[Bug 105339] Deadlock inside glClientWaitSync

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=105339

--- Comment #4 from Matias N. Goldberg <dark_sylinc@yahoo.com.ar> ---
By the way, if I change the waits to the following:

while( waitRet != GL_ALREADY_SIGNALED && waitRet != GL_CONDITION_SATISFIED )
{
    waitDuration = 1 second;
    waitRet = glClientWaitSync( fenceName, waitFlags, waitDuration );
    assert( waitRet != GL_WAIT_FAILED );
}

Then it still deadlocks. glClientWaitSync returns, but the fence never
completes, leaving the while() loop as an infinite loop.

Once it starts deadlock, if I step inside si_fence_finish I can see that
rfence->tc_token is 0, which either means that it was always 0, or it has been
already zeroed.

I do not know how to continue debugging this race condition as I am not
familiar with the code.

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