https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206384

--- Comment #1 from Ed Maste <[email protected]> ---
This is happening because libunwind steps on the thread stack guard page.

libpolyml/sighandler.cpp for the signal handler thread calls
pthread_attr_setstacksize(min(4096, PTHREAD_STACK_MIN)) - on FreeBSD/x86
PTHREAD_STACK_MIN is 2k so we end up with the 4k min, but it seems
llvm-libunwind needs more stack space for the _Unwind_ForcedUnwind.

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