On Thu, 30 Jul 2009, Alessandro Rubini wrote:

quoted

We're dealing with some complex (3rd party) applications and I like to see a
user task stack backtrace.

(Of course the way to go here is to use a debugger (gdb) and
  do a backtrace (with the coredump file).

Actually, you can intercept SIGSEGV and print your own stack from within
the signal handler. You can also open /proc/self/maps and print it, to
ease understanding the various pointers in there, especially if the
application is using a number of shared libs.

This is usually easier than getting to a core dump, although there is
less information than what the core offers.

I have the code for ARM and I've it on ppc once, but I must dig for the actual
code.

I think libSegFault.so (part of glibc) can do that by simply preloading it 

LD_PRELOAD=/lib/libSegFault.so ./your_segfaulting_app

should do the trick.

hofrat