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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>
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<item>
            <title>[SERVER-7417] Invalid access at address: 0 from thread: journal</title>
                <link>https://jira.mongodb.org/browse/SERVER-7417</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Saving new entries on multiple python processes (via pymongo 2.3), and get the error below.  Has happened repeatedly, but not reproducibly.&lt;/p&gt;


&lt;p&gt;Thu Oct 18 13:56:50 &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; connection accepted from 127.0.0.1:46942 #18413 &lt;br/&gt;
(36 connections now open)&lt;br/&gt;
Thu Oct 18 13:56:50 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn18413&amp;#93;&lt;/span&gt; end connection 127.0.0.1:46942 (35 connections now open)&lt;br/&gt;
Thu Oct 18 13:56:50 Invalid access at address: 0 from thread: journal&lt;/p&gt;

&lt;p&gt;Thu Oct 18 13:56:50 Got signal: 11 (Segmentation fault).&lt;/p&gt;

&lt;p&gt;Thu Oct 18 13:56:50 Backtrace:&lt;br/&gt;
0xade6e1 0x5582d9 0x558862 0x7fc0a4db1cb0 0x7fc0a411b0d0 0x583c30 0x5847f8 0x584b8c 0x6228ae 0x622c12 0xa0a30b 0xa0a70c 0xa0ae24 0x7c3659 0x7fc0a4da9e9a 0x7fc0a40bf4bd&lt;br/&gt;
 mongod(_ZN5mongo15printStackTraceERSo+0x21) &lt;span class=&quot;error&quot;&gt;&amp;#91;0xade6e1&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongod(_ZN5mongo10abruptQuitEi+0x399) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x5582d9&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongod(_ZN5mongo24abruptQuitWithAddrSignalEiP7siginfoPv+0x262) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x558862&amp;#93;&lt;/span&gt;&lt;br/&gt;
 /lib/x86_64-linux-gnu/libpthread.so.0(+0xfcb0) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x7fc0a4db1cb0&amp;#93;&lt;/span&gt;&lt;br/&gt;
 /lib/x86_64-linux-gnu/libc.so.6(+0x14e0d0) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x7fc0a411b0d0&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongod(_ZN6snappy8internal16CompressFragmentEPKcmPcPti+0x300) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x583c30&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongod(_ZN6snappy8CompressEPNS_6SourceEPNS_4SinkE+0x158) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x5847f8&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongod(_ZN6snappy11RawCompressEPKcmPcPm+0x5c) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x584b8c&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongod(_ZN5mongo3dur7Journal7journalERKNS0_11JSectHeaderERKNS_14AlignedBuilderE+0xae) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x6228ae&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongod(_ZN5mongo3dur14WRITETOJOURNALENS0_11JSectHeaderERNS_14AlignedBuilderE+0x32) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x622c12&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongod() &lt;span class=&quot;error&quot;&gt;&amp;#91;0xa0a30b&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongod() &lt;span class=&quot;error&quot;&gt;&amp;#91;0xa0a70c&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongod(_ZN5mongo3dur9durThreadEv+0x364) &lt;span class=&quot;error&quot;&gt;&amp;#91;0xa0ae24&amp;#93;&lt;/span&gt;&lt;br/&gt;
 mongod() &lt;span class=&quot;error&quot;&gt;&amp;#91;0x7c3659&amp;#93;&lt;/span&gt;&lt;br/&gt;
 /lib/x86_64-linux-gnu/libpthread.so.0(+0x7e9a) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x7fc0a4da9e9a&amp;#93;&lt;/span&gt;&lt;br/&gt;
 /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x7fc0a40bf4bd&amp;#93;&lt;/span&gt;&lt;/p&gt;</description>
                <environment>Ubuntu 12.04</environment>
        <key id="53635">SERVER-7417</key>
            <summary>Invalid access at address: 0 from thread: journal</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="5">Cannot Reproduce</resolution>
                                        <assignee username="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="bobbyj">Bobby J</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Oct 2012 21:23:53 +0000</created>
                <updated>Fri, 8 Mar 2013 15:56:13 +0000</updated>
                            <resolved>Fri, 9 Nov 2012 15:00:59 +0000</resolved>
                                    <version>2.2.0</version>
                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="187593" author="bobbyj" created="Tue, 13 Nov 2012 08:44:36 +0000"  >&lt;p&gt;Realized that this occurred during an (unrelated) catastrophic failure of the disk it was using.  Given this unique event, I don&apos;t think we&apos;ll be able to reproduce.  Thanks for looking into it.&lt;/p&gt;</comment>
                            <comment id="178385" author="milkie" created="Tue, 23 Oct 2012 21:13:23 +0000"  >&lt;p&gt;Hi Bobby.  Thanks for reporting this issue.&lt;br/&gt;
I&apos;d like to try to reproduce this on my own machine. How often do you experience a crash like this?  Did you have something working okay with a prior version of the server or driver?  Is it possible to get a copy of your Python code used to trigger this problem?&lt;br/&gt;
Can you attach a full log (beginning with server startup) from a crash?  Is there anything special or unusual about your system setup?&lt;/p&gt;

&lt;p&gt;The crash seems to be happening because we&apos;re using a null buffer for the temporary storage that the journaling system uses to compress its redo log.  Since this buffer is static and protected by a mutex, I&apos;m not yet sure how it could be seen as null during normal program execution.&lt;/p&gt;</comment>
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