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KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests

Status: auto-closed as invalid on 2021/06/13 15:29
Subsystems: fs
[Documentation on labels]
First crash: 1710d, last: 1710d
▶ ▼ Similar bugs (11)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests (3) fs 6 2 1535d 1544d 0/29 auto-closed as invalid on 2021/12/05 08:50
upstream KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests (5) fs 6 2 1375d 1380d 0/29 auto-closed as invalid on 2022/05/14 09:20
upstream KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests (10) io-uring 6 1 621d 621d 0/29 auto-obsoleted due to no activity on 2024/06/06 09:26
upstream KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests (12) io-uring 6 4 369d 400d 28/29 fixed on 2025/05/06 15:33
upstream KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests (2) fs 6 1 1643d 1643d 0/29 auto-closed as invalid on 2021/08/20 00:41
upstream KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests (4) fs 6 3 1425d 1454d 0/29 auto-closed as invalid on 2022/03/25 11:59
upstream KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests (9) io-uring 6 2 694d 712d 0/29 auto-obsoleted due to no activity on 2024/03/25 07:41
upstream KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests (8) io-uring 6 1 783d 764d 0/29 auto-obsoleted due to no activity on 2023/12/27 04:40
upstream KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests (11) io-uring 6 1 563d 563d 0/29 auto-obsoleted due to no activity on 2024/08/03 17:56
upstream KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests (7) io-uring 6 1 853d 847d 0/29 auto-obsoleted due to no activity on 2023/10/18 23:09
upstream KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests (6) io-uring 6 2 1249d 1272d 0/29 auto-closed as invalid on 2022/09/17 04:56

Sample crash report:
==================================================================
BUG: KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests

write to 0xffff88811d595338 of 8 bytes by task 32215 on cpu 1:
 io_sq_thread+0xf8d/0x10b0 fs/io_uring.c:6911
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff88811d595338 of 8 bytes by task 113 on cpu 0:
 io_uring_try_cancel_requests+0x2de/0x8e0 fs/io_uring.c:8945
 io_ring_exit_work+0x7c/0x1110 fs/io_uring.c:8735
 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2275
 worker_thread+0x636/0xae0 kernel/workqueue.c:2421
 kthread+0x1d0/0x1f0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 113 Comm: kworker/u4:2 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound io_ring_exit_work
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/05/09 15:27 upstream b741596468b0 bc5434be .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests
* Struck through repros no longer work on HEAD.