From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751521AbaCaXCw (ORCPT ); Mon, 31 Mar 2014 19:02:52 -0400 Received: from mx1.redhat.com ([209.132.183.28]:59790 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750977AbaCaXCv (ORCPT ); Mon, 31 Mar 2014 19:02:51 -0400 Date: Mon, 31 Mar 2014 19:02:41 -0400 From: Dave Jones To: paulmck@linux.vnet.ibm.com Cc: Linux Kernel Subject: rcu_prempt stalls / lockup Message-ID: <20140331230241.GA30019@redhat.com> Mail-Followup-To: Dave Jones , paulmck@linux.vnet.ibm.com, Linux Kernel MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org You can tell the merge window is open, because I'm back to breaking RCU. [ 1023.934532] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1023.935501] (detected by 0, t=6502 jiffies, g=28666, c=28665, q=0) [ 1023.936299] INFO: Stall ended before state dump start [ 1218.871404] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1218.872399] (detected by 0, t=26007 jiffies, g=28666, c=28665, q=0) [ 1218.873256] INFO: Stall ended before state dump start [ 1413.808406] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1413.809387] (detected by 0, t=45512 jiffies, g=28666, c=28665, q=0) [ 1413.810113] INFO: Stall ended before state dump start [ 1608.745637] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1608.746614] (detected by 0, t=65017 jiffies, g=28666, c=28665, q=0) [ 1608.747327] INFO: Stall ended before state dump start [ 1803.682892] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1803.683876] (detected by 1, t=84522 jiffies, g=28666, c=28665, q=0) [ 1803.684741] INFO: Stall ended before state dump start [ 1998.620169] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1998.621123] (detected by 0, t=104027 jiffies, g=28666, c=28665, q=0) [ 1998.621916] INFO: Stall ended before state dump start [ 2193.557459] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 2193.558425] (detected by 0, t=123532 jiffies, g=28666, c=28665, q=0) [ 2193.559248] INFO: Stall ended before state dump start [ 2388.494719] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 2388.495688] (detected by 0, t=143037 jiffies, g=28666, c=28665, q=0) [ 2388.496417] INFO: Stall ended before state dump start [ 2583.431983] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 2583.432967] (detected by 0, t=162542 jiffies, g=28666, c=28665, q=0) [ 2583.433852] INFO: Stall ended before state dump start [ 2778.369242] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 2778.370235] (detected by 0, t=182047 jiffies, g=28666, c=28665, q=0) [ 2778.371037] INFO: Stall ended before state dump start [ 2973.306537] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 2973.307540] (detected by 0, t=201552 jiffies, g=28666, c=28665, q=0) [ 2973.308347] INFO: Stall ended before state dump start [ 3168.244036] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 3168.245056] (detected by 0, t=221057 jiffies, g=28666, c=28665, q=0) [ 3168.245805] INFO: Stall ended before state dump start [ 3363.181458] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 3363.182496] (detected by 0, t=240562 jiffies, g=28666, c=28665, q=0) [ 3363.183289] INFO: Stall ended before state dump start [ 3558.118835] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 3558.119879] (detected by 0, t=260067 jiffies, g=28666, c=28665, q=0) [ 3558.120739] INFO: Stall ended before state dump start at that point, userspace stopped responding. cursor on console was blinking, but I couldn't even switch tty's, or sysrq dump. rc8 was fine, so this is todays rcu changes. Dave