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BUG: KCSAN: data-race in do_notify_parent_cldstop / do_signal_stop

write to 0xffff88810354d6e0 of 4 bytes by task 15774 on cpu 0:
 do_signal_stop+0xfc/0x570 kernel/signal.c:2420
 get_signal+0x423/0xc70 kernel/signal.c:2811
 arch_do_signal_or_restart+0x85/0x290 arch/x86/kernel/signal.c:306
 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 0xffff88810354d6e0 of 4 bytes by task 15770 on cpu 1:
 do_notify_parent_cldstop+0x18a/0x290 kernel/signal.c:2173
 get_signal+0x6b5/0xc70 kernel/signal.c:2679
 arch_do_signal_or_restart+0x85/0x290 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0x69/0x90 kernel/entry/common.c:203
 irqentry_exit_to_user_mode+0x5/0x10 kernel/entry/common.c:309
 irqentry_exit+0xe/0x40 kernel/entry/common.c:412
 sysvec_apic_timer_interrupt+0x4a/0xb0 arch/x86/kernel/apic/apic.c:1107
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649

value changed: 0x00000000 -> 0x00000014

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 15770 Comm: syz-executor.5 Tainted: G        W          6.2.0-rc5-syzkaller-00199-g5af6ce704936-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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