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<h1><strong>Analyzing .NET memory dumps</strong></h1>
<h3>Vasile Bujac</h3>
<p>Software Engineer</p>
<p><img src="slides/uipath-logo.svg" alt="height:48px" style="height:48px;" /></p>
</section>
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<h2><strong>What helps?</strong></h2>
<ul>
<li>Basic knowledge of CLR internals</li>
<li>How TPL and <code>async/await</code> works</li>
<li>Knowing how to read and debug someone else's code</li>
<li>An inquisitive mind</li>
</ul>
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<h2><strong>What kind of issues can I investigate?</strong></h2>
<ul>
<li><img class="emoji" draggable="false" alt="✅" src="https://twemoji.maxcdn.com/2/svg/2705.svg" data-marp-twemoji=""/> App is leaking memory</li>
<li><img class="emoji" draggable="false" alt="✅" src="https://twemoji.maxcdn.com/2/svg/2705.svg" data-marp-twemoji=""/> App is spawning lots of threads / handles</li>
<li><img class="emoji" draggable="false" alt="✅" src="https://twemoji.maxcdn.com/2/svg/2705.svg" data-marp-twemoji=""/> Crashes or app not responding</li>
<li><img class="emoji" draggable="false" alt="❔" src="https://twemoji.maxcdn.com/2/svg/2754.svg" data-marp-twemoji=""/> Increased CPU consumption</li>
<li><img class="emoji" draggable="false" alt="❔" src="https://twemoji.maxcdn.com/2/svg/2754.svg" data-marp-twemoji=""/> App is slow</li>
<li><img class="emoji" draggable="false" alt="⛔️" src="https://twemoji.maxcdn.com/2/svg/26d4.svg" data-marp-twemoji=""/> Analyzing algorithm complexity</li>
</ul>
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<h2><strong>Get the tools</strong></h2>
<ul>
<li><a href="https://www.microsoft.com/store/p/windbg/9pgjgd53tn86"><strong>WinDbg Preview</strong> Windows store app</a></li>
<li><a href="https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/debugger-download-tools">Debugging Tools for Windows 10</a></li>
<li><a href="https://docs.microsoft.com/en-us/sysinternals/downloads/sysinternals-suite"><strong>ProcDump</strong> (Sysinternals suite)</a></li>
<li><a href="https://github.com/microsoft/perfview/releases"><strong>Perfview</strong></a></li>
<li><a href="https://github.com/rodneyviana/netext"><strong>NetExt</strong> debugging extension for WinDbg</a></li>
<li><a href="https://www.microsoft.com/en-us/download/details.aspx?id=53304"><strong>Mex</strong> debugging extension for WinDbg</a></li>
<li><strong><code>dotnet tool install -g dotnet-dump</code></strong></li>
<li><strong><code>dotnet tool install -g dotnet-gcdump</code></strong></li>
</ul>
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</section>
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<h2><strong>Collect a memory dump</strong></h2>
<ul>
<li><strong><code>procdump.exe -ma -g -e 1 -f C00000FD.STACK_OVERFLOW <pid></code></strong></li>
<li><strong><code>dotnet dump collect -p <pid></code></strong> (Linux, Windows)</li>
<li><strong><code>dotnet gcdump collect -p <pid></code></strong>, not an actual memory dump</li>
</ul>
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<h2><strong>Set up symbols</strong></h2>
<ul>
<li><strong><code>_NT_SYMBOL_PATH</code></strong> environment variable</li>
<li><strong><code>.sympath cache*c:\symbols;srv*https://msdl.microsoft.com/download/symbols</code></strong></li>
<li><strong><code>!ld*</code></strong> to load all module symbols</li>
</ul>
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<h2><strong>Loading SOS and other WinDbg extensions</strong></h2>
<p>The runtime versions and bitness must match</p>
<ul>
<li><strong><code>.loadby sos clr</code></strong> for local .NET Framework SOS</li>
<li><strong><code>.loadby sos coreclr</code></strong> for local .NET Core SOS</li>
<li><strong><code>.cordll -l -ve</code></strong> can automatically load the <em>correct</em> SOS version from Microsoft's public sumbols servers</li>
<li><strong><code>!analyze</code></strong></li>
<li><strong><code>.load <path/to/sos.dll></code></strong> for loading a particular version of SOS.dll</li>
<li><strong><code>.load <path/to/x64/netext.dll></code></strong> for loading extensions</li>
</ul>
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<h2><strong>Where to look first?</strong></h2>
<ul>
<li>Threads & stacks</li>
<li>Exceptions</li>
<li>Heap and object stats</li>
<li>Locks</li>
</ul>
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<h2><strong>App is slow, has crashed or not responding</strong></h2>
<table>
<thead>
<tr>
<th style="text-align:left">Command</th>
<th style="text-align:left">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left"><strong><code>![w|m]threads</code></strong></td>
<td style="text-align:left">List managed threads, <code>-live</code> to display live threads only</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!threadpool</code></strong></td>
<td style="text-align:left">Basic information about thread pool</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>![w]clrstack</code></strong></td>
<td style="text-align:left">Dump current thread CLR stack</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>~*e![w]clrstack</code></strong></td>
<td style="text-align:left">Dumps all managed thread stacks</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!eestack [-short] [-ee]</code></strong></td>
<td style="text-align:left">Runs <code>!DumpStack</code> on all threads in the process</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!wk</code></strong></td>
<td style="text-align:left">(NetExt) Dump stacks in mixed mode (native/managed)</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!dso</code></strong> or <strong><code>!wstack</code></strong></td>
<td style="text-align:left">Dump (unique) stack objects</td>
</tr>
</tbody>
</table>
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<h2><strong>App is leaking memory</strong></h2>
<table>
<thead>
<tr>
<th style="text-align:left">Command</th>
<th style="text-align:left">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left"><strong><code>!dumpheap</code></strong></td>
<td style="text-align:left">Powerful command that traverses the garbage collected heap.With it's various options, it can look for particular types, restrict to a range, or look for ThinLocks</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!eeheap</code></strong></td>
<td style="text-align:left">Enumerates process memory consumed by internal CLR data structures</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!heapstat</code></strong></td>
<td style="text-align:left">Shows the generation sizes for each heap and the total, how much free space there is in each generation on each heap</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!gcroot</code></strong></td>
<td style="text-align:left">Looks for references (or roots) to an object</td>
</tr>
</tbody>
</table>
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<h2><strong>Troubleshooting issues</strong></h2>
<table>
<thead>
<tr>
<th style="text-align:left">Command</th>
<th style="text-align:left">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left"><strong><code>!pe</code></strong> or <strong><code>!wpe</code></strong></td>
<td style="text-align:left">Prints current exception</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!wdae</code></strong></td>
<td style="text-align:left">(NetExt) Shows all exceptions in heap grouped by stacktraces</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!dae</code></strong></td>
<td style="text-align:left">(Mex) Shows all exceptions in heap grouped by stacktraces</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!syncblk</code></strong></td>
<td style="text-align:left">Useful for investigating locking issues (deadlocks, lock contention)</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!finalizequeue</code></strong></td>
<td style="text-align:left">Finalizer queue</td>
</tr>
</tbody>
</table>
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<h2><strong>Viewing <code>.gcdump</code> files with PerfView</strong></h2>
<p>View <strong><code>dotnet gcdump collect</code></strong> output or extract a <code>.gcdump</code> file from a memory dump<br />
<br /><br />
<img src="slides/perfview-gcdump.png" alt="" /></p>
<footer>Analyzing .NET memory dumps</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="13" data-paginate="true" data-footer="Analyzing .NET memory dumps" data-marpit-pagination="13" data-marpit-pagination-total="18" style="--paginate:true;--footer:Analyzing .NET memory dumps;">
<h2><strong>Debugging async task chains</strong></h2>
<ul>
<li><strong><code>!dumpasync</code></strong> is only available on .NET Core debugging tools</li>
<li>For .NET Framework, <code>SosThreadingTools</code> is an extension with limited functionality</li>
<li>NetExt <strong><code>!wfrom</code></strong> can also be used to some degree</li>
</ul>
<footer>Analyzing .NET memory dumps</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-footer="Analyzing .NET memory dumps" data-marpit-pagination="14" data-marpit-pagination-total="18" style="--paginate:true;--footer:Analyzing .NET memory dumps;" data-marpit-advanced-background="background"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("slides/dump-async.png");background-size:contain;"></figure></div></section></foreignObject><foreignObject width="1280" height="720"><section id="14" data-paginate="true" data-footer="Analyzing .NET memory dumps" data-marpit-pagination="14" data-marpit-pagination-total="18" style="--paginate:true;--footer:Analyzing .NET memory dumps;" data-marpit-advanced-background="content"><footer>Analyzing .NET memory dumps</footer>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo" data-marpit-pagination="14" data-marpit-pagination-total="18"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="15" data-paginate="true" data-footer="Analyzing .NET memory dumps" data-marpit-pagination="15" data-marpit-pagination-total="18" style="--paginate:true;--footer:Analyzing .NET memory dumps;">
<h2><strong>Mex debugging extension</strong></h2>
<table>
<thead>
<tr>
<th style="text-align:left">Command</th>
<th style="text-align:left">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left"><strong><code>!mthreads</code></strong></td>
<td style="text-align:left">Dumps all threads and display what they're doing</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!aspxpagesext</code></strong></td>
<td style="text-align:left">Dump all <a href="http://ASP.NET">ASP.NET</a> requests</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!sqlcmd</code></strong></td>
<td style="text-align:left">Provides information about <a href="http://ADO.NET">ADO.NET</a> Commands to SQL Server</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!sqlcn</code></strong></td>
<td style="text-align:left">Provides an overview of <a href="http://ADO.NET">ADO.NET</a> connections to SQL Server</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!dae</code></strong></td>
<td style="text-align:left">Dump all exceptions in heap</td>
</tr>
</tbody>
</table>
<footer>Analyzing .NET memory dumps</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="16" data-paginate="true" data-footer="Analyzing .NET memory dumps" data-marpit-pagination="16" data-marpit-pagination-total="18" style="--paginate:true;--footer:Analyzing .NET memory dumps;">
<h2><strong>NetExt is great</strong></h2>
<table>
<thead>
<tr>
<th style="text-align:left">Command</th>
<th style="text-align:left">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left"><strong><code>!wfrom</code></strong></td>
<td style="text-align:left">Perform SQL-like analysis of Heap objects enabling comparison, expression evaluation and indexed filtering.</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!whttp</code></strong></td>
<td style="text-align:left">Lists HttpContext Objects</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!wruntime</code></strong></td>
<td style="text-align:left">Display HTTP Runtime Info including Active Requests</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!wservice</code></strong></td>
<td style="text-align:left">List WCF service Objects</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!wsocket </code></strong></td>
<td style="text-align:left">Dump socket information</td>
</tr>
<tr>
<td style="text-align:left"><strong><code>!wsql</code></strong></td>
<td style="text-align:left">List SQL queries</td>
</tr>
</tbody>
</table>
<footer>Analyzing .NET memory dumps</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="17" data-paginate="true" data-footer="Analyzing .NET memory dumps" data-marpit-pagination="17" data-marpit-pagination-total="18" style="--paginate:true;--footer:Analyzing .NET memory dumps;">
<h2><strong>Finding objects with !wfrom</strong></h2>
<p>Listing <a href="http://ASP.NET">ASP.NET</a> Core requests (Kestrel)</p>
<pre><code><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>!wfrom -nofield -nospace -implement *.Http1Connection
select
<span class="hljs-constructor">$addr()</span>, <span class="hljs-string">" "</span>,
<span class="hljs-constructor">$rpad($<span class="hljs-params">enumname</span>(<span class="hljs-params">_requestProcessingStatus</span>)</span>, <span class="hljs-number">12</span>),
<span class="hljs-constructor">$rpad($<span class="hljs-params">stackroot</span>($<span class="hljs-params">addr</span>()</span>), <span class="hljs-number">10</span>), <span class="hljs-string">" "</span>,
_statusCode, <span class="hljs-string">" "</span>,
<span class="hljs-constructor">$isnull(<span class="hljs-params">_methodText</span>, <span class="hljs-string">""</span>)</span>, <span class="hljs-string">" "</span>,
<span class="hljs-constructor">$isnull(<span class="hljs-params">_RawTarget_k__BackingField</span>, <span class="hljs-string">"<unavailable>"</span>)</span>
</span></span></foreignObject></svg></code></pre>
<footer>Analyzing .NET memory dumps</footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="18" data-paginate="true" data-footer="Analyzing .NET memory dumps" data-marpit-pagination="18" data-marpit-pagination-total="18" style="--paginate:true;--footer:Analyzing .NET memory dumps;">
<h2><strong>ClrMd</strong></h2>
<p><code>Microsoft.Diagnostics.Runtime</code> is a set of APIs for introspecting processes and dumps.</p>
<ul>
<li>Write your own diagnostics tools or WinDbg extension</li>
<li>Can attach to a live process or load a memory dump</li>
</ul>
<pre><code class="language-csharp"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-keyword">var</span> dt = DataTarget.LoadDump(<span class="hljs-string">@"path\to\memory\dump.dmp"</span>);
<span class="hljs-keyword">var</span> clrRuntime = dt.ClrVersions[<span class="hljs-number">0</span>].CreateRuntime();
<span class="hljs-keyword">var</span> duplicateStrings = clrRuntime.Heap.EnumerateObjects()
.Where(x => x.Type == clrRuntime.Heap.StringType)
.Select(x => (Value: x.AsString(), x.Size))
.GroupBy(x => x.Value)
.Select(x => (Value: x.Key, Count: x.Count(), Size: x.Sum(a => (<span class="hljs-keyword">long</span>)a.Size)))
.Where(x => x.Count > <span class="hljs-number">1</span>)
.OrderByDescending(x => x.Size);
</span></span></foreignObject></svg></code></pre>
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</section>
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