libexecinfo backtrace() in a signal handler

[Joerg Sonnenberger]

On Thu, Jul 06, 2017 at 03:58:04PM -0700, Conrad Meyer wrote:
> Signal handlers use a special stack frame that libexecinfo is too
> simple to understand.  To get a stack from a signal handler, you might
> want to use libunwind instead.

Actually, that's not the problem. The problem is that nothing registers
the necessary unwind data.

Joerg