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BUG: KCSAN: data-race in do_timer_create / do_timer_create

write to 0xffff888103dd00c4 of 4 bytes by task 9737 on cpu 0:
 do_timer_create+0x359/0xa90 kernel/time/posix-timers.c:516
 __se_sys_timer_create kernel/time/posix-timers.c:577 [inline]
 __x64_sys_timer_create+0xb7/0xe0 kernel/time/posix-timers.c:577
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888103dd00c4 of 4 bytes by task 9742 on cpu 1:
 posix_timer_add kernel/time/posix-timers.c:143 [inline]
 do_timer_create+0x1c0/0xa90 kernel/time/posix-timers.c:516
 __se_sys_timer_create kernel/time/posix-timers.c:577 [inline]
 __x64_sys_timer_create+0xb7/0xe0 kernel/time/posix-timers.c:577
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000020 -> 0x0000002a

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9742 Comm: syz-executor.0 Not tainted 5.19.0-syzkaller-02858-ge2b542100719-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
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