[Bug 68125] New: Radeon HD6950: Failed to parse relocation -35 (Linux 3.11-rc regression)

[Bug 68125] New: Radeon HD6950: Failed to parse relocation -35 (Linux 3.11-rc regression)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=68125

          Priority: medium
            Bug ID: 68125
          Assignee: dri-devel@lists.freedesktop.org
           Summary: Radeon HD6950: Failed to parse relocation -35 (Linux
                    3.11-rc regression)
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: aeb@debian.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

Created attachment 84074
  --> https://bugs.freedesktop.org/attachment.cgi?id=84074&action=edit
Linux 3.11-rc5 dmesg

After running in X for a while, I get a monitor signal dropout for a few
seconds and find the follow messages in the kernel log:

[drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35!
radeon 0000:01:00.0: GPU reset succeeded, trying to resume

Messages about the reset procedure, ring test etc. follow, with different
possible more or less successful recovery scenarios and messages playing out on
different occurences. Usually the second occurence kills X and further attempts
at logging in either end up in GNOME fallback mode or simply die immediately,
leaving only a reboot to solve the problem. With one run in 3.11-rc5 at least
it always recovered, reducing the impact of the bug to the occasional annoying
black screen for a few seconds.

This never happened before and never happens in Linux 3.10. The first kernel in
the 3.11 development cycle was 3.10.0-08918-g8133633, which already showed this
problem.

I'm running Debian unstable, xorg is 7.7, xserver-xorg-video-radeon 6.14.4,
libdrm-radeon1 2.4.46, mesa 9.1.6.

I have attached the log of the 3.11-rc5 which has plenty of these occurences
thanks to always recovering successfully.

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[Bug 68125] Radeon HD6950: Failed to parse relocation -35 (Linux 3.11-rc regression)

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https://bugs.freedesktop.org/show_bug.cgi?id=68125

--- Comment #1 from Alex Deucher <agd5f@yahoo.com> ---
Can you bisect?

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[Bug 68125] Radeon HD6950: Failed to parse relocation -35 (Linux 3.11-rc regression)

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https://bugs.freedesktop.org/show_bug.cgi?id=68125

--- Comment #2 from Andreas Bombe <aeb@debian.org> ---
Created attachment 84076
  --> https://bugs.freedesktop.org/attachment.cgi?id=84076&action=edit
associated Xorg.log

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[Bug 68125] Radeon HD6950: Failed to parse relocation -35 (Linux 3.11-rc regression)

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https://bugs.freedesktop.org/show_bug.cgi?id=68125

--- Comment #3 from Andreas Bombe <aeb@debian.org> ---
(In reply to comment #1)
> Can you bisect?

I will have a go at it tomorrow then. That is going to be very time consuming,
I expect, what with the bug only showing itself after quite some time.


What I also meant to mention is that the complexity of whatever it is doing
does not seem to affect the likelihood of the bug occuring. For example, I
played Team Fortress 2 for quite some time on the 3.11-rc5 run, and that
resulted only in one reset and successful recovery. They don't appear to occur
when the system is really idle though, often they happen just as I start to
move the mouse or scroll in gvim.

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[Bug 68125] Radeon HD6950: Failed to parse relocation -35 (Linux 3.11-rc regression)

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https://bugs.freedesktop.org/show_bug.cgi?id=68125

Andreas Bombe <aeb@debian.org> changed:

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

--- Comment #4 from Andreas Bombe <aeb@debian.org> ---
While bisecting I noticed that CONFIG_DEBUG_WW_MUTEX_SLOWPATH was introduced
and that I had it enabled. Since that potentially introduces additional
-EDEADLK I suspected that check.

Turns out that check was buggy, the fix 85f489612 "mutex: Fix w/w mutex
deadlock injection" was merged since I posted this bug and the commit even
mentions explicitly that the bug caused spurious GPU lockups on radeon. The
problem appears to be gone with this fix.

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