Re: slab corruption with current -git

[Linus Torvalds]

On Mon, Oct 10, 2016 at 5:30 PM, David Miller <davem@xxxxxxxxxxxxx> 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