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Date: Thu, 3 Jan 2019 21:07:43 +0100 From: Stefano Brivio <sbrivio@...hat.com> To: Eric Dumazet <eric.dumazet@...il.com> Cc: syzbot <syzbot+4ad25edc7a33e4ab91e0@...kaller.appspotmail.com>, davem@...emloft.net, kuznet@....inr.ac.ru, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com, yoshfuji@...ux-ipv6.org, Willem de Bruijn <willemb@...gle.com> Subject: Re: kernel panic: stack is corrupted in udp4_lib_lookup2 On Thu, 3 Jan 2019 12:01:29 -0800 Eric Dumazet <eric.dumazet@...il.com> wrote: > On 01/03/2019 05:07 AM, syzbot wrote: > > Hello, > > > > syzbot found the following crash on: > > > > HEAD commit: 195303136f19 Merge tag 'kconfig-v4.21-2' of git://git.kern.. > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=12245d8f400000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=5e7dc790609552d7 > > dashboard link: https://syzkaller.appspot.com/bug?extid=4ad25edc7a33e4ab91e0 > > 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+4ad25edc7a33e4ab91e0@...kaller.appspotmail.com > > > > protocol 88fb is buggy, dev hsr_slave_1 > > protocol 88fb is buggy, dev hsr_slave_0 > > protocol 88fb is buggy, dev hsr_slave_1 > > FAT-fs (loop0): invalid media value (0x00) > > FAT-fs (loop0): Can't find a valid FAT filesystem > > Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: udp4_lib_lookup2+0x7ea/0x7f0 net/ipv4/udp.c:455 > > CPU: 1 PID: 17960 Comm: syz-executor2 Not tainted 4.20.0+ #176 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > > Call Trace: > > Kernel Offset: disabled > > Rebooting in 86400 seconds.. > > > > > > --- > > This bug is generated by a bot. It may contain errors. > > See https://goo.gl/tpsmEJ for more information about syzbot. > > syzbot engineers can be reached at syzkaller@...glegroups.com. > > > > syzbot will keep track of this bug report. See: > > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. > > Maybe commit 11789039da536fea96c98a40c2b441decf2e7323 > Author: Stefano Brivio <sbrivio@...hat.com> > Date: Tue Dec 18 00:13:17 2018 +0100 > > fou: Prevent unbounded recursion in GUE error handler > > Forgot to deal with IPv6 ? Damn, yes. :( Thanks both for pointing that out, patch coming. Still, I can't be sure this is the same issue. -- Stefano
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