10c211031c
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>