[syzbot] Monthly net report (Nov 2023)

[syzbot]

Hello net maintainers/developers,

This is a 31-day syzbot report for the net subsystem.
All related reports/information can be found at:
https://syzkaller.appspot.com/upstream/s/net

During the period, 5 new issues were detected and 13 were fixed.
In total, 77 issues are still open and 1358 have been fixed so far.

Some of the still happening issues:

Ref Crashes Repro Title
<1> 3878 Yes KMSAN: uninit-value in eth_type_trans (2)
https://syzkaller.appspot.com/bug?extid=0901d0cc75c3d716a3a3
<2> 892 Yes possible deadlock in __dev_queue_xmit (3)
https://syzkaller.appspot.com/bug?extid=3b165dac15094065651e
<3> 860 Yes INFO: task hung in switchdev_deferred_process_work (2)
https://syzkaller.appspot.com/bug?extid=8ecc009e206a956ab317
<4> 590 Yes INFO: task hung in rtnetlink_rcv_msg
https://syzkaller.appspot.com/bug?extid=8218a8a0ff60c19b8eae
<5> 390 Yes WARNING in kcm_write_msgs
https://syzkaller.appspot.com/bug?extid=52624bdfbf2746d37d70
<6> 373 Yes INFO: rcu detected stall in corrupted (4)
https://syzkaller.appspot.com/bug?extid=aa7d098bd6fa788fae8e
<7> 249 Yes INFO: rcu detected stall in tc_modify_qdisc
https://syzkaller.appspot.com/bug?extid=9f78d5c664a8c33f4cce
<8> 240 Yes BUG: corrupted list in p9_fd_cancelled (2)
https://syzkaller.appspot.com/bug?extid=1d26c4ed77bc6c5ed5e6
<9> 172 No INFO: task hung in linkwatch_event (3)
https://syzkaller.appspot.com/bug?extid=d4b2f8282f84f54e87a1
<10> 154 Yes WARNING in print_bfs_bug (2)
https://syzkaller.appspot.com/bug?extid=630f83b42d801d922b8b

---
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[Jamal Hadi Salim]

On Thu, Nov 23, 2023 at 8:12 AM syzbot
<syzbot+listaba4...@syzkaller.appspotmail.com> wrote:
>
> Hello net maintainers/developers,
>
> This is a 31-day syzbot report for the net subsystem.
> All related reports/information can be found at:
> https://syzkaller.appspot.com/upstream/s/net
>

Hi,
Could you please Cc the stakeholders for each issue (especially when
there is a reproducer)? Not everybody reads every single message that
shows up in the kernel.

cheers,
jamal

[Jakub Kicinski]

On Thu, 23 Nov 2023 05:12:23 -0800 syzbot wrote:
> <8> 240 Yes BUG: corrupted list in p9_fd_cancelled (2)
> https://syzkaller.appspot.com/bug?extid=1d26c4ed77bc6c5ed5e6

One nit - p9 is not really net.

Thanks again for restarting the reports!

[Aleksandr Nogikh]

On Sat, Nov 25, 2023 at 3:28 AM Jakub Kicinski <ku...@kernel.org> wrote:
>
> On Thu, 23 Nov 2023 05:12:23 -0800 syzbot wrote:
> > <8> 240 Yes BUG: corrupted list in p9_fd_cancelled (2)
> > https://syzkaller.appspot.com/bug?extid=1d26c4ed77bc6c5ed5e6
>
> One nit - p9 is not really net.

At least it's not reflected in MAINTAINERS:

$ ./scripts/get_maintainer.pl --nom --nor ./net/9p/
v9...@lists.linux.dev (open list:9P FILE SYSTEM)
net...@vger.kernel.org (open list:NETWORKING [GENERAL])
linux-...@vger.kernel.org (open list)

Maybe it could be worth it to add "X: net/9p/" to "NETWORKING [GENERAL]"?
Syzbot would then eventually also pick up the change.

--
Aleksandr

[Jakub Kicinski]

On Tue, 28 Nov 2023 15:54:00 +0100 Aleksandr Nogikh wrote:
> Maybe it could be worth it to add "X: net/9p/" to "NETWORKING [GENERAL]"?
> Syzbot would then eventually also pick up the change.

Good point, sent.

[Aleksandr Nogikh]

Hi Jamal,

This sounds interesting, thanks for the suggestion!

It would be a lot of emails though, so maybe we could randomly pick a
few of them each time.
I've filed https://github.com/google/syzkaller/issues/4369

--
Aleksandr

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