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From: Eric Biggers <ebiggers3@gmail.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: syzbot <syzbot+7a1cff37dbbef9e7ba4c@syzkaller.appspotmail.com>,
	akpm@linux-foundation.org, dhowells@redhat.com,
	gs051095@gmail.com, linux-kernel@vger.kernel.org,
	oleg@redhat.com, pasha.tatashin@oracle.com, riel@redhat.com,
	rppt@linux.vnet.ibm.com, syzkaller-bugs@googlegroups.com,
	wangkefeng.wang@huawei.com
Subject: Re: KASAN: use-after-free Read in alloc_pid
Date: Mon, 2 Apr 2018 20:10:21 -0700	[thread overview]
Message-ID: <20180403031021.GB685@sol.localdomain> (raw)
In-Reply-To: <878ta5z00m.fsf@xmission.com>

On Mon, Apr 02, 2018 at 06:00:57PM -0500, Eric W. Biederman wrote:
> syzbot <syzbot+7a1cff37dbbef9e7ba4c@syzkaller.appspotmail.com> writes:
> 
> > Hello,
> >
> > syzbot hit the following crash on upstream commit
> > 9dd2326890d89a5179967c947dab2bab34d7ddee (Fri Mar 30 17:29:47 2018 +0000)
> > Merge tag 'ceph-for-4.16-rc8' of git://github.com/ceph/ceph-client
> > syzbot dashboard link:
> > https://syzkaller.appspot.com/bug?extid=7a1cff37dbbef9e7ba4c
> >
> > So far this crash happened 4 times on upstream.
> >
> > Unfortunately, I don't have any reproducer for this crash yet.
> 
> Do you have any of the other traces?  This looks like a something is
> calling put_pid_ns more than it is calling get_pid_ns causing a
> reference count mismatch.
> 
> If this is not: 9ee332d99e4d5a97548943b81c54668450ce641b
> 
> I could use a few more hints to help narrow down what is going wrong.
> 
> It would be nice to know what the other 3 crashes looked like and
> exactly which upstream they were on.
> 

The other crashes are shown on the syzbot dashboard (link was given in the
original email).

Eric

  reply	other threads:[~2018-04-03  3:09 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-01  8:21 syzbot
2018-04-02 23:00 ` Eric W. Biederman
2018-04-03  3:10   ` Eric Biggers [this message]
2018-04-03 10:45     ` Tetsuo Handa
2018-04-10 14:11 ` syzbot
2018-04-10 14:33   ` Tetsuo Handa
2018-04-21 10:43     ` Tetsuo Handa
2018-04-24 16:33       ` Eric W. Biederman

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