linux-kernel - Re: general protection fault in dst_dev

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Message-ID: <CACT4Y+Zrr6AHWh6+ULMoY_Vrpkb0yAjO0nBd-C-=iiYsSWwVEg@mail.gmail.com>
Date:   Wed, 20 Mar 2019 17:36:11 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Jon Maloy <jon.maloy@...csson.com>
Cc:     syzbot <syzbot+9d4c12bfd45a58738d0a@...kaller.appspotmail.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "dsahern@...il.com" <dsahern@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "pablo@...filter.org" <pablo@...filter.org>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>,
        "tipc-discussion@...ts.sourceforge.net" 
        <tipc-discussion@...ts.sourceforge.net>,
        "ying.xue@...driver.com" <ying.xue@...driver.com>
Subject: Re: general protection fault in dst_dev_put (2)

On Wed, Mar 20, 2019 at 4:43 PM Jon Maloy <jon.maloy@...csson.com> wrote:
>
> This one points to a bug that was fixed in commit dc4501ff2875 ("tipc: fix a double free in tipc_enable_bearer()").
> That commit was applied to 4.20, but is not present in 4.16, which caused this dump.
> To get further with this I need a dump of the actual crash in 4.20 or 5.0.
> Maybe we are looking at two different problems here?

Hi Jon,

The latest crashes are available on the syzbot dashboard (see dashbolard link).

>
> ///jon
>
>
>
> > -----Original Message-----
> > From: netdev-owner@...r.kernel.org <netdev-owner@...r.kernel.org>
> > On Behalf Of syzbot
> > Sent: 19-Mar-19 18:24
> > To: davem@...emloft.net; dsahern@...il.com; Jon Maloy
> > <jon.maloy@...csson.com>; linux-kernel@...r.kernel.org;
> > netdev@...r.kernel.org; pablo@...filter.org; syzkaller-
> > bugs@...glegroups.com; tipc-discussion@...ts.sourceforge.net;
> > ying.xue@...driver.com
> > Subject: Re: general protection fault in dst_dev_put (2)
> >
> > syzbot has bisected this bug to:
> >
> > commit 52dfae5c85a4c1078e9f1d5e8947d4a25f73dd81
> > Author: Jon Maloy <jon.maloy@...csson.com>
> > Date:   Thu Mar 22 19:42:52 2018 +0000
> >
> >      tipc: obtain node identity from interface by default
> >
> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1631fc2b200000
> > start commit:   52dfae5c tipc: obtain node identity from interface by defa..
> > git tree:       upstream
> > final crash:    https://syzkaller.appspot.com/x/report.txt?x=1531fc2b200000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=1131fc2b200000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=8f00801d7b7c4fe6
> > dashboard link:
> > https://syzkaller.appspot.com/bug?extid=9d4c12bfd45a58738d0a
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17254878c00000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=171ca5df400000
> >
> > Reported-by: syzbot+9d4c12bfd45a58738d0a@...kaller.appspotmail.com
> > Fixes: 52dfae5c ("tipc: obtain node identity from interface by default")
>
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