Nouveau - Apr 2010 - [Bug 27574] New: BUG: unable to handle kernel NULL pointer dereference at 0000000000000028

https://bugs.freedesktop.org/show_bug.cgi?id=27574

           Summary: BUG: unable to handle kernel NULL pointer dereference
                    at 0000000000000028
           Product: xorg
           Version: 7.5
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: alex.vizor at gmail.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=34870)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=34870)
kernel.log

I caught it after resume from s2ram

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https://bugs.freedesktop.org/show_bug.cgi?id=27574

--- Comment #1 from Xavier <shiningxc at gmail.com> 2010-04-14 02:49:02
PDT ---
Just for the record, Alex reported this bug to kernel bugzilla in the same time
:
https://bugzilla.kernel.org/attachment.cgi?id=25936

And also 2 months ago already on FDO, but mixed with other issues about s2ram
and s2disk :
http://bugs.freedesktop.org/show_bug.cgi?id=26521
Another user (Michal) caught the same trace there too :
http://bugs.freedesktop.org/attachment.cgi?id=34299

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--- Comment #2 from Alexander <alex.vizor at gmail.com> 2010-04-16
01:06:33 PDT ---
I caught it with 2.6.34-rc4, and looks like it happens every third time after
suspend to ram.

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--- Comment #3 from Alexander <alex.vizor at gmail.com> 2010-04-16
01:07:04 PDT ---
Created an attachment (id=35081)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=35081)
2.6.34-rc4 kernel log

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Alexander <alex.vizor at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |major
           Priority|medium                      |high

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--- Comment #4 from Alexander <alex.vizor at gmail.com> 2010-04-23
09:31:53 PDT ---
Forgot to mention, may be that can help, I have nouveau built in kernel not as
module.

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--- Comment #5 from Alexander <alex.vizor at gmail.com> 2010-04-30
02:53:57 PDT ---
I reproduced it on 2.6.34-rc5 and 2.6.34-rc6, seems like nobody from nouveau
team isn't interested in fixing this bug

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--- Comment #6 from Maarten Maathuis <madman2003 at gmail.com> 2010-04-30
03:57:32 PDT ---
Bugs can be non trivial to fix if you never hit them yourself. In this case it
would be nice to know what value "mem->mem_type" has in
ttm_pci_offset. So if
you feel like poking around, that's where i would start. 0 is system, 1 is
gart, 2 is vram, other is bad.

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--- Comment #7 from Alexander <alex.vizor at gmail.com> 2010-04-30
04:09:46 PDT ---
So if can give some instructions I can help you with investigation

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--- Comment #8 from Maarten Maathuis <madman2003 at gmail.com> 2010-04-30
04:18:08 PDT ---
Adding this to the beginning of the ttm_bo_pci_offset function should print the
value every time, you may have to revert it afterwards because of flooded logs.

printk(KERN_INFO TTM_PFX "mem->mem_type %d\n", mem->mem_type);

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--- Comment #9 from Alexander <alex.vizor at gmail.com> 2010-05-02
14:50:54 PDT ---
I still can't reproduce exactly this bug with proposed debugging but I have
following error or something like this after which system or just X completely
freeze and doesn't respond


May  3 00:37:40 loki kernel: [47292.941614] video LNXVIDEO:01: Restoring
backlight state
May  3 00:37:40 loki kernel: [47293.171676] [TTM] mem->mem_type 2
May  3 00:37:40 loki kernel: [47293.185220] [drm] nouveau 0000:01:00.0:
PFIFO_DMA_PUSHER - Ch 2
May  3 00:37:40 loki kernel: [47293.186640] [drm] nouveau 0000:01:00.0:
PFIFO_CACHE_ERROR - Ch 2/0 Mthd 0x0000 Data 0x0f000000
May  3 00:37:40 loki kernel: [47293.186651] [drm] nouveau 0000:01:00.0:
PFIFO_DMA_PUSHER - Ch 2

it happens on resume from ram also

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Marcin Slusarz <marcin.slusarz at gmail.com> changed:

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

--- Comment #10 from Marcin Slusarz <marcin.slusarz at gmail.com>
2010-06-28 14:13:18 PDT ---


*** This bug has been marked as a duplicate of bug 26521 ***

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