linux-kernel - Re: KCSAN: data-race in taskstats_exit / taskstats

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Message-ID: <20191005112957.n2fuhhmqdgrctcxj@wittgenstein>
Date:   Sat, 5 Oct 2019 13:29:58 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+c5d03165a1bd1dead0c1@...kaller.appspotmail.com>,
        bsingharora@...il.com, Marco Elver <elver@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: KCSAN: data-race in taskstats_exit / taskstats_exit

On Sat, Oct 05, 2019 at 06:29:39AM +0200, Dmitry Vyukov wrote:
> On Sat, Oct 5, 2019 at 6:26 AM syzbot
> <syzbot+c5d03165a1bd1dead0c1@...kaller.appspotmail.com> wrote:
> >
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    b4bd9343 x86, kcsan: Enable KCSAN for x86
> > git tree:       https://github.com/google/ktsan.git kcsan
> > console output: https://syzkaller.appspot.com/x/log.txt?x=125329db600000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=c0906aa620713d80
> > dashboard link: https://syzkaller.appspot.com/bug?extid=c5d03165a1bd1dead0c1
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> >
> > Unfortunately, I don't have any reproducer for this crash yet.
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+c5d03165a1bd1dead0c1@...kaller.appspotmail.com
> 
> +Christian, you wanted races in process mgmt ;)

Yes, indeed. :) Sent a fix for this one just now. I'll put it in my
fixes tree for rc3.

Christian