Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755192Ab3FRJ6a (ORCPT ); Tue, 18 Jun 2013 05:58:30 -0400 Received: from merlin.infradead.org ([205.233.59.134]:39697 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751905Ab3FRJ63 (ORCPT ); Tue, 18 Jun 2013 05:58:29 -0400 Date: Tue, 18 Jun 2013 11:58:21 +0200 From: Peter Zijlstra To: Steven Rostedt Cc: Dave Jones , "Paul E. McKenney" , Linux Kernel , fweisbec@gmail.com, mingo@kernel.org Subject: Re: Another RCU trace. (3.10-rc5) Message-ID: <20130618095821.GJ3204@twins.programming.kicks-ass.net> References: <20130610195145.GA26068@redhat.com> <20130610203355.GO5146@linux.vnet.ibm.com> <20130610210123.GA27154@redhat.com> <1370899008.9844.126.camel@gandalf.local.home> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1370899008.9844.126.camel@gandalf.local.home> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3141 Lines: 63 On Mon, Jun 10, 2013 at 05:16:48PM -0400, Steven Rostedt wrote: > On Mon, 2013-06-10 at 17:01 -0400, Dave Jones wrote: > > On Mon, Jun 10, 2013 at 01:33:55PM -0700, Paul E. McKenney wrote: > > > > > > I saw some of Steven's patches get merged on Friday, is there anything else > > > > outstanding that didn't make it in yet that I could test ? > > > > Or is this another new bug ? > > > > > > I have three fixes queued up at: > > > > > > git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/urgent > > > > > > Kind of hard to tell whether they are relevant given the interleaved > > > stack traces, but can't hurt to try them out. > > > > Here's another. Looks different. > > > > [ 2739.921649] =============================== > > [ 2739.923894] [ INFO: suspicious RCU usage. ] > > [ 2739.926144] 3.10.0-rc5+ #6 Not tainted > > [ 2739.928397] ------------------------------- > > [ 2739.930670] include/linux/rcupdate.h:780 rcu_read_lock() used illegally while idle! > > [ 2739.933826] > > other info that might help us debug this: > > > > [ 2739.939663] > > RCU used illegally from idle CPU! > > rcu_scheduler_active = 1, debug_locks = 0 > > [ 2739.946345] RCU used illegally from extended quiescent state! > > [ 2739.949123] 2 locks held by trinity-child1/4385: > > [ 2739.951537] #0: (&rq->lock){-.-.-.}, at: [] __schedule+0xef/0x9c0 > > [ 2739.955316] #1: (rcu_read_lock){.+.+..}, at: [] cpuacct_charge+0x5/0x1f0 > > [ 2739.959101] > > stack backtrace: > > [ 2739.962529] CPU: 1 PID: 4385 Comm: trinity-child1 Not tainted 3.10.0-rc5+ #6 > > [ 2739.970870] 0000000000000000 ffff8802247e3cf8 ffffffff816e39db ffff8802247e3d28 > > [ 2739.974556] ffffffff810b5987 ffff880200f02568 000000000032585b ffff880200f02520 > > [ 2739.978353] 0000000000000001 ffff8802247e3d60 ffffffff810a57a5 ffffffff810a5625 > > [ 2739.982052] Call Trace: > > [ 2739.984098] [] dump_stack+0x19/0x1b > > [ 2739.986996] [] lockdep_rcu_suspicious+0xe7/0x120 > > [ 2739.990080] [] cpuacct_charge+0x185/0x1f0 > > [ 2739.992971] [] ? cpuacct_charge+0x5/0x1f0 > > [ 2739.994716] [] update_curr+0xec/0x250 > > [ 2739.995873] [] put_prev_task_fair+0x228/0x480 > > [ 2739.997036] [] __schedule+0x166/0x9c0 > > [ 2739.998192] [] ? __cond_resched_softirq+0x60/0x60 > > [ 2739.999344] [] preempt_schedule+0x44/0x60 > > Yeah, this one is fixed by a patch I sent out earlier, and I believe > Peter Zijlstra is going to push it. It wasn't part of my queue. > > Peter, Are you going to take the preempt_schedule_context() patch? I have it queued, I just seem to have some problems locating Ingo to stuff patches into -tip :/ Will continue prodding.. Ingo if you're reading! :-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/