`test_faulthandler.test_register_chain` hangs under TSAN

[colesbury]

Bug report

Run with:

TSAN_OPTIONS=suppressions=Tools/tsan/suppressions.txt handle_segv=0 ./python -m test test_faulthandler -m test_register_chain -v

This was in the default (GIL-enabled build).

There's some sort of infinite loop between TSAN's interception of kill() and our attempt to pass the signal to the previous signal handler.

I think we should just skip the test under TSAN. I'm not sure it's worth investigating too deeply.

Linked PRs

• gh-129825: Skip test_faulthandler.test_register_chain under TSAN #129827