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BUG: KCSAN: data-race in futex_wait_queue_me / io_req_task_work_add

write to 0xffff888009a6f02c of 4 bytes by task 24066 on cpu 1:
 freezer_do_not_count include/linux/freezer.h:109 [inline]
 freezable_schedule include/linux/freezer.h:171 [inline]
 futex_wait_queue_me+0x186/0x250 kernel/futex.c:2606
 futex_wait+0x145/0x3d0 kernel/futex.c:2708
 do_futex+0x1062/0x1cd0 kernel/futex.c:3735
 __do_sys_futex kernel/futex.c:3798 [inline]
 __se_sys_futex+0x2a8/0x390 kernel/futex.c:3764
 __x64_sys_futex+0x74/0x80 kernel/futex.c:3764
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888009a6f02c of 4 bytes by task 24163 on cpu 0:
 io_req_task_work_add+0x2c/0x320 fs/io_uring.c:1908
 io_free_req_deferred fs/io_uring.c:2128 [inline]
 io_put_req_deferred fs/io_uring.c:2136 [inline]
 io_poll_remove_one+0x54a/0x650 fs/io_uring.c:5217
 io_poll_remove_all fs/io_uring.c:5240 [inline]
 io_ring_ctx_wait_and_kill+0x1fe/0x340 fs/io_uring.c:8584
 io_uring_release+0x3e/0x50 fs/io_uring.c:8604
 __fput+0x263/0x4f0 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0x8e/0x110 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x17c/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

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 24163 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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