On Tue, Oct 23, 2012 at 9:05 AM, Qiang Gao <gaoqiangscut@xxxxxxxxx> 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@xxxxxxx> 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>