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Date: Mon, 16 Sep 2013 15:40:14 +0200 From: Michal Hocko <mhocko@...e.cz> To: azurIt <azurit@...ox.sk> Cc: Johannes Weiner <hannes@...xchg.org>, Andrew Morton <akpm@...ux-foundation.org>, David Rientjes <rientjes@...gle.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, linux-mm@...ck.org, cgroups@...r.kernel.org, x86@...nel.org, linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [patch 0/7] improve memcg oom killer robustness v2 On Sat 14-09-13 12:48:31, azurIt wrote: [...] > Here is the first occurence, this night between 5:15 and 5:25: > - this time i kept opened terminal from other server to this problematic one with htop running > - when server went down i opened it and saw one process of one user running at the top and taking 97% of CPU (cgroup 1304) I guess you do not have a stack trace(s) for that process? That would be extremely helpful. > - everything was stucked so that htop didn't help me much > - luckily, my new 'load check' script, which i was mentioning before, was able to kill apache and everything went to normal (success with it's very first version, wow ;) ) > - i checked some other logs and everything seems to point to cgroup 1304, also kernel log at 5:14-15 is showing hard OOM in that cgroup: > http://watchdog.sk/lkml/kern7.log I am not sure what you mean by hard OOM because there is no global OOM in that log: $ grep "Kill process" kern7.log | sed 's@.*]\(.*Kill process\>\).*@\1@' | sort -u Memory cgroup out of memory: Kill process But you had a lot of memcg OOMs in that group (1304) during that time (and even earlier): $ grep "\<1304\>" kern7.log Sep 14 05:03:45 server01 kernel: [188287.778020] Task in /1304/uid killed as a result of limit of /1304 Sep 14 05:03:46 server01 kernel: [188287.871427] [30433] 1304 30433 181781 66426 7 0 0 apache2 Sep 14 05:03:46 server01 kernel: [188287.871594] [30808] 1304 30808 169111 53866 4 0 0 apache2 Sep 14 05:03:46 server01 kernel: [188287.871742] [30809] 1304 30809 181168 65992 2 0 0 apache2 Sep 14 05:03:46 server01 kernel: [188287.871890] [30811] 1304 30811 168684 53399 3 0 0 apache2 Sep 14 05:03:46 server01 kernel: [188287.872041] [30814] 1304 30814 181102 65924 3 0 0 apache2 Sep 14 05:03:46 server01 kernel: [188287.872189] [30815] 1304 30815 168814 53451 4 0 0 apache2 Sep 14 05:03:46 server01 kernel: [188287.877731] Task in /1304/uid killed as a result of limit of /1304 Sep 14 05:03:46 server01 kernel: [188287.973155] [30808] 1304 30808 169111 53918 3 0 0 apache2 Sep 14 05:03:46 server01 kernel: [188287.973155] [30809] 1304 30809 181168 65992 2 0 0 apache2 Sep 14 05:03:46 server01 kernel: [188287.973155] [30811] 1304 30811 168684 53399 3 0 0 apache2 Sep 14 05:03:46 server01 kernel: [188287.973155] [30814] 1304 30814 181102 65924 3 0 0 apache2 Sep 14 05:03:46 server01 kernel: [188287.973155] [30815] 1304 30815 168815 53558 0 0 0 apache2 Sep 14 05:03:47 server01 kernel: [188289.137540] Task in /1304/uid killed as a result of limit of /1304 Sep 14 05:03:47 server01 kernel: [188289.231873] [30809] 1304 30809 182662 67534 7 0 0 apache2 Sep 14 05:03:47 server01 kernel: [188289.232021] [30811] 1304 30811 171920 56781 4 0 0 apache2 Sep 14 05:03:47 server01 kernel: [188289.232171] [30814] 1304 30814 182596 67470 3 0 0 apache2 Sep 14 05:03:47 server01 kernel: [188289.232319] [30815] 1304 30815 171920 56778 1 0 0 apache2 Sep 14 05:03:47 server01 kernel: [188289.232478] [30896] 1304 30896 171918 56761 0 0 0 apache2 [...] Sep 14 05:14:00 server01 kernel: [188902.666893] Task in /1304/uid killed as a result of limit of /1304 Sep 14 05:14:00 server01 kernel: [188902.742928] [ 7806] 1304 7806 178891 64008 6 0 0 apache2 Sep 14 05:14:00 server01 kernel: [188902.743080] [ 7910] 1304 7910 175318 60302 2 0 0 apache2 Sep 14 05:14:00 server01 kernel: [188902.743228] [ 7911] 1304 7911 174943 59878 1 0 0 apache2 Sep 14 05:14:00 server01 kernel: [188902.743376] [ 7912] 1304 7912 171568 56404 3 0 0 apache2 Sep 14 05:14:00 server01 kernel: [188902.743524] [ 7914] 1304 7914 174911 59879 5 0 0 apache2 Sep 14 05:14:00 server01 kernel: [188902.743673] [ 7915] 1304 7915 173472 58386 2 0 0 apache2 Sep 14 05:14:02 server01 kernel: [188904.249749] Task in /1304/uid killed as a result of limit of /1304 Sep 14 05:14:02 server01 kernel: [188904.336276] [ 7910] 1304 7910 176278 61211 6 0 0 apache2 Sep 14 05:14:02 server01 kernel: [188904.336276] [ 7911] 1304 7911 176278 61211 7 0 0 apache2 Sep 14 05:14:02 server01 kernel: [188904.336276] [ 7912] 1304 7912 173732 58655 3 0 0 apache2 Sep 14 05:14:02 server01 kernel: [188904.336276] [ 7914] 1304 7914 176269 61211 7 0 0 apache2 Sep 14 05:14:02 server01 kernel: [188904.336276] [ 7915] 1304 7915 176269 61211 7 0 0 apache2 Sep 14 05:14:02 server01 kernel: [188904.336276] [ 7966] 1304 7966 170385 55164 7 0 0 apache2 Sep 14 05:14:02 server01 kernel: [188904.340992] Task in /1304/uid killed as a result of limit of /1304 Sep 14 05:14:02 server01 kernel: [188904.424284] [ 7911] 1304 7911 176340 61332 2 0 0 apache2 Sep 14 05:14:02 server01 kernel: [188904.424284] [ 7912] 1304 7912 173996 58901 1 0 0 apache2 Sep 14 05:14:02 server01 kernel: [188904.424284] [ 7914] 1304 7914 176331 61331 4 0 0 apache2 Sep 14 05:14:02 server01 kernel: [188904.424284] [ 7915] 1304 7915 176331 61331 2 0 0 apache2 Sep 14 05:14:02 server01 kernel: [188904.424284] [ 7966] 1304 7966 170385 55164 7 0 0 apache2 [...] The only thing that is clear from this is that there is always one process killed and a new one is spawned and that leads to the same out of memory situation. So this is precisely what Johannes already described as a Hydra load. There is a silence in the logs: Sep 14 05:14:39 server01 kernel: [188940.869639] Killed process 8453 (apache2) total-vm:710732kB, anon-rss:245680kB, file-rss:4588kB Sep 14 05:21:24 server01 kernel: [189344.518699] grsec: From 95.103.217.66: failed fork with errno EAGAIN by /bin/dash[sh:10362] uid/euid:1387/1387 g id/egid:100/100, parent /usr/sbin/cron[cron:10144] uid/euid:0/0 gid/egid:0/0 Myabe that is what you are referring to as a stuck situation. Is pid 8453 the task you have seen consuming the CPU? If yes, then we would need a stack for that task to find out what is going on. Other than that nothing really suspicious in the log AFAICS. -- 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/
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