[Bug libbacktrace/87653] Calling null pointer in multi-threaded applications

[antoshkka at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87653

--- Comment #2 from Antony Polukhin <antoshkka at gmail dot com> ---
Hmm... I can not reproduce the problem if I build the libbacktrace from sources
(even without the patch).

The problem appears only if I use libbacktrace from Ubuntu. I'll double check
and will try to find the cause of the problem.