Re: 2.6.13-rc5-mm1: BUG: rwlock recursion on CPU#0

[Harald Welte <laforge@netfilter.org>]

On Sun, Aug 14, 2005 at 08:15:53PM -0600, Zwane Mwaikambo wrote:

> Is the following patch correct? ip_conntrack_event_cache should never be 
> called with ip_conntrack_lock held and ct_add_counters does not need to be 
> called with ip_conntrack_lock held.

No, it's not correct.  ct_add_countes has to be called from within
write_lock_bh() on ip_conntrack_lock.

So if you keep the ct_add_counters() call where it is and only apply the
rest of your patch (i.e. deferring of ip_conntrack_event_cache() call),
then I think your patch would work.

However, the whole eventcache needs to be audited, it's called from a
number of places.

As Patrick wrote he's working on a solution, I'm not going to intervene
or replicate his work.  As a interim solution I'd suggest disabling
CONFIG_IP_NF_CT_ACCT [which can't be vital anyway, since it was only
added in net-2.6.14 (and thus -mm)].

Cheers,
-- 
- Harald Welte <laforge@netfilter.org>                 http://netfilter.org/
============================================================================
  "Fragmentation is like classful addressing -- an interesting early
   architectural error that shows how much experimentation was going
   on while IP was being designed."                    -- Paul Vixie

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