On 02/16/2012 10:46 AM, Michel Dänzer wrote:
On Don, 2012-02-16 at 00:45 +0100, Mario Kleiner wrote:
If a swaplimit> 1 is set on a server which
supports the swaplimit api (XOrg 1.12.0+),
the following can happen:
1. Client calls glXSwapBuffersMscOML() with a
swap target> 1 vblank in the future, or a
client calls glXSwapbuffers() while the swap
interval is set to> 1 (unusual but possible).
2. nouveau_dri2_finish_swap() is therefore called
only at the target vblank, instead of immediately.
3. Because of the deferred execution of
nouveu_dri2_finish_swap(), the OpenGL client
can call x-servers DRI2GetBuffersWithFormat()
before nouveau_dri2_finish_swap() executes and
it deletes pixmaps that would be needed by
nouveau_dri2_finish_swap() --> Segfault --> Crash.
Pixmaps are reference counted, so it should be possible to fix this via
proper reference counting.
Thanks for the tip. I'll try that.
-mario
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