[Bug 66515] mesa/Glamor with glx-tls enabled is causing GPU to hang on VERDE

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66515

--- Comment #22 from Mauro Carvalho Chehab <mchehab at infradead.org> ---
(In reply to comment #21)
> I'm a little confused about the symptoms of the problem:
> 
> The original report and the attached gdb output show what looks like a
> fairly standard X server crash. When this happens, you should get kicked
> back to console or the display manager login screen.
> 
> But the bug title and later comments instead make me think of something like
> a GPU lockup / reset cycle, which sometimes ends with a completely hung
> system.
> 
> What is the connection between these two rather different kinds of symptoms?
> Do both of them occur every time? Together, or one after another? ...

When I opened the BZ, the original symptom were a Xorg crash. On a few cases
the machine just hangs (something like 10% of the crashes).

In order to track the root cause and see if this issue was not solved on a
latter fix, I upgraded from kernel 3.9 to kernel 3.10.3 (and later to 3.10.4)
and updated all packages at the machine. 

With the updated packages, the symptom changed: when the GPU stops to answer to
mesa/Glamor, instead of causing Xorg to crash (and when the machine doesn't
hang) it now reports:

[15225.379837] radeon 0000:01:00.0: GPU lockup CP stall for more than 10000msec

As shown on this attachment:
   https://bugs.freedesktop.org/attachment.cgi?id=83300

The workaround to avoid the buggy code was to disable glx-tls at Mesa.

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