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BUG: KCSAN: data-race in do_timer_create / do_timer_create

write to 0xffff88813df7c0bc of 4 bytes by task 26662 on cpu 1:
 posix_timer_add kernel/time/posix-timers.c:154 [inline]
 do_timer_create+0x349/0xad0 kernel/time/posix-timers.c:516
 __do_sys_timer_create kernel/time/posix-timers.c:586 [inline]
 __se_sys_timer_create kernel/time/posix-timers.c:577 [inline]
 __x64_sys_timer_create+0xa3/0xd0 kernel/time/posix-timers.c:577
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88813df7c0bc of 4 bytes by task 26674 on cpu 0:
 posix_timer_add kernel/time/posix-timers.c:143 [inline]
 do_timer_create+0x1b5/0xad0 kernel/time/posix-timers.c:516
 __do_sys_timer_create kernel/time/posix-timers.c:586 [inline]
 __se_sys_timer_create kernel/time/posix-timers.c:577 [inline]
 __x64_sys_timer_create+0xa3/0xd0 kernel/time/posix-timers.c:577
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 26674 Comm: syz-executor.5 Not tainted 5.13.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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