[Bug 278703] Forking on 13.3 restricting to same CPU core

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278703

--- Comment #5 from cbl@cbl.us ---
More troubleshooting.. 

This issue is occurring on /usr/lib/libomp.so with llvm17, which is the default
with FreeBSD 13.3.

I installed a few other llvm's via pkg (and even compiled llvm-devel 19.x) to
test things.  When I copy over the libomp.so from llvm14 or llvm15 into
/usr/lib/ the application starts using all the CPU cores as expected.   So
something changed in llvm16 and later that is causing our linked application
(ImageMagick) to limit itself to a single cpu core.  Since FreeBSD 13.2 was
still using llvm14 by default, the problem was not occurring then.

llvm14-14.0.6_5 - WORKS
llvm15-15.0.7_10 - WORKS
llvm16-16.0.6_10  - BROKE
llvm17-17.0.6 (13.3 default) - BROKE
llvm19-19.0.d20240426 - BROKE

I'd welcome input on what to try next, or what to report to the LLVM group to
fix the issue.

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