[Bug libgcc/127112] _Unwind_Backtrace faults on CFI-derived addresses

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127112

--- Comment #4 from Drea Pinski <pinskia at gcc dot gnu.org> ---
Part of the problem is if we need to probe addresses that becomes expensive as
it is a full blown system call.