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BUG: KCSAN: data-race in do_group_exit / do_group_exit

write to 0xffff88815a87c4f4 of 4 bytes by task 643 on cpu 1:
 do_group_exit+0xd6/0x150 kernel/exit.c:1018
 __do_sys_exit_group kernel/exit.c:1035 [inline]
 __se_sys_exit_group kernel/exit.c:1033 [inline]
 __x64_sys_exit_group+0x1f/0x20 kernel/exit.c:1033
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88815a87c4f4 of 4 bytes by task 644 on cpu 0:
 do_group_exit+0x3e/0x150 kernel/exit.c:1003
 __do_sys_exit_group kernel/exit.c:1035 [inline]
 __se_sys_exit_group kernel/exit.c:1033 [inline]
 __x64_sys_exit_group+0x1f/0x20 kernel/exit.c:1033
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000002 -> 0x00000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 644 Comm: syz-executor.2 Not tainted 6.5.0-rc6-syzkaller-00225-gaa9ea98cca3a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
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