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BUG: KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests

write to 0xffff888118a671b8 of 8 bytes by task 13944 on cpu 1:
 io_sq_thread+0xb19/0xc00 fs/io_uring.c:7635
 ret_from_fork+0x1f/0x30

read to 0xffff888118a671b8 of 8 bytes by task 2147 on cpu 0:
 io_uring_try_cancel_requests+0x1ab/0x308 fs/io_uring.c:9775
 io_ring_exit_work+0x79/0x3c7 fs/io_uring.c:9571
 process_one_work+0x3f6/0x960 kernel/workqueue.c:2307
 worker_thread+0x616/0xa70 kernel/workqueue.c:2454
 kthread+0x1bf/0x1e0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30

value changed: 0xffff88810262c500 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2147 Comm: kworker/u4:55 Not tainted 5.17.0-rc3-syzkaller-00329-g42964a18f81c-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound io_ring_exit_work
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