[Bug 243746] backtrace() not returning any stack frames [12.1-RELEASE-p1 amd64]

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243746

Conrad Meyer <cem at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|12.1-RELEASE                |CURRENT
                 CC|                            |cem at freebsd.org

--- Comment #1 from Conrad Meyer <cem at freebsd.org> ---
Yeah, our libunwind doesn't know how to backtrace out of a signal handler at
this time.  I have a WIP patch to unwind starting from a `ucontext`, which
signal handlers created with sigaction(2) can access, but I haven't had time to
work on it for a while; it would also require slightly different code in the
signal handler.

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