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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-33125] Segfault caused by apparent error in codegen for exception unwinding on s390x</title>
                <link>https://jira.mongodb.org/browse/SERVER-33125</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On s390x, when &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c6d77332363ca7ba7913c0c3eba0527e3f367c92/src/mongo/db/pipeline/parsed_aggregation_projection.cpp#L180&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this call to parseElement&lt;/a&gt; results in an exception, exception unwinding triggers a call to the FieldPath destructor, but that destructor gets called on address 0x0. Inspection of the disassembly reveals that the exception unwinding code is incorrectly attempting to read the address of the FieldPath object from a volatile (caller-save) register, which has been clobbered with a 0 value.&lt;/p&gt;

&lt;p&gt;As a workaround, we can assign the FieldPath to a named variable, instead of constructing it within the argument list to ProjectTypeParser::parseElement().&lt;/p&gt;</description>
                <environment></environment>
        <key id="492558">SERVER-33125</key>
            <summary>Segfault caused by apparent error in codegen for exception unwinding on s390x</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="13201">Fixed</resolution>
                                        <assignee username="justin.seyster@mongodb.com">Justin Seyster</assignee>
                                    <reporter username="justin.seyster@mongodb.com">Justin Seyster</reporter>
                        <labels>
                    </labels>
                <created>Mon, 5 Feb 2018 16:45:18 +0000</created>
                <updated>Mon, 8 Jan 2024 15:22:59 +0000</updated>
                            <resolved>Fri, 9 Feb 2018 18:33:44 +0000</resolved>
                                                    <fixVersion>3.7.2</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2065597" author="xgen-internal-githook" created="Sat, 17 Nov 2018 16:33:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Morrow&apos;, &apos;email&apos;: &apos;acm@mongodb.com&apos;, &apos;username&apos;: &apos;acmorrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34873&quot; title=&quot;Fix problems caused by unwind handling on Z Series.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34873&quot;&gt;&lt;del&gt;SERVER-34873&lt;/del&gt;&lt;/a&gt; Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33125&quot; title=&quot;Segfault caused by apparent error in codegen for exception unwinding on s390x&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33125&quot;&gt;&lt;del&gt;SERVER-33125&lt;/del&gt;&lt;/a&gt; Work around codegen error in s390x exception unwinding.&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 85b39d411987431a8c37b1de267b167a384ea9b3.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c5f382a9aae82c2e87362fb0da3cc1d08e9edbb5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c5f382a9aae82c2e87362fb0da3cc1d08e9edbb5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1801190" author="xgen-internal-githook" created="Fri, 9 Feb 2018 18:30:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;justin.seyster@mongodb.com&apos;, &apos;name&apos;: &apos;Justin Seyster&apos;, &apos;username&apos;: &apos;jseyster&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33125&quot; title=&quot;Segfault caused by apparent error in codegen for exception unwinding on s390x&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33125&quot;&gt;&lt;del&gt;SERVER-33125&lt;/del&gt;&lt;/a&gt; Work around codegen error in s390x exception unwinding.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/85b39d411987431a8c37b1de267b167a384ea9b3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/85b39d411987431a8c37b1de267b167a384ea9b3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1798892" author="justin.seyster" created="Wed, 7 Feb 2018 23:35:50 +0000"  >&lt;p&gt;While investigating the workaround for this crasher, I realized I made a mistake in my initial diagnosis. I misread the standard, and the register I thought is volatile (r7) is actually saved (callee-save). That means that the code that the ~FieldPath call site is actually correct in expecting r7 to still hold the address to the FieldPath it wants to destroy.&lt;/p&gt;

&lt;p&gt;I observed where on the stack ProjectTypeParser::parseElememt() saved the value of r7 and set a watchpoint, which allowed me to confirm that the value is actually getting clobbered on the stack. That of course opens up the possibility that the clobbering is because of a code error, but whatever is doing the clobbering is part of the exception unwinding machinery. Unfortunately, I don&apos;t know nearly enough about exception unwinding to understand what went wrong. I still suspect a codegen error, because the crash only occurs on s390x, ASAN does not find any memory corruption, and seemingly insignificant code changes cause the crash to go away.&lt;/p&gt;

&lt;p&gt;For reference, here is the top of the backtrace for the write that clobbers the saved value for r7:&lt;/p&gt;


&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;
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						&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;Old value = (mongo::FieldPath *) 0x3ffca97b0a0&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;New value = (mongo::FieldPath *) 0x0&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;0x000003fffdc077c8 in _Unwind_SetGR () from /lib64/libgcc_s.so.1&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;(gdb) bt&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;#0  0x000003fffdc077c8 in _Unwind_SetGR () from /lib64/libgcc_s.so.1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&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;   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;#1  0x000002aa02383224 in __cxxabiv1::__gxx_personality_v0 (version=&amp;lt;optimized out&amp;gt;, actions=&amp;lt;optimized out&amp;gt;, exception_class=&amp;lt;optimized out&amp;gt;, ue_header=0x2aa07af32d8, context=0x3ffca97ac08) at ../../../../gcc-5.4.0/libstdc++-v3/libsupc++/eh_personality.cc:715&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;#2  0x000003fffdc09c84 in ?? () from /lib64/libgcc_s.so.1&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;#3  0x000003fffdc0a274 in _Unwind_Resume () from /lib64/libgcc_s.so.1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&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;   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;#4  0x000002aa01ae007a in ~intrusive_ptr (this=&amp;lt;optimized out&amp;gt;, __in_chrg=&amp;lt;optimized out&amp;gt;) at src/third_party/boost-1.60.0/boost/smart_ptr/intrusive_ptr.hpp:97&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;#5  ~SharedBuffer (this=&amp;lt;optimized out&amp;gt;, __in_chrg=&amp;lt;optimized out&amp;gt;) at src/mongo/util/shared_buffer.h:42&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;#6  ~SharedBufferAllocator (this=&amp;lt;optimized out&amp;gt;, __in_chrg=&amp;lt;optimized out&amp;gt;) at src/mongo/bson/util/builder.h:79&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;#7  ~_BufBuilder (this=&amp;lt;optimized out&amp;gt;, __in_chrg=&amp;lt;optimized out&amp;gt;) at src/mongo/bson/util/builder.h:157&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;#8  ~StringBuilderImpl (this=&amp;lt;optimized out&amp;gt;, __in_chrg=&amp;lt;optimized out&amp;gt;) at src/mongo/bson/util/builder.h:385&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;#9  ~stream (this=&amp;lt;optimized out&amp;gt;, __in_chrg=&amp;lt;optimized out&amp;gt;) at src/mongo/util/mongoutils/str.h:57&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;#10 operator() (__closure=&amp;lt;optimized out&amp;gt;) at src/mongo/db/pipeline/parsed_aggregation_projection.cpp:232&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;#11 mongo::parsed_aggregation_projection::(anonymous namespace)::ProjectTypeParser::parseElement (this=0x2aa01e2d948 &amp;lt;std::vector&amp;lt;unsigned long, std::allocator&amp;lt;unsigned long&amp;gt; &amp;gt;::_M_emplace_back_aux&amp;lt;unsigned long&amp;gt;(unsigned long&amp;amp;&amp;amp;)+152&amp;gt;, elem=..., pathToElem=...)&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;    at src/mongo/db/pipeline/parsed_aggregation_projection.cpp:232&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;#12 0x000002aa01ae150e in parse (this=0x3ffca97b070) at src/mongo/db/pipeline/parsed_aggregation_projection.cpp:180&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;#13 parse (spec=...) at src/mongo/db/pipeline/parsed_aggregation_projection.cpp:165&lt;/span&gt;&lt;/pre&gt;
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					&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;#14 mongo::parsed_aggregation_projection::ParsedAggregationProjection::create (expCtx=..., spec=...) at src/mongo/db/pipeline/parsed_aggregation_projection.cpp:291&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</comment>
                    </comments>
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