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BUG: KCSAN: data-race in do_notify_parent_cldstop / prepare_signal

write to 0xffff888103bc0de0 of 4 bytes by interrupt on cpu 1:
 prepare_signal+0x522/0x7b0 kernel/signal.c:961
 send_sigqueue+0xea/0x430 kernel/signal.c:1969
 posix_timer_event kernel/time/posix-timers.c:354 [inline]
 posix_timer_fn+0xe8/0x210 kernel/time/posix-timers.c:380
 __run_hrtimer+0x163/0x460 kernel/time/hrtimer.c:1685
 __hrtimer_run_queues kernel/time/hrtimer.c:1749 [inline]
 hrtimer_interrupt+0x37e/0xac0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0xa3/0x240 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x88/0xb0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20
 find_watchpoint kernel/kcsan/core.c:134 [inline]
 check_access kernel/kcsan/core.c:726 [inline]
 __tsan_read4+0x33/0x180 kernel/kcsan/core.c:1013
 complete_walk+0x57/0x1e0 fs/namei.c:879
 path_parentat fs/namei.c:2548 [inline]
 filename_parentat+0x145/0x480 fs/namei.c:2569
 do_unlinkat+0x83/0x540 fs/namei.c:4189
 __do_sys_unlink fs/namei.c:4266 [inline]
 __se_sys_unlink fs/namei.c:4264 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4264
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888103bc0de0 of 4 bytes by task 3559 on cpu 0:
 do_notify_parent_cldstop+0x1c1/0x290
 do_signal_stop+0x634/0x800 kernel/signal.c:2464
 get_signal+0xc76/0x15b0 kernel/signal.c:2710
 arch_do_signal_or_restart+0x8c/0x2e0 arch/x86/kernel/signal.c:868
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x113/0x190 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300
 do_syscall_64+0x50/0xd0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000014 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3559 Comm: syz-executor.1 Not tainted 5.17.0-rc8-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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