linux-kernel - Re: [syzbot] WARNING in exit_tasks_rcu

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Message-ID: <202206131639.DBA0A8D@keescook>
Date:   Mon, 13 Jun 2022 16:42:07 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     "Zhang, Qiang1" <qiang1.zhang@...el.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        syzbot <syzbot+9bb26e7c5e8e4fa7e641@...kaller.appspotmail.com>,
        "brauner@...nel.org" <brauner@...nel.org>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>
Subject: Re: [syzbot] WARNING in exit_tasks_rcu_finish

On Mon, Jun 13, 2022 at 10:36:07AM -0700, syzbot wrote:
> Hello,
> 
> syzbot has tested the proposed patch and the reproducer did not trigger any issue:
> 
> Reported-and-tested-by: syzbot+9bb26e7c5e8e4fa7e641@...kaller.appspotmail.com

Looks like the patch solved the reproducer. :)

> Tested on:
> 
> commit:         6d0c8068 Add linux-next specific files for 20220610
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git next-20220610
> console output: https://syzkaller.appspot.com/x/log.txt?x=12d068eff00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a30d6e3e814e5931
> dashboard link: https://syzkaller.appspot.com/bug?extid=9bb26e7c5e8e4fa7e641
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> patch:          https://syzkaller.appspot.com/x/patch.diff?x=147f47c8080000
> 
> Note: testing is done by a robot and is best-effort only.

You can see the dashboard link above for testing details...

-- 
Kees Cook