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BUG: KCSAN: data-race in do_notify_parent_cldstop / do_signal_stop

write to 0xffff888134bbee20 of 4 bytes by task 10150 on cpu 1:
 do_signal_stop+0xfb/0x800 kernel/signal.c:2427
 get_signal+0x77a/0x15a0 kernel/signal.c:2816
 arch_do_signal_or_restart+0x87/0x2b0 arch/x86/kernel/signal.c:867
 exit_to_user_mode_loop kernel/entry/common.c:166 [inline]
 exit_to_user_mode_prepare+0xc1/0x140 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:294
 do_syscall_64+0x37/0x50 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888134bbee20 of 4 bytes by task 10156 on cpu 0:
 do_notify_parent_cldstop+0x1c1/0x290
 get_signal+0xd78/0x15a0 kernel/signal.c:2685
 arch_do_signal_or_restart+0x87/0x2b0 arch/x86/kernel/signal.c:867
 exit_to_user_mode_loop kernel/entry/common.c:166 [inline]
 exit_to_user_mode_prepare+0xc1/0x140 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:294
 do_syscall_64+0x37/0x50 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000 -> 0x00000014

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10156 Comm: syz-executor.0 Not tainted 5.18.0-rc1-syzkaller-00009-gce4c854ee868-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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