Nouveau - Feb 2011 - [Bug 33999] New: 2.6.37 - NV11 crashes X if glxgears maximised

https://bugs.freedesktop.org/show_bug.cgi?id=33999

           Summary: 2.6.37 - NV11 crashes X if glxgears maximised
           Product: xorg
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: alex.buell at munted.org.uk
         QAContact: xorg-team at lists.x.org


With Gnome, start glxgears, then click on maximise, X will crash. With
LIBGL_ALWAYS_SOFTWARE=1, crashes do not occur. 

Starting KDE 4.6.x always result in a X crash. 

Logs attached. I am always happy to assist if necessary to fix this problem.

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--- Comment #1 from Alex Buell <alex.buell at munted.org.uk> 2011-02-07
12:13:49 PST ---
Created an attachment (id=43038)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=43038)
dmesg output

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--- Comment #2 from Alex Buell <alex.buell at munted.org.uk> 2011-02-07
12:14:19 PST ---
Created an attachment (id=43040)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=43040)
2.6.37 Xorg.0.log

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--- Comment #3 from Alex Buell <alex.buell at munted.org.uk> 2011-02-07
12:18:17 PST ---
I'd consider this a regression since 2.6.36 worked perfectly with the same
program and same libraries.

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--- Comment #4 from Alex Buell <alex.buell at munted.org.uk> 2011-02-07
14:34:38 PST ---
Created an attachment (id=43052)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=43052)
dmesg with drm.debug=6

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Alex Buell <alex.buell at munted.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|2.6.37 - NV11 crashes X if  |2.6.37 - NV11 crashes X if
                   |glxgears maximised          |glxgears started

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Alex Buell <alex.buell at munted.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #43052|0                           |1
        is obsolete|                            |

--- Comment #5 from Alex Buell <alex.buell at munted.org.uk> 2011-02-07
16:22:51 PST ---
Created an attachment (id=43058)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=43058)
2.6.37 dmesg

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--- Comment #6 from Alex Buell <alex.buell at munted.org.uk> 2011-02-07
18:12:08 PST ---
I managed to get a backtrace:

Program received signal SIGSEGV, Segmentation fault.
0xb72d7821 in nouveau_dri2_create_buffer (pDraw=0x845e918, attachment=1,
format=0) at nouveau_dri2.c:72
72    nouveau_dri2.c: No such file or directory.
    in nouveau_dri2.c
(gdb) bt
#0  0xb72d7821 in nouveau_dri2_create_buffer (pDraw=0x845e918, attachment=1,
format=0) at nouveau_dri2.c:72
#1  0xb7327935 in ?? () from /usr/lib/xorg/modules/extensions/libdri2.so
#2  0xb7329ca0 in ?? () from /usr/lib/xorg/modules/extensions/libdri2.so
#3  0x08071e7f in Dispatch () at dispatch.c:432
#4  0x0806577a in main (argc=6, argv=0xbfbd3824, envp=0xbfbd3840) at main.c:291

The offending line of code that caused the crash is:

    nouveau_bo_handle_get(nouveau_pixmap(ppix)->bo,
&nvbuf->base.name);

I'm not sure why it's crashing at this point but my guess is that
it's probably
the ->bo that might be the cause. I'd be glad to help track the cause
down. I
just need some input on how to proceed.

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--- Comment #7 from Alex Buell <alex.buell at munted.org.uk> 2011-02-28
18:36:13 PST ---
Just a quick word to say I've traced it to memory allocation problems. The
card
is a 32MB adapter living in a 64MB GART, with 16MB allocated to a scratch
buffer. Attempts to reduce the amount of memory allocated to the scratch buffer
ended in failure. The biggest allocation was 17MB, not sure what this was
allocated for. See http://ompldr.org/vN2x1eQ for some debugging in the nouveau
ddx driver. 

Ideas welcome on how to get this to work.

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--- Comment #8 from Alex Buell <alex.buell at munted.org.uk> 2011-03-01
03:01:51 PST ---
http://cgit.freedesktop.org/nouveau/xf86-video-nouveau/commit/?id=ace98a492353e6de712f4f717e6d3f562e3591f0
fixes the crash in the X server. 
(thanks to pq)

There are still problems, but trying 2.6.38-rc6 at the moment.

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--- Comment #10 from maximlevitsky at gmail.com 2011-12-05 14:43:20 UTC ---
Funny though, I just tested an NV11, in old box I played with today.

System itself has 256MB or ram, thus totally unusable even in xubuntu, but
nouveau does work and glxgears does work as well (glxinfo reports that nouveau,
nv11 driver is used).
Kudos, guys!

That card was Nvidia Geforce2 MX 200, with 32 MB of ram.
I just installed ubuntu 11.10 there.

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--- Comment #11 from Alex Buell <alex.buell at munted.org.uk> 2011-12-05
15:32:47 UTC ---
(In reply to comment #10)
> Funny though, I just tested an NV11, in old box I played with today.
> 
> System itself has 256MB or ram, thus totally unusable even in xubuntu, but
> nouveau does work and glxgears does work as well (glxinfo reports that
nouveau,
> nv11 driver is used).
> Kudos, guys!
> 
> That card was Nvidia Geforce2 MX 200, with 32 MB of ram.
> I just installed ubuntu 11.10 there.
How much graphic memory did you have on your box, and which versions of the
OpenGL stack did you use with which kernel, please?

I will be testing on my old laptop as well.

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--- Comment #9 from Marcin Slusarz <marcin.slusarz at gmail.com>
2011-12-05 13:35:36 PST ---
There were some patches to nouveau-git kernel and xf86-video-nouveau which
probably fix this bug. Please test it.

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--- Comment #12 from Alex Buell <alex.buell at munted.org.uk> 2011-12-06
17:06:05 PST ---
(In reply to comment #11)
> I will be testing on my old laptop as well.
Just tested, glxinfo still crashes with a segfault. 

OpenGL stack used:

xf86-video-nouveau 0.0.16_pre20111109
mesa 7.11.2
xorg-server 1.10.4

Kernel:
3.1.0

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--- Comment #13 from Marcin Slusarz <marcin.slusarz at gmail.com>
2011-12-07 08:09:50 PST ---
Alex: you need kernel from nouveau git tree (see
http://nouveau.freedesktop.org/wiki/InstallDRM ).

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--- Comment #14 from Alex Buell <alex.buell at munted.org.uk> 2012-04-13
17:33:32 PDT ---
(In reply to comment #13)
> Alex: you need kernel from nouveau git tree (see
> http://nouveau.freedesktop.org/wiki/InstallDRM ).
With 3.3.0, X no longer crashes. Tested on Gnome 3 in fallback mode. One small
problem is that if I try to start Gnome 3, it will die with an error. Using
fallback mode avoids the problem yet OpenGL programs seem to work just as well. 

Yay :)

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

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

--- Comment #15 from Ilia Mirkin <imirkin at alum.mit.edu> ---
All the comments seem to indicate that the issue is fixed, updating status to
reflect that.

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