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Date:   Mon, 10 Oct 2016 17:54:08 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     David Miller <davem@...emloft.net>
Cc:     Aaron Conole <aconole@...hat.com>, Florian Westphal <fw@...len.de>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jens Axboe <axboe@...com>, "Theodore Ts'o" <tytso@....edu>,
        Christoph Lameter <cl@...ux.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        NetFilter <netfilter-devel@...r.kernel.org>
Subject: Re: slab corruption with current -git

On Mon, Oct 10, 2016 at 5:30 PM, David Miller <davem@...emloft.net> wrote:
>
> Linus can you add some extra info to that:

Sure. I made it a WARN_ON_ONCE(), but then always just printed the
pf/hooknum. It's all over the map:

 reg->pf=2 and reg->hooknum=4
 reg->pf=2 and reg->hooknum=2
 reg->pf=2 and reg->hooknum=3
 reg->pf=10 and reg->hooknum=4
 reg->pf=10 and reg->hooknum=2
 reg->pf=10 and reg->hooknum=3
 reg->pf=7 and reg->hooknum=1
 reg->pf=7 and reg->hooknum=2
 reg->pf=7 and reg->hooknum=3
 reg->pf=2 and reg->hooknum=0
 reg->pf=2 and reg->hooknum=3
 reg->pf=2 and reg->hooknum=0
 reg->pf=2 and reg->hooknum=3
 reg->pf=2 and reg->hooknum=4
 reg->pf=2 and reg->hooknum=4
 reg->pf=2 and reg->hooknum=1
 reg->pf=2 and reg->hooknum=1
 reg->pf=10 and reg->hooknum=0
 reg->pf=10 and reg->hooknum=3
 reg->pf=10 and reg->hooknum=0
 reg->pf=10 and reg->hooknum=3
 reg->pf=10 and reg->hooknum=4
 reg->pf=10 and reg->hooknum=4
 reg->pf=10 and reg->hooknum=1
 reg->pf=10 and reg->hooknum=1
 reg->pf=7 and reg->hooknum=3
 reg->pf=7 and reg->hooknum=4
 reg->pf=7 and reg->hooknum=0
 reg->pf=2 and reg->hooknum=4
 reg->pf=2 and reg->hooknum=2
 reg->pf=2 and reg->hooknum=3
 reg->pf=10 and reg->hooknum=4
 reg->pf=10 and reg->hooknum=2
 reg->pf=10 and reg->hooknum=3
 reg->pf=7 and reg->hooknum=1
 reg->pf=7 and reg->hooknum=2
 reg->pf=7 and reg->hooknum=3
 reg->pf=2 and reg->hooknum=0
 reg->pf=2 and reg->hooknum=3
 reg->pf=2 and reg->hooknum=0
 reg->pf=2 and reg->hooknum=3
 reg->pf=2 and reg->hooknum=4
 reg->pf=2 and reg->hooknum=4
 reg->pf=2 and reg->hooknum=1
 reg->pf=2 and reg->hooknum=1
 reg->pf=10 and reg->hooknum=0
 reg->pf=10 and reg->hooknum=3
 reg->pf=10 and reg->hooknum=0
 reg->pf=10 and reg->hooknum=3
 reg->pf=10 and reg->hooknum=4
 reg->pf=10 and reg->hooknum=4
 reg->pf=10 and reg->hooknum=1
 reg->pf=10 and reg->hooknum=1
 reg->pf=7 and reg->hooknum=3
 reg->pf=7 and reg->hooknum=4
 reg->pf=7 and reg->hooknum=0

and putting that through "sort -n" and "uniq -c", I get:

      4  reg->pf=10 and reg->hooknum=0
      4  reg->pf=10 and reg->hooknum=1
      2  reg->pf=10 and reg->hooknum=2
      6  reg->pf=10 and reg->hooknum=3
      6  reg->pf=10 and reg->hooknum=4
      4  reg->pf=2 and reg->hooknum=0
      4  reg->pf=2 and reg->hooknum=1
      2  reg->pf=2 and reg->hooknum=2
      6  reg->pf=2 and reg->hooknum=3
      6  reg->pf=2 and reg->hooknum=4
      2  reg->pf=7 and reg->hooknum=0
      2  reg->pf=7 and reg->hooknum=1
      2  reg->pf=7 and reg->hooknum=2
      4  reg->pf=7 and reg->hooknum=3

which doesn't look much better. But clearly there's a lot of those
"try to unregister stuff that you can't even find".

Maybe it tells you something.

               Linus

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