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Correctly clean up
keeping_mutexes
before resuming any other threads.
It's possible (but very rare) to have a race condition between setting `mutex->fiber = NULL` and `thread_mutex_remove(th, mutex)` which results in the following bug: ``` [BUG] invalid keeping_mutexes: Attempt to unlock a mutex which is not locked ``` Fixes <https://bugs.ruby-lang.org/issues/19480>.
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