.
Thread 2 (process 5930):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7566893 in poll () from /lib/tls/i686/cmov/libc.so.6
#2  0xb7e3cc29 in PR_Poll () from /usr/lib/mozilla-thunderbird/libnspr4.so
#3  0xb7e4362d in ?? () from /usr/lib/mozilla-thunderbird/libnspr4.so
#4  0xb27fd2fc in ?? ()
#5  0x00000001 in ?? ()
#6  0xffffffff in ?? ()
#7  0xb7df7451 in pthread_mutex_lock ()
   from /lib/tls/i686/cmov/libpthread.so.0
#8  0xb7e40e9d in ?? () from /usr/lib/mozilla-thunderbird/libnspr4.so
#9  0x00000000 in ?? ()
.
Thread 1 (process 5898):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7dfd4f1 in raise () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x08058596 in ?? ()
#3  0x0000000b in ?? ()
#4  0xbfa5e6bc in ?? ()
#5  0x00000000 in ?? ()