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BUG: KCSAN: data-race in do_exit / futex_wait_queue_me

read-write to 0xffff88801e0ff064 of 4 bytes by task 30526 on cpu 0:
 freezer_count include/linux/freezer.h:121 [inline]
 freezable_schedule include/linux/freezer.h:173 [inline]
 futex_wait_queue_me+0x198/0x240 kernel/futex.c:2604
 futex_wait+0x145/0x390 kernel/futex.c:2706
 do_futex+0x10ff/0x2140 kernel/futex.c:3765
 __do_sys_futex kernel/futex.c:3828 [inline]
 __se_sys_futex+0x2a8/0x390 kernel/futex.c:3794
 __x64_sys_futex+0x74/0x80 kernel/futex.c:3794
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88801e0ff064 of 4 bytes by task 30535 on cpu 1:
 find_alive_thread kernel/exit.c:496 [inline]
 find_new_reaper kernel/exit.c:545 [inline]
 forget_original_parent kernel/exit.c:620 [inline]
 exit_notify kernel/exit.c:653 [inline]
 do_exit+0x53c/0x1630 kernel/exit.c:829
 do_group_exit+0xc8/0x170 kernel/exit.c:906
 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 30535 Comm: syz-executor.1 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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