Incorrect unwind when throwing exceptions - possible cause?

[Florian Weimer]

* Juraj Oršulić:

> I have a hair-tearing problem with x86_64 gcc 9.3.0 (Ubuntu 20.04),
> -O2 and the following "minimal" example
> (the real minimal example also links in a bunch of 3rd party libraries
> and is a part of a big project, so I can't really provide a minimal example,
> but I slimmed it down to basically this):

Are you using the libgcc unwinder in the crashing case?  (And not
libunwind.)

Thanks,
Florian