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Subject: [syzbot] [io-uring?] KCSAN: data-race in io_req_task_cancel / io_wq_free_work
From: syzbot <syzbot+903a2ad71fb3f1e47cf5@syzkaller.appspotmail.com>
To: asml.silence@gmail.com, axboe@kernel.dk, io-uring@vger.kernel.org,
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Content-Type: text/plain; charset="UTF-8"
Hello,
syzbot found the following issue on:
HEAD commit: 92b71befc349 Merge tag 'objtool-urgent-2025-04-01' of git:..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11195404580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a8120cade23cf14e
dashboard link: https://syzkaller.appspot.com/bug?extid=903a2ad71fb3f1e47cf5
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2e7df7bc2f52/disk-92b71bef.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/be59123d5efb/vmlinux-92b71bef.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7c9eff86053e/bzImage-92b71bef.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+903a2ad71fb3f1e47cf5@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in io_req_task_cancel / io_wq_free_work
write to 0xffff888117207448 of 8 bytes by task 3861 on cpu 1:
req_set_fail io_uring/io_uring.h:-1 [inline]
io_req_defer_failed io_uring/io_uring.c:927 [inline]
io_req_task_cancel+0x7c/0x1a0 io_uring/io_uring.c:1360
io_handle_tw_list+0x194/0x1d0 io_uring/io_uring.c:1057
tctx_task_work_run+0x6e/0x1c0 io_uring/io_uring.c:1121
tctx_task_work+0x44/0x80 io_uring/io_uring.c:1139
task_work_run+0x13c/0x1b0 kernel/task_work.c:227
get_signal+0xee2/0x1080 kernel/signal.c:2809
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 0xffff888117207448 of 8 bytes by task 3871 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:1799
io_worker_handle_work+0x4c9/0x9f0 io_uring/io-wq.c:618
io_wq_worker+0x277/0x850 io_uring/io-wq.c:669
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: 0x0000000000180051 -> 0x0000000000980111
Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3871 Comm: iou-wrk-3861 Not tainted 6.14.0-syzkaller-12508-g92b71befc349 #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================
---
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