.
Thread 3 (process 6372):
#0  0xb7b76e3e in free () from /lib/tls/i686/cmov/libc.so.6
#1  0xb7ce1e68 in _XFreeDisplayStructure () from /usr/lib/libX11.so.6
#2  0xb7cceefa in XCloseDisplay () from /usr/lib/libX11.so.6
#3  0xb7e111bf in ?? () from /usr/lib/libgdk-1.2.so.0
#4  0x0813c120 in ?? ()
#5  0xb7c48ff4 in ?? () from /lib/tls/i686/cmov/libc.so.6
#6  0xb7a0be98 in ?? ()
#7  0xb7b389d9 in exit () from /lib/tls/i686/cmov/libc.so.6
Backtrace stopped: frame did not save the PC
.
Thread 2 (process 6373):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7dcd5ce in sem_wait@GLIBC_2.0 ()
   from /lib/tls/i686/cmov/libpthread.so.0
#2  0x0804c57e in display ()
#3  0xb7dc731b in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#4  0xb7bdb57e in clone () from /lib/tls/i686/cmov/libc.so.6
.
Thread 1 (process 6368):
#0  0x00040018 in ?? ()
#1  0xb7cfc5f8 in _X11TransBytesReadable () from /usr/lib/libX11.so.6
#2  0xb7cf4fe8 in _XEventsQueued () from /usr/lib/libX11.so.6
#3  0xb7ce3dd2 in XPending () from /usr/lib/libX11.so.6
#4  0xb7e1d174 in ?? () from /usr/lib/libgdk-1.2.so.0
#5  0x0813c120 in ?? ()
#6  0xb7dfe144 in ?? () from /usr/lib/libglib-1.2.so.0
#7  0xb7dcabe0 in ?? () from /lib/tls/i686/cmov/libpthread.so.0
#8  0x081444e0 in ?? ()
#9  0xb7dfe144 in ?? () from /usr/lib/libglib-1.2.so.0
#10 0xb7dcabe0 in ?? () from /lib/tls/i686/cmov/libpthread.so.0
#11 0xbfbd8928 in ?? ()
#12 0xb7debfe8 in ?? () from /usr/lib/libglib-1.2.so.0
#13 0x00000000 in ?? ()