syzbot

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BUG: KCSAN: data-race in futex_wait_queue_me / io_req_task_work_add

write to 0xffff8881248f902c of 4 bytes by task 8502 on cpu 1:
 freezer_count include/linux/freezer.h:121 [inline]
 freezable_schedule include/linux/freezer.h:173 [inline]
 futex_wait_queue_me+0x1ba/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 0xffff8881248f902c of 4 bytes by task 8496 on cpu 0:
 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_poll_remove_one fs/io_uring.c:5245 [inline]
 io_poll_remove_all+0x4b5/0x670 fs/io_uring.c:5268
 io_ring_ctx_wait_and_kill+0x15c/0x210 fs/io_uring.c:8821
 io_uring_release+0x3e/0x50 fs/io_uring.c:8841
 __fput+0x25b/0x4e0 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0xae/0x130 kernel/task_work.c:164
 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+0x156/0x190 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+0x56/0x90 arch/x86/entry/common.c:57
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x40404140 -> 0x00404140

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8496 Comm: syz-executor.4 Not tainted 5.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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