[Bug 1397] kbounces crashes composite extension

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https://bugs.freedesktop.org/show_bug.cgi?id=1397          
     




------- Additional Comments From clemens at endorphin.org  2005-02-19 07:39 -------
I'm tapping in the dark, with respect to this bug. stracing Xorg in -dumbSched
shows, that X gets stuck waiting for a futex. Inspecting the address of the
futex reveals that it comes from glibc, and is the malloc futex.

Updating glibc doesn't help. Normally I'd suspect it to be a bug in glibc, that
glibc has some kind of race that causes it to loss synchronization. But this bug
is only reproducable with Composite enabled, so I'm wondering if there is
something in Xorg which can deadlock? Another synchronization mechanism? 

I compiled Xorg with debug, but I'm not sure what's the gain, except it's
awefully slow. A practical question, is there a way to produce a stack trace
when the program is in kernel mode? I really don't think so, however..

Or is there some kind of function call log, so I can see what functions are
called before X locking?

          
     
     
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