Nouveau - May 2011 - [Bug 37445] New: Nouveau regulary reports the TRAP_VFETCH FAULT errors.

https://bugs.freedesktop.org/show_bug.cgi?id=37445

           Summary: Nouveau regulary reports the TRAP_VFETCH FAULT errors.
           Product: Mesa
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: All
            Status: NEW
          Severity: minor
          Priority: medium
         Component: Drivers/DRI/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: maximlevitsky at gmail.com


Like this:


 9714.987179] [drm] nouveau 0000:01:00.0: PGRAPH - TRAP_VFETCH FAULT
[ 9714.987203] [drm] nouveau 0000:01:00.0: PGRAPH - TRAP_VFETCH 00f00000
0000fe0c 00000000 00000000
[ 9714.987219] [drm] nouveau 0000:01:00.0: PGRAPH - TRAP
[ 9714.987234] [drm] nouveau 0000:01:00.0: PGRAPH - ch 5 (0x000770a000) subc 5
class 0x8297 mthd 0x15f0 data 0x00000000
[ 9714.987265] [drm] nouveau 0000:01:00.0: VM: trapped read at 0x0000000000 on
ch 5 [0x0000770a] PGRAPH/VFETCH/00 reason: PT_NOT_PRESENT
[ 9714.987301] [drm] nouveau 0000:01:00.0: PGRAPH - TRAP_VFETCH FAULT
[ 9714.987320] [drm] nouveau 0000:01:00.0: PGRAPH - TRAP_VFETCH 00f00000
0000fe0c 00000000 00000000
[ 9714.987336] [drm] nouveau 0000:01:00.0: PGRAPH - TRAP
[ 9714.987350] [drm] nouveau 0000:01:00.0: PGRAPH - ch 5 (0x000770a000) subc 5
class 0x8297 mthd 0x15f0 data 0x09000936
[ 9714.987376] [drm] nouveau 0000:01:00.0: VM: trapped read at 0x0000000000 on
ch 5 [0x0000770a] PGRAPH/VFETCH/00 reason: PT_NOT_PRESENT
[ 9714.987411] [drm] nouveau 0000:01:00.0: PGRAPH - TRAP_VFETCH FAULT
[ 9714.987429] [drm] nouveau 0000:01:00.0: PGRAPH - TRAP_VFETCH 00f00000
0000fe0c 00000000 00000000
[ 9714.987445] [drm] nouveau 0000:01:00.0: PGRAPH - TRAP
[ 9714.987461] [drm] nouveau 0000:01:00.0: PGRAPH - ch 5 (0x000770a000) subc 5
class 0x8297 mthd 0x15f0 data 0x00000013
[ 9714.987497] [drm] nouveau 0000:01:00.0: PGRAPH - TRAP_VFETCH FAULT
[ 9714.987516] [drm] nouveau 0000:01:00.0: PGRAPH - TRAP_VFETCH 00f00000
0000fe0c 00000000 00000000
[ 9714.987532] [drm] nouveau 0000:01:00.0: PGRAPH - TRAP
[ 9714.987546] [drm] nouveau 0000:01:00.0: PGRAPH - ch 5 (0x000770a000) subc 5
class 0x8297 mthd 0x15f0 data 0x32212121
[ 9714.987577] [drm] nouveau 0000:01:00.0: VM: trapped read at 0x0000000000 on
ch 5 [0x0000770a] PGRAPH/VFETCH/00 reason: PT_NOT_PRESENT

Not sure if that can cause a lockup, but sure a clue, so I keep this in a
bugreport.

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maximlevitsky at gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Nouveau regulary reports    |Nouveau regularly reports
                   |the TRAP_VFETCH FAULT       |the TRAP_VFETCH FAULT
                   |errors.                     |errors.

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--- Comment #1 from maximlevitsky at gmail.com 2011-05-21 17:34:28 PDT ---
I used to have a lot of faults on access to FB bar, apparently caused by BIOS.
Since now FB bar is mapped via VM, maybe its the same thing?

The faults themselves were accesses from SMI code my bios runs apparently for
no reason (some debug code leftovers maybe)

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--- Comment #2 from Christoph Bumiller <e0425955 at student.tuwien.ac.at>
2011-05-22 02:17:03 PDT ---
VFETCH means "vertex fetch", so it's caused by vertex fetches /
reads of vertex
data by PGRAPH.

One possible reason is that some app asks for vertices outside the limit of a
vertex buffer (for whatever reason - could be app bug, driver bug or mesa bug),
which go to a special memory area, NV50_3D_VERTEX_RUNOUT_ADDRESS, which
isn't
initialized and thus would cause VM faults at address 0.

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--- Comment #3 from maximlevitsky at gmail.com 2011-05-22 03:23:07 PDT ---
That is what I suspected but didn't want to be true.
That happens with many games, so I suspect its nouveau mesa driver and not game
fault, and it might reflect upon something nasty happening in the driver

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--- Comment #4 from maximlevitsky at gmail.com 2011-05-22 03:27:56 PDT ---
I also have just seen that in kernel log:


[29782.682641] [drm] nouveau 0000:01:00.0: PGRAPH - TRAP_TEXTURE - TP0:
Unhandled ustatus 0x00000003
[29782.682671] [drm] nouveau 0000:01:00.0: PGRAPH_TRAP_TPDMA_RT - TP 0 -
Unknown fault at address 0022467000
[29782.682693] [drm] nouveau 0000:01:00.0: PGRAPH_TRAP_TPDMA_RT - TP 0 - e0c:
00000000, e18: 00000000, e1c: 00000000, e20: 00001100, e24: 00030000
[29782.682722] [drm] nouveau 0000:01:00.0: PGRAPH - TRAP
[29782.682740] [drm] nouveau 0000:01:00.0: PGRAPH - ch 5 (0x000472b000) subc 5
class 0x8297 mthd 0x15e0 data 0x00000000
[29782.682771] [drm] nouveau 0000:01:00.0: VM: trapped write at 0x0022467000 on
ch 5 [0x0000472b] PGRAPH/PROP/RT0 reason: PAGE_NOT_PRESENT


Probably unrelated, or maybe not.
This time its texture fetch fault.

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--- Comment #5 from maximlevitsky at gmail.com 2011-05-22 13:52:57 PDT ---
I also want to note that running Unigine demos (all of them) produces these
TRAP_VFETCH FAULT messages and system eventually hangs.
That issue might be the indicator.

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--- Comment #6 from maximlevitsky at gmail.com 2011-08-12 16:35:28 PDT ---
I'll should close this bug I think. Its just an application error who
submits
out of bound vertexes. mesa in debug mode actually complains about that.

Only thing though, maybe you want to filter this bogus data and not give it to
apps?

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--- Comment #7 from bill at taniwha.org 2012-01-27 02:54:03 UTC ---
By debug mode, do you mean "LIBGL_DEBUG=1 glapp"? If so, then mesa is
being
silent about any application errors.

Using nq-glslx (glsl branch of QuakeForge
(git://git.quakeforge.net/gitroot/quake/quakeforge)) and leaving it to idle on
the start map results in these messages eventually appearing after about 90
seconds (with occurrences every 90s or so). However, when I tried running
nq-glslx under valgrind, it wouldn't happen :/

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--- Comment #8 from Kevin N. <vekinn at gmail.com> 2012-03-12 21:30:34 PDT
---
I also run into these errors.  They only occur after I reclock the card to any
performance level above 1. If I then run Heroes of Newerth (Opengl game)  I run
into slowdowns that will eventually lock the system up with this message in log
repeatedly.  The messages and slowdowns stop if I manage to kill X before the
system becomes unresponsive.  Running the game at the default performance level
works fine.

01:00.0 VGA compatible controller: nVidia Corporation G96 [GeForce 9600M GT]
(rev a1)

Mar 11 19:23:46 [kernel] [55207.554706] [drm] nouveau 0000:01:00.0: PGRAPH -
TRAP_VFETCH FAULT
Mar 11 19:23:46 [kernel] [55207.554724] [drm] nouveau 0000:01:00.0: PGRAPH -
TRAP_VFETCH 00f00000 0000fe0c 00000000 00000000
Mar 11 19:23:46 [kernel] [55207.554726] [drm] nouveau 0000:01:00.0: PGRAPH -
TRAP
Mar 11 19:23:46 [kernel] [55207.554730] [drm] nouveau 0000:01:00.0: PGRAPH - ch
4 (0x00040f0000) subc 5 class 0x8297 mthd 0x0f04 data 0xbef727ba
Mar 11 19:23:46 [kernel] [55207.554743] [drm] nouveau 0000:01:00.0: VM: trapped
read at 0x0000000000 on ch 4 [0x000040f0] PGRAPH/VFETCH/00 reason:
PT_NOT_PRESENT

libdrm mesa xf86-video-nouveau and kernel current as of 3 PM 02/19/2012 PST

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--- Comment #9 from Kevin N. <vekinn at gmail.com> 2012-03-12 22:08:37 PDT
---
(In reply to comment #8)
> libdrm mesa xf86-video-nouveau and kernel current as of 3 PM 02/19/2012 PST
Woops meant 03/11/2012

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--- Comment #10 from Kevin N. <vekinn at gmail.com> 2012-04-14 17:06:17
PDT ---
libdrm mesa xf86-video-nouveau and kernel current as of April 14th 16:00 PST

I can no longer reproduce these errors seems to be fixed.

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maximlevitsky at gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #11 from maximlevitsky at gmail.com 2012-08-14 22:27:57 UTC ---
Yep, this is fixed by new shader compiler ages ago.

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