syzbot

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BUG: KCSAN: data-race in io_req_defer_failed / io_wq_free_work

write to 0xffff88810e3abf48 of 8 bytes by task 20478 on cpu 1:
 io_req_defer_failed+0x73/0x440 io_uring/io_uring.c:922
 io_req_task_cancel+0x21/0x30 io_uring/io_uring.c:1335
 io_handle_tw_list+0x1b9/0x200 io_uring/io_uring.c:1052
 tctx_task_work_run+0x6e/0x1c0 io_uring/io_uring.c:1116
 tctx_task_work+0x40/0x80 io_uring/io_uring.c:1134
 task_work_run+0x13a/0x1a0 kernel/task_work.c:239
 get_signal+0xe78/0x1000 kernel/signal.c:2789
 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]
 __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/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810e3abf48 of 8 bytes by task 20493 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:1752
 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:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x0000000000180051 -> 0x0000000000980111

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 20493 Comm: iou-wrk-20478 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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