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BUG: KCSAN: data-race in acct_collect / do_exit

write to 0xffff88818fb8a50c of 4 bytes by task 23200 on cpu 1:
 reparent_leader kernel/exit.c:601 [inline]
 forget_original_parent kernel/exit.c:653 [inline]
 exit_notify kernel/exit.c:669 [inline]
 do_exit+0x981/0x1560 kernel/exit.c:846
 do_group_exit+0xce/0x1a0 kernel/exit.c:923
 get_signal+0xfc3/0x1610 kernel/signal.c:2818
 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:789
 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+0x109/0x190 kernel/entry/common.c:208
 irqentry_exit_to_user_mode+0x5/0x20 kernel/entry/common.c:314
 irqentry_exit+0xe/0x30 kernel/entry/common.c:405
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577

read to 0xffff88818fb8a50c of 4 bytes by task 23202 on cpu 0:
 thread_group_leader include/linux/sched/signal.h:667 [inline]
 acct_collect+0x161/0x420 kernel/acct.c:553
 do_exit+0x3b1/0x1560 kernel/exit.c:805
 do_group_exit+0xce/0x1a0 kernel/exit.c:923
 get_signal+0xfc3/0x1610 kernel/signal.c:2818
 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:789
 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+0x109/0x190 kernel/entry/common.c:208
 irqentry_exit_to_user_mode+0x5/0x20 kernel/entry/common.c:314
 exc_debug_user arch/x86/kernel/traps.c:992 [inline]
 noist_exc_debug+0xec/0x120 arch/x86/kernel/traps.c:1005
 asm_exc_debug+0x2b/0x30 arch/x86/include/asm/idtentry.h:613

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 23202 Comm: syz-executor.5 Tainted: G        W         5.13.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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