KCSAN: data-race in p9_conn_cancel / p9_poll_workfn (3)

Status: auto-obsoleted due to no activity on 2023/10/26 00:39
Subsystems: v9fs
[Documentation on labels]
First crash: 1038d, last: 1038d
▶ ▼ Similar bugs (8)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in p9_conn_cancel / p9_poll_workfn (4) v9fs 6 1 848d 848d 0/29 auto-obsoleted due to no activity on 2024/05/02 19:52
upstream KCSAN: data-race in p9_conn_cancel / p9_poll_workfn (7) v9fs 6 2 678d 692d 0/29 auto-obsoleted due to no activity on 2024/10/19 18:15
upstream KCSAN: data-race in p9_conn_cancel / p9_poll_workfn (2) v9fs 6 1 1096d 1096d 0/29 auto-obsoleted due to no activity on 2023/08/28 09:43
upstream KCSAN: data-race in p9_conn_cancel / p9_poll_workfn (5) v9fs 6 1 812d 812d 0/29 auto-obsoleted due to no activity on 2024/06/08 01:35
upstream KCSAN: data-race in p9_conn_cancel / p9_poll_workfn (6) v9fs 6 1 767d 767d 0/29 auto-obsoleted due to no activity on 2024/07/22 12:28
upstream KCSAN: data-race in p9_conn_cancel / p9_poll_workfn (8) v9fs 6 1 606d 606d 0/29 auto-obsoleted due to no activity on 2025/01/20 09:01
upstream KCSAN: data-race in p9_conn_cancel / p9_poll_workfn v9fs 6 1 1792d 1792d 0/29 auto-closed as invalid on 2021/10/01 19:17
upstream KCSAN: data-race in p9_conn_cancel / p9_poll_workfn (9) v9fs 6 2 494d 532d 28/29 fixed on 2025/06/10 16:19

Sample crash report:
==================================================================
BUG: KCSAN: data-race in p9_conn_cancel / p9_poll_workfn

write to 0xffff888147602828 of 4 bytes by task 21669 on cpu 0:
 p9_conn_cancel+0x89/0x400 net/9p/trans_fd.c:200
 p9_write_work+0x3ac/0x740 net/9p/trans_fd.c:523
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2703
 worker_thread+0x525/0x730 kernel/workqueue.c:2784
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

read to 0xffff888147602828 of 4 bytes by task 21676 on cpu 1:
 p9_poll_mux net/9p/trans_fd.c:626 [inline]
 p9_poll_workfn+0xc0/0x410 net/9p/trans_fd.c:1167
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2703
 worker_thread+0x525/0x730 kernel/workqueue.c:2784
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

value changed: 0x00000000 -> 0xffffffea

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 21676 Comm: kworker/1:11 Not tainted 6.6.0-rc2-syzkaller-00027-g5d2f53532ecc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Workqueue: events p9_poll_workfn
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/09/21 00:32 upstream 5d2f53532ecc 0b6a67ac .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in p9_conn_cancel / p9_poll_workfn
* Struck through repros no longer work on HEAD.