linux-kernel - Re: [slab poison overwritten] Re: [GIT] Networking

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Message-ID: <1300730838.2884.578.camel@edumazet-laptop>
Date:	Mon, 21 Mar 2011 19:07:18 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	David Miller <davem@...emloft.net>, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnd Bergmann <arnd@...db.de>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Simon Horman <horms@...ge.net.au>
Subject: Re: [slab poison overwritten] Re: [GIT] Networking

Le lundi 21 mars 2011 à 18:39 +0100, Ingo Molnar a écrit :
> here's the same but with kallsyms enabled.
> 
> Thanks,
> 
> 	Ingo
> 
> [    9.585627] initcall 0xffffffff81d5b806 returned 0 after 0 usecs
> [    9.588960] calling  0xffffffff81d5b9da @ 1
> [    9.592303] IPVS: Creating netns size=1272 id=0
> [    9.595646] IPVS: __ip_vs_control_init(): alloc_percpu.
> [    9.602298] IPVS: cannot register namespace.
> [    9.605627] IPVS: can't setup control

It seems IPVS is busted in case of memory allocation error in 
__ip_vs_control_init()

IPVS deinits its "struct netns_ipvs" space, but something (in IPVS) uses
it after free.

__ip_vs_init() seems to be called before ip_vs_init() completes
correctly. We then keep in net->ipvs a pointer to some freed memory.

Commit 14e405461e664b7 did some changes in this area

Simon, any idea ?



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