Re: [patch] Real-Time Preemption, -VP-2.6.9-rc4-mm1-U1

[Ingo Molnar <mingo@elte.hu>]

* Ingo Molnar <mingo@elte.hu> wrote:

> > as part of single stepping the init sequence. I stopped at this point
> > to make sure I had a good record of the messages.
> 
> could you try to disable SELINUX? It seems it's not fully safe yet.

there wasnt all that much missing for SELINUX + PREEMPT_REALTIME
support. Could you try the patch below - does it fix your box?

	Ingo

--- linux/net/ipv4/af_inet.c.orig
+++ linux/net/ipv4/af_inet.c
@@ -242,7 +242,7 @@ static int inet_create(struct socket *so
 
 	/* Look for the requested type/protocol pair. */
 	answer = NULL;
-	rcu_read_lock();
+	rcu_read_lock_spin(&inetsw_lock);
 	list_for_each_rcu(p, &inetsw[sock->type]) {
 		answer = list_entry(p, struct inet_protosw, list);
 
@@ -276,7 +276,7 @@ static int inet_create(struct socket *so
 	answer_prot = answer->prot;
 	answer_no_check = answer->no_check;
 	answer_flags = answer->flags;
-	rcu_read_unlock();
+	rcu_read_unlock_spin(&inetsw_lock);
 
 	BUG_TRAP(answer_prot->slab != NULL);
 
@@ -345,7 +345,7 @@ static int inet_create(struct socket *so
 out:
 	return err;
 out_rcu_unlock:
-	rcu_read_unlock();
+	rcu_read_unlock_spin(&inetsw_lock);
 	goto out;
 }