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BUG: KCSAN: data-race in do_notify_parent_cldstop / do_signal_stop

write to 0xffff888157d2dba0 of 4 bytes by task 2551 on cpu 1:
 do_signal_stop+0xfc/0x580 kernel/signal.c:2420
 get_signal+0x423/0xc60 kernel/signal.c:2810
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:168
 exit_to_user_mode_prepare kernel/entry/common.c:203 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:296
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888157d2dba0 of 4 bytes by task 2550 on cpu 0:
 do_notify_parent_cldstop+0x19b/0x280
 get_signal+0x6b5/0xc60 kernel/signal.c:2679
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:168
 exit_to_user_mode_prepare kernel/entry/common.c:203 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:296
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000 -> 0x00000014

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2550 Comm: syz-executor.1 Not tainted 6.1.0-rc1-syzkaller-00025-gaae703b02f92-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
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