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KCSAN: data-race in p9_poll_workfn / p9_write_work (2)

Status: auto-closed as invalid on 2021/06/12 15:05
Subsystems: v9fs
[Documentation on labels]
First crash: 1309d, last: 1309d
Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in p9_poll_workfn / p9_write_work (5) v9fs 2 248d 255d 0/28 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 1 816d 816d 0/28 auto-obsoleted due to no activity on 2022/10/18 20:14
upstream KCSAN: data-race in p9_poll_workfn / p9_write_work (3) v9fs 1 1236d 1236d 0/28 auto-closed as invalid on 2021/08/25 10:41
upstream KCSAN: data-race in p9_poll_workfn / p9_write_work (6) v9fs 3 186d 203d 0/28 auto-obsoleted due to no activity on 2024/07/10 06:15
upstream KCSAN: data-race in p9_poll_workfn / p9_write_work v9fs 43 1827d 1871d 0/28 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 0xffff888143f8a894 of 4 bytes by task 17 on cpu 1:
 p9_write_work+0x4b1/0x7c0 net/9p/trans_fd.c:496
 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2275
 worker_thread+0x636/0xae0 kernel/workqueue.c:2421
 kthread+0x1d0/0x1f0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff888143f8a894 of 4 bytes by task 1011 on cpu 0:
 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:2275
 worker_thread+0x636/0xae0 kernel/workqueue.c:2421
 kthread+0x1d0/0x1f0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1011 Comm: kworker/0:2 Not tainted 5.12.0-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
2021/05/08 15:03 upstream dd860052c99b bc5434be .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.