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KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests (4)

Status: auto-closed as invalid on 2022/03/25 11:59
Subsystems: fs
[Documentation on labels]
First crash: 827d, last: 798d
Similar bugs (8)
Kernel Title 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 2 908d 917d 0/26 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 2 748d 753d 0/26 auto-closed as invalid on 2022/05/14 09:20
upstream KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests (2) fs 1 1016d 1016d 0/26 auto-closed as invalid on 2021/08/20 00:41
upstream KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests fs 1 1083d 1083d 0/26 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 2 67d 86d 0/26 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 1 156d 137d 0/26 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 (7) io-uring 1 226d 220d 0/26 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 2 622d 645d 0/26 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 0xffff88811867eab8 of 8 bytes by task 4468 on cpu 1:
 io_sq_thread+0xb19/0xc00 fs/io_uring.c:7635
 ret_from_fork+0x1f/0x30

read to 0xffff88811867eab8 of 8 bytes by task 1824 on cpu 0:
 io_uring_try_cancel_requests+0x1ab/0x308 fs/io_uring.c:9775
 io_ring_exit_work+0x79/0x3c7 fs/io_uring.c:9571
 process_one_work+0x3f6/0x960 kernel/workqueue.c:2307
 worker_thread+0x616/0xa70 kernel/workqueue.c:2454
 kthread+0x1bf/0x1e0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30

value changed: 0xffff888117fce700 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1824 Comm: kworker/u4:3 Not tainted 5.17.0-rc4-syzkaller-00069-ga3580ac9b7a3-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound io_ring_exit_work
==================================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/02/18 11:53 upstream a3580ac9b7a3 3cd800e4 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests
2022/02/14 03:39 upstream 42964a18f81c 8b9ca619 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests
2022/01/20 10:01 upstream 1d1df41c5a33 5da9499f .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.