On Mon 22-10-12 10:16:43, Qiang Gao wrote: > I don't know whether the process will exit finally, bug this stack lasts > for hours, which is obviously unnormal. > The situation: we use a command calld "cglimit" to fork-and-exec the > worker process,and the "cglimit" will > set some limitation on the worker with cgroup. for now,we limit the > memory,and we also use cpu cgroup,but with > no limiation,so when the worker is running, the cgroup directory looks like > following: > > /cgroup/memory/worker : this directory limit the memory > /cgroup/cpu/worker :with no limit,but worker process is in. > > for some reason(some other process we didn't consider), the worker process > invoke global oom-killer, Are you sure that this is really global oom? What was the limit for the group? > not cgroup-oom-killer. then the worker process hangs there. > > Actually, if we didn't set the worker process into the cpu cgroup, this > will never happens. Strange and it smells like a misconfiguration. Could you provide the compllete setting for both controllers? grep . -r /cgroup/ > 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? > > > > -- > > Michal Hocko > > SUSE Labs > > -- Michal Hocko SUSE Labs -- 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>