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BUG: KCSAN: data-race in do_mq_timedreceive / msg_insert

write to 0xffff888129971308 of 8 bytes by task 23271 on cpu 0:
 msg_insert+0x10a/0x2e0 ipc/mqueue.c:213
 do_mq_timedsend+0x452/0xaa0 ipc/mqueue.c:1149
 __do_sys_mq_timedsend ipc/mqueue.c:1284 [inline]
 __se_sys_mq_timedsend ipc/mqueue.c:1273 [inline]
 __x64_sys_mq_timedsend+0xc9/0x140 ipc/mqueue.c:1273
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888129971308 of 8 bytes by task 23253 on cpu 1:
 do_mq_timedreceive+0x1f8/0x780 ipc/mqueue.c:1219
 __do_sys_mq_timedreceive ipc/mqueue.c:1298 [inline]
 __se_sys_mq_timedreceive ipc/mqueue.c:1287 [inline]
 __x64_sys_mq_timedreceive+0xc9/0x140 ipc/mqueue.c:1287
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffff888129a50f40 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 23253 Comm: syz-executor.3 Not tainted 5.15.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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