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BUG: KCSAN: data-race in acct_collect / do_exit

write to 0xffff88810dbba4f4 of 4 bytes by task 7556 on cpu 0:
 reparent_leader kernel/exit.c:599 [inline]
 forget_original_parent kernel/exit.c:651 [inline]
 exit_notify kernel/exit.c:667 [inline]
 do_exit+0x951/0x1630 kernel/exit.c:843
 do_group_exit+0xc8/0x170 kernel/exit.c:920
 get_signal+0xd5e/0x1440 kernel/signal.c:2770
 arch_do_signal_or_restart+0x2a/0x270 arch/x86/kernel/signal.c:811
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x109/0x1a0 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810dbba4f4 of 4 bytes by task 7555 on cpu 1:
 thread_group_leader include/linux/sched/signal.h:667 [inline]
 acct_collect+0x163/0x3c0 kernel/acct.c:553
 do_exit+0x37a/0x1630 kernel/exit.c:802
 do_group_exit+0xa0/0x170 kernel/exit.c:920
 __do_sys_exit_group+0xb/0x10 kernel/exit.c:931
 __se_sys_exit_group+0x5/0x10 kernel/exit.c:929
 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:929
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7555 Comm: syz-executor.3 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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