Eli Zaretskii writes:

[...]
>
> So I still think a backtrace from an unoptimized build, where I can
> see the exact locus of the crash and ask for values of some variables,
> would be the fastest path to finding the culprit.
>

Please find attached the result of `bt full' from an unoptimized build.

>
> Thanks.
>

Thanks again.