Messages in this thread | | | Subject | Re: PROBLEM with summary: Re: [PATCH] netfilter: per netns nf_conntrack_cachep | From | Jon Masters <> | Date | Tue, 02 Feb 2010 12:23:01 -0500 |
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On Tue, 2010-02-02 at 18:16 +0100, Eric Dumazet wrote: > Le mardi 02 février 2010 à 18:04 +0100, Patrick McHardy a écrit : > > > Ah nice catch, that seems to be the problem. When the untracked > > conntrack is already attached to an skb and thus has refcnt > 1 > > and we re-initalize the refcnt, it will get freed. > > > > The question is whether the ct_net pointer of the untracked conntrack > > is actually required. If so, we need one instance per namespace, > > otherwise we can just move initialization and cleanup to the init_net > > init/cleanup functions. Alexey, do you happen to know this? > > > > One untracked per netns seems the way to go, and move it outside of > read_mostly area too, we obviously can modify its refcount frequently...
Sure, that will work. Also, rather than just the NF_CT_ASSERT on the use count, maybe worth catching the specific case of trying to free the untracked ct, but that's only if it's not a horrible fast path.
Anyway, thanks. If you want to send me a patch, I'll try it.
Jon.
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