On Wed, 2009-06-17 at 16:54 -0700, Eric W. Biederman wrote: > > Subject: net: make namespace iteration possible under RCU > > > > We already call rcu_barrier(), so all we need to take > > care of is using proper RCU list add/del primitives. > > This of course gives you a network namespace that can be found by for_each_net rcu > while the per net exit functions are running. I think that opens up to races > that I don't want to think about. Indeed. Can we move the rcu_barrier() up? Or we could insert a synchronize_rcu() (which is sufficient for rcu_read_lock) before the exit functions are run? > I still haven't tracked down how I am occasionally getting time wait sockets > with an invalid network namespace. Ouch. johannes
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