linux-kernel - RE: kernel panic: corrupted stack end in corrupted

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Date:   Thu, 20 Jun 2019 14:53:46 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     syzbot <syzbot+b764c7ca388222ddfb17@...kaller.appspotmail.com>,
        ast@...nel.org, daniel@...earbox.net, john.fastabend@...il.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: RE: kernel panic: corrupted stack end in corrupted

syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    29f785ff Merge branch 'fixes' of git://git.kernel.org/pub/..
> git tree:       net
> console output: https://syzkaller.appspot.com/x/log.txt?x=1158d411a00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=e5c77f8090a3b96b
> dashboard link: https://syzkaller.appspot.com/bug?extid=b764c7ca388222ddfb17
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=100ca932a00000
> 
> The bug was bisected to:
> 
> commit e9db4ef6bf4ca9894bb324c76e01b8f1a16b2650
> Author: John Fastabend <john.fastabend@...il.com>
> Date:   Sat Jun 30 13:17:47 2018 +0000
> 
>      bpf: sockhash fix omitted bucket lock in sock_close
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=135e8a3aa00000
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=10de8a3aa00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=175e8a3aa00000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+b764c7ca388222ddfb17@...kaller.appspotmail.com
> Fixes: e9db4ef6bf4c ("bpf: sockhash fix omitted bucket lock in sock_close")
> 
> Kernel panic - not syncing: corrupted stack end detected inside scheduler
> CPU: 0 PID: 8770 Comm: syz-executor.4 Not tainted 5.2.0-rc5+ #57
> Hardware name: Google GooglSeaBIOS (version 1.8.2-20190503_170316-google)
> 

I believe this is the same or similar bug to the others found with
sockmap + ulp running. Will have fixes shortly.

Thanks,
John