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BUG: KCSAN: data-race in acct_collect / do_exit

write to 0xffff8880277fc4f4 of 4 bytes by task 18259 on cpu 0:
 reparent_leader kernel/exit.c:600 [inline]
 forget_original_parent kernel/exit.c:652 [inline]
 exit_notify kernel/exit.c:668 [inline]
 do_exit+0x991/0x1670 kernel/exit.c:845
 do_group_exit+0xce/0x180 kernel/exit.c:922
 get_signal+0xdce/0x14e0 kernel/signal.c:2773
 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+0x11a/0x1b0 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8880277fc4f4 of 4 bytes by task 18265 on cpu 1:
 thread_group_leader include/linux/sched/signal.h:667 [inline]
 acct_collect+0x161/0x400 kernel/acct.c:553
 do_exit+0x3b1/0x1670 kernel/exit.c:804
 do_group_exit+0xce/0x180 kernel/exit.c:922
 get_signal+0xdce/0x14e0 kernel/signal.c:2773
 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+0x11a/0x1b0 kernel/entry/common.c:208
 irqentry_exit_to_user_mode+0x5/0x20 kernel/entry/common.c:314
 irqentry_exit+0xe/0x40 kernel/entry/common.c:405
 exc_general_protection+0x214/0x360 arch/x86/kernel/traps.c:530
 asm_exc_general_protection+0x1e/0x30 arch/x86/include/asm/idtentry.h:571

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 18265 Comm: syz-executor.1 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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