linux-kernel - RE: general protection fault in fib6_purge

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Date:   Wed, 20 Mar 2019 16:53:07 +0000
From:   Jon Maloy <jon.maloy@...csson.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
CC:     syzbot <syzbot+a25307ad099309f1c2b9@...kaller.appspotmail.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuznet@....inr.ac.ru" <kuznet@....inr.ac.ru>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.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>,
        "yoshfuji@...ux-ipv6.org" <yoshfuji@...ux-ipv6.org>
Subject: RE: general protection fault in fib6_purge_rt



> -----Original Message-----
> From: Dmitry Vyukov <dvyukov@...gle.com>
> Sent: 20-Mar-19 17:41
> To: Jon Maloy <jon.maloy@...csson.com>
> Cc: syzbot <syzbot+a25307ad099309f1c2b9@...kaller.appspotmail.com>;
> davem@...emloft.net; kuznet@....inr.ac.ru; linux-
> kernel@...r.kernel.org; netdev@...r.kernel.org; syzkaller-
> bugs@...glegroups.com; tipc-discussion@...ts.sourceforge.net;
> ying.xue@...driver.com; yoshfuji@...ux-ipv6.org
> Subject: Re: general protection fault in fib6_purge_rt
> 
> On Wed, Mar 20, 2019 at 4:59 PM Jon Maloy <jon.maloy@...csson.com>
> wrote:
> >
> > This one identifies the same culprit as
> syzbot+9d4c12bfd45a58738d0a@...kaller.appspotmail.com, but points to a
> different bug.
> > That bug has also been fixed, in commit adba75be0d23  ("tipc: fix lockdep
> warning when reinitilaizing sockets"), applied in 4.20 but not present in 4.16, -
> the source of the dump.
> > Once again, a dump from 4.20/5.0 might be a help.
> 
> 
> Looking at the bisection log maybe this reproducer triggers multiple kernel
> bugs.

I think so. 

> All crashes including the latest ones and other info are always available on
> the dashboard.

Looking at the latest dashboard reports, I don't see anything that points to TIPC. 

///jon


> 
> 
> > ///jon
> >
> >
> > > -----Original Message-----
> > > From: syzbot
> <syzbot+a25307ad099309f1c2b9@...kaller.appspotmail.com>
> > > Sent: 18-Mar-19 08:28
> > > To: davem@...emloft.net; Jon Maloy <jon.maloy@...csson.com>;
> > > kuznet@....inr.ac.ru; linux-kernel@...r.kernel.org;
> > > netdev@...r.kernel.org; syzkaller-bugs@...glegroups.com; tipc-
> > > discussion@...ts.sourceforge.net; ying.xue@...driver.com;
> > > yoshfuji@...ux- ipv6.org
> > > Subject: Re: general protection fault in fib6_purge_rt
> > >
> > > 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=1116d2a3200000
> > > start commit:   52dfae5c tipc: obtain node identity from interface by
> defa..
> > > git tree:       linux-next
> > > final crash:
> https://syzkaller.appspot.com/x/report.txt?x=1316d2a3200000
> > > console output:
> > > https://syzkaller.appspot.com/x/log.txt?x=1516d2a3200000
> > > kernel config:
> > > https://syzkaller.appspot.com/x/.config?x=c8b6073d992e8217
> > > dashboard link:
> > > https://syzkaller.appspot.com/bug?extid=a25307ad099309f1c2b9
> > > syz repro:
> https://syzkaller.appspot.com/x/repro.syz?x=16b2c56f200000
> > > C reproducer:
> https://syzkaller.appspot.com/x/repro.c?x=13b8890b200000
> > >
> > > Reported-by: syzbot+a25307ad099309f1c2b9@...kaller.appspotmail.com
> > > Fixes: 52dfae5c ("tipc: obtain node identity from interface by
> > > default")
> >
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