linux-kernel - Re: [syzbot] [rcu?] WARNING in rcu_note_context

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Message-ID: <Zp6dFQc6yyL3bqRa@boqun-archlinux>
Date: Mon, 22 Jul 2024 10:55:33 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: Z qiang <qiang.zhang1211@...il.com>
Cc: paulmck@...nel.org,
	syzbot <syzbot+784d0a1246a539975f05@...kaller.appspotmail.com>,
	frederic@...nel.org, jiangshanlai@...il.com, joel@...lfernandes.org,
	josh@...htriplett.org, linux-kernel@...r.kernel.org,
	mathieu.desnoyers@...icios.com, neeraj.upadhyay@...nel.org,
	rcu@...r.kernel.org, rostedt@...dmis.org,
	syzkaller-bugs@...glegroups.com, urezki@...il.com
Subject: Re: [syzbot] [rcu?] WARNING in rcu_note_context_switch (2)

On Mon, Jul 22, 2024 at 02:42:10PM +0800, Z qiang wrote:
[...]
> > >
> > > This should be caused by this modification  (commit id:
> > > ca567df74a28a9fb368c6b2d93e864113f73f5c2)
> > > when tsk is null, miss invoke rcu_read_unlock() for NS_GET_TGID_IN_PIDNS.
> >
> > Very good, and it looks like that to me as well.  Would you like to
> > submit a fix patch and see if syzbot agrees?
> 
> I see there is a c test
> program(https://syzkaller.appspot.com/x/repro.c?x=17a3c349980000),
> I will run this test on my local machine, and then make a fix.
> 

FWIW, syzbot provides a way to do tests automatically:

	https://github.com/google/syzkaller/blob/master/docs/syzbot.md#testing-patches

But looks like Christian already fixed this:

	https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=280e36f0d5b997173d014c07484c03a7f7750668

Regards,
Boqun

> Thanks
> Zqiang
> 
> 
[...]