Something

(gdb) bt
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7e4e726 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0xb7f307b0 in threads_join_all_threads () at threads.c:1252
#3  0xb7ec184c in vm_destroy (vm=0x804b060) at vm.c:1282
#4  0x080497c0 in main (argc=5, argv=0xbfb70754) at cacao.c:325
(gdb) fr 2
#2  0xb7f307b0 in threads_join_all_threads () at threads.c:1252
1252                            pthread_cond_wait(&thread->joincond, &thread->joinmutex);