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BUG: KCSAN: data-race in futex_wait_queue_me / io_req_task_work_add

write to 0xffff8881209bc0ac of 4 bytes by task 19314 on cpu 0:
 freezer_do_not_count include/linux/freezer.h:109 [inline]
 freezable_schedule include/linux/freezer.h:171 [inline]
 futex_wait_queue_me+0x198/0x260 kernel/futex.c:2606
 futex_wait+0x143/0x430 kernel/futex.c:2708
 do_futex+0x9d8/0x1ee0 kernel/futex.c:3732
 __do_sys_futex kernel/futex.c:3805 [inline]
 __se_sys_futex+0x21c/0x380 kernel/futex.c:3786
 __x64_sys_futex+0x74/0x80 kernel/futex.c:3786
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881209bc0ac of 4 bytes by task 19318 on cpu 1:
 io_req_task_work_add+0x3f/0x310 fs/io_uring.c:1937
 io_free_req_deferred fs/io_uring.c:2187 [inline]
 io_put_req_deferred fs/io_uring.c:2194 [inline]
 io_fail_links+0x112/0x240 fs/io_uring.c:1817
 io_disarm_next+0x234/0x2b0 fs/io_uring.c:1832
 __io_req_find_next fs/io_uring.c:1853 [inline]
 io_req_find_next fs/io_uring.c:1869 [inline]
 io_put_req_find_next+0xe5/0x150 fs/io_uring.c:2165
 io_free_work+0x18/0x30 fs/io_uring.c:7852
 io_worker_handle_work+0x927/0xaf0 fs/io-wq.c:499
 io_wqe_worker+0x1c5/0x550 fs/io-wq.c:545
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

value changed: 0x00404140 -> 0x40404140

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19318 Comm: iou-wrk-19314 Not tainted 5.13.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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