Nouveau - Jul 2009 - [Bug 22756] New: nouveau_fence.c kernel BUG and recursive faults

http://bugs.freedesktop.org/show_bug.cgi?id=22756

           Summary: nouveau_fence.c kernel BUG and recursive faults
           Product: xorg
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: pq at iki.fi
         QAContact: xorg-team at lists.x.org


Created an attachment (id=27647)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=27647)
Xorg log

Nouveau, KMS enabled and working fine, NV28 card.

DRM modules from nouveau/linux-2.6 git, v2.6.31-rc2-65-g7525cc6, branch
master-compat, commit 7525cc6ddc45772f78aa40fe0a767f512f2ae1ed "Clarify
nouveau/DEPENDS file.". This branch is up-to-date with master branch commit
"drm/nouveau: allow celcius on nv20". The host kernel is
2.6.28-gentoo-r5.

When trying to start X, screen blinks, goes black, kernel hits BUGs, but the
machine does not hang. SysRq can unlock the keyboard, but I do not get the
console back, screen stays black. The kernel recommends a reboot after the
recursive fault.

Attaching X.org log (nothing really interesting), and the kernel log with drm
debug=1, except all debug messages starting in nouveau_hw.h disabled (they
overflow the kernel message buffer and I hear they make I2C/DDC fail).

I'm guessing a way to reproduce this would be to remove e.g. NVxxTCL object
from the list of allowed grobjs, and then starting X. Missing NV11TCL was how I
first hit this kind of bug, but adding that did not fix everything. Probably
something wrong in the nouveau DRM error paths.


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http://bugs.freedesktop.org/show_bug.cgi?id=22756





--- Comment #1 from Pekka Paalanen <pq at iki.fi>  2009-07-13 14:28:57 PST
---
Created an attachment (id=27648)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=27648)
kernel log


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--- Comment #2 from David <david.hernando.m at gmail.com>  2009-07-16
04:09:17 PST ---
Created an attachment (id=27759)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=27759)
kernel log


The same happens with NV18.

Removing the patch:

drm/nouveau: protect fence pending list with Spinlock
commit: ed6cc42c377ed125e6b95e0808883a8a47f137c2

this works.


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--- Comment #3 from David <david.hernando.m at gmail.com>  2009-07-17
03:08:38 PST ---

It already works well, I think it's because:

drm/nouveau: fix BUG_ON() on UP systems, spin_is_locked() always returns 0
commit:         f248e95a848d3e70be395862fdf512ffdfcecd51

thanks 


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Pekka Paalanen <pq at iki.fi> changed:

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




--- Comment #4 from Pekka Paalanen <pq at iki.fi>  2009-07-19 08:58:44 PST
---
(In reply to comment #3)
> It already works well, I think it's because:
> 
> drm/nouveau: fix BUG_ON() on UP systems, spin_is_locked() always returns 0
> commit:         f248e95a848d3e70be395862fdf512ffdfcecd51
> 
> thanks 
> 
Yup, confirmed here, too. Latest DRM works just fine.


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