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b20a95f181
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> (cherry picked from commit 10c211031ccd4703230493025a5a3b9d6fcad2f2)