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Date: Mon, 08 Jan 2007 08:57:10 -0800 From: Ben Greear <greearb@...delatech.com> To: Jarek Poplawski <jarkao2@...pl> CC: David Miller <davem@...emloft.net>, herbert@...dor.apana.org.au, dlstevens@...ibm.com, netdev@...r.kernel.org Subject: Re: BUG: soft lockup detected on CPU#0! (2.6.18.2 plus hacks) Jarek Poplawski wrote: > On Fri, Jan 05, 2007 at 12:33:43PM -0800, Ben Greear wrote: > ... > >> So, I do believe this was the problem we were hitting, and it seems fixed. >> > > Congratulations! > > But I can see one strange thing in vlan.c: > > /* Must be invoked with RCU read lock (no preempt) */ > static struct vlan_group *__vlan_find_group(int real_dev_ifindex) > ... > * Must be invoked with RCU read lock (no preempt) > */ > struct net_device *__find_vlan_dev(struct net_device *real_dev, > ... > > But later in this file no sign of disabling preemption > for these calls and for hlist_add_head_rcu and hlist_del_rcu. > > I can't imagine how this works? > Perhaps...I didn't RCU-ify VLANs, but I can take a look. For the record, the soft lockup was using MAC-VLANs, not 802.1Q VLANs, so it wouldn't have been affected by bugs in VLANs one way or the other. Ben > Jarek P. > -- Ben Greear <greearb@...delatech.com> Candela Technologies Inc http://www.candelatech.com - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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