Bug 56891

Summary:	TRAP_VFETCH FAULT in nouveau during highload 3D
Product:	Drivers	Reporter:	George Shuklin (george.shuklin)
Component:	Video(DRI - non Intel)	Assignee:	drivers_video-dri
Status:	NEW ---
Severity:	normal
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.9-rc7	Subsystem:
Regression:	No	Bisected commit-id:

Description George Shuklin 2013-04-20 12:48:00 UTC

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.