[1/3] 2.6.22-rc3: known regressions v2

[1/3] 2.6.22-rc3: known regressions v2

[Michal Piotrowski]

Hi all,

Here is a list of some known regressions in 2.6.22-rc3.

Feel free to add new regressions/remove fixed etc.
http://kernelnewbies.org/known_regressions



Unclassified

Subject    : build failed in function `vic_sys_interrupt'
References : http://lkml.org/lkml/2007/5/31/227
Submitter  : Toralf Förster <toralf.foerster@gmx.de>
Status     : Unknown

Subject    : long freezes on thinkpad t60
References : http://lkml.org/lkml/2007/5/24/100
Submitter  : Miklos Szeredi <miklos@szeredi.hu>
Handled-By : Ingo Molnar <mingo@elte.hu>
Status     : problem is being debugged



ACPI

Subject    : unable to shutdown on kernel 2.6.22-rc2
References : http://bugzilla.kernel.org/show_bug.cgi?id=8516
Submitter  : Thierry Volpiatto <tvolpiatt@neuf.fr>
Status     : Unknown



ALSA

Subject    : snd-aoa causes badness in lib/kref.c:33
References : http://bugzilla.kernel.org/show_bug.cgi?id=8513
Submitter  : Ben Collins <bcollins@ubuntu.com>
Status     : Unknown



Networking

Subject    : b44: regression in 2.6.22
References : http://lkml.org/lkml/2007/5/27/108
Submitter  : Maximilian Engelhardt <maxi@daemonizer.de>
Handled-By : Michael Buesch <mb@bu3sch.de>
Status     : problem is being debugged



Regards,
Michal

--
"Najbardziej brakowało mi twojego milczenia."
-- Andrzej Sapkowski "Coś więcej"

Re: [1/3] 2.6.22-rc3: known regressions v2

[Miklos Szeredi]

> Subject    : long freezes on thinkpad t60
> References : http://lkml.org/lkml/2007/5/24/100
> Submitter  : Miklos Szeredi <miklos@szeredi.hu>
> Handled-By : Ingo Molnar <mingo@elte.hu>
> Status     : problem is being debugged

This isn't a regression strictly speaking, as 2.6.21 is known to be
affected, and older kernels might also be.

It's non-fatal and only happens under very special circumstances, so
it's definitely not a showstopper.

I don't mind being bugged about this once in a while, this is just for
clarification.

Miklos

Re: [1/3] 2.6.22-rc3: known regressions v2

[Ingo Molnar]

* Miklos Szeredi <miklos@szeredi.hu> wrote:

> > Subject    : long freezes on thinkpad t60
> > References : http://lkml.org/lkml/2007/5/24/100
> > Submitter  : Miklos Szeredi <miklos@szeredi.hu>
> > Handled-By : Ingo Molnar <mingo@elte.hu>
> > Status     : problem is being debugged
> 
> This isn't a regression strictly speaking, as 2.6.21 is known to be 
> affected, and older kernels might also be.
> 
> It's non-fatal and only happens under very special circumstances, so 
> it's definitely not a showstopper.
> 
> I don't mind being bugged about this once in a while, this is just for 
> clarification.

i have no better ideas that what you already tried - but unfortunately 
the tracer makes the bug go away and the NMI watchdog crashes your box. 
Btw., nmi_watchdog=2 might have a higher chance of surviving (it can 
still lock up a T60 but with a lower likelyhood).

	Ingo

Re: [1/3] 2.6.22-rc3: known regressions v2

[Miklos Szeredi]

> i have no better ideas that what you already tried - but unfortunately 
> the tracer makes the bug go away and the NMI watchdog crashes your box. 
> Btw., nmi_watchdog=2 might have a higher chance of surviving (it can 
> still lock up a T60 but with a lower likelyhood).

Good tip, nmi_watchdog=2 worked.  Unlike the previous freezes, after
this one it didn't continue after some minutes.  Don't know if that's
because the NMI oopser changed something, or if this is a slightly
different lockup...

No serial port on this laptop, so screenshot done with digicam:

  http://www.kernel.org/pub/linux/kernel/people/mszeredi/freeze/nmioops.jpg

Here are the transcribed stack traces:

CPU1
process: strace
 _spin_lock
 task_rq_lock
 wait_task_inactive
 ptrace_check_attach
 sys_ptrace

CPU0
process: fusexmp_fh (this is one of several similar threads being straced)
 _spin_lock_irq
 schedule
 ptrace_stop
 ptrace_notify
 syscall_trace
 syscall_trace_enter
 tracesys

Both these seem to be spinning on rq->lock, but who is holding this
lock?

Miklos

Re: [1/3] 2.6.22-rc3: known regressions v2

[Jeff Chua]

On 6/2/07, Michal Piotrowski <michal.k.k.piotrowski@gmail.com> wrote:

> I think that Sam is working on this.

I'm a bit lost looking at those patches and don't know which ones are
the appropriate ones I should I apply?

Thanks,
Jeff.

Re: [1/3] 2.6.22-rc3: known regressions v2

[Sam Ravnborg]

On Sat, Jun 02, 2007 at 12:43:06AM +0800, Jeff Chua wrote:
> On 6/2/07, Michal Piotrowski <michal.k.k.piotrowski@gmail.com> wrote:
> 
> >I think that Sam is working on this.
> 
> I'm a bit lost looking at those patches and don't know which ones are
> the appropriate ones I should I apply?
The fix is in -mm and sent to Andi.
So it will likely be merged soon.

I recommemd to ignore the warnings for now.

	Sam

Re: [1/3] 2.6.22-rc3: known regressions v2

[Jeff Chua]

On 6/2/07, Sam Ravnborg <sam@ravnborg.org> wrote:

> The fix is in -mm and sent to Andi.
> So it will likely be merged soon.
>
> I recommemd to ignore the warnings for now.

Thanks, I'll check when the next rc4 is ready.

Jeff.

Re: [1/3] 2.6.22-rc3: known regressions v2

[Michael Buesch]

On Friday 01 June 2007 14:20:44 Michal Piotrowski wrote:
> Networking
> 
> Subject    : b44: regression in 2.6.22
> References : http://lkml.org/lkml/2007/5/27/108
> Submitter  : Maximilian Engelhardt <maxi@daemonizer.de>
> Handled-By : Michael Buesch <mb@bu3sch.de>

Well, it looks like a highres-timers problem or something
like that. So I can't really be handling that, as I have no
clue about this.
I suggest you also add Gary Zambrano <zambrano@broadcom.com>
here, as he is actually the maintainer of b44. Not me.
My role was just helping in debugging the issue, as I know
some details of b44.

> Status     : problem is being debugged



-- 
Greetings Michael.

Re: [1/3] 2.6.22-rc3: known regressions v2

[Randy Dunlap]

On Fri, 01 Jun 2007 14:20:44 +0200 Michal Piotrowski wrote:

> Hi all,
> 
> Here is a list of some known regressions in 2.6.22-rc3.
> 
> Feel free to add new regressions/remove fixed etc.
> http://kernelnewbies.org/known_regressions
> 
> 
> Unclassified
> 
> Subject    : build failed in function `vic_sys_interrupt'
> References : http://lkml.org/lkml/2007/5/31/227
> Submitter  : Toralf Förster <toralf.foerster@gmx.de>
> Status     : Unknown

I probably wouldn't call a randconfig build problem a regression.

James, does Voyager support SMP=n now?


---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***

Re: [1/3] 2.6.22-rc3: known regressions v2

[James Bottomley]

On Sat, 2007-06-02 at 16:13 -0700, Randy Dunlap wrote:
> On Fri, 01 Jun 2007 14:20:44 +0200 Michal Piotrowski wrote:
> 
> > Hi all,
> > 
> > Here is a list of some known regressions in 2.6.22-rc3.
> > 
> > Feel free to add new regressions/remove fixed etc.
> > http://kernelnewbies.org/known_regressions
> > 
> > 
> > Unclassified
> > 
> > Subject    : build failed in function `vic_sys_interrupt'
> > References : http://lkml.org/lkml/2007/5/31/227
> > Submitter  : Toralf Förster <toralf.foerster@gmx.de>
> > Status     : Unknown
> 
> I probably wouldn't call a randconfig build problem a regression.
> 
> James, does Voyager support SMP=n now?

No, this is a longstanding bug that I keep meaning to find time to fix.

James