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    <link>https://jira.mongodb.org</link>
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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-42470] Generate additional configuration for libunwind</title>
                <link>https://jira.mongodb.org/browse/SERVER-42470</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Right now we only generate the x86_64 linux variant, but we need the other linux variants as well.&lt;/p&gt;</description>
                <environment></environment>
        <key id="878139">SERVER-42470</key>
            <summary>Generate additional configuration for libunwind</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="daniel.moody@mongodb.com">Daniel Moody</assignee>
                                    <reporter username="andrew.morrow@mongodb.com">Andrew Morrow</reporter>
                        <labels>
                    </labels>
                <created>Mon, 29 Jul 2019 14:16:07 +0000</created>
                <updated>Sun, 29 Oct 2023 22:18:40 +0000</updated>
                            <resolved>Sat, 12 Mar 2022 05:43:27 +0000</resolved>
                                                    <fixVersion>5.3.0-rc4</fixVersion>
                    <fixVersion>5.0.9</fixVersion>
                    <fixVersion>4.4.15</fixVersion>
                                    <component>Build</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4555491" author="xgen-internal-githook" created="Wed, 18 May 2022 06:19:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Daniel Moody&apos;, &apos;email&apos;: &apos;daniel.moody@mongodb.com&apos;, &apos;username&apos;: &apos;dmoody256&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61856&quot; title=&quot;Upgrade libunwind to 1.6.2+&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61856&quot;&gt;&lt;del&gt;SERVER-61856&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42470&quot; title=&quot;Generate additional configuration for libunwind&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42470&quot;&gt;&lt;del&gt;SERVER-42470&lt;/del&gt;&lt;/a&gt; update libunwind to 1.6.2&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 6dd404e028547a29c21b047c2d91ed90ebb1edfb)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b0475e2657c3351b25499971d3340f054ea85b98&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b0475e2657c3351b25499971d3340f054ea85b98&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4555421" author="xgen-internal-githook" created="Wed, 18 May 2022 05:23:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Daniel Moody&apos;, &apos;email&apos;: &apos;daniel.moody@mongodb.com&apos;, &apos;username&apos;: &apos;dmoody256&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61856&quot; title=&quot;Upgrade libunwind to 1.6.2+&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61856&quot;&gt;&lt;del&gt;SERVER-61856&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42470&quot; title=&quot;Generate additional configuration for libunwind&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42470&quot;&gt;&lt;del&gt;SERVER-42470&lt;/del&gt;&lt;/a&gt; update libunwind to 1.6.2&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 6dd404e028547a29c21b047c2d91ed90ebb1edfb)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1a5a5989af161da4baf52ef57e7218b7a42a675a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1a5a5989af161da4baf52ef57e7218b7a42a675a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4408204" author="xgen-internal-githook" created="Sat, 12 Mar 2022 05:00:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Daniel Moody&apos;, &apos;email&apos;: &apos;daniel.moody@mongodb.com&apos;, &apos;username&apos;: &apos;dmoody256&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61856&quot; title=&quot;Upgrade libunwind to 1.6.2+&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61856&quot;&gt;&lt;del&gt;SERVER-61856&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42470&quot; title=&quot;Generate additional configuration for libunwind&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42470&quot;&gt;&lt;del&gt;SERVER-42470&lt;/del&gt;&lt;/a&gt; update libunwind to 1.6.2&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6dd404e028547a29c21b047c2d91ed90ebb1edfb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6dd404e028547a29c21b047c2d91ed90ebb1edfb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2722876" author="billy.donahue" created="Mon, 13 Jan 2020 20:26:21 +0000"  >&lt;p&gt;With&#160;22f1d428ec3415fc4ee792eda9ac63b9d451b7d9, we have a build of libunwind for aarch64.&lt;br/&gt;
But `--use-libunwind` should not be used.&lt;/p&gt;

&lt;p&gt;Mongod hits a SIGSEGV while unwinding certain stacks (inside SIGUSR2 handlers).&lt;br/&gt;
The stacktrace_test also hits this. It seems to be a flaw in libunwind&apos;s `dwarf/Gparser.c`.&lt;br/&gt;
OR it&apos;s a flaw in our generated dwarf under GCC. Either way, we can&apos;t use it and can&apos;t fix it directly.&lt;/p&gt;

&lt;p&gt;We see this behavior even with `--use-system-libunwind`, so it&apos;s not just our customized SConscript build of libunwind that&apos;s showing the problem.&lt;/p&gt;

&lt;p&gt;We could probably learn more by running libunwind&apos;s self-tests.&lt;/p&gt;</comment>
                            <comment id="2722704" author="xgen-internal-githook" created="Mon, 13 Jan 2020 19:20:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42470&quot; title=&quot;Generate additional configuration for libunwind&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42470&quot;&gt;&lt;del&gt;SERVER-42470&lt;/del&gt;&lt;/a&gt; libunwind linux_aarch64 SConstruct and config artifacts&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/22f1d428ec3415fc4ee792eda9ac63b9d451b7d9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/22f1d428ec3415fc4ee792eda9ac63b9d451b7d9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2719586" author="xgen-internal-githook" created="Fri, 10 Jan 2020 21:47:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42470&quot; title=&quot;Generate additional configuration for libunwind&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42470&quot;&gt;&lt;del&gt;SERVER-42470&lt;/del&gt;&lt;/a&gt; update libunwind to get mongo-local _&lt;em&gt;asm&lt;/em&gt;_ patch&lt;/p&gt;

&lt;p&gt;import to new v1.4-stable-mongo tag&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bd8267ebcee61a9c131a931dbb7031f85dc6cd67&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bd8267ebcee61a9c131a931dbb7031f85dc6cd67&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2715537" author="billy.donahue" created="Thu, 9 Jan 2020 22:56:16 +0000"  >&lt;p&gt;I was able to build mongod on aarch64 with libunwind enabled.&lt;br/&gt;
 When I send it a SIGUSR2, I get a crash inside `unw_backtrace()`, as it parses dwarf data.&lt;br/&gt;
 Filed an upstream bug about it.[&lt;br/&gt;
 &lt;a href=&quot;https://github.com/libunwind/libunwind/issues/150&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/libunwind/libunwind/issues/150&lt;/a&gt;&lt;br/&gt;
 ]&lt;/p&gt;

&lt;p&gt;libunwind on aarch64 might not be feasible.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Effort so far:&lt;/p&gt;

&lt;p&gt;&#160; &#160; &lt;a href=&quot;http://mongodbcr.appspot.com/546740270&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://mongodbcr.appspot.com/546740270&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2714811" author="billy.donahue" created="Thu, 9 Jan 2020 18:35:56 +0000"  >&lt;p&gt;Needs a small patch to the aarch64 code, which uses asm instead of _&lt;em&gt;asm&lt;/em&gt;_, which is incompatible with mongo scons&apos; -std:c11.&lt;br/&gt;
 Working on upstreaming from the mongodb-forks/libunwind repo.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/libunwind/libunwind/pull/149&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/libunwind/libunwind/pull/149&lt;/a&gt;&lt;/p&gt;</comment>
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