From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with ESMTP id DB9F16B002C for ; Wed, 12 Oct 2011 16:35:58 -0400 (EDT) Received: from hpaq2.eem.corp.google.com (hpaq2.eem.corp.google.com [172.25.149.2]) by smtp-out.google.com with ESMTP id p9CKZtVh026722 for ; Wed, 12 Oct 2011 13:35:55 -0700 Received: from pzd13 (pzd13.prod.google.com [10.243.17.205]) by hpaq2.eem.corp.google.com with ESMTP id p9CKUrU0009471 (version=TLSv1/SSLv3 cipher=RC4-SHA bits=128 verify=NOT) for ; Wed, 12 Oct 2011 13:35:53 -0700 Received: by pzd13 with SMTP id 13so1436130pzd.3 for ; Wed, 12 Oct 2011 13:35:53 -0700 (PDT) Date: Wed, 12 Oct 2011 13:35:51 -0700 (PDT) From: David Rientjes Subject: Re: possible slab deadlock while doing ifenslave In-Reply-To: <201110121019.53100.hans@schillstrom.com> Message-ID: References: <201110121019.53100.hans@schillstrom.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Hans Schillstrom Cc: linux-mm@kvack.org On Wed, 12 Oct 2011, Hans Schillstrom wrote: > Hello, > I got this when I was testing a VLAN patch i.e. using Dave Millers net-next from today. > When doing this on a single core i686 I got the warning every time, > however ifenslave is not hanging it's just a warning > Have not been testing this on a multicore jet. > > There is no warnings with a 3.0.4 kernel. > > Is this a known warning ? > > ~ # ifenslave bond0 eth1 eth2 > > ============================================= > [ INFO: possible recursive locking detected ] > 3.1.0-rc9+ #3 > --------------------------------------------- > ifenslave/749 is trying to acquire lock: > (&(&parent->list_lock)->rlock){-.-...}, at: [] cache_flusharray+0x41/0xdb > > but task is already holding lock: > (&(&parent->list_lock)->rlock){-.-...}, at: [] cache_flusharray+0x41/0xdb > Hmm, the only candidate that I can see that may have caused this is 83835b3d9aec ("slab, lockdep: Annotate slab -> rcu -> debug_object -> slab"). Could you try reverting that patch in your local tree and seeing if it helps? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org