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BUG: KCSAN: data-race in do_notify_parent_cldstop / do_signal_stop

write to 0xffff8881035d4960 of 4 bytes by task 3634 on cpu 1:
 do_signal_stop+0xfb/0x570 kernel/signal.c:2438
 get_signal+0x5c8/0xff0 kernel/signal.c:2829
 arch_do_signal_or_restart+0x89/0x2a0 arch/x86/kernel/signal.c:308
 exit_to_user_mode_loop+0x6f/0xe0 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:297
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881035d4960 of 4 bytes by task 3633 on cpu 0:
 do_notify_parent_cldstop+0x192/0x290 kernel/signal.c:2191
 get_signal+0xa1a/0xff0 kernel/signal.c:2697
 arch_do_signal_or_restart+0x89/0x2a0 arch/x86/kernel/signal.c:308
 exit_to_user_mode_loop+0x6f/0xe0 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204
 irqentry_exit_to_user_mode+0x9/0x20 kernel/entry/common.c:310
 irqentry_exit+0x12/0x40 kernel/entry/common.c:413
 sysvec_apic_timer_interrupt+0x42/0x80 arch/x86/kernel/apic/apic.c:1109
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645

value changed: 0x00000000 -> 0x00000013

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3633 Comm: syz-executor.4 Not tainted 6.4.0-syzkaller-10096-gdfab92f27c60 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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