syzbot

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BUG: KCSAN: data-race in io_req_defer_failed / io_wq_free_work

write to 0xffff8881206fb648 of 8 bytes by task 3721 on cpu 1:
 req_set_fail io_uring/io_uring.h:-1 [inline]
 io_req_defer_failed+0x6f/0x430 io_uring/io_uring.c:929
 io_req_task_cancel+0x21/0x30 io_uring/io_uring.c:1362
 io_handle_tw_list+0x1bb/0x210 io_uring/io_uring.c:1059
 tctx_task_work_run+0x6e/0x1c0 io_uring/io_uring.c:1123
 tctx_task_work+0x44/0x80 io_uring/io_uring.c:1141
 task_work_run+0x13c/0x1b0 kernel/task_work.c:227
 get_signal+0xe81/0x1000 kernel/signal.c:2808
 arch_do_signal_or_restart+0x9a/0x4b0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x62/0x120 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881206fb648 of 8 bytes by task 3728 on cpu 0:
 req_ref_put_and_test io_uring/refs.h:22 [inline]
 io_wq_free_work+0x24/0x1b0 io_uring/io_uring.c:1777
 io_worker_handle_work+0x4d1/0x9d0 io_uring/io-wq.c:604
 io_wq_worker+0x28c/0x820 io_uring/io-wq.c:655
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x0000000000580071 -> 0x0000000000d80131

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3728 Comm: iou-wrk-3721 Not tainted 6.14.0-syzkaller-03576-g1e1ba8d23dae #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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