Bug 96327 - Assertion failure in radeon_drm_cs.c (Shadow of Mordor)
Summary: Assertion failure in radeon_drm_cs.c (Shadow of Mordor)
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/Gallium/radeonsi (show other bugs)
Version: git
Hardware: x86-64 (AMD64) Linux (All)
: medium minor
Assignee: Jan Ziak (http://atom-symbol.net)
QA Contact: Default DRI bug account
Depends on:
Reported: 2016-06-02 16:24 UTC by Jan Ziak (http://atom-symbol.net)
Modified: 2016-10-17 22:01 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:


Description Jan Ziak (http://atom-symbol.net) 2016-06-02 16:24:02 UTC
Mesa 12.1.0-devel (git-6c9a352)

src/gallium/winsys/radeon/drm/radeon_drm_cs.c:388: radeon_drm_cs_check_space: Assertion `rcs->current.cdw <= rcs->current.max_dw' failed.

I can try to generate a backtrace if needed.
Comment 1 Michel Dänzer 2016-06-03 00:25:42 UTC
Is this a regression? If yes, can you bisect?
Comment 2 Jan Ziak (http://atom-symbol.net) 2016-06-05 22:36:20 UTC
This is a data race issue caused by incorrect locking of gl_context by the game. The game is indirectly using the same gl_context from two OS threads.
Comment 3 Nicolai Hähnle 2016-06-07 23:22:32 UTC
I take it this means this can be closed as NOTOURBUG?
Comment 4 Jan Ziak (http://atom-symbol.net) 2016-06-09 09:59:00 UTC
(In reply to Nicolai Hähnle from comment #3)
> I take it this means this can be closed as NOTOURBUG?

If it was my decision to make, I would still fix it in Mesa because it slightly broadens the range of stable applications and slightly increases end-user satisfaction.

Programming bugs cannot be prevented in an absolute sense.

If possible Mesa should print a warning with backtraces (libunwind?) which would help application developers to locate the problem.

I suggest to leave this bug open.
Comment 5 Marek Olšák 2016-10-17 21:38:31 UTC
A Feral representative told me that Shadow Of Mordor works.
Comment 6 Jan Ziak (http://atom-symbol.net) 2016-10-17 22:01:58 UTC
(In reply to Marek Olšák from comment #5)
> A Feral representative told me that Shadow Of Mordor works.

Just a note:

I protect a number of OpenGL API functions by a mutex added via a private patch to my local Mesa installation, so Shadow of Mordor works OK on my machine. Prior to that, I was experiencing failures in this game, mostly in the game menu.

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