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KCSAN: data-race in p9_conn_cancel / p9_write_work (2)

Status: auto-closed as invalid on 2021/03/08 14:39
Subsystems: v9fs
[Documentation on labels]
First crash: 1190d, last: 1178d
▶ ▼ Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in p9_conn_cancel / p9_write_work (5) v9fs 1 18d 18d 0/26 moderation: reported on 2024/04/07 07:31
upstream KCSAN: data-race in p9_conn_cancel / p9_write_work (4) v9fs 2 149d 172d 0/26 auto-obsoleted due to no activity on 2024/01/02 07:46
upstream KCSAN: data-race in p9_conn_cancel / p9_write_work v9fs 1 1247d 1231d 0/26 auto-closed as invalid on 2020/12/30 07:04
upstream KCSAN: data-race in p9_conn_cancel / p9_write_work (3) v9fs 1 736d 736d 0/26 auto-closed as invalid on 2022/05/24 19:24

Sample crash report:
==================================================================
BUG: KCSAN: data-race in p9_conn_cancel / p9_write_work

write to 0xffff888025096e28 of 4 bytes by task 16252 on cpu 0:
 p9_conn_cancel+0x88/0x400 net/9p/trans_fd.c:201
 p9_poll_mux net/9p/trans_fd.c:628 [inline]
 p9_poll_workfn+0x14c/0x410 net/9p/trans_fd.c:1145
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 kernel/workqueue.c:2421
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff888025096e28 of 4 bytes by task 3858 on cpu 1:
 p9_write_work+0x23/0x770 net/9p/trans_fd.c:451
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 kernel/workqueue.c:2421
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3858 Comm: kworker/1:2 Not tainted 5.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_write_work
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/02/01 14:36 upstream 1048ba83fb1c e6b95f32 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in p9_conn_cancel / p9_write_work
2021/01/20 13:33 upstream 45dfb8a5659a d4f4eca5 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in p9_conn_cancel / p9_write_work
* Struck through repros no longer work on HEAD.