linux-kernel - Re: WARNING in proc

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Message-ID: <20180205194101.GB7593@avx2>
Date:   Mon, 5 Feb 2018 22:41:01 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     syzbot <syzbot+75334212ef69a07c3209@...kaller.appspotmail.com>,
        dvyukov@...gle.com
Cc:     akpm@...ux-foundation.org, dave@...olabs.net, dhowells@...hat.com,
        geliangtang@...il.com, hkallweit1@...il.com,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        tiwai@...e.de, viro@...iv.linux.org.uk
Subject: Re: WARNING in proc_register

On Mon, Feb 05, 2018 at 09:58:01AM -0800, syzbot wrote:
> proc_dir_entry 'ipt_CLUSTERIP/172.20.0.170' already registered
> WARNING: CPU: 1 PID: 4074 at fs/proc/generic.c:330  

>   proc_create_data+0xf8/0x180 fs/proc/generic.c:494
>   clusterip_config_init net/ipv4/netfilter/ipt_CLUSTERIP.c:250 [inline]

Dima, this warning is never about /proc but always about some other code
registering duplicate /proc entry.

I don't know how easily scriptable is mail sender but you want to look at
the second line in the backtrace.