netdev - Re: [oops] with FIB

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Date:	Sun, 17 May 2009 15:44:28 +0200
From:	Robert Olsson <robert@...ur.slu.se>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Robert Olsson <Robert.Olsson@...a.slu.se>,
	Stephen Hemminger <shemminger@...tta.com>,
	andrei.popa@...eo.ro, NetDEV list <netdev@...r.kernel.org>
Subject: Re: [oops] with FIB_TRIE


Paul E. McKenney writes:

 > >  Need to recap this... at least for myself insert, delete and flush is 
 > >  serialised wrt RTNL I guess this is still OK. We oops in lookup but 
 > >  we should have preempt_disable as we're in a RCU read section. Also we 
 > >  know quagga is constantly running delete...
 > 
 > RCU read-side critical sections are not preempt_disable() if you have
 > built with CONFIG_PREEMPT_RCU.

I've just fixed a setup so we can verify the oops easily in the lab. 

# CONFIG_PREEMPT_RCU is not set
# CONFIG_PREEMPT_RCU_TRACE is not set
# CONFIG_PREEMPT_NONE is not set
CONFIG_PREEMPT_VOLUNTARY=y
# CONFIG_PREEMPT is not set

Any suggestion where to start? 
I'll guess we'll need to instrument a bit and try to understand what happens. 
softirq can be run by ksoftirqd

CONFIG_PREEMPT=y
ftp://robur.slu.se/pub/Linux/net-development/trie-test/OOPS

Cheers
					--ro

Stephen. rcu_read_lock_bh in trie_loop didn't make any difference
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