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BUG: KCSAN: data-race in do_notify_parent_cldstop / do_signal_stop

write to 0xffff888138a1fb60 of 4 bytes by task 8296 on cpu 1:
 do_signal_stop+0xfb/0x660 kernel/signal.c:2427
 get_signal+0x61d/0x1020 kernel/signal.c:2816
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:867
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:166
 exit_to_user_mode_prepare kernel/entry/common.c:201 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:294
 ret_from_fork+0x15/0x30

read to 0xffff888138a1fb60 of 4 bytes by task 8280 on cpu 0:
 do_notify_parent_cldstop+0x19b/0x280
 get_signal+0xa65/0x1020 kernel/signal.c:2685
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:867
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:166
 exit_to_user_mode_prepare kernel/entry/common.c:201 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:294
 do_syscall_64+0x37/0x70 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: 8280 Comm: syz-executor.3 Not tainted 5.18.0-rc7-syzkaller-00185-g978df3e15846-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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