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From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: syzbot <syzbot+2c73319c406f1987d156@syzkaller.appspotmail.com>,
	Alexei Starovoitov <ast@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	mcgrof@kernel.org,
	syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
	Daniel Borkmann <daniel@iogearbox.net>
Subject: Re: bpf-next boot error: KASAN: use-after-free Write in call_usermodehelper_exec_work
Date: Thu, 7 Jun 2018 09:07:01 -0700	[thread overview]
Message-ID: <20180607160659.g3x2pwdbxcsx5yxs@ast-mbp.dhcp.thefacebook.com> (raw)
In-Reply-To: <CACT4Y+ZO9pbQ+5gyZPW4DZFKtJbciwmx=gWGxzx2sp2fy8+d6Q@mail.gmail.com>

On Thu, Jun 07, 2018 at 02:19:16PM +0200, Dmitry Vyukov wrote:
> On Mon, Jun 4, 2018 at 10:21 PM, syzbot
> <syzbot+2c73319c406f1987d156@syzkaller.appspotmail.com> wrote:
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    69b450789136 Merge branch 'misc-BPF-improvements'
> > git tree:       bpf-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=1080d1d7800000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=e4078980b886800c
> > dashboard link: https://syzkaller.appspot.com/bug?extid=2c73319c406f1987d156
> > compiler:       gcc (GCC) 8.0.1 20180413 (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+2c73319c406f1987d156@syzkaller.appspotmail.com
> 
> 
> This crash now happens on every other boot of mainline tree. This
> prevents syzbot testing of new code, and just boots machine with
> corrupted memory. Were there any recent changes in umh? +Alexei, you
> seem to touch it last. Could your change cause this?

looking into it. I think I see the issue. Trying to reproduce.

  reply	other threads:[~2018-06-07 16:07 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-04 20:21 syzbot
2018-06-07 12:19 ` Dmitry Vyukov
2018-06-07 16:07   ` Alexei Starovoitov [this message]
2018-06-07 18:12     ` Luis R. Rodriguez
2018-06-07 18:32       ` Dmitry Vyukov

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