Comment 2 for bug 1332994

(gdb) bt
#0 0xb7776424 in __kernel_vsyscall ()
#1 0xb70d1d4b in pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:187
#2 0xb74f18ec in __pthread_cond_wait (cond=0xa068420, mutex=0xa068408)
    at forward.c:149
#3 0xb4ce86fc in ?? () from /usr/lib/i386-linux-gnu/dri/swrast_dri.so
#4 0xb4cff384 in ?? () from /usr/lib/i386-linux-gnu/dri/swrast_dri.so
#5 0xb4cffb72 in ?? () from /usr/lib/i386-linux-gnu/dri/swrast_dri.so
#6 0xb4d12d25 in ?? () from /usr/lib/i386-linux-gnu/dri/swrast_dri.so
#7 0xb46d2303 in cso_set_framebuffer ()
   from /usr/lib/i386-linux-gnu/libgallium.so.0
#8 0xb4bc3a42 in ?? () from /usr/lib/i386-linux-gnu/dri/swrast_dri.so
#9 0xb4bc2246 in ?? () from /usr/lib/i386-linux-gnu/dri/swrast_dri.so
#10 0xb4bd74d4 in ?? () from /usr/lib/i386-linux-gnu/dri/swrast_dri.so
#11 0xb4ba7448 in ?? () from /usr/lib/i386-linux-gnu/dri/swrast_dri.so
#12 0xb4ba7641 in ?? () from /usr/lib/i386-linux-gnu/dri/swrast_dri.so
#13 0xb4fe0585 in PrivateVertexBuffer::render(GLMatrix const*, GLMatrix const*, GLWindowPaintAttrib const*) () from /usr/lib/compiz/libopengl.so
#14 0xb4fe0c4d in GLVertexBuffer::render(GLMatrix const&, GLMatrix const&, GLWindowPaintAttrib const&) () from /usr/lib/compiz/libopengl.so
#15 0xb4fe0ca7 in GLVertexBuffer::render(GLMatrix const&, GLWindowPaintAttrib const&) () from /usr/lib/compiz/libopengl.so
---Type <return> to continue, or q <return> to quit---

that's as far as I could get as debugging compiz process freezes my terminal ;)