syzbot

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BUG: KCSAN: data-race in __io_async_wake / futex_wait_queue_me

read-write to 0xffff888041450024 of 4 bytes by task 9131 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+0x17e/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 0xffff888041450024 of 4 bytes by task 9127 on cpu 0:
 io_req_task_work_add fs/io_uring.c:2007 [inline]
 __io_async_wake+0x188/0x370 fs/io_uring.c:4891
 io_poll_wake+0x2d/0x40 fs/io_uring.c:5363
 __wake_up_common+0xbc/0x130 kernel/sched/wait.c:93
 __wake_up_common_lock kernel/sched/wait.c:123 [inline]
 __wake_up+0x80/0xc0 kernel/sched/wait.c:142
 pipe_release+0x102/0x1c0 fs/pipe.c:711
 __fput+0x243/0x4d0 fs/file_table.c:281
 ____fput+0x11/0x20 fs/file_table.c:314
 task_work_run+0x8e/0x110 kernel/task_work.c:151
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:164 [inline]
 exit_to_user_mode_prepare+0x13c/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: 0 PID: 9127 Comm: syz-executor.3 Not tainted 5.10.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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