
> > > > > > > 
> > > > > > > If you find your name in the Cc header, you are either submitter of one
> > > > > > > of the bugs, maintainer of an affectected subsystem or driver, a patch
> > > > > > > of you caused a breakage or I'm considering you in any other way
> > > > > > > possibly involved with one or more of these issues.
> > > > > > > 
> > > > > > > Due to the huge amount of recipients, please trim the Cc when answering.
> > > > > > > 
> > > > > > > 
> > > > > > > Subject    : gammu no longer works
> > > > > > > References : http://lkml.org/lkml/2007/4/20/84
> > > > > > > Submitter  : Wolfgang Erig <Wolfgang.Erig@gmx.de>
> > > > > > > Status     : unknown
> > > > > > 
> > > > > > I've asked for more information about this, and so far am not sure it's
> > > > > > a real problem.
> > > > > 
> > > > > It is a real problem for me.
> > > > > I tried this on 2 different boxes with the same behaviour.
> > > > > No sync between my Nokia mobile and Linux with the latest kernel :(
> > > > 
> > > > Sorry, I didn't see your response, have followed up on lkml now.
> > > 
> > > It turned out this was actually a bug in Gammu that will be fixed in 
> > > the next release of Gammu.
> > 
> > Ah, ok, thanks for letting me know.
> > 
> > But how was the kernel version change triggering it?
> 
> I don't know, perhaps a side effect of Eric's work in kernel/signal.c?
> 
> The bug in Gammu was:
> - Gammu wrongly set FASYNC in a fcntl() call.
> - The unhandled SIGIO terminated Gammu in 2.6.21-rc.

I tried it: get the source of gammu, remove FASYNC, ... etc.
It works.

Thankyou for the fun,
Wolfgang