[Bug 56891] New: TRAP_VFETCH FAULT

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=56891

           Summary: TRAP_VFETCH FAULT
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.9-rc7
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri at kernel-bugs.osdl.org
        ReportedBy: george.shuklin at gmail.com
        Regression: No


nouveau cause unexpected delays and periodic freeze (<0.2s) when rendering 
complicated 3D scene.

Here dmesg during lags (repeat many times): 

[46444.498018] nouveau E[  PGRAPH][0000:01:00.0] TRAP_VFETCH FAULT
[46444.498028] nouveau E[  PGRAPH][0000:01:00.0] TRAP_VFETCH 00f00000 0000fe0c
00000000 00000000
[46444.498031] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
[46444.498037] nouveau E[  PGRAPH][0000:01:00.0] ch 4 [0x001f8eb000
el.x86.linux.bi[7941]] subc 5 class 0x8297 mthd 0x0f04 data 0x3f800000
[46444.498045] nouveau E[     PFB][0000:01:00.0] trapped read at 0x0000000000
on channel 0x0001f8eb [el.x86.linux.bi[7941]] PGRAPH/VFETCH/00 reason:
PT_NOT_PRESENT
[46444.498070] nouveau E[  PGRAPH][0000:01:00.0] TRAP_VFETCH FAULT
[46444.498082] nouveau E[  PGRAPH][0000:01:00.0] TRAP_VFETCH 00f00000 0000fe0c
00000000 00000000
[46444.498085] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
[46444.498092] nouveau E[  PGRAPH][0000:01:00.0] ch 4 [0x001f8eb000
el.x86.linux.bi[7941]] subc 5 class 0x8297 mthd 0x0f04 data 0x40028f58
[46448.541527] nouveau E[  PGRAPH][0000:01:00.0] TRAP_VFETCH FAULT
[46448.541537] nouveau E[  PGRAPH][0000:01:00.0] TRAP_VFETCH 00f00000 0000fe0c
00000000 00000000
[46448.541540] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
[46448.541545] nouveau E[  PGRAPH][0000:01:00.0] ch 4 [0x001f8eb000
el.x86.linux.bi[7941]] subc 5 class 0x8297 mthd 0x0f04 data 0x3f800000
[46448.541557] nouveau E[     PFB][0000:01:00.0] trapped read at 0x0000000000
on channel 0x0001f8eb [el.x86.linux.bi[7941]] PGRAPH/VFETCH/00 reason:
PT_NOT_PRESENT
[46448.541590] nouveau E[  PGRAPH][0000:01:00.0] TRAP_VFETCH FAULT
[46448.541601] nouveau E[  PGRAPH][0000:01:00.0] TRAP_VFETCH 00f00000 0000fe0c
00000000 00000000
[46448.541605] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
[46448.541612] nouveau E[  PGRAPH][0000:01:00.0] ch 4 [0x001f8eb000
el.x86.linux.bi[7941]] subc 5 class 0x8297 mthd 0x0f04 data 0x00000000


But that problem is same with many 3D applications. Was seen at least from 3.2
to 3.9-rc7.

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