(gdb) thread apply all bt full 

Thread 2 (Thread 0x7fffee4c6700 (LWP 5546)):
#0  0x00007ffff3d7a07f in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
No symbol table info available.
#1  0x00007ffff22fe04a in ?? () from /usr/lib/xorg/modules/dri/r600_dri.so
No symbol table info available.
#2  0x00007ffff22fd787 in ?? () from /usr/lib/xorg/modules/dri/r600_dri.so
No symbol table info available.
#3  0x00007ffff3d744a4 in start_thread () from /usr/lib/libpthread.so.0
No symbol table info available.
#4  0x00007ffff704d13d in clone () from /usr/lib/libc.so.6
No symbol table info available.

Thread 1 (Thread 0x7ffff7f9a740 (LWP 5542)):
#0  0x00007fffedaa55eb in ?? ()
No symbol table info available.
#1  0x000000000076a340 in ?? ()
No symbol table info available.
#2  0x00007fffffffd630 in ?? ()
No symbol table info available.
#3  0x0000000000000007 in ?? ()
No symbol table info available.
#4  0x0000000000000000 in ?? ()
No symbol table info available.
(gdb) thread apply all bt full

Thread 2 (Thread 0x7fffee4c6700 (LWP 5546)):
#0  0x00007ffff3d7a07f in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
No symbol table info available.
#1  0x00007ffff22fe04a in ?? () from /usr/lib/xorg/modules/dri/r600_dri.so
No symbol table info available.
#2  0x00007ffff22fd787 in ?? () from /usr/lib/xorg/modules/dri/r600_dri.so
No symbol table info available.
#3  0x00007ffff3d744a4 in start_thread () from /usr/lib/libpthread.so.0
No symbol table info available.
#4  0x00007ffff704d13d in clone () from /usr/lib/libc.so.6
No symbol table info available.

Thread 1 (Thread 0x7ffff7f9a740 (LWP 5542)):
#0  0x00007fffedaa55eb in ?? ()
No symbol table info available.
#1  0x000000000076a340 in ?? ()
No symbol table info available.
#2  0x00007fffffffd630 in ?? ()
No symbol table info available.
#3  0x0000000000000007 in ?? ()
No symbol table info available.
#4  0x0000000000000000 in ?? ()
No symbol table info available.