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KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests (2)

Status: auto-closed as invalid on 2021/08/20 00:41
Subsystems: fs
[Documentation on labels]
First crash: 1732d, last: 1732d
▶ ▼ 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 1625d 1633d 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 1465d 1469d 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 711d 711d 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 459d 490d 28/29 fixed on 2025/05/06 15:33
upstream KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests (4) fs 6 3 1515d 1544d 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 fs 6 1 1800d 1800d 0/29 auto-closed as invalid on 2021/06/13 15:29
upstream KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests (9) io-uring 6 2 784d 802d 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 873d 853d 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 653d 653d 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 942d 937d 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 1339d 1362d 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 0xffff88810991b278 of 8 bytes by task 933 on cpu 1:
 io_sq_thread+0xaab/0xba0 fs/io_uring.c:6915
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

read to 0xffff88810991b278 of 8 bytes by task 29805 on cpu 0:
 io_uring_try_cancel_requests+0x306/0x880 fs/io_uring.c:8973
 io_ring_exit_work+0x7f/0x1350 fs/io_uring.c:8764
 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276
 worker_thread+0x636/0xae0 kernel/workqueue.c:2422
 kthread+0x262/0x280 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

value changed: 0xffff888108b30000 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 29805 Comm: kworker/u4:8 Tainted: G        W         5.14.0-rc1-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
2021/07/16 00:39 upstream dd9c7df94c1b f115ae98 .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.