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BUG: KCSAN: data-race in io_req_defer_failed / io_wq_free_work

write to 0xffff88812221cc48 of 8 bytes by task 4115 on cpu 1:
 io_req_defer_failed+0x6f/0x420 io_uring/io_uring.c:929
 io_req_task_cancel+0x21/0x30 io_uring/io_uring.c:1362
 io_handle_tw_list+0x1b9/0x200 io_uring/io_uring.c:1059
 tctx_task_work_run+0x6e/0x1c0 io_uring/io_uring.c:1123
 tctx_task_work+0x40/0x80 io_uring/io_uring.c:1141
 task_work_run+0x13a/0x1a0 kernel/task_work.c:227
 get_signal+0xe78/0x1000 kernel/signal.c:2809
 arch_do_signal_or_restart+0x95/0x4b0 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]
 irqentry_exit_to_user_mode+0xa7/0x120 kernel/entry/common.c:231
 irqentry_exit+0x12/0x50 kernel/entry/common.c:334
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707

read to 0xffff88812221cc48 of 8 bytes by task 4116 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+0x4cb/0x9d0 io_uring/io-wq.c:604
 io_wq_worker+0x286/0x820 io_uring/io-wq.c:655
 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: 0x0000000000580071 -> 0x0000000000d80131

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 4116 Comm: iou-wrk-4115 Not tainted 6.14.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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