[Nouveau] [Bug 33436] New: data error on channel 128 when running piglit

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=33436

           Summary: data error on channel 128 when running piglit
           Product: xorg
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: shiningxc at gmail.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=42413)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=42413)
dmesg

I get the following message associated with screen freeze every time I do a
piglit run :
[  512.205375] [drm] nouveau 0000:01:00.0: PGRAPH - DATA_ERROR INVALID_OBJECT
[  512.205381] [drm] nouveau 0000:01:00.0: PGRAPH - DATA_ERROR
[  512.205387] [drm] nouveau 0000:01:00.0: PGRAPH - ch 128 (0x0002d30000) subc
3 class 0x5039 mthd 0x0184 data 0x00000e02

Previously I got vanishing text/pictures rather than freeze, but this behavior
has been there for a long time now.

I think it was introduced in October after the 2.6.36-rc7 merge but not 100%
sure.

This commit makes the problem appear less quickly, but it is still reproducible
:
drm/nv50: Fix race with PFIFO during PGRAPH context destruction.

git as of today:
kernel: 64b792
drm: 550fe2
ddx: 38e880

01:00.0 VGA compatible controller: nVidia Corporation G84 [GeForce 8600M GT]
(rev a1)

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