From: Eric Wong <normalperson@...>
Date: 2018-12-21T22:39:06+00:00
Subject: [ruby-core:90669] Re: [Ruby trunk Bug#15430][Assigned] test_fork_while_parent_locked is failing status on Ruby CI

Fwiw, I think the bug is in rb_mutex_abandon_locking_mutex,
it needs to clear the waitq unconditionally; but not touch
mutex->th or mutex->next_mutex:

  https://80x24.org/spew/20181221223422.9219-1-e@80x24.org/raw

And as a result, rb_mutex_cleanup_keeping_mutexes is redundant.

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