Nouveau - Aug 2010 - [Bug 29583] New: nouveau freeze Xorg on NV34

https://bugs.freedesktop.org/show_bug.cgi?id=29583

           Summary: nouveau freeze Xorg on NV34
           Product: xorg
           Version: git
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: drdarkraven at gmail.com
         QAContact: xorg-team at lists.x.org


The bug was first sighted when resize a 'fake transparent' rxvt window.
This action freeze Xorg.
And with some further investigation, I discovered that the bug is reproducible
by running:
 x11perf -compwinwin500
(And it's fine when running x11perf -putimage500)

And not only Xorg is frozen,it seems the whole system is frozen,too.
The cursor can't be moved,and ssh connection is lost.

I'm using a snapshot kernel,the bug appeared after I updated my kernel tree
at
Aug 7.
And there is no such bug in nouveau kernel tree.

Here is my kernel log output.

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DarkRaven <drdarkraven at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|medium                      |high
                 CC|                            |drdarkraven at gmail.com

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--- Comment #1 from DarkRaven <drdarkraven at gmail.com> 2010-08-15
06:46:30 PDT ---
Created an attachment (id=37887)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=37887)
Kernel log

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--- Comment #2 from DarkRaven <drdarkraven at gmail.com> 2010-08-15
06:48:16 PDT ---
Created an attachment (id=37888)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=37888)
Kernel configuration

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Marcin Slusarz <marcin.slusarz at gmail.com> changed:

           What    |Removed                     |Added
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  Attachment #37887|application/octet-stream    |text/plain
          mime type|                            |

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Marcin Slusarz <marcin.slusarz at gmail.com> changed:

           What    |Removed                     |Added
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  Attachment #37888|application/octet-stream    |text/plain
          mime type|                            |

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--- Comment #3 from DarkRaven <drdarkraven at gmail.com> 2010-08-17
01:35:47 PDT ---
Created an attachment (id=37908)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=37908)
Xorg log

After '2.6.36-rc1' is merged into nouveau,the same problem appears with
nouveau
kernel tree.

Here is my xorg.0.log

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DarkRaven <drdarkraven at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #37908|0                           |1
        is obsolete|                            |

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--- Comment #4 from DarkRaven <drdarkraven at gmail.com> 2010-08-17
01:42:38 PDT ---
Created an attachment (id=37909)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=37909)
Xorg log

Sorry,I submitted the wrong one.

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DarkRaven <drdarkraven at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|high                        |highest

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KIMURA Masaru <hiyuh.root at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #37909|application/octet-stream    |text/plain
          mime type|                            |

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--- Comment #5 from DarkRaven <drdarkraven at gmail.com> 2010-08-23
23:40:07 PDT ---
Curious behavior of nouveau driver(though I don't know if it's connect
with
this problem):
Once nouveau driver is loaded,after the screen resolution changed(which is
normal),there is a area,about 640*480 in size,at the top-left corner of the
screen,is totally white.

This behavior started maybe after 2.6.36-rc1

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--- Comment #6 from Francisco Jerez <currojerez at riseup.net> 2010-08-25
15:54:40 PDT ---
(In reply to comment #3)
> Created an attachment (id=37908)
 -->
(https://bugs.freedesktop.org/attachment.cgi?id=37908)
> Xorg log
> 
> After '2.6.36-rc1' is merged into nouveau,the same problem appears
with nouveau
> kernel tree.
> 
You could try to bisect this problem (see "man git-bisect").
> Here is my xorg.0.log
(In reply to comment #5)
> Curious behavior of nouveau driver(though I don't know if it's
connect with
> this problem):
> Once nouveau driver is loaded,after the screen resolution changed(which is
> normal),there is a area,about 640*480 in size,at the top-left corner of the
> screen,is totally white.
> 
> This behavior started maybe after 2.6.36-rc1
That's an unrelated issue, it's already fixed in Andrew Morton's -mm
tree,
commit "vt: fix console corruption on driver hand-over".

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--- Comment #7 from DarkRaven <drdarkraven at gmail.com> 2010-08-25
22:26:27 PDT ---
Bisect result:

58374713c9dfb4d231f8c56cac089f6fbdedc2ec is the first bad commit
commit 58374713c9dfb4d231f8c56cac089f6fbdedc2ec
Author: Arnd Bergmann <arnd at arndb.de>
Date:   Sat Jul 10 23:51:39 2010 +0200

    drm: kill BKL from common code

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--- Comment #8 from Francisco Jerez <currojerez at riseup.net> 2010-08-26
02:26:01 PDT ---
(In reply to comment #7)
> Bisect result:
> 
> 58374713c9dfb4d231f8c56cac089f6fbdedc2ec is the first bad commit
> commit 58374713c9dfb4d231f8c56cac089f6fbdedc2ec
> Author: Arnd Bergmann <arnd at arndb.de>
> Date:   Sat Jul 10 23:51:39 2010 +0200
> 
>     drm: kill BKL from common code
Ben may have fixed this with e644bb2066cc46c01e5f8902bf840f19e1f942c6, could
you try again with latest git?

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--- Comment #9 from DarkRaven <drdarkraven at gmail.com> 2010-08-26
03:01:47 PDT ---
Tried,doesn't fix the bug.

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--- Comment #10 from Ben Skeggs <skeggsb at gmail.com> 2010-08-26 03:20:52
PDT ---
Yeah, I didn't expect my earlier fix to fix this or the other issues that
have
been reported.  They fix another issue I encountered however.  I have been
unable to reproduce these so far, but my kernel has additional changes which
could possible effect things, I will try in more depth tomorrow.

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--- Comment #11 from Francisco Jerez <currojerez at riseup.net> 2010-08-27
05:06:27 PDT ---
You could try to build a kernel with CONFIG_LOCKUP_DETECTOR enabled. The lockup
detector logs a backtrace when the kernel stays stuck for a minute or so. It
may be useful along with a serial/netconsole to track this problem down.

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--- Comment #12 from DarkRaven <drdarkraven at gmail.com> 2010-08-27
05:19:59 PDT ---
The all-is-frozen situation described in the comment only appeared once.
During my bisecting,while Xorg is frozen,I'm still able to move mouse and
network is still working.
So according to the definition of 'Hardlockups':
  Hardlockups are bugs that cause the CPU to loop in kernel mode
  for more than 60 seconds, without letting other interrupts have a
  chance to run.
I don't think this is a hardlockup.

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--- Comment #13 from Francisco Jerez <currojerez at riseup.net> 2010-08-27
05:35:18 PDT ---
(In reply to comment #12)
> The all-is-frozen situation described in the comment only appeared once.
> During my bisecting,while Xorg is frozen,I'm still able to move mouse
and
> network is still working.
> So according to the definition of 'Hardlockups':
>   Hardlockups are bugs that cause the CPU to loop in kernel mode
>   for more than 60 seconds, without letting other interrupts have a
>   chance to run.
> I don't think this is a hardlockup.
Ah! Then CONFIG_DETECT_HUNG_TASK would be more appropriate.

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--- Comment #14 from Francisco Jerez <currojerez at riseup.net> 2010-08-27
06:15:21 PDT ---
(In reply to comment #13)
> (In reply to comment #12)
> > The all-is-frozen situation described in the comment only appeared
once.
> > During my bisecting,while Xorg is frozen,I'm still able to move
mouse and
> > network is still working.
Actually if it were some kind of kernel deadlock you wouldn't be able to
move
the mouse at all. Most likely the card has locked up for some reason, can you
reboot with "drm.debug=3 log_buf_len=256k" in the kernel command line
and
attach new kernel logs after the hang?
> > So according to the definition of 'Hardlockups':
> >   Hardlockups are bugs that cause the CPU to loop in kernel mode
> >   for more than 60 seconds, without letting other interrupts have a
> >   chance to run.
> > I don't think this is a hardlockup.
> 
> Ah! Then CONFIG_DETECT_HUNG_TASK would be more appropriate.
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--- Comment #15 from DarkRaven <drdarkraven at gmail.com> 2010-08-27
06:37:03 PDT ---
Created an attachment (id=38220)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38220)
Kernel log

Only attach part of it,should be enough.
Don't think you would need the full 247k dmesg output.

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--- Comment #16 from DarkRaven <drdarkraven at gmail.com> 2010-08-27
06:39:24 PDT ---
BTW,X is running at R stat while hanging,and top shows sys takes all the cpu
time.

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--- Comment #17 from DarkRaven <drdarkraven at gmail.com> 2010-08-27
06:51:32 PDT ---
FYI,commit 58374713c9dfb4d231f8c56cac089f6fbdedc2ec changed lock_kernel() and
unlock_kernel() before and after the func() call to mutex_lock() and
mutex_unlock().

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--- Comment #18 from Francisco Jerez <currojerez at riseup.net> 2010-08-27
08:02:38 PDT ---
(In reply to comment #15)
> Created an attachment (id=38220)
 -->
(https://bugs.freedesktop.org/attachment.cgi?id=38220)
> Kernel log
> 
> Only attach part of it,should be enough.
> Don't think you would need the full 247k dmesg output.
It looks like fallout from an earlier problem, so yeah, full kernel logs would
be interesting.

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--- Comment #19 from DarkRaven <drdarkraven at gmail.com> 2010-08-27
08:09:27 PDT ---
Created an attachment (id=38224)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38224)
More Kernel Log

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DarkRaven <drdarkraven at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #38224|application/octet-stream    |text/plain
          mime type|                            |

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--- Comment #20 from Francisco Jerez <currojerez at riseup.net> 2010-08-28
04:31:23 PDT ---
(In reply to comment #19)
> Created an attachment (id=38224)
 -->
(https://bugs.freedesktop.org/attachment.cgi?id=38224)
> More Kernel Log
> [...]
>
> ----Many similar lines----
>
So you claim there are no errors there? Please, provide *full* kernel logs.

BTW, can you reproduce this with the 3D drivers uninstalled?

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--- Comment #21 from DarkRaven <drdarkraven at gmail.com> 2010-08-28
05:25:15 PDT ---
Full kernel log here (too large for bugzilla):
http://pastebin.com/5TKurz6u

And I can reproduce it without 3D driver (completely without
3D,nouveau_dri,libGL & mesa uninstalled)

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--- Comment #22 from DarkRaven <drdarkraven at gmail.com> 2010-08-28
07:26:30 PDT ---
BTW,I won't have chance to use this computer (with NV34 graphic card) for
the
coming month.

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--- Comment #23 from Francisco Jerez <currojerez at riseup.net> 2010-08-28
08:33:50 PDT ---
Created an attachment (id=38240)
 View: https://bugs.freedesktop.org/attachment.cgi?id=38240
 Review: https://bugs.freedesktop.org/review?bug=29583&attachment=38240

nouveau_ttm_preemption.patch

(In reply to comment #22)
> BTW,I won't have chance to use this computer (with NV34 graphic card)
for the
> coming month.
Most likely this is a race between the X server thread and the TTM delayed work
queue. It couldn't happen before because taking the BKL disables preemption.
Are you still in time to test patches?

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--- Comment #24 from DarkRaven <drdarkraven at gmail.com> 2010-08-28
16:01:27 PDT ---
(In reply to comment #23)
> Created an attachment (id=38240)
 View: https://bugs.freedesktop.org/attachment.cgi?id=38240
 Review: https://bugs.freedesktop.org/review?bug=29583&attachment=38240
> nouveau_ttm_preemption.patch
> 
> (In reply to comment #22)
> > BTW,I won't have chance to use this computer (with NV34 graphic
card) for the
> > coming month.
> 
> Most likely this is a race between the X server thread and the TTM delayed
work
> queue. It couldn't happen before because taking the BKL disables
preemption.
> Are you still in time to test patches?
Sorry, can't.

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walt <w41ter at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |w41ter at gmail.com

--- Comment #25 from walt <w41ter at gmail.com> 2010-08-28 16:09:42 PDT
---
I've been having similar freezes with NV34 while using very recent kernels,
so
I would be very happy to test patches.

I'm using the nouveau support in Linus.git kernel, though, not nouveau.git. 
I
could start using nouveau.git if that's what you'd be creating patches
from.

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--- Comment #26 from Francisco Jerez <currojerez at riseup.net> 2010-08-28
18:23:41 PDT ---
(In reply to comment #25)
> I've been having similar freezes with NV34 while using very recent
kernels, so
> I would be very happy to test patches.
> 
> I'm using the nouveau support in Linus.git kernel, though, not
nouveau.git.  I
> could start using nouveau.git if that's what you'd be creating
patches from.
Yeah, you could apply it over Linus' tree, if you want, but it has already
been
reported to solve the problem.

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--- Comment #27 from walt <w41ter at gmail.com> 2010-08-29 10:59:37 PDT
---
Today's kernel from Linus seems to fix the problem for me too, fingers
crossed.

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Francisco Jerez <currojerez at riseup.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #28 from Francisco Jerez <currojerez at riseup.net> 2010-08-30
11:53:49 PDT ---
I've pushed the fix to master, closing.

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Francisco Jerez <currojerez at riseup.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mschiffer at universe-factory.
                   |                            |net

--- Comment #29 from Francisco Jerez <currojerez at riseup.net> 2010-08-30
11:59:41 PDT ---
*** Bug 29809 has been marked as a duplicate of this bug. ***

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--- Comment #30 from walt <w41ter at gmail.com> 2010-08-31 19:46:57 PDT
---
(In reply to comment #28)
> I've pushed the fix to master, closing.
The bug may be closed, but the dumb questions linger on forever :p

Yesterday I noticed a very similar hang on my NV4 machine (which I didn't
see
before yesterday).

Does it make sense that this same bug would also affect an NV4 chipset?  Or
should I start thinking about filing a different bug report?

Many thanks!

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--- Comment #31 from Francisco Jerez <currojerez at riseup.net> 2010-09-01
05:05:37 PDT ---
(In reply to comment #30)
> (In reply to comment #28)
> > I've pushed the fix to master, closing.
> 
> The bug may be closed, but the dumb questions linger on forever :p
> 
> Yesterday I noticed a very similar hang on my NV4 machine (which I
didn't see
> before yesterday).
> 
> Does it make sense that this same bug would also affect an NV4 chipset?  Or
> should I start thinking about filing a different bug report?
> 
Yeah it's probably the same issue, this bug affected the whole card range.
> Many thanks!
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