netdev - Re: general protection fault in fib6_purge

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Message-ID: <CACT4Y+anbSEh89LaFeT2Bi4qVM1Maf_0x11ynrfCk9PNvg9UXw@mail.gmail.com>
Date:   Wed, 20 Mar 2019 17:41:01 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Jon Maloy <jon.maloy@...csson.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

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


> ///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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