[Nouveau] [Bug 69952] [NVAA] Xorg crash+restart after glxgears on 3.12-rc2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69952

--- Comment #4 from dirkneukirchen at web.de ---
Created attachment 89628
  --> https://bugs.freedesktop.org/attachment.cgi?id=89628&action=edit
dmesg after crash of Xorg when running glxgears

the log contains more debug info; cmdline had "nouveau.debug=trace
drm.debug=14"

[  190.676020] nouveau E[glxgears[3270]] failed to idle channel 0xcccc0000
[glxgears[3270]]
[  205.676014] nouveau E[glxgears[3270]] failed to idle channel 0xcccc0000
[glxgears[3270]]
[  205.676119] nouveau E[     PFB][0000:02:00.0] trapped read at 0x0020012020
on channel 0x0000797f [unknown] SEMAPHORE_BG/PFIFO_READ/00 reason:
PAGE_NOT_PRESENT

after that many:
nouveau E[  PGRAPH][0000:02:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS

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