(gdb) thread apply all bt

Thread 1 (Thread 0xb7234700 (LWP 10296)):
#0  0xb76f2424 in __kernel_vsyscall ()
#1  0xb72507ab in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/i686/cmov/libpthread.so.0
#2  0xb73cc2ac in pthread_cond_wait () from /lib/i386-linux-gnu/i686/cmov/libc.so.6
#3  0xb6b5291c in radeon_drm_cs_sync_flush () from /usr/lib/i386-linux-gnu/dri/r600_dri.so
#4  0xb6b53250 in ?? () from /usr/lib/i386-linux-gnu/dri/r600_dri.so
#5  0xb6ae5d3c in ?? () from /usr/lib/i386-linux-gnu/dri/r600_dri.so
#6  0xb6ae7358 in ?? () from /usr/lib/i386-linux-gnu/dri/r600_dri.so
#7  0xb6ae7669 in ?? () from /usr/lib/i386-linux-gnu/dri/r600_dri.so
#8  0xb68db04c in ?? () from /usr/lib/i386-linux-gnu/dri/r600_dri.so
#9  0xb69022b4 in ?? () from /usr/lib/i386-linux-gnu/dri/r600_dri.so
#10 0xb6b4f09d in dri_flush () from /usr/lib/i386-linux-gnu/dri/r600_dri.so
#11 0xb76bd3cd in ?? () from /usr/lib/i386-linux-gnu/mesa/libGL.so.1
#12 0xb76bd7a2 in ?? () from /usr/lib/i386-linux-gnu/mesa/libGL.so.1
#13 0xb7692b12 in glXSwapBuffers () from /usr/lib/i386-linux-gnu/mesa/libGL.so.1
#14 0x08057af2 in paint_all (ps=ps@entry=0x9412860, region=29360203, region_real=<optimized out>, region_real@entry=0, t=t@entry=0x94cbf60) at src/compton.c:1931
#15 0x0804d309 in session_run (ps=0x9412860) at src/compton.c:7219
#16 main (argc=4, argv=0xbf92c9b4) at src/compton.c:7275