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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-1593] Mongos segmentation faults </title>
                <link>https://jira.mongodb.org/browse/SERVER-1593</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;mongos process crashes often in sharding environment with 2 shard servers, 1 config server, and 80 mongos processes (one for each appserver).&lt;/p&gt;

&lt;p&gt;The segfault on one of the machines:&lt;/p&gt;

&lt;p&gt;Aug  7 23:40:54 lo24-sv-13 kernel: mongos&lt;span class=&quot;error&quot;&gt;&amp;#91;30474&amp;#93;&lt;/span&gt;: segfault at&lt;br/&gt;
0000000000368d58 rip 00000034a52711d8 rsp 0000000067049d00 error 4 &lt;/p&gt;

&lt;p&gt;See &lt;a href=&quot;http://groups.google.com/group/mongodb-user/browse_thread/thread/d959d31338205398&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://groups.google.com/group/mongodb-user/browse_thread/thread/d959d31338205398&lt;/a&gt; for further details&lt;/p&gt;</description>
                <environment>CentOS 5.3, Java Driver (Version from master 4.8.2010), dynamically linked mongos</environment>
        <key id="12711">SERVER-1593</key>
            <summary>Mongos segmentation faults </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="alerner">Alberto Lerner</assignee>
                                    <reporter username="breadfan">Chris Wewerka</reporter>
                        <labels>
                    </labels>
                <created>Mon, 9 Aug 2010 12:56:22 +0000</created>
                <updated>Tue, 29 May 2012 14:53:16 +0000</updated>
                            <resolved>Thu, 26 Aug 2010 20:32:16 +0000</resolved>
                                    <version>1.6.0</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="17822" author="breadfan" created="Mon, 6 Sep 2010 14:08:56 +0000"  >&lt;p&gt;Sorry Alberto, it was decided to move away from mongoDb like also described in Server-1633 &lt;a href=&quot;http://jira.mongodb.org/browse/SERVER-1633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&amp;amp;focusedCommentId=17664#action_17664&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;http://jira.mongodb.org/browse/SERVER-1633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&amp;amp;focusedCommentId=17664#action_17664&lt;/a&gt;. &lt;/p&gt;</comment>
                            <comment id="17471" author="alerner" created="Thu, 26 Aug 2010 20:32:16 +0000"  >&lt;p&gt;Chris, I still can&apos;t reproduce it here. In the past few days, there were several fixes that may as well addressed what you&apos;re seeing. By all means, if you see a crash again, please send us a report and we&apos;d be glad to look at it. I&apos;m putting this on hold  in the meantime.&lt;/p&gt;</comment>
                            <comment id="17171" author="alerner" created="Mon, 23 Aug 2010 14:03:25 +0000"  >&lt;p&gt;Hi, Crhis, how is the situation with the new nightly? If the crashes are still happening, could you send us the logs? We added coded to dump stack traces to them if something bad happens. &lt;/p&gt;</comment>
                            <comment id="17033" author="alerner" created="Thu, 19 Aug 2010 13:26:09 +0000"  >&lt;p&gt;Chris, any progress on this?&lt;/p&gt;</comment>
                            <comment id="16991" author="alerner" created="Tue, 17 Aug 2010 21:34:42 +0000"  >&lt;p&gt;The past entries in the JIRA were about a new way to report crashes in mongos. We tested them here and we got detailed stack traces even under very high memory pressure.&lt;/p&gt;

&lt;p&gt;These changes will make it to tonight&apos;s nightly. Could you try it and report? We&apos;re hoping the log of a mongos crash will tell us more about the root causes. It would be great if you sent us those.&lt;/p&gt;</comment>
                            <comment id="16978" author="auto" created="Tue, 17 Aug 2010 15:52:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;alerner&apos;, &apos;name&apos;: &apos;Alberto Lerner&apos;, &apos;email&apos;: &apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1593&quot; title=&quot;Mongos segmentation faults &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1593&quot;&gt;&lt;del&gt;SERVER-1593&lt;/del&gt;&lt;/a&gt; hook new signal handler to mongos&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/573e9682e3982d0ae54c3b635bb0b00077cc3cd2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/573e9682e3982d0ae54c3b635bb0b00077cc3cd2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="16977" author="auto" created="Tue, 17 Aug 2010 15:32:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;alerner&apos;, &apos;name&apos;: &apos;Alberto Lerner&apos;, &apos;email&apos;: &apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1593&quot; title=&quot;Mongos segmentation faults &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1593&quot;&gt;&lt;del&gt;SERVER-1593&lt;/del&gt;&lt;/a&gt; log debugging symbols in the stack trace too&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/53ba584a157d87970390a927806d1e7e496a3224&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/53ba584a157d87970390a927806d1e7e496a3224&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="16964" author="auto" created="Tue, 17 Aug 2010 00:57:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;alerner&apos;, &apos;name&apos;: &apos;Alberto Lerner&apos;, &apos;email&apos;: &apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1593&quot; title=&quot;Mongos segmentation faults &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1593&quot;&gt;&lt;del&gt;SERVER-1593&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1593&quot; title=&quot;Mongos segmentation faults &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1593&quot;&gt;&lt;del&gt;SERVER-1593&lt;/del&gt;&lt;/a&gt; signal handler should compile under windows too (take 2)&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/4b8ca5f9bd2ed54cc76aa27293a2a825fad0a8ad&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/4b8ca5f9bd2ed54cc76aa27293a2a825fad0a8ad&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="16963" author="auto" created="Tue, 17 Aug 2010 00:57:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;alerner&apos;, &apos;name&apos;: &apos;Alberto Lerner&apos;, &apos;email&apos;: &apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1593&quot; title=&quot;Mongos segmentation faults &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1593&quot;&gt;&lt;del&gt;SERVER-1593&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1593&quot; title=&quot;Mongos segmentation faults &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1593&quot;&gt;&lt;del&gt;SERVER-1593&lt;/del&gt;&lt;/a&gt; signal handler should compile under windows too (take 2)&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/4b8ca5f9bd2ed54cc76aa27293a2a825fad0a8ad&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/4b8ca5f9bd2ed54cc76aa27293a2a825fad0a8ad&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="16962" author="auto" created="Tue, 17 Aug 2010 00:28:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;alerner&apos;, &apos;name&apos;: &apos;Alberto Lerner&apos;, &apos;email&apos;: &apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1593&quot; title=&quot;Mongos segmentation faults &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1593&quot;&gt;&lt;del&gt;SERVER-1593&lt;/del&gt;&lt;/a&gt; signal handler should compile under windows too&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/153ae78ee1b920534b148f04bb0a3d97d01a5221&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/153ae78ee1b920534b148f04bb0a3d97d01a5221&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="16961" author="auto" created="Tue, 17 Aug 2010 00:05:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;alerner&apos;, &apos;name&apos;: &apos;Alberto Lerner&apos;, &apos;email&apos;: &apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1593&quot; title=&quot;Mongos segmentation faults &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1593&quot;&gt;&lt;del&gt;SERVER-1593&lt;/del&gt;&lt;/a&gt; a new signal handler for abrupt exit cases&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/b07f1dacedd7498216e16a9339764e66c0b1770d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/b07f1dacedd7498216e16a9339764e66c0b1770d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="16945" author="auto" created="Mon, 16 Aug 2010 20:32:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;alerner&apos;, &apos;name&apos;: &apos;Alberto Lerner&apos;, &apos;email&apos;: &apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1593&quot; title=&quot;Mongos segmentation faults &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1593&quot;&gt;&lt;del&gt;SERVER-1593&lt;/del&gt;&lt;/a&gt; Expose log file descriptor (needed in new segv handler).&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/b1e95d9bee1b14993d56564648c5d54ed1507d58&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/b1e95d9bee1b14993d56564648c5d54ed1507d58&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="16912" author="alerner" created="Mon, 16 Aug 2010 16:15:17 +0000"  >&lt;p&gt;Anything in  particular I should look at? &lt;/p&gt;</comment>
                            <comment id="16860" author="breadfan" created="Fri, 13 Aug 2010 16:45:59 +0000"  >&lt;p&gt;Nagios checks for mongos crash at about Friday 16:00&lt;/p&gt;</comment>
                            <comment id="16859" author="breadfan" created="Fri, 13 Aug 2010 16:45:23 +0000"  >&lt;p&gt;The problem only occurs under really heavy load. We first tried only writes to mongodb and to mysql both, so we don&apos;t loose any data. (reads occur still from mysql)&lt;/p&gt;

&lt;p&gt;I configured our central write &quot;DAO&quot; to use a java thread executor pool and as we reduced the pool size from 10 to 1 per appserver, the crashes we&apos;re much more seldom. But this won&apos;t work under heavy read load when we move from mysql reads to mongo reads since we can&apos;t use delayed reads with threads as we have to present sth. to the user fast.&lt;/p&gt;

&lt;p&gt;I attached our mongos nagios checks for the last crash, and I see an impossible count of connections which can&apos;t be correct, because we allow only 150 Connections in the MongoOptions Object to the Mongos process per appserver. You can also see that the heap size grows very big. But I&apos;m also not sure if the value e.g. for the inserts (taken from mongo shell stats and parsed by nagios) is correct, since it&apos;s so high&lt;/p&gt;
</comment>
                            <comment id="16852" author="alerner" created="Fri, 13 Aug 2010 15:18:13 +0000"  >&lt;p&gt;Unfortunately not much more information than the previous cores.&lt;/p&gt;

&lt;p&gt;Can you tell how long it takes for a mongos to crash? Is it random or does it consistently crash after some time, certain number of events, etc. Are you by any chance monitoring memory foot print of these processes?&lt;/p&gt;

&lt;p&gt;When the process crash do you see anything unusual in the logs before?&lt;/p&gt;

&lt;p&gt;Is there anything in particular about the workload that you&apos;re using? If you run the workload you a controlled seeting, e.g., your laptop/dev machine, do you get a crash too?&lt;/p&gt;
</comment>
                            <comment id="16851" author="breadfan" created="Fri, 13 Aug 2010 14:55:46 +0000"  >&lt;p&gt;Now we have a crash with the nightly version with more debugs. core.19827.gz&lt;/p&gt;</comment>
                            <comment id="16776" author="alerner" created="Thu, 12 Aug 2010 10:29:22 +0000"  >&lt;p&gt;Would it be feasible to try the mongos from the nightly (unstable branch) in one of the app servers instead of 1.6.0? We made two changes that could help us gather more info. One is we report better the exception whose stack you posted yesterday on the JIRA. The other is we change a bit the stack trace code so to increase the chances of getting clean stacks on extreme memory pressure situations.&lt;/p&gt;</comment>
                            <comment id="16770" author="eliot" created="Wed, 11 Aug 2010 22:05:15 +0000"  >&lt;p&gt;It printed in verbose mode and you can get from &quot;db.serverStatus()&quot;  look at the connections sub-object.&lt;/p&gt;</comment>
                            <comment id="16752" author="breadfan" created="Wed, 11 Aug 2010 15:56:16 +0000"  >&lt;p&gt;We also still have 7 appservers with mongos running on it, which say &quot;too many open files&quot;, but the ulimit is 30000.&lt;/p&gt;

&lt;p&gt;May it be possible to add s.th like Squids startup output also for mongos:&lt;/p&gt;

&lt;p&gt;2010/08/11 10:32:25| Starting Squid Cache version 2.7.STABLE7 for x86_64-redhat-linux-gnu...&lt;br/&gt;
2010/08/11 10:32:25| Process ID 8386&lt;br/&gt;
2010/08/11 10:32:25| With 32768 file descriptors available&lt;br/&gt;
2010/08/11 10:32:25| Using epoll for the IO loop&lt;br/&gt;
...&lt;/p&gt;</comment>
                            <comment id="16732" author="breadfan" created="Wed, 11 Aug 2010 09:04:26 +0000"  >&lt;p&gt;more core dumps from other servers&lt;/p&gt;</comment>
                            <comment id="16731" author="breadfan" created="Wed, 11 Aug 2010 09:02:26 +0000"  >&lt;p&gt;more core dump from servers&lt;/p&gt;</comment>
                            <comment id="16730" author="breadfan" created="Wed, 11 Aug 2010 08:45:04 +0000"  >&lt;p&gt;more core dumps from other servers&lt;/p&gt;</comment>
                            <comment id="16729" author="breadfan" created="Wed, 11 Aug 2010 08:35:49 +0000"  >&lt;p&gt;More core dump from other servers&lt;/p&gt;</comment>
                            <comment id="16728" author="breadfan" created="Wed, 11 Aug 2010 07:52:01 +0000"  >&lt;p&gt;Core dump file for the above mentioned crash of mongos. Dump 13146&lt;/p&gt;</comment>
                            <comment id="16727" author="breadfan" created="Wed, 11 Aug 2010 07:45:27 +0000"  >&lt;p&gt;Alberto,&lt;/p&gt;

&lt;p&gt;yes we have a lot of core dump files. Some of them are really big.&lt;/p&gt;

&lt;p&gt;One mongos had also output on the console when crashing:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;
	&lt;ul&gt;
		&lt;li&gt;glibc detected *** /opt/mongo/bin/mongos: free(): invalid pointer: 0x0000000016b62de8 ***&lt;br/&gt;
======= Backtrace: =========&lt;br/&gt;
/lib64/libc.so.6&lt;span class=&quot;error&quot;&gt;&amp;#91;0x351a46f4f4&amp;#93;&lt;/span&gt;&lt;br/&gt;
/lib64/libc.so.6(cfree+0x8c)&lt;span class=&quot;error&quot;&gt;&amp;#91;0x351a472b1c&amp;#93;&lt;/span&gt;&lt;br/&gt;
/usr/lib64/libstdc++.so.6(_ZNSs9_M_mutateEmmm+0x1a8)&lt;span class=&quot;error&quot;&gt;&amp;#91;0x365969d1e8&amp;#93;&lt;/span&gt;&lt;br/&gt;
/usr/lib64/libstdc++.so.6(_ZNSs15_M_replace_safeEmmPKcm+0x2c)&lt;span class=&quot;error&quot;&gt;&amp;#91;0x365969d22c&amp;#93;&lt;/span&gt;&lt;br/&gt;
/opt/mongo/bin/mongos(_ZN5mongo21ShardedMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortE+0x37c)&lt;span class=&quot;error&quot;&gt;&amp;#91;0x6507fc&amp;#93;&lt;/span&gt;&lt;br/&gt;
/opt/mongo/bin/mongos(_ZN5mongo3pms9threadRunEPNS_13MessagingPortE+0x240)&lt;span class=&quot;error&quot;&gt;&amp;#91;0x55ca70&amp;#93;&lt;/span&gt;&lt;br/&gt;
/opt/mongo/bin/mongos(thread_proxy+0x80)&lt;span class=&quot;error&quot;&gt;&amp;#91;0x672880&amp;#93;&lt;/span&gt;&lt;br/&gt;
/lib64/libpthread.so.0&lt;span class=&quot;error&quot;&gt;&amp;#91;0x351b8062f7&amp;#93;&lt;/span&gt;&lt;br/&gt;
/lib64/libc.so.6(clone+0x6d)&lt;span class=&quot;error&quot;&gt;&amp;#91;0x351a4ce85d&amp;#93;&lt;/span&gt;&lt;br/&gt;
======= Memory map: ========&lt;br/&gt;
00400000-00871000 r-xp 00000000 68:05 288007                             /opt/mongodb-linux-x86_64-debugsymbols-1.6.0/bin/mongos&lt;br/&gt;
00a70000-00a85000 rw-p 00470000 68:05 288007                             /opt/mongodb-linux-x86_64-debugsymbols-1.6.0/bin/mongos
		&lt;ul&gt;
			&lt;li&gt;
			&lt;ul&gt;
				&lt;li&gt;a lot more memory dump *****&lt;br/&gt;
7de64000-7e864000 rw-p 7de64000 00:00 0&lt;br/&gt;
7e864000-7e865000 ---p 7e864000 00:00 0&lt;br/&gt;
7e865000-7f265000 rw-p 7e865000 00:00 0&lt;br/&gt;
7f265000-7f266000 ---p 7f265000 00:00 0&lt;br/&gt;
7f266000-7fc66000 rw-p 7f266000 00:00 0&lt;br/&gt;
351a000000-351a01a000 r-xp 00000000 68:05 1056002                        /lib64/ld-2.5.so&lt;br/&gt;
351a219000-351a21a000 r--p 00019000 68:05 1056002                        /lib64/ld-2.5.so&lt;br/&gt;
351a21a000-351a21b000 rw-p 0001a000 68:05 1056002                        /lib64/ld-2.5.so&lt;br/&gt;
351a400000-351a546000 r-xp 00000000 68:05 1056005                        /lib64/libc-2.5.so&lt;br/&gt;
351a546000-351a746000 ---p 00146000 68:05 1056005                        /lib64/libc-2.5.so&lt;br/&gt;
351a746000-351a74a000 r--p 00146000 68:05 1056005                        /lib64/libc-2.5.so&lt;br/&gt;
351a74a000-351a74b000 rw-p 0014a000 68:05 1056005                        /lib64/libc-2.5.so&lt;br/&gt;
351a74b000-351a750000 rw-p 351a74b000 00:00 0&lt;br/&gt;
351b400000-351b482000 r-xp 00000000 68:05 1056022                        /lib64/libm-2.5.so&lt;br/&gt;
351b482000-351b681000 ---p 00082000 68:05 1056022                        /lib64/libm-2.5.so&lt;br/&gt;
351b681000-351b682000 r--p 00081000 68:05 1056022                        /lib64/libm-2.5.so&lt;br/&gt;
351b682000-351b683000 rw-p 00082000 68:05 1056022                        /lib64/libm-2.5.so&lt;br/&gt;
351b800000-351b815000 r-xp 00000000 68:05 1056016                        /lib64/libpthread-2.5.so&lt;br/&gt;
351b815000-351ba14000 ---p 00015000 68:05 1056016                        /lib64/libpthread-2.5.so&lt;br/&gt;
351ba14000-351ba15000 r--p 00014000 68:05 1056016                        /lib64/libpthread-2.5.so&lt;br/&gt;
351ba15000-351ba16000 rw-p 00015000 68:05 1056016                        /lib64/libpthread-2.5.so&lt;br/&gt;
351ba16000-351ba1a000 rw-p 351ba16000 00:00 0&lt;br/&gt;
3659200000-365920d000 r-xp 00000000 68:05 1056017                        /lib64/libgcc_s-4.1.2-20070626.so.1&lt;br/&gt;
365920d000-365940d000 ---p 0000d000 68:05 1056017                        /lib64/libgcc_s-4.1.2-20070626.so.1&lt;br/&gt;
365940d000-365940e000 rw-p 0000d000 68:05 1056017                        /lib64/libgcc_s-4.1.2-20070626.so.1&lt;br/&gt;
3659600000-36596e6000 r-xp 00000000 68:03 457437                         /usr/lib64/libstdc++.so.6.0.8&lt;br/&gt;
36596e6000-36598e5000 ---p 000e6000 68:03 457437                         /usr/lib64/libstdc++.so.6.0.8&lt;br/&gt;
36598e5000-36598eb000 r--p 000e5000 68:03 457437                         /usr/lib64/libstdc++.so.6.0.8&lt;br/&gt;
36598eb000-36598ee000 rw-p 000eb000 68:03 457437                         /usr/lib64/libstdc++.so.6.0.8&lt;br/&gt;
36598ee000-3659900000 rw-p 36598ee000 00:00 0&lt;br/&gt;
2aaaaaaab000-2aaaaaaae000 rw-p 2aaaaaaab000 00:00 0&lt;br/&gt;
2aaaaaab3000-2aaaaaab7000 rw-p 2aaaaaab3000 00:00 0&lt;br/&gt;
2aaaaaab7000-2aaaaaab8000 ---p 2aaaaaab7000 00:00 0&lt;br/&gt;
2aaaaaab8000-2aaaab4b8000 rwxp 2aaaaaab8000 00:00 0&lt;br/&gt;
2aaaab4b8000-2aaaab4b9000 ---p 2aaaab4b8000 00:00 0&lt;br/&gt;
2aaaab4b9000-2aaaabeb9000 rwxp 2Aborted (core dumped)&lt;/li&gt;
			&lt;/ul&gt;
			&lt;/li&gt;
		&lt;/ul&gt;
		&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="16694" author="alerner" created="Tue, 10 Aug 2010 22:11:45 +0000"  >&lt;p&gt;Chris, &lt;/p&gt;

&lt;p&gt;Any new occurrence of this problem?&lt;/p&gt;

&lt;p&gt;Alberto.&lt;/p&gt;</comment>
                            <comment id="16639" author="auto" created="Mon, 9 Aug 2010 19:26:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;alerner&apos;, &apos;name&apos;: &apos;Alberto Lerner&apos;, &apos;email&apos;: &apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1593&quot; title=&quot;Mongos segmentation faults &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1593&quot;&gt;&lt;del&gt;SERVER-1593&lt;/del&gt;&lt;/a&gt; Increase chances of getting a trace under memory shortage&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/4a0c8053f2ec64b28b48e91d334386582a362b59&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/4a0c8053f2ec64b28b48e91d334386582a362b59&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="16615" author="alerner" created="Mon, 9 Aug 2010 15:46:17 +0000"  >&lt;p&gt;Chris,&lt;/p&gt;

&lt;p&gt;From the thread you sent, I&apos;m assuming you&apos;re running on 1.6.0. Is there any chance we can get a stack trace or a core dump or the problem in that version? &lt;/p&gt;

&lt;p&gt;In the meantime, I can look at the stacks you sent for 1.5.7 and check if that&apos;s a problem we have corrected along the way.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Alberto.&lt;/p&gt;</comment>
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