In the Linux kernel, the following vulnerability has been resolved: locking/spinlock/debug: Fix data-race in dorawwritelock KCSAN reports: BUG: KCSAN: data-race in dorawwritelock / dorawwritelock write (marked) to 0xffff800009cf504c of 4 bytes by task 1102 on cpu 1: dorawwritelock+0x120/0x204 rawwritelockirq doexit callusermodehelperexecasync retfromfork read to 0xffff800009cf504c of 4 bytes by task 1103 on cpu 0: dorawwritelock+0x88/0x204 _rawwritelockirq doexit callusermodehelperexecasync retfromfork value changed: 0xffffffff -> 0x00000001 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1103 Comm: kworker/u4:1 6.1.111 Commit 1a365e822372 ("locking/spinlock/debug: Fix various data races") has adressed most of these races, but seems to be not consistent/not complete. >From dorawwritelock() only debugwritelockafter() part has been converted to WRITEONCE(), but not debugwritelockbefore() part. Do it now.