[Nouveau] [Bug 95109] New: multiple instances of buffer 186 on validation list

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95109

            Bug ID: 95109
           Summary: multiple instances of buffer 186 on validation list
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: chernoff at astro.cornell.edu
        QA Contact: xorg-team at lists.x.org

OS:

Linux localhost.localdomain 4.1.13-100.fc21.x86_64 #1 SMP Tue Nov 10 13:13:20
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Two mirrored screens: ASUS laptop screen and Viewsonic VP2650wb 

Graphics card: NVIDIA Corporation G96M [GeForce 9650M GT] (rev a1)

System locks up with
kernel: nouveau E[gnome-shell[2035]] multiple instances of buffer 186 on
validation list
kernel: nouveau E[gnome-shell[2035]] validate_init
kernel: nouveau E[gnome-shell[2035]] validate: -22
gnome-session[1905]: nouveau: kernel rejected pushbuf: Invalid argument

followed by a dump of ch0: buf data (I can include if useful)

and then many messages of the form

kernel: nouveau E[  PGRAPH][0000:01:00.0] TRAP_PROP - TP 0 - RT_FAULT - Address
00465f0000
kernel: nouveau E[  PGRAPH][0000:01:00.0] TRAP_PROP - TP 0 - e0c: 00000000,
e18: 00000000, e1c: 00000000, e20: 00002a00, e24: 00030000
kernel: nouveau E[  PGRAPH][0000:01:00.0] ch 4 [0x003fc2a000 gnome-shell[2035]]
subc 3 class 0x8297 mthd 0x15e0 data 0x00000000
kernel: nouveau E[     PFB][0000:01:00.0] trapped write at 0x00465f0000 on
channel 0x0003fc2a [gnome-shell[2035]] PGRAPH/PROP/RT0 reason: 

Gnome pointer is alive, no window buttons function. After about 2 minutes the
system returns to normal.

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