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KCSAN: data-race in p9_poll_workfn / p9_write_work (3)

Status: auto-closed as invalid on 2021/08/25 10:41
Subsystems: v9fs
[Documentation on labels]
First crash: 1694d, last: 1694d
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in p9_poll_workfn / p9_write_work (2) v9fs 6 1 1768d 1768d 0/29 auto-closed as invalid on 2021/06/12 15:05
upstream KCSAN: data-race in p9_poll_workfn / p9_write_work (5) v9fs 6 2 706d 714d 0/29 auto-obsoleted due to no activity on 2024/05/09 10:29
upstream KCSAN: data-race in p9_poll_workfn / p9_write_work (4) v9fs 6 1 1275d 1275d 0/29 auto-obsoleted due to no activity on 2022/10/18 20:14
upstream KCSAN: data-race in p9_poll_workfn / p9_write_work (7) v9fs 6 2 290d 303d 0/29 auto-obsoleted due to no activity on 2025/07/20 09:07
upstream KCSAN: data-race in p9_poll_workfn / p9_write_work (6) v9fs 6 3 644d 661d 0/29 auto-obsoleted due to no activity on 2024/07/10 06:15
upstream KCSAN: data-race in p9_poll_workfn / p9_write_work v9fs 6 43 2286d 2330d 0/29 auto-closed as invalid on 2020/02/15 21:46

Sample crash report:
==================================================================
BUG: KCSAN: data-race in p9_poll_workfn / p9_write_work

write to 0xffff888107699894 of 4 bytes by task 4516 on cpu 0:
 p9_write_work+0x4b1/0x7c0 net/9p/trans_fd.c:496
 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

read to 0xffff888107699894 of 4 bytes by task 718 on cpu 1:
 p9_poll_mux net/9p/trans_fd.c:643 [inline]
 p9_poll_workfn+0x202/0x410 net/9p/trans_fd.c:1145
 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: 0x00000009 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 718 Comm: kworker/1:2 Tainted: G        W         5.14.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_poll_workfn
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/07/21 10:41 upstream 8cae8cd89f05 1b201b48 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in p9_poll_workfn / p9_write_work
* Struck through repros no longer work on HEAD.