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KCSAN: data-race in p9_conn_cancel / p9_poll_workfn (5)

Status: auto-obsoleted due to no activity on 2024/06/08 01:35
Subsystems: v9fs
[Documentation on labels]
Reported-by: syzbot+92243d89630278dc1183@syzkaller.appspotmail.com
First crash: 49d, last: 49d
Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in p9_conn_cancel / p9_poll_workfn (4) v9fs 1 85d 85d 0/27 auto-obsoleted due to no activity on 2024/05/02 19:52
upstream KCSAN: data-race in p9_conn_cancel / p9_poll_workfn (2) v9fs 1 334d 334d 0/27 auto-obsoleted due to no activity on 2023/08/28 09:43
upstream KCSAN: data-race in p9_conn_cancel / p9_poll_workfn (6) v9fs 1 4d21h 4d21h 0/27 moderation: reported on 2024/06/17 12:28
upstream KCSAN: data-race in p9_conn_cancel / p9_poll_workfn (3) v9fs 1 275d 275d 0/27 auto-obsoleted due to no activity on 2023/10/26 00:39
upstream KCSAN: data-race in p9_conn_cancel / p9_poll_workfn v9fs 1 1029d 1029d 0/27 auto-closed as invalid on 2021/10/01 19:17

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

write to 0xffff888132658c28 of 4 bytes by task 10836 on cpu 0:
 p9_conn_cancel+0x89/0x400 net/9p/trans_fd.c:199
 p9_write_work+0x3ac/0x750 net/9p/trans_fd.c:522
 process_one_work kernel/workqueue.c:3267 [inline]
 process_scheduled_works+0x465/0x990 kernel/workqueue.c:3348
 worker_thread+0x526/0x730 kernel/workqueue.c:3429
 kthread+0x1d1/0x210 kernel/kthread.c:388
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffff888132658c28 of 4 bytes by task 21991 on cpu 1:
 p9_poll_mux net/9p/trans_fd.c:625 [inline]
 p9_poll_workfn+0xc0/0x420 net/9p/trans_fd.c:1177
 process_one_work kernel/workqueue.c:3267 [inline]
 process_scheduled_works+0x465/0x990 kernel/workqueue.c:3348
 worker_thread+0x526/0x730 kernel/workqueue.c:3429
 kthread+0x1d1/0x210 kernel/kthread.c:388
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x00000000 -> 0xffffffea

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 21991 Comm: kworker/1:3 Not tainted 6.9.0-rc6-syzkaller-00232-gddb4c3f25b7b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: events p9_poll_workfn
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/04 01:35 upstream ddb4c3f25b7b 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in p9_conn_cancel / p9_poll_workfn
* Struck through repros no longer work on HEAD.