From: Eric Wong <normalperson@...>
Date: 2018-07-30T21:40:12+00:00
Subject: [ruby-core:88218] Re: [Ruby trunk Bug#14945] [PATCH] thread.c (blocking_region_end): clear ubf before unregister_ubf_list

> https://bugs.ruby-lang.org/issues/14945

Actually, r64083 may not be completely safe, either, as
the list_empty checks are dangerous, at least w/o GVL.

However, this order must be enforced:

	unblock_function_clear
	unregister_ubf_list

Working on fixes...

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