linux-kernel - Re: kernel panic: MAC Initialization failed. (2)

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Message-ID: <CACT4Y+b4dcJzLV+yqKjHgsm89H+hj8wZOSRVkV69Vv=c+YzXxg@mail.gmail.com>
Date:   Thu, 28 Feb 2019 11:18:21 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     syzbot <syzbot+29569ed06425fcf67a95@...kaller.appspotmail.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        James Morris <jmorris@...ei.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-security-module@...r.kernel.org,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Kentaro Takeda <takedakn@...data.co.jp>
Subject: Re: kernel panic: MAC Initialization failed. (2)

On Thu, Feb 28, 2019 at 11:11 AM Tetsuo Handa
<penguin-kernel@...ove.sakura.ne.jp> wrote:
>
> On 2019/02/28 15:42, syzbot wrote:
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    7b827ff9af88 Add linux-next specific files for 20190227
> > git tree:       linux-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=10f71894c00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=5fa6b8975759dcc5
> > dashboard link: https://syzkaller.appspot.com/bug?extid=29569ed06425fcf67a95
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=113a8242c00000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=154d6bd0c00000
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+29569ed06425fcf67a95@...kaller.appspotmail.com
> >
>
> Memory allocation failure due to fault injection before loading policy.
>
> #syz dup: kernel panic: MAC Initialization failed.

How/why is not this "user crashes system"? Kernel must not panic on
OOM. There is memcg as well.