fstack should be able to take a core file and produce a stack trace of it.
fixed? tested?
bash-3.2$ ./frysk/bindir/fstack core.$$ /bin/bash Task #1668 #0 0x00110402 in __kernel_vsyscall () from .../[vdso] #1 0x0807bfa8 in wait_for () from .../bash #2 0x0806eedd in execute_command_internal () from .../bash ... ... (tested in TestFstack)