syzbot

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BUG: KCSAN: data-race in io_sq_thread / io_sq_thread_stop

write to 0xffff88811875d878 of 8 bytes by task 17246 on cpu 0:
 io_sq_thread+0xe98/0x1100 io_uring/sqpoll.c:382
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffff88811875d878 of 8 bytes by task 4792 on cpu 1:
 io_sq_thread_stop+0x1d/0xd0 io_uring/sqpoll.c:60
 io_put_sq_data io_uring/sqpoll.c:76 [inline]
 io_sq_thread_finish+0x252/0x2d0 io_uring/sqpoll.c:101
 io_ring_ctx_free+0x1a/0x3d0 io_uring/io_uring.c:2698
 io_ring_exit_work+0x4d9/0x510 io_uring/io_uring.c:2939
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0x4db/0xa20 kernel/workqueue.c:3317
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3398
 kthread+0x4ae/0x520 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0xffff88810306a100 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 4792 Comm: kworker/u8:9 Not tainted 6.14.0-rc3-syzkaller-00096-ge9a8cac0bf89 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: iou_exit io_ring_exit_work
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