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BUG: KCSAN: data-race in acct_collect / do_exit

write to 0xffff88807ee9f49c of 4 bytes by task 31657 on cpu 0:
 reparent_leader kernel/exit.c:582 [inline]
 forget_original_parent kernel/exit.c:634 [inline]
 exit_notify kernel/exit.c:650 [inline]
 do_exit+0x8de/0x15a0 kernel/exit.c:826
 do_group_exit+0xc8/0x170 kernel/exit.c:903
 get_signal+0xf9b/0x1510 kernel/signal.c:2758
 arch_do_signal+0x25/0x260 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
 exit_to_user_mode_prepare+0xde/0x170 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:266
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88807ee9f49c of 4 bytes by task 31658 on cpu 1:
 thread_group_leader include/linux/sched/signal.h:654 [inline]
 acct_collect+0x14c/0x360 kernel/acct.c:556
 do_exit+0x373/0x15a0 kernel/exit.c:785
 __seccomp_filter+0xe40/0xe60 kernel/seccomp.c:1038
 __secure_computing+0x12e/0x1c0 kernel/seccomp.c:1074
 syscall_trace_enter+0x106/0x290 kernel/entry/common.c:58
 __syscall_enter_from_user_work kernel/entry/common.c:81 [inline]
 syscall_enter_from_user_mode+0x1d/0x20 kernel/entry/common.c:99
 do_syscall_64+0x11/0x80 arch/x86/entry/common.c:41
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 31658 Comm: syz-executor.1 Not tainted 5.10.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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