In SoundPlayer, if I select File->Open, the app will often freeze, with System Monitor reporting the main and background threads' State as Futex.
I've reproduced this with TextEditor, using File->Open along with the toolbar button, but after a few attempts it did seem to be (possibly) less reproducible there. It may have also been a coincidence that it worked a few times in a row. :^)
It also happened in GMLPlayground after 3 attempts:
This occurs with both GNU and Clang toolchains.
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