Nouveau - Aug 2010 - [Bug 29809] New: Random hangs on GeForce 8400M GS (NV86)

https://bugs.freedesktop.org/show_bug.cgi?id=29809

           Summary: Random hangs on GeForce 8400M GS (NV86)
           Product: xorg
           Version: 7.5
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: mschiffer at universe-factory.net
         QAContact: xorg-team at lists.x.org


With the current nouveau git drm (4a97c59) my X frequently freezes (pointer
still moves, but everything else hangs), often within few minutes after
starting X, sometimes much later. My kernel log shows a PFIFO_DMA_PUSHER on Ch
2, the Xorg logs a EQ overflow.

I'm rather confident that commit 5837471 is causing my problems (although
bisecting was very hard as the hangs occur randomly). With the commit before, I
haven't had any problems yet, and reverting this commit on current HEAD
seems
to solve the problem, too.

The revert seems also to fix s2ram, which is also broken in current HEAD for me
(on resume I get a black screen with the pointer, in contrast to the other
hangs the pointer still changes when moving over a text field etc.).

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https://bugs.freedesktop.org/show_bug.cgi?id=29809

--- Comment #1 from Ben Skeggs <skeggsb at gmail.com> 2010-08-25 21:16:14
PDT ---
There's been a number of reports of random hangs etc since 2.6.36-rc1 was
merged, and I agree this is probably the most likely candidate.  However,
I'm
not certain why yet.

I personally don't see any issue in normal use, but may have just
encountered
the problem running gtkperf with compiz enabled.  I'll play around with
reverting that commit now too.

For the suspend issue, I've seen that too randomly, a vt-switch to console
and
back seems to "fix" it.

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--- Comment #2 from Matthias Schiffer <mschiffer at universe-factory.net>
2010-08-25 21:33:24 PDT ---
I see this issue without running any GL programs and with only swrast
installed. It don't think I do anything special when I get it, it occurs in
normal use for me.

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--- Comment #3 from Ben Skeggs <skeggsb at gmail.com> 2010-08-25 22:18:45
PDT ---
Yeah, I don't think they're related.  Just meant to note that I've
seen
regressions as a result of that commit too.

I've tracked down the fix for the issue I was seeing, it's in nouveau
git now.
But, I don't think it'll help you still, unfortunately.

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--- Comment #4 from Matthias Schiffer <mschiffer at universe-factory.net>
2010-08-26 15:02:56 PDT ---
Indeed, the current HEAD doesn't work any better. After reverting 5837471, I
haven't had any crashes, my system was running several hours since then, so
it
is really that commit causing the hangs.

The s2ram issue occured nevertheless, so that problem is completely unrelated
to the hangs.

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maximlevitsky at gmail.com changed:

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

--- Comment #5 from maximlevitsky at gmail.com 2010-08-26 16:25:13 PDT ---
I confirm the exact same issue.

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--- Comment #6 from Francisco Jerez <currojerez at riseup.net> 2010-08-28
18:24:57 PDT ---
This seems to be a duplicate of bug 29583, can you confirm that the patch
attached to it fixes it?

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--- Comment #7 from maximlevitsky at gmail.com 2010-08-29 03:30:57 PDT ---
This patch sort of works.

My system used to hang just after few minutes of usage.
With this patch I used the system for about 1/2 of hour, but then X hanged.
I might be another bug.
( I also did many s2ram cycles, which sometimes garbage the screen, so I might
be just lucky to have this hang)

Note that in 2.6.35, I see no hangs, no matter what I do with the system.
(But like I said before I might have beein just lucky. I do see occasional
garbage on the screen after resume from ram)

I always run compiz.

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--- Comment #8 from Francisco Jerez <currojerez at riseup.net> 2010-08-29
03:57:38 PDT ---
Created an attachment (id=38258)
 View: https://bugs.freedesktop.org/attachment.cgi?id=38258
 Review: https://bugs.freedesktop.org/review?bug=29809&attachment=38258

nouveau_pushbuf_deadlock.patch

(In reply to comment #7)
> This patch sort of works.
> 
> My system used to hang just after few minutes of usage.
> With this patch I used the system for about 1/2 of hour, but then X hanged.
> I might be another bug.
> ( I also did many s2ram cycles, which sometimes garbage the screen, so I
might
> be just lucky to have this hang)
> 
Can you reproduce it with the attached patch applied on top of the other one?
If you can (and it isn't locked up hard), please provide kernel logs after
the
hang.
> Note that in 2.6.35, I see no hangs, no matter what I do with the system.
> (But like I said before I might have beein just lucky. I do see occasional
> garbage on the screen after resume from ram)
> 
> I always run compiz.
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--- Comment #9 from Matthias Schiffer <mschiffer at universe-factory.net>
2010-08-29 09:18:58 PDT ---
The patch from bug 29583 seems to fix the hangs for me, my system has been
running for several hours without problems. I'm not running compiz or other
GL
programs.

Should I test the new patch, too?

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Francisco Jerez <currojerez at riseup.net> changed:

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

--- Comment #10 from Francisco Jerez <currojerez at riseup.net> 2010-08-30
11:59:41 PDT ---
(In reply to comment #9)
> The patch from bug 29583 seems to fix the hangs for me, my system has been
> running for several hours without problems. I'm not running compiz or
other GL
> programs.
> 
Thanks, I'm marking this bug as duplicate then.
> Should I test the new patch, too?
*** This bug has been marked as a duplicate of bug 29583 ***

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