.
Thread 1 (process 5251):
#0  0xb75169a4 in ?? () from /lib/tls/i686/cmov/libc.so.6
#1  0xb75f8bf0 in pthread_mutex_unlock ()
   from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb751860e in malloc () from /lib/tls/i686/cmov/libc.so.6
#3  0xb751a0d6 in realloc () from /lib/tls/i686/cmov/libc.so.6
#4  0xb78b1ea4 in ?? () from /usr/lib/libcairo.so.2
#5  0x00000000 in ?? ()