We currently have a suppression for thread leaks in thread sanitizer:

It'd be nice to remove this suppression. There are a two sources of thread leaks that I know:

1. It configure.ac, one of the checks doesn't pthread_detach or pthread_join. This is easy to fix
2. Some of our multiprocessing tests leak threads. We should probably just skip these tests when running under TSan.

Linked PRs

• gh-143121: Avoid thread leak in configure #143122
• gh-143121: Skip test that leak threads under TSan #143125
• [3.14] gh-143121: Skip test that leak threads under TSan (gh-143125) #143141
• [3.13] gh-143121: Skip test that leak threads under TSan (gh-143125) #143142