From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752413AbbC0Vgp (ORCPT ); Fri, 27 Mar 2015 17:36:45 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:44463 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751634AbbC0Vgl (ORCPT ); Fri, 27 Mar 2015 17:36:41 -0400 Message-ID: <5515CD4C.1050806@oracle.com> Date: Fri, 27 Mar 2015 17:36:12 -0400 From: Sasha Levin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-Version: 1.0 To: Vlastimil Babka , "linux-mm@kvack.org" CC: Johannes Weiner , Mel Gorman , Rik van Riel , Hugh Dickins , LKML Subject: Re: mm: lru_add_drain_all hangs References: <5514CF37.1020403@oracle.com> <55152BED.9050500@suse.cz> In-Reply-To: <55152BED.9050500@suse.cz> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Source-IP: userv0022.oracle.com [156.151.31.74] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/27/2015 06:07 AM, Vlastimil Babka wrote: >> [ 3614.918852] trinity-c7 D ffff8802f4487b58 26976 16252 9410 0x10000000 >> > [ 3614.919580] ffff8802f4487b58 ffff8802f6b98ca8 0000000000000000 0000000000000000 >> > [ 3614.920435] ffff88017d3e0558 ffff88017d3e0530 ffff8802f6b98008 ffff88016bad0000 >> > [ 3614.921219] ffff8802f6b98000 ffff8802f4487b38 ffff8802f4480000 ffffed005e890002 >> > [ 3614.922069] Call Trace: >> > [ 3614.922346] schedule (./arch/x86/include/asm/bitops.h:311 (discriminator 1) kernel/sched/core.c:2827 (discriminator 1)) >> > [ 3614.923023] schedule_preempt_disabled (kernel/sched/core.c:2859) >> > [ 3614.923707] mutex_lock_nested (kernel/locking/mutex.c:585 kernel/locking/mutex.c:623) >> > [ 3614.924486] ? lru_add_drain_all (mm/swap.c:867) >> > [ 3614.925211] ? trace_hardirqs_on_caller (kernel/locking/lockdep.c:2580 kernel/locking/lockdep.c:2622) >> > [ 3614.925970] ? lru_add_drain_all (mm/swap.c:867) >> > [ 3614.926692] ? mutex_trylock (kernel/locking/mutex.c:621) >> > [ 3614.927464] ? mpol_new (mm/mempolicy.c:285) >> > [ 3614.928044] lru_add_drain_all (mm/swap.c:867) >> > [ 3614.928608] migrate_prep (mm/migrate.c:64) >> > [ 3614.929092] SYSC_mbind (mm/mempolicy.c:1188 mm/mempolicy.c:1319) >> > [ 3614.929619] ? rcu_eqs_exit_common (kernel/rcu/tree.c:735 (discriminator 8)) >> > [ 3614.930318] ? __mpol_equal (mm/mempolicy.c:1304) >> > [ 3614.930877] ? trace_hardirqs_on (kernel/locking/lockdep.c:2630) >> > [ 3614.931485] ? syscall_trace_enter_phase2 (arch/x86/kernel/ptrace.c:1592) >> > [ 3614.932184] SyS_mbind (mm/mempolicy.c:1301) > That looks like trinity-c7 is waiting ot in too, but later on (after some more > listings like this for trinity-c7, probably threads?) we have: > It keeps changing constantly, even in this trace the process is blocking on the mutex rather than doing something useful, and in the next trace it's a different process. Thanks, Sasha