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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[SERVER-8134] Memory Leak in 2.3.0</title>
                <link>https://jira.mongodb.org/browse/SERVER-8134</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;2.3.0 showing steady increase in virtual non-mapped memory - symptomatic of a memory leak.&lt;/p&gt;</description>
                <environment></environment>
        <key id="61549">SERVER-8134</key>
            <summary>Memory Leak in 2.3.0</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="4">Incomplete</resolution>
                                        <assignee username="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="mark">Mark porter</reporter>
                        <labels>
                    </labels>
                <created>Thu, 10 Jan 2013 12:00:54 +0000</created>
                <updated>Fri, 8 Mar 2013 15:55:51 +0000</updated>
                            <resolved>Fri, 15 Feb 2013 14:51:24 +0000</resolved>
                                    <version>2.3.0</version>
                                                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="267158" author="james.wahlin@10gen.com" created="Fri, 15 Feb 2013 15:21:53 +0000"  >&lt;p&gt;Note that a map-reduce triggered memory leak was recently fixed under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8442&quot; title=&quot;Map-reduce memory leak&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8442&quot;&gt;&lt;del&gt;SERVER-8442&lt;/del&gt;&lt;/a&gt;. This impacted 2.3.0 as well as earlier releases.&lt;/p&gt;</comment>
                            <comment id="252288" author="benjamin.becker" created="Mon, 28 Jan 2013 23:41:26 +0000"  >&lt;p&gt;Hi Ian,&lt;/p&gt;

&lt;p&gt;It&apos;s hard to identify the cause without knowing more about the workload.  This JIRA ticket was filed for a leak in v2.3.0, which was still using spidermonkey.  You could try with v2.3.0, or try &lt;a href=&quot;http://www.mongodb.org/display/DOCS/Building+for+Linux&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;building mongodb&lt;/a&gt; with spidermonkey by passing the &apos;--usesm&apos; flag to scons (note you will need to &apos;git checkout r2.3.2&apos;).&lt;/p&gt;

&lt;p&gt;The most useful way for us to determine the cause would be a script to reproduce the leak.  I can provide a secure private SCP server for you to upload scripts if that&apos;s any easier.&lt;/p&gt;

&lt;p&gt;     Thanks,&lt;br/&gt;
     Ben&lt;/p&gt;</comment>
                            <comment id="252258" author="ibeaver" created="Mon, 28 Jan 2013 23:03:56 +0000"  >&lt;p&gt;I have not had time to create standalone script to reproduce this yet, but I was able to test it on 2.2.3-rc1 and could not reproduce it.  With the same client code, data, and cluster configuration 2.2.3-rc1 appears stable.  After 50 min of running 2.3.2 would be out of swap and killed, after 50 min on 2.2.3-rc1 the primary shard was only using 2GB ram.  Perhaps its related to the v8 switch?&lt;/p&gt;</comment>
                            <comment id="248910" author="ibeaver" created="Thu, 24 Jan 2013 19:06:15 +0000"  >&lt;p&gt;Attached memory report from primary shard showing all memory and swap usage and then getting killed by the kernel OOM.&lt;/p&gt;</comment>
                            <comment id="247987" author="benjamin.becker" created="Wed, 23 Jan 2013 21:04:06 +0000"  >&lt;p&gt;Thanks Ian.  A script to reproduce would be very helpful.&lt;/p&gt;</comment>
                            <comment id="247976" author="ibeaver" created="Wed, 23 Jan 2013 20:57:37 +0000"  >&lt;p&gt;I cant attach the actual code as its part of a propriety code base, but I will try to reproduce it with a test script.  I was originally thinking that the mongod on the primary shard was just dying without an error since it used to segfault in 2.3.1, but now I see in the syslog the OOM killer killed it.&lt;/p&gt;


&lt;p&gt;Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932403&amp;#93;&lt;/span&gt; mongod invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0, oom_score_adj=0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932409&amp;#93;&lt;/span&gt; mongod cpuset=/ mems_allowed=0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932411&amp;#93;&lt;/span&gt; Pid: 22447, comm: mongod Not tainted 3.2.0-35-generic #55-Ubuntu&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932413&amp;#93;&lt;/span&gt; Call Trace:&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932423&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff810c0e7d&amp;gt;&amp;#93;&lt;/span&gt; ? cpuset_print_task_mems_allowed+0x9d/0xb0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932428&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff8111bdc1&amp;gt;&amp;#93;&lt;/span&gt; dump_header+0x91/0xe0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932430&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff8111c145&amp;gt;&amp;#93;&lt;/span&gt; oom_kill_process+0x85/0xb0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932432&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff8111c4ea&amp;gt;&amp;#93;&lt;/span&gt; out_of_memory+0xfa/0x220&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932435&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff81121eec&amp;gt;&amp;#93;&lt;/span&gt; __alloc_pages_nodemask+0x8dc/0x8f0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932440&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff81158f26&amp;gt;&amp;#93;&lt;/span&gt; alloc_pages_current+0xb6/0x120&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932443&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff81118a47&amp;gt;&amp;#93;&lt;/span&gt; __page_cache_alloc+0xb7/0xd0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932446&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff8111aca4&amp;gt;&amp;#93;&lt;/span&gt; filemap_fault+0x234/0x3e0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932463&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff8116f5cb&amp;gt;&amp;#93;&lt;/span&gt; ? mem_cgroup_update_page_stat+0x2b/0x110&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932466&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff8113b332&amp;gt;&amp;#93;&lt;/span&gt; __do_fault+0x72/0x550&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932469&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff8165b0cf&amp;gt;&amp;#93;&lt;/span&gt; ? schedule+0x3f/0x60&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932472&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff8113e9ca&amp;gt;&amp;#93;&lt;/span&gt; handle_pte_fault+0xfa/0x200&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932474&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff8113ee88&amp;gt;&amp;#93;&lt;/span&gt; handle_mm_fault+0x1f8/0x350&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932478&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff81660ad0&amp;gt;&amp;#93;&lt;/span&gt; do_page_fault+0x150/0x520&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932480&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff8165bff4&amp;gt;&amp;#93;&lt;/span&gt; ? do_nanosleep+0xa4/0xd0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932484&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff81090708&amp;gt;&amp;#93;&lt;/span&gt; ? hrtimer_nanosleep+0xb8/0x180&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932487&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff8108f2d0&amp;gt;&amp;#93;&lt;/span&gt; ? update_rmtp+0x70/0x70&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932490&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff810900c4&amp;gt;&amp;#93;&lt;/span&gt; ? hrtimer_start_range_ns+0x14/0x20&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932492&amp;#93;&lt;/span&gt;  &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;lt;ffffffff8165d735&amp;gt;&amp;#93;&lt;/span&gt; page_fault+0x25/0x30&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932494&amp;#93;&lt;/span&gt; Mem-Info:&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932495&amp;#93;&lt;/span&gt; Node 0 DMA per-cpu:&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932498&amp;#93;&lt;/span&gt; CPU    0: hi:    0, btch:   1 usd:   0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932499&amp;#93;&lt;/span&gt; CPU    1: hi:    0, btch:   1 usd:   0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932501&amp;#93;&lt;/span&gt; CPU    2: hi:    0, btch:   1 usd:   0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932502&amp;#93;&lt;/span&gt; CPU    3: hi:    0, btch:   1 usd:   0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932504&amp;#93;&lt;/span&gt; CPU    4: hi:    0, btch:   1 usd:   0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932505&amp;#93;&lt;/span&gt; CPU    5: hi:    0, btch:   1 usd:   0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932507&amp;#93;&lt;/span&gt; CPU    6: hi:    0, btch:   1 usd:   0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932508&amp;#93;&lt;/span&gt; CPU    7: hi:    0, btch:   1 usd:   0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932509&amp;#93;&lt;/span&gt; Node 0 DMA32 per-cpu:&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932511&amp;#93;&lt;/span&gt; CPU    0: hi:  186, btch:  31 usd:  37&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932513&amp;#93;&lt;/span&gt; CPU    1: hi:  186, btch:  31 usd:  22&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932514&amp;#93;&lt;/span&gt; CPU    2: hi:  186, btch:  31 usd:  20&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932516&amp;#93;&lt;/span&gt; CPU    3: hi:  186, btch:  31 usd:  14&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932517&amp;#93;&lt;/span&gt; CPU    4: hi:  186, btch:  31 usd:  15&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932519&amp;#93;&lt;/span&gt; CPU    5: hi:  186, btch:  31 usd:  13&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932520&amp;#93;&lt;/span&gt; CPU    6: hi:  186, btch:  31 usd:  11&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932522&amp;#93;&lt;/span&gt; CPU    7: hi:  186, btch:  31 usd:  30&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932523&amp;#93;&lt;/span&gt; Node 0 Normal per-cpu:&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932525&amp;#93;&lt;/span&gt; CPU    0: hi:  186, btch:  31 usd:  26&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932526&amp;#93;&lt;/span&gt; CPU    1: hi:  186, btch:  31 usd:  81&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932528&amp;#93;&lt;/span&gt; CPU    2: hi:  186, btch:  31 usd:  88&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932529&amp;#93;&lt;/span&gt; CPU    3: hi:  186, btch:  31 usd:  30&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932530&amp;#93;&lt;/span&gt; CPU    4: hi:  186, btch:  31 usd:  39&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932532&amp;#93;&lt;/span&gt; CPU    5: hi:  186, btch:  31 usd:  13&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932533&amp;#93;&lt;/span&gt; CPU    6: hi:  186, btch:  31 usd:  60&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932535&amp;#93;&lt;/span&gt; CPU    7: hi:  186, btch:  31 usd: 137&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932538&amp;#93;&lt;/span&gt; active_anon:3543847 inactive_anon:421374 isolated_anon:0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932539&amp;#93;&lt;/span&gt;  active_&lt;a href=&quot;file:267&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:267&lt;/a&gt; inactive_&lt;a href=&quot;file:555&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:555&lt;/a&gt; isolated_&lt;a href=&quot;file:0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:0&lt;/a&gt;&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932540&amp;#93;&lt;/span&gt;  unevictable:0 dirty:3 writeback:128 unstable:0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932541&amp;#93;&lt;/span&gt;  free:33649 slab_reclaimable:5765 slab_unreclaimable:6544&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932541&amp;#93;&lt;/span&gt;  mapped:378 shmem:5 pagetables:39476 bounce:0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932543&amp;#93;&lt;/span&gt; Node 0 DMA free:15892kB min:64kB low:80kB high:96kB active_anon:0kB inactive_anon:0kB active_&lt;a href=&quot;file:0kB&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:0kB&lt;/a&gt; inactive_&lt;a href=&quot;file:0kB&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:0kB&lt;/a&gt; unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15652kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:16kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932550&amp;#93;&lt;/span&gt; lowmem_reserve[]: 0 3246 16098 16098&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932553&amp;#93;&lt;/span&gt; Node 0 DMA32 free:64996kB min:13616kB low:17020kB high:20424kB active_anon:2668776kB inactive_anon:534236kB active_&lt;a href=&quot;file:464kB&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:464kB&lt;/a&gt; inactive_&lt;a href=&quot;file:300kB&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:300kB&lt;/a&gt; unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3324872kB mlocked:0kB dirty:0kB writeback:52kB mapped:388kB shmem:0kB slab_reclaimable:4484kB slab_unreclaimable:3232kB kernel_stack:1096kB pagetables:30744kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:2255 all_unreclaimable? yes&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932561&amp;#93;&lt;/span&gt; lowmem_reserve[]: 0 0 12852 12852&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932564&amp;#93;&lt;/span&gt; Node 0 Normal free:53708kB min:53900kB low:67372kB high:80848kB active_anon:11506612kB inactive_anon:1151260kB active_&lt;a href=&quot;file:604kB&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:604kB&lt;/a&gt; inactive_&lt;a href=&quot;file:1920kB&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:1920kB&lt;/a&gt; unevictable:0kB isolated(anon):0kB isolated(file):0kB present:13160448kB mlocked:0kB dirty:12kB writeback:460kB mapped:1124kB shmem:20kB slab_reclaimable:18576kB slab_unreclaimable:22928kB kernel_stack:3008kB pagetables:127160kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:5549 all_unreclaimable? yes&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932571&amp;#93;&lt;/span&gt; lowmem_reserve[]: 0 0 0 0&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932574&amp;#93;&lt;/span&gt; Node 0 DMA: 1*4kB 0*8kB 1*16kB 0*32kB 2*64kB 1*128kB 1*256kB 0*512kB 1*1024kB 1*2048kB 3*4096kB = 15892kB&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932581&amp;#93;&lt;/span&gt; Node 0 DMA32: 583*4kB 1388*8kB 188*16kB 270*32kB 167*64kB 85*128kB 40*256kB 9*512kB 2*1024kB 1*2048kB 0*4096kB = 65596kB&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932588&amp;#93;&lt;/span&gt; Node 0 Normal: 12355*4kB 7*8kB 1*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 1*4096kB = 53588kB&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932595&amp;#93;&lt;/span&gt; 4610 total pagecache pages&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932596&amp;#93;&lt;/span&gt; 3539 pages in swap cache&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932597&amp;#93;&lt;/span&gt; Swap cache stats: add 6003912, delete 6000373, find 289681/334479&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932599&amp;#93;&lt;/span&gt; Free swap  = 0kB&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498032.932600&amp;#93;&lt;/span&gt; Total swap = 16774140kB&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009125&amp;#93;&lt;/span&gt; 4194288 pages RAM&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009129&amp;#93;&lt;/span&gt; 85746 pages reserved&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009130&amp;#93;&lt;/span&gt; 5605 pages shared&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009131&amp;#93;&lt;/span&gt; 4072393 pages non-shared&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009132&amp;#93;&lt;/span&gt; [ pid ]   uid  tgid total_vm      rss cpu oom_adj oom_score_adj name&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009149&amp;#93;&lt;/span&gt; [  567]     0   567     3797        0   5       0             0 upstart-socket-&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009153&amp;#93;&lt;/span&gt; [  709]     0   709    12489        0   7     -17         -1000 sshd&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009156&amp;#93;&lt;/span&gt; [  732]   101   732    82871       66   3       0             0 rsyslogd&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009159&amp;#93;&lt;/span&gt; [  767]   102   767     5987        0   2       0             0 dbus-daemon&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009163&amp;#93;&lt;/span&gt; [  904]     0   904     3946        1   4       0             0 getty&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009166&amp;#93;&lt;/span&gt; [  911]     0   911     3946        1   0       0             0 getty&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009169&amp;#93;&lt;/span&gt; [  946]     0   946     3946        1   1       0             0 getty&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009172&amp;#93;&lt;/span&gt; [  947]     0   947     3946        1   0       0             0 getty&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009174&amp;#93;&lt;/span&gt; [  949]     0   949     3946        1   1       0             0 getty&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009177&amp;#93;&lt;/span&gt; [  955]     0   955     1082        0   0       0             0 acpid&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009180&amp;#93;&lt;/span&gt; [  957]     0   957     4227        4   0       0             0 atd&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009200&amp;#93;&lt;/span&gt; [  958]     0   958     4778       21   3       0             0 cron&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009203&amp;#93;&lt;/span&gt; [  991]     0   991     3995       23   3       0             0 irqbalance&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009222&amp;#93;&lt;/span&gt; [ 1046]   103  1046    46894        0   2       0             0 whoopsie&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009242&amp;#93;&lt;/span&gt; [ 1090]     0  1090    35109      354   3       0             0 apache2&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009245&amp;#93;&lt;/span&gt; [ 1124]     0  1124     3946        1   0       0             0 getty&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009248&amp;#93;&lt;/span&gt; [ 1163]     0  1163    18340        0   2       0             0 sshd&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009251&amp;#93;&lt;/span&gt; [ 1295]  1000  1295    18340       33   3       0             0 sshd&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009254&amp;#93;&lt;/span&gt; [ 1296]  1000  1296     6578      171   4       0             0 bash&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009274&amp;#93;&lt;/span&gt; &lt;span class=&quot;error&quot;&gt;&amp;#91;16910&amp;#93;&lt;/span&gt;     0 16910     4308        0   5       0             0 upstart-udev-br&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009277&amp;#93;&lt;/span&gt; &lt;span class=&quot;error&quot;&gt;&amp;#91;16912&amp;#93;&lt;/span&gt;     0 16912     5334        1   5     -17         -1000 udevd&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009282&amp;#93;&lt;/span&gt; [ 5636]     0  5636     5333        1   2     -17         -1000 udevd&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009304&amp;#93;&lt;/span&gt; [ 5667]     0  5667     5333        0   4     -17         -1000 udevd&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009307&amp;#93;&lt;/span&gt; &lt;span class=&quot;error&quot;&gt;&amp;#91;17769&amp;#93;&lt;/span&gt;  1001 17769   106264     3760   1       0             0 mongod&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009310&amp;#93;&lt;/span&gt; &lt;span class=&quot;error&quot;&gt;&amp;#91;17787&amp;#93;&lt;/span&gt;  1001 17787    60093      735   6       0             0 mongos&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009313&amp;#93;&lt;/span&gt; &lt;span class=&quot;error&quot;&gt;&amp;#91;23506&amp;#93;&lt;/span&gt; 65534 23506   120763      221   2       0             0 gmetad&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009316&amp;#93;&lt;/span&gt; &lt;span class=&quot;error&quot;&gt;&amp;#91;23527&amp;#93;&lt;/span&gt;   999 23527    13224      641   2       0             0 gmond&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009319&amp;#93;&lt;/span&gt; &lt;span class=&quot;error&quot;&gt;&amp;#91;22439&amp;#93;&lt;/span&gt;  1001 22439 48999141  3949504   3       0             0 mongod&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009322&amp;#93;&lt;/span&gt; [ 5076]    33  5076    35414      712   6       0             0 apache2&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009325&amp;#93;&lt;/span&gt; [ 5157]    33  5157    35525      885   6       0             0 apache2&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009328&amp;#93;&lt;/span&gt; [ 5204]    33  5204    35346      642   6       0             0 apache2&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009331&amp;#93;&lt;/span&gt; [ 5321]    33  5321    35384      748   2       0             0 apache2&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009334&amp;#93;&lt;/span&gt; [ 5568]    33  5568    35458      783   6       0             0 apache2&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009353&amp;#93;&lt;/span&gt; [ 6073]    33  6073    35382      749   2       0             0 apache2&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009356&amp;#93;&lt;/span&gt; [ 6191]    33  6191    35382      735   6       0             0 apache2&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009359&amp;#93;&lt;/span&gt; [ 6341]    33  6341    35346      645   1       0             0 apache2&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009363&amp;#93;&lt;/span&gt; [ 6390]    33  6390    35426      717   6       0             0 apache2&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009366&amp;#93;&lt;/span&gt; [ 6421]    33  6421    35339      569   7       0             0 apache2&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009369&amp;#93;&lt;/span&gt; [ 6459]    33  6459    35121      385   1       0             0 apache2&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009372&amp;#93;&lt;/span&gt; [ 6460]    33  6460     1100       25   3       0             0 sh&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009375&amp;#93;&lt;/span&gt; [ 6461]    33  6461     1100       24   0       0             0 sh&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009378&amp;#93;&lt;/span&gt; [ 6462]    33  6462     1100       25   7       0             0 sh&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009381&amp;#93;&lt;/span&gt; [ 6463]    33  6463     1100       25   3       0             0 sh&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009383&amp;#93;&lt;/span&gt; [ 6464]    33  6464     1100       25   5       0             0 sh&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009386&amp;#93;&lt;/span&gt; [ 6465]    33  6465     1100       25   4       0             0 sh&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009389&amp;#93;&lt;/span&gt; [ 6466]    33  6466    18196      276   6       0             0 rrdtool&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009392&amp;#93;&lt;/span&gt; [ 6467]    33  6467    18196      280   3       0             0 rrdtool&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009395&amp;#93;&lt;/span&gt; [ 6468]    33  6468    18196      276   5       0             0 rrdtool&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009398&amp;#93;&lt;/span&gt; [ 6469]    33  6469    18226      282   1       0             0 rrdtool&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009400&amp;#93;&lt;/span&gt; [ 6470]    33  6470    18226      282   6       0             0 rrdtool&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009403&amp;#93;&lt;/span&gt; [ 6471]    33  6471    18226      283   3       0             0 rrdtool&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009406&amp;#93;&lt;/span&gt; Out of memory: Kill process 22439 (mongod) score 982 or sacrifice child&lt;br/&gt;
Jan 23 11:52:53 mongonode1 kernel: &lt;span class=&quot;error&quot;&gt;&amp;#91;498033.009600&amp;#93;&lt;/span&gt; Killed process 22439 (mongod) total-vm:195996564kB, anon-rss:15798016kB, file-rss:0kB&lt;/p&gt;

&lt;p&gt;My ulimit settings:&lt;/p&gt;

&lt;p&gt;mongo@mongonode1:~$ ulimit -a&lt;br/&gt;
core file size          (blocks, -c) 0&lt;br/&gt;
data seg size           (kbytes, -d) unlimited&lt;br/&gt;
scheduling priority             (-e) 0&lt;br/&gt;
file size               (blocks, -f) unlimited&lt;br/&gt;
pending signals                 (-i) 128254&lt;br/&gt;
max locked memory       (kbytes, -l) 64&lt;br/&gt;
max memory size         (kbytes, -m) unlimited&lt;br/&gt;
open files                      (-n) 63000&lt;br/&gt;
pipe size            (512 bytes, -p) 8&lt;br/&gt;
POSIX message queues     (bytes, -q) 819200&lt;br/&gt;
real-time priority              (-r) 0&lt;br/&gt;
stack size              (kbytes, -s) 8192&lt;br/&gt;
cpu time               (seconds, -t) unlimited&lt;br/&gt;
max user processes              (-u) 128254&lt;br/&gt;
virtual memory          (kbytes, -v) unlimited&lt;br/&gt;
file locks                      (-x) unlimited&lt;/p&gt;</comment>
                            <comment id="247965" author="benjamin.becker" created="Wed, 23 Jan 2013 20:42:11 +0000"  >&lt;p&gt;Hi Ian,&lt;/p&gt;

&lt;p&gt;Would it be possible to attach a copy of your MapReduce script?  Also, could you clarify what you mean by silently dies?&lt;/p&gt;</comment>
                            <comment id="247957" author="ibeaver" created="Wed, 23 Jan 2013 20:31:31 +0000"  >&lt;p&gt;I am seeing what I think is this issue in 2.3.2 as well.  When running map/reduce jobs that write out to a collection and then drop it later the memory never seems to be freed.  In 2.3.1 the primary shard would quickly march through all memory, swap and then segfault.  In 2.3.2 it marches through all memory and swap, slows to a crawl for a while and then silently dies.&lt;/p&gt;

&lt;p&gt;I have more info on the mongodb-user group: &lt;a href=&quot;https://groups.google.com/forum/#!topic/mongodb-user/mL3K5JbAa1Q&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/#!topic/mongodb-user/mL3K5JbAa1Q&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="236279" author="scotthernandez" created="Thu, 10 Jan 2013 16:41:21 +0000"  >&lt;p&gt;Probably best to get it tested in 2.3.2 when it comes out since it is a development release. So much has changed.&lt;/p&gt;</comment>
                    </comments>
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