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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-13537] Large skip and and limit values can cause crash in blocking sort stage</title>
                <link>https://jira.mongodb.org/browse/SERVER-13537</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of April 15, 2014&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
Very large values for &lt;tt&gt;.skip()&lt;/tt&gt; and &lt;tt&gt;.limit()&lt;/tt&gt; can cause an out-of-bounds error in the sort stage of a query and crash the server. Specifically, the error is caused when both skip and limit values fit into 32-bit signed ints individually but their sum overflows a signed 32-bit int and flips a positive limit value to a negative one. &lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
Limited, but users can be affected as this is a regression and large limit values previously worked. &lt;/p&gt;

&lt;p&gt;&lt;b&gt;WORKAROUNDS&lt;/b&gt;&lt;br/&gt;
Use a lower limit value to avoid the issue.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;RESOLUTION&lt;/b&gt;&lt;br/&gt;
Cast skip and limit to unsigned int values to ensure the sum doesn&apos;t result in a negative value.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;AFFECTED VERSIONS&lt;/b&gt;&lt;br/&gt;
Version 2.6.0 is affected by this bug.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;PATCHES&lt;/b&gt;&lt;br/&gt;
The patch is included in the 2.6.1 production release.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h6&gt;&lt;a name=&quot;Originaldescription&quot;&gt;&lt;/a&gt;Original description&lt;/h6&gt;

&lt;p&gt;2014-04-10T02:45:04.086+0800 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn952&amp;#93;&lt;/span&gt; SEVERE: Got signal: 6 (Aborted).&lt;br/&gt;
Backtrace:0x11bd301 0x11bc6de 0x3355832960 0x33558328e5 0x33558340c5 0x335582ba0e 0x335582bad0 0xac7944 0xaca025 0xaa6f8f 0xaa082c 0xaaaa81 0xac3661 0xd44534 0xd44f89 0xd47b8a 0xd4acf8 0xb96382 0xb98962 0x76b76f&lt;br/&gt;
 ./mongod(_ZN5mongo15printStackTraceERSo+0x21) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x11bd301&amp;#93;&lt;/span&gt;&lt;br/&gt;
 ./mongod() &lt;span class=&quot;error&quot;&gt;&amp;#91;0x11bc6de&amp;#93;&lt;/span&gt;&lt;br/&gt;
 /lib64/libc.so.6() &lt;span class=&quot;error&quot;&gt;&amp;#91;0x3355832960&amp;#93;&lt;/span&gt;&lt;br/&gt;
 /lib64/libc.so.6(gsignal+0x35) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x33558328e5&amp;#93;&lt;/span&gt;&lt;br/&gt;
 /lib64/libc.so.6(abort+0x175) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x33558340c5&amp;#93;&lt;/span&gt;&lt;br/&gt;
 /lib64/libc.so.6() &lt;span class=&quot;error&quot;&gt;&amp;#91;0x335582ba0e&amp;#93;&lt;/span&gt;&lt;br/&gt;
 /lib64/libc.so.6(__assert_perror_fail+0) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x335582bad0&amp;#93;&lt;/span&gt;&lt;br/&gt;
 ./mongod(_ZN5mongo9SortStage11addToBufferERKNS0_16SortableDataItemE+0x454) &lt;span class=&quot;error&quot;&gt;&amp;#91;0xac7944&amp;#93;&lt;/span&gt;&lt;br/&gt;
 ./mongod(_ZN5mongo9SortStage4workEPm+0x865) &lt;span class=&quot;error&quot;&gt;&amp;#91;0xaca025&amp;#93;&lt;/span&gt;&lt;br/&gt;
 ./mongod(_ZN5mongo7OrStage4workEPm+0x12f) &lt;span class=&quot;error&quot;&gt;&amp;#91;0xaa6f8f&amp;#93;&lt;/span&gt;&lt;br/&gt;
 ./mongod(_ZN5mongo18KeepMutationsStage4workEPm+0x3c) &lt;span class=&quot;error&quot;&gt;&amp;#91;0xaa082c&amp;#93;&lt;/span&gt;&lt;br/&gt;
 ./mongod(_ZN5mongo15ProjectionStage4workEPm+0x51) &lt;span class=&quot;error&quot;&gt;&amp;#91;0xaaaa81&amp;#93;&lt;/span&gt;&lt;br/&gt;
 ./mongod(_ZN5mongo9SkipStage4workEPm+0x61) &lt;span class=&quot;error&quot;&gt;&amp;#91;0xac3661&amp;#93;&lt;/span&gt;&lt;br/&gt;
 ./mongod(_ZN5mongo15MultiPlanRunner12workAllPlansEPNS_7BSONObjE+0x1b4) &lt;span class=&quot;error&quot;&gt;&amp;#91;0xd44534&amp;#93;&lt;/span&gt;&lt;br/&gt;
 ./mongod(_ZN5mongo15MultiPlanRunner12pickBestPlanEPmPNS_7BSONObjE+0xa9) &lt;span class=&quot;error&quot;&gt;&amp;#91;0xd44f89&amp;#93;&lt;/span&gt;&lt;br/&gt;
 ./mongod(_ZN5mongo15MultiPlanRunner7getNextEPNS_7BSONObjEPNS_7DiskLocE+0x3fa) &lt;span class=&quot;error&quot;&gt;&amp;#91;0xd47b8a&amp;#93;&lt;/span&gt;&lt;br/&gt;
 ./mongod(&lt;em&gt;ZN5mongo11newRunQueryERNS_7MessageERNS_12QueryMessageERNS_5CurOpES1&lt;/em&gt;+0x958) &lt;span class=&quot;error&quot;&gt;&amp;#91;0xd4acf8&amp;#93;&lt;/span&gt;&lt;br/&gt;
 ./mongod() &lt;span class=&quot;error&quot;&gt;&amp;#91;0xb96382&amp;#93;&lt;/span&gt;&lt;br/&gt;
 ./mongod(_ZN5mongo16assembleResponseERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortE+0x442) &lt;span class=&quot;error&quot;&gt;&amp;#91;0xb98962&amp;#93;&lt;/span&gt;&lt;br/&gt;
 ./mongod(_ZN5mongo16MyMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortEPNS_9LastErrorE+0x9f) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x76b76f&amp;#93;&lt;/span&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="130334">SERVER-13537</key>
            <summary>Large skip and and limit values can cause crash in blocking sort stage</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="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="tma995@gmail.com">Tianxiang Ma</reporter>
                        <labels>
                    </labels>
                <created>Thu, 10 Apr 2014 06:17:15 +0000</created>
                <updated>Mon, 11 Jul 2016 17:16:17 +0000</updated>
                            <resolved>Mon, 14 Apr 2014 15:25:53 +0000</resolved>
                                    <version>2.6.0</version>
                                    <fixVersion>2.6.1</fixVersion>
                    <fixVersion>2.7.0</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="548807" author="xgen-internal-githook" created="Mon, 14 Apr 2014 17:44:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13537&quot; title=&quot;Large skip and and limit values can cause crash in blocking sort stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13537&quot;&gt;&lt;del&gt;SERVER-13537&lt;/del&gt;&lt;/a&gt; better handle numerical overflow of large limit values&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 3e4b9474749fc3b4df182d813e09a26b0e02fcc6)&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9f1ef97401471aaeb430cb5c4ad9c06ffe7e60c6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9f1ef97401471aaeb430cb5c4ad9c06ffe7e60c6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="548558" author="xgen-internal-githook" created="Mon, 14 Apr 2014 15:25:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13537&quot; title=&quot;Large skip and and limit values can cause crash in blocking sort stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13537&quot;&gt;&lt;del&gt;SERVER-13537&lt;/del&gt;&lt;/a&gt; better handle numerical overflow of large limit values&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3e4b9474749fc3b4df182d813e09a26b0e02fcc6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3e4b9474749fc3b4df182d813e09a26b0e02fcc6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="545252" author="hari.khalsa@10gen.com" created="Fri, 11 Apr 2014 14:02:32 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tma995%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;tma995@gmail.com&quot;&gt;tma995@gmail.com&lt;/a&gt; Thank you very much for finding the query!  We&apos;ll fix this ASAP.  Please do file further tickets for any other issues like this (though I hope there aren&apos;t any!).&lt;/p&gt;</comment>
                            <comment id="544918" author="tma995@gmail.com" created="Fri, 11 Apr 2014 07:13:54 +0000"  >&lt;p&gt;Hi Thomas,&lt;/p&gt;

&lt;p&gt;It turns out not difficult to reproduce the crash, as it was caused by a scheduled daily task which leads to the same crash again today. After debugging, here comes the culprit query:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;db.T_ScheduleResult.find({&quot;scheduleType&quot; : &quot;IMMEDIATE&quot;}, {_id:1}).sort({time:-1}).skip(1000).limit(2147483647)&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;The &quot;limit number&quot; seems too large and makes no sense, however it works for a long time in previous mongodb versions. I tried for a few other db &amp;amp; collections and MongoDB crash at the same stage if query in similar format(find-&amp;gt;sort-&amp;gt;skip-&amp;gt;limit with a large number as above). &lt;/p&gt;

&lt;p&gt;For info of our dev system, please refer to below:&lt;br/&gt;
CentOS 6.4&lt;br/&gt;
MongoDB 2.6, with primary replicaset (the only replicaset)&lt;/p&gt;

&lt;p&gt;Anyway, by redefine the &quot;limit&quot; size to a small number we are able to get around the crash. Hope this helps.&lt;br/&gt;
Thanks,&lt;/p&gt;

&lt;p&gt;TMA&lt;/p&gt;</comment>
                            <comment id="544502" author="thomasr" created="Thu, 10 Apr 2014 23:27:41 +0000"  >&lt;p&gt;Hi Tianxiang,&lt;/p&gt;

&lt;p&gt;Thanks for reporting this issue. In order to investigate and reproduce the crash we would need some more information: &lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Could you attach more of the log file to this ticket?&lt;/li&gt;
	&lt;li&gt;Can you tell us details about your system (OS, sharded / replicaset / standalone node?, etc).&lt;/li&gt;
	&lt;li&gt;Do you know what query/sort was causing the crash?&lt;/li&gt;
	&lt;li&gt;Can you also provide a list of your indexes, with
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;use &amp;lt;database&amp;gt;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.&amp;lt;collection&amp;gt;.getIndexes()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;(insert your database and collection above).&lt;/p&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Thanks,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="543656" author="hari.khalsa@10gen.com" created="Thu, 10 Apr 2014 12:59:09 +0000"  >&lt;p&gt;Hello!  Are you able to reproduce the crash?  If so, can you tell me exactly how to do so?&lt;/p&gt;</comment>
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