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Date:   Thu, 3 Jan 2019 13:39:02 -0600
From:   Willem de Bruijn <>
To:     syzbot <>
Cc:     David Miller <>,
        Alexey Kuznetsov <>,
        linux-kernel <>,
        Network Development <>,,
        Hideaki YOSHIFUJI <>,
Subject: Re: kernel panic: stack is corrupted in udp4_lib_lookup2

On Thu, Jan 3, 2019 at 7:07 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:
> kernel config:
> dashboard link:
> 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:
> 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:

This sounds similar to the stack corruption fixed recently in commit
e7cc082455cb ("udp: Support for error handlers of tunnels ...").

That fix is for ipv4 gue_err(). ipv6 gue6_err() probably needs the same.

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