musl: fix locking synchronization bug
authorMatthias Schiffer <mschiffer@universe-factory.net>
Sat, 23 May 2020 19:16:44 +0000 (21:16 +0200)
committerMatthias Schiffer <mschiffer@universe-factory.net>
Tue, 26 May 2020 21:45:16 +0000 (23:45 +0200)
Import proposed upstream fix [2] for the critical locking
synchronization bug recently found in musl [1].

This affects all programs that are temporarily multithreaded, but then
return to single-threaded operation.

[1] https://www.openwall.com/lists/musl/2020/05/22/3
[2] https://www.openwall.com/lists/musl/2020/05/22/10

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

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