[Bug 49198] glxinfo SIGSEGV in pthread_detach under radeon_drm_cs_destroy under dri2_destroy_context

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49198

--- Comment #7 from Andre Heider <a.heider at gmail.com> 2012-05-22 08:42:42 PDT ---
Well, I just skimmed over the patch, so maybe I'm missing something, but what
I'm seeing is: 2 threads
a) runs radeon_drm_cs_destroy()
b) runs radeon_drm_cs_emit_ioctl()

When e.g. a context switch occurs on thread a) between 1) and 2) then thread b)
can run pipe_semaphore_signal(&cs->flush_completed) before a) runs
pipe_semaphore_wait(&cs->flush_completed).
The former will effectively be a noop since no other thread is waiting and the
latter will block forever.
No?

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