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Date: Thu, 3 Jan 2019 12:01:29 -0800 From: Eric Dumazet <eric.dumazet@...il.com> To: 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, Stefano Brivio <sbrivio@...hat.com> Cc: Willem de Bruijn <willemb@...gle.com> Subject: Re: kernel panic: stack is corrupted in udp4_lib_lookup2 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 ?
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