Messages in this thread | | | Subject | Re: [PATCH for 3.2] memcg: do not trap chargers with full callstack on OOM | Date | Sun, 14 Jul 2013 01:26:41 +0200 | From | "azurIt" <> |
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> CC: "Johannes Weiner" <hannes@cmpxchg.org>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, "cgroups mailinglist" <cgroups@vger.kernel.org>, "KAMEZAWA Hiroyuki" <kamezawa.hiroyu@jp.fujitsu.com>, righi.andrea@gmail.com >On Wed 10-07-13 18:25:06, azurIt wrote: >> >> Now i realized that i forgot to remove UID from that cgroup before >> >> trying to remove it, so cgroup cannot be removed anyway (we are using >> >> third party cgroup called cgroup-uid from Andrea Righi, which is able >> >> to associate all user's processes with target cgroup). Look here for >> >> cgroup-uid patch: >> >> https://www.develer.com/~arighi/linux/patches/cgroup-uid/cgroup-uid-v8.patch >> >> >> >> ANYWAY, i'm 101% sure that 'tasks' file was empty and 'under_oom' was >> >> permanently '1'. >> > >> >This is really strange. Could you post the whole diff against stable >> >tree you are using (except for grsecurity stuff and the above cgroup-uid >> >patch)? >> >> >> Here are all patches which i applied to kernel 3.2.48 in my last test: >> http://watchdog.sk/lkml/patches3/ > >The two patches from Johannes seem correct. > >From a quick look even grsecurity patchset shouldn't interfere as it >doesn't seem to put any code between handle_mm_fault and mm_fault_error >and there also doesn't seem to be any new handle_mm_fault call sites. > >But I cannot tell there aren't other code paths which would lead to a >memcg charge, thus oom, without proper FAULT_FLAG_KERNEL handling.
Michal,
now i can definitely confirm that problem with unremovable cgroups persists. What info do you need from me? I applied also your little 'WARN_ON' patch.
azur
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