netdev - Re: Bug, kernel panic, NULL dereference , cleanup_once / icmp_route_lookup.clone.19.clone / nat , 2.6.39-rc7-git11

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Message-ID: <1305782397.3019.5.camel@edumazet-laptop>
Date:	Thu, 19 May 2011 07:19:57 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Denys Fedoryshchenko <denys@...p.net.lb>
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>
Subject: Re: Bug, kernel panic, NULL dereference , cleanup_once /
 icmp_route_lookup.clone.19.clone / nat , 2.6.39-rc7-git11

Le mercredi 18 mai 2011 à 21:29 +0200, Eric Dumazet a écrit :
> Le mercredi 18 mai 2011 à 17:52 +0200, Eric Dumazet a écrit :
> 
> > Hmm, it seems we have some inetpeer refcount leak somewhere.
> > 
> > Maybe one (struct rtable)->peer is not released on dst/rtable removal,
> > or we also leak dst/rtable (and their ->peer inetpeer)
> > 
> > Watch :
> > 
> > grep peer /proc/slabinfo
> > grep dst /proc/slabinfo
> > 
> 
> FYI, I started a bisection to find the faulty commit.
> 

Oh well, of course this came to 2c8cec5c10bced240
(ipv4: Cache learned PMTU information in inetpeer.)

So my method to check if we have a leak might be wrong, since the above
commit let cache full of garbage, and hope that following lookups will
find and evict obsolete dst.

Thats getting difficult :(

Could you please send us

grep . /proc/sys/net/ipv4/route/*

Thanks !


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