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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-17359] Uncaught alloc Exception in Snappy on Windows</title>
                <link>https://jira.mongodb.org/browse/SERVER-17359</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;snappy.cc could throw an exception if an allocation for a char array fails in the function &quot;Compress&quot;. This exception is not caught.&lt;/p&gt;

&lt;p&gt;There&apos;s a code review for a different change that affects this line of code but does not address this issue. &lt;br/&gt;
link to CR here: &lt;a href=&quot;http://codereview.10gen.com/6078463630901248/patch/5629499534213120/5066549580791808&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://codereview.10gen.com/6078463630901248/patch/5629499534213120/5066549580791808&lt;/a&gt;&lt;br/&gt;
link to SERVER ticket here: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17299&quot; title=&quot;Extraneous memory allocations in snappy hurt WiredTiger performance on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17299&quot;&gt;&lt;del&gt;SERVER-17299&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This only affects Windows since other OSes don&apos;t use this function.&lt;/p&gt;

&lt;p&gt;mongod log is attached in the comments&lt;/p&gt;</description>
                <environment>Windows Server 2012 R2</environment>
        <key id="185815">SERVER-17359</key>
            <summary>Uncaught alloc Exception in Snappy on Windows</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="michael.cahill@mongodb.com">Michael Cahill</assignee>
                                    <reporter username="robert.guo@mongodb.com">Robert Guo</reporter>
                        <labels>
                            <label>28qa</label>
                    </labels>
                <created>Mon, 23 Feb 2015 23:56:26 +0000</created>
                <updated>Mon, 27 Apr 2015 20:53:01 +0000</updated>
                            <resolved>Tue, 24 Feb 2015 00:50:22 +0000</resolved>
                                    <version>3.0.0-rc9</version>
                                                    <component>Storage</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="835467" author="michael.cahill" created="Tue, 24 Feb 2015 00:50:22 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=robert.guo&quot; class=&quot;user-hover&quot; rel=&quot;robert.guo&quot;&gt;robert.guo&lt;/a&gt;, this is a real issue, but it can&apos;t be fixed in WiredTiger: we are calling a C API, it shouldn&apos;t throw exceptions.  Can you follow up with the snappy maintainers to have them address this?  Thanks.&lt;/p&gt;</comment>
                            <comment id="835459" author="michael.cahill" created="Tue, 24 Feb 2015 00:44:23 +0000"  >&lt;p&gt;The only place where that exception can reasonably be caught is in the &lt;tt&gt;snappy_compress&lt;/tt&gt; function in the C API for snappy that WiredTiger uses.  We could make that change in MongoDB&apos;s copy of the Snappy code, but this issue would really be better addressed to the snappy maintainers:&lt;/p&gt;

&lt;p&gt;  &lt;a href=&quot;https://code.google.com/p/snappy/issues/list&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://code.google.com/p/snappy/issues/list&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;manually throw a std::bad_alloc() in place of &lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;around line 945 in snappy.cc. &lt;/p&gt;

&lt;p&gt;We may need to keep a counter to only throw after 50 or so calls, otherwise WT won&apos;t start.&lt;/p&gt;</customfieldvalue>

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