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Date: Tue, 23 Oct 2012 18:10:33 +0800 From: Qiang Gao <gaoqiangscut@...il.com> To: Michal Hocko <mhocko@...e.cz> Cc: Balbir Singh <bsingharora@...il.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>, "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>, linux-mm@...ck.org Subject: Re: process hangs on do_exit when oom happens On Tue, Oct 23, 2012 at 5:50 PM, Michal Hocko <mhocko@...e.cz> wrote: > On Tue 23-10-12 15:18:48, Qiang Gao wrote: >> This process was moved to RT-priority queue when global oom-killer >> happened to boost the recovery of the system.. > > Who did that? oom killer doesn't boost the priority (scheduling class) > AFAIK. > >> but it wasn't get properily dealt with. I still have no idea why where >> the problem is .. > > Well your configuration says that there is no runtime reserved for the > group. > Please refer to Documentation/scheduler/sched-rt-group.txt for more > information. > >> On Tue, Oct 23, 2012 at 12:40 PM, Balbir Singh <bsingharora@...il.com> wrote: >> > On Tue, Oct 23, 2012 at 9:05 AM, Qiang Gao <gaoqiangscut@...il.com> wrote: >> >> information about the system is in the attach file "information.txt" >> >> >> >> I can not reproduce it in the upstream 3.6.0 kernel.. >> >> >> >> On Sat, Oct 20, 2012 at 12:04 AM, Michal Hocko <mhocko@...e.cz> wrote: >> >>> On Wed 17-10-12 18:23:34, gaoqiang wrote: >> >>>> I looked up nothing useful with google,so I'm here for help.. >> >>>> >> >>>> when this happens: I use memcg to limit the memory use of a >> >>>> process,and when the memcg cgroup was out of memory, >> >>>> the process was oom-killed however,it cannot really complete the >> >>>> exiting. here is the some information >> >>> >> >>> How many tasks are in the group and what kind of memory do they use? >> >>> Is it possible that you were hit by the same issue as described in >> >>> 79dfdacc memcg: make oom_lock 0 and 1 based rather than counter. >> >>> >> >>>> OS version: centos6.2 2.6.32.220.7.1 >> >>> >> >>> Your kernel is quite old and you should be probably asking your >> >>> distribution to help you out. There were many fixes since 2.6.32. >> >>> Are you able to reproduce the same issue with the current vanila kernel? >> >>> >> >>>> /proc/pid/stack >> >>>> --------------------------------------------------------------- >> >>>> >> >>>> [<ffffffff810597ca>] __cond_resched+0x2a/0x40 >> >>>> [<ffffffff81121569>] unmap_vmas+0xb49/0xb70 >> >>>> [<ffffffff8112822e>] exit_mmap+0x7e/0x140 >> >>>> [<ffffffff8105b078>] mmput+0x58/0x110 >> >>>> [<ffffffff81061aad>] exit_mm+0x11d/0x160 >> >>>> [<ffffffff81061c9d>] do_exit+0x1ad/0x860 >> >>>> [<ffffffff81062391>] do_group_exit+0x41/0xb0 >> >>>> [<ffffffff81077cd8>] get_signal_to_deliver+0x1e8/0x430 >> >>>> [<ffffffff8100a4c4>] do_notify_resume+0xf4/0x8b0 >> >>>> [<ffffffff8100b281>] int_signal+0x12/0x17 >> >>>> [<ffffffffffffffff>] 0xffffffffffffffff >> >>> >> >>> This looks strange because this is just an exit part which shouldn't >> >>> deadlock or anything. Is this stack stable? Have you tried to take check >> >>> it more times? >> > >> > Looking at information.txt, I found something interesting >> > >> > rt_rq[0]:/1314 >> > .rt_nr_running : 1 >> > .rt_throttled : 1 >> > .rt_time : 0.856656 >> > .rt_runtime : 0.000000 >> > >> > >> > cfs_rq[0]:/1314 >> > .exec_clock : 8738.133429 >> > .MIN_vruntime : 0.000001 >> > .min_vruntime : 8739.371271 >> > .max_vruntime : 0.000001 >> > .spread : 0.000000 >> > .spread0 : -9792.255554 >> > .nr_spread_over : 1 >> > .nr_running : 0 >> > .load : 0 >> > .load_avg : 7376.722880 >> > .load_period : 7.203830 >> > .load_contrib : 1023 >> > .load_tg : 1023 >> > .se->exec_start : 282004.715064 >> > .se->vruntime : 18435.664560 >> > .se->sum_exec_runtime : 8738.133429 >> > .se->wait_start : 0.000000 >> > .se->sleep_start : 0.000000 >> > .se->block_start : 0.000000 >> > .se->sleep_max : 0.000000 >> > .se->block_max : 0.000000 >> > .se->exec_max : 77.977054 >> > .se->slice_max : 0.000000 >> > .se->wait_max : 2.664779 >> > .se->wait_sum : 29.970575 >> > .se->wait_count : 102 >> > .se->load.weight : 2 >> > >> > So 1314 is a real time process and >> > >> > cpu.rt_period_us: >> > 1000000 >> > ---------------------- >> > cpu.rt_runtime_us: >> > 0 >> > >> > When did tt move to being a Real Time process (hint: see nr_running >> > and nr_throttled)? >> > >> > Balbir >> -- >> To unsubscribe from this list: send the line "unsubscribe cgroups" in >> the body of a message to majordomo@...r.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- > Michal Hocko > SUSE Labs > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ maybe this is not a upstream-kernel bug. the centos/redhat kernel would boost the process to RT prio when the process was selected by oom-killer. I think I should report this to redhat/centos.thanks for your attention -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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