linux-kernel - Re: KASAN: null-ptr-deref Read in css_task_iter

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Message-ID: <20190610181901.GC3341036@devbig004.ftw2.facebook.com>
Date:   Mon, 10 Jun 2019 11:19:01 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Hillf Danton <hdanton@...a.com>
Cc:     syzbot <syzbot+d4bba5ccd4f9a2a68681@...kaller.appspotmail.com>,
        ast@...nel.org, bpf@...r.kernel.org, cgroups@...r.kernel.org,
        daniel@...earbox.net, hannes@...xchg.org, kafai@...com,
        linux-kernel@...r.kernel.org, lizefan@...wei.com,
        netdev@...r.kernel.org, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, yhs@...com
Subject: Re: KASAN: null-ptr-deref Read in css_task_iter_advance

Hello, Hillf.

On Tue, Jun 11, 2019 at 12:59:23AM +0800, Hillf Danton wrote:
> >syzbot will keep track of this bug report. See:
> >https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> >
> Ignore my noise if you have no interest seeing the syzbot report.

They're awesome.

> The following tiny diff, made in the hope that it may help you perhaps
> reproduce the crash, waits css lock holders and then pick task off
> the list of dying tasks.

I already posted a fix.  Well, at least I think it's the fix.

  https://www.spinics.net/lists/cgroups/msg22468.html

Thanks.

-- 
tejun