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<p><span style="font-family:"Segoe UI",sans-serif;color:#1F2328">Hi,</span><span style="color:black"><o:p></o:p></span></p>
<p style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-family:"Segoe UI",sans-serif;color:#1F2328">I've been investigating the test failures that caused JDK-8346108 (the revert of JDK-8337994 REDO in JDK21). This is related to the native memory leak when not recording any JFR events (JDK-8335121).</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<b><span style="font-size:18.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328"> </span></b><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<b><span style="font-size:18.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">Summary</span></b><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:#1F2328">Based on our investigation, we believe the JDK-8337994 (REDO) backport to JDK21 failed because it appears to depend on API changes introduced in the original JDK-8316241 fix that
were never backported to JDK21. Our theory is that the REDO fix assumes the existence of infrastructure that only exists in later mainline releases.</span><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
<h2 style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-family:"Segoe UI",sans-serif;color:#1F2328"> </span><span style="color:black"><o:p></o:p></span></h2>
<h2 style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-family:"Segoe UI",sans-serif;color:#1F2328">Root Cause Analysis</span><span style="color:black"><o:p></o:p></span></h2>
<h2 style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">The Missing Prerequisite</span><span style="color:black"><o:p></o:p></span></h2>
<p style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-family:"Segoe UI",sans-serif;color:#1F2328">The original JDK-8316241 fix (commit b2a39c576706622b624314c89fa6d10d0b422f86) introduced several key changes to </span><code><span style="font-size:10.0pt;font-family:Menlo;color:#1F2328">jfrTypeSetUtils.hpp/.cpp</span></code><span style="font-family:"Segoe UI",sans-serif;color:#1F2328">:</span><span style="color:black"><o:p></o:p></span></p>
<ol style="margin-top:0in;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px" start="1" type="1">
<li class="MsoNormal" style="color:#1F2328;mso-list:l0 level1 lfo3"><strong><span style="font-family:"Segoe UI",sans-serif">API Change</span></strong><span style="font-family:"Segoe UI",sans-serif">: </span><code><span style="font-size:10.0pt;font-family:Menlo">should_do_loader_klass(const
Klass* k)</span></code><span style="font-family:"Segoe UI",sans-serif"> → </span><code><span style="font-size:10.0pt;font-family:Menlo">should_do_cld_klass(const Klass* k, bool leakp)</span></code><o:p></o:p></li><li class="MsoNormal" style="color:#1F2328;mso-list:l0 level1 lfo3"><strong><span style="font-family:"Segoe UI",sans-serif">New Data Structure</span></strong><span style="font-family:"Segoe UI",sans-serif">: Added </span><code><span style="font-size:10.0pt;font-family:Menlo">_klass_loader_leakp_set</span></code><span style="font-family:"Segoe UI",sans-serif"> for
separate tracking of leakp (leak profiler) path klasses</span><o:p></o:p></li><li class="MsoNormal" style="color:black;mso-list:l0 level1 lfo3"><strong><span style="font-family:"Segoe UI",sans-serif;color:#1F2328">New Function</span></strong><span style="font-family:"Segoe UI",sans-serif;color:#1F2328">: </span><code><span style="font-size:10.0pt;font-family:Menlo;color:#1F2328">get_cld_klass(CldPtr
cld, bool leakp)</span></code><span style="font-family:"Segoe UI",sans-serif;color:#1F2328"> in </span><code><span style="font-size:10.0pt;font-family:Menlo;color:#1F2328">jfrTypeSet.cpp</span></code><span style="font-family:"Segoe UI",sans-serif;color:#1F2328"> that
properly enqueues CLD klasses via </span><code><span style="font-size:10.0pt;font-family:Menlo;color:#1F2328">JfrTraceId::load()</span></code><o:p></o:p></li></ol>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:13.5pt;color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<b><span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:black">What Happens Without These Changes</span></b><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
<p style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-family:"Segoe UI",sans-serif;color:#1F2328">The REDO fix attempts to use </span><code><span style="font-size:10.0pt;font-family:Menlo;color:#1F2328">get_cld_klass()</span></code><span style="font-family:"Segoe UI",sans-serif;color:#1F2328"> which
calls </span><code><span style="font-size:10.0pt;font-family:Menlo;color:#1F2328">should_do_cld_klass(klass, leakp)</span></code><span style="font-family:"Segoe UI",sans-serif;color:#1F2328">, but in the JDK21 backport:</span><span style="color:black"><o:p></o:p></span></p>
<ul style="margin-top:0in;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px" type="disc">
<li class="MsoNormal" style="color:#1F2328;mso-list:l4 level1 lfo6"><span style="font-family:"Segoe UI",sans-serif">JDK21 still has the old API: </span><code><span style="font-size:10.0pt;font-family:Menlo">should_do_loader_klass(const Klass* k)</span></code><span style="font-family:"Segoe UI",sans-serif"> (no
leakp parameter)</span><o:p></o:p></li><li class="MsoNormal" style="color:#1F2328;mso-list:l4 level1 lfo6"><span style="font-family:"Segoe UI",sans-serif">JDK21 lacks </span><code><span style="font-size:10.0pt;font-family:Menlo">_klass_loader_leakp_set</span></code><span style="font-family:"Segoe UI",sans-serif"> for
separate tracking</span><o:p></o:p></li><li class="MsoNormal" style="color:#1F2328;mso-list:l4 level1 lfo6"><span style="font-family:"Segoe UI",sans-serif">The </span><code><span style="font-size:10.0pt;font-family:Menlo">get_cld_klass()</span></code><span style="font-family:"Segoe UI",sans-serif"> function
doesn't exist in the JDK21 codebase</span><o:p></o:p></li></ul>
<p style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;text-align:start;-webkit-text-stroke-width: 0px;margin:1rem;font-variant-ligatures: normal;orphans: 2;widows: 2;text-decoration-thickness: initial;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span style="font-family:"Segoe UI",sans-serif;color:#1F2328">This causes the </span><code><span style="font-size:10.0pt;font-family:Menlo;color:#1F2328">assert(IS_SERIALIZED(class_loader_klass))</span></code><span style="font-family:"Segoe UI",sans-serif;color:#1F2328"> to
fail in </span><code><span style="font-size:10.0pt;font-family:Menlo;color:#1F2328">write_cld()</span></code><span style="font-family:"Segoe UI",sans-serif;color:#1F2328"> because the CLD's class_loader_klass is never properly enqueued for serialization during
the leakp path.</span><span style="color:black"><o:p></o:p></span></p>
<h3 style="mso-margin-top-alt:8.0pt;margin-right:0in;margin-bottom:4.0pt;margin-left:0in;break-after: avoid;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328"> </span><span style="font-size:14.0pt;font-family:"Calibri",sans-serif;color:#2F5496;font-weight:normal"><o:p></o:p></span></h3>
<h3 style="mso-margin-top-alt:8.0pt;margin-right:0in;margin-bottom:4.0pt;margin-left:0in;break-after: avoid;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">Test Failure Mechanism (TestChunkIntegrity.java)</span><span style="font-size:14.0pt;font-family:"Calibri",sans-serif;color:#2F5496;font-weight:normal"><o:p></o:p></span></h3>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">1. TestClassLoader loads MyClass</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">2. Event commits with clazz = MyClass </span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">3. JFR rotation writes MyClass to chunk</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">4. MyClass's CLD references TestClassLoader Klass</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">5. BUG: TestClassLoader Klass not serialized (leakp path broken)</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">6. Chunk written with broken reference</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">7. In slowdebug: assert(IS_SERIALIZED(class_loader_klass)) fails</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">8. In release: "Events don't match" when comparing chunks</span></code><span style="color:black"><o:p></o:p></span></pre>
<h2 style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-family:"Segoe UI",sans-serif;color:#1F2328"> </span><span style="color:black"><o:p></o:p></span></h2>
<h2 style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-family:"Segoe UI",sans-serif;color:#1F2328">The Fix</span><span style="color:black"><o:p></o:p></span></h2>
<h2 style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328;font-weight:normal">I've been able to get a local jdk21 build passing all tests (including slowdebug) by backporting JDK-8316241 and resolving the resulting conflicts. The key changes
are:</span><span style="color:black"><o:p></o:p></span></h2>
<p class="MsoNormal" style="caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<b><span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:#1F2328">1. jfrTypeSetUtils.hpp</span></b><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:10.0pt;font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">// OLD (JDK21 current)</span><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:10.0pt;font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">bool should_do_loader_klass(const Klass* k);</span><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:10.0pt;font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> </span><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:10.0pt;font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">// NEW (with leakp support)</span><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:10.0pt;font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">bool should_do_cld_klass(const Klass* k, bool leakp);</span><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
<h3 style="mso-margin-top-alt:8.0pt;margin-right:0in;margin-bottom:4.0pt;margin-left:0in;break-after: avoid;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:15.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328;font-weight:normal"> </span><span style="font-size:14.0pt;font-family:"Calibri",sans-serif;color:#2F5496;font-weight:normal"><o:p></o:p></span></h3>
<h3 style="mso-margin-top-alt:8.0pt;margin-right:0in;margin-bottom:4.0pt;margin-left:0in;break-after: avoid;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">2. jfrTypeSetUtils.cpp</span><span style="font-size:14.0pt;font-family:"Calibri",sans-serif;color:#2F5496;font-weight:normal"><o:p></o:p></span></h3>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">// Added _klass_loader_leakp_set member</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">GrowableArray<const Klass*>* _klass_loader_leakp_set;</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> </span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">// Updated implementation</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">bool JfrArtifactSet::should_do_cld_klass(const Klass* k, bool leakp) {</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> assert(k != nullptr, "invariant");</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> assert(_klass_loader_set != nullptr, "invariant");</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> assert(_klass_loader_leakp_set != nullptr, "invariant");</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> return not_in_set(leakp ? _klass_loader_leakp_set : _klass_loader_set, k);</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">}</span></code><span style="color:black"><o:p></o:p></span></pre>
<h3 style="mso-margin-top-alt:8.0pt;margin-right:0in;margin-bottom:4.0pt;margin-left:0in;break-after: avoid;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:15.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328;font-weight:normal"> </span><span style="font-size:14.0pt;font-family:"Calibri",sans-serif;color:#2F5496;font-weight:normal"><o:p></o:p></span></h3>
<h3 style="mso-margin-top-alt:8.0pt;margin-right:0in;margin-bottom:4.0pt;margin-left:0in;break-after: avoid;font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<span style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">3. jfrTypeSet.cpp - Added get_cld_klass()</span><span style="font-size:14.0pt;font-family:"Calibri",sans-serif;color:#2F5496;font-weight:normal"><o:p></o:p></span></h3>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">static inline KlassPtr get_cld_klass(CldPtr cld, bool leakp) {</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> if (cld == nullptr) {</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> return nullptr;</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> }</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> assert(leakp ? IS_LEAKP(cld) : used(cld), "invariant");</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> KlassPtr cld_klass = cld->class_loader_klass();</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> if (cld_klass == nullptr) {</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> return nullptr;</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> }</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> if (should_do_cld_klass(cld_klass, leakp)) {</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> if (current_epoch()) {</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> // KEY FIX: Enqueue the klass for serialization</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> JfrTraceId::load(cld_klass);</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> } else {</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> artifact_tag(cld_klass, leakp);</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> }</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> return cld_klass;</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> }</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in"> return nullptr;</span></code><span style="color:black"><o:p></o:p></span></pre>
<pre style="background:#F6F8FA;caret-color: rgb(0, 0, 0);font-variant-caps: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><code><span style="font-family:Menlo;color:#1F2328;border:none windowtext 1.0pt;padding:0in">}</span></code><span style="color:black"><o:p></o:p></span></pre>
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<b><span style="font-size:18.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328"> </span></b><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
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<b><span style="font-size:18.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328"> </span></b><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
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<b><span style="font-size:18.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">Proposed Action</span></b><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
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<span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:#1F2328">Based on this, it appears that backporting JDK-8337994 (REDO) alone may not be sufficient, and that some or all the prerequisite infrastructure changes from JDK-8316241 may also
need to be backported.</span><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
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<span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:#1F2328"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:#1F2328">Additionally, there may be other upstream commits (such as<span class="apple-converted-space"> </span><a href="https://github.com/openjdk/jdk/commit/e2d6023cb9667dc9911e0af421d6dd0c78f6bf58" title="https://github.com/openjdk/jdk/commit/e2d6023cb9667dc9911e0af421d6dd0c78f6bf58">8323631</a>)
in JDK24 that were made on top of JDK-8316241 that could also be required for the fix to not cause other possible errors.
<b><i>We would appreciate guidance on identifying any additional changes that might need to be included in the backport.<span class="apple-converted-space"> </span></i></b></span><b><i><span style="font-size:13.5pt;color:black"><o:p></o:p></span></i></b></p>
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<span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:#1F2328"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:#1F2328">If this direction makes sense, I'm happy to prepare a proper patch for review.</span><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
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<span style="font-family:"Segoe UI",sans-serif;color:#1F2328"> </span><span style="color:black"><o:p></o:p></span></h2>
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<span style="font-family:"Segoe UI",sans-serif;color:#1F2328">References</span><span style="color:black"><o:p></o:p></span></h2>
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<li class="MsoNormal" style="color:#1F2328;mso-list:l3 level1 lfo9"><span style="font-family:"Segoe UI",sans-serif"><a href="https://bugs.openjdk.org/browse/JDK-8335121" title="https://bugs.openjdk.org/browse/JDK-8335121">JDK-8335121</a>: Native memory leak
when JFR is enabled but no events are emitted</span><o:p></o:p></li><li class="MsoNormal" style="color:#1F2328;margin-top:3.0pt;mso-list:l3 level1 lfo9">
<span style="font-family:"Segoe UI",sans-serif"><a href="https://github.com/openjdk/jdk/commit/b2a39c576706622b624314c89fa6d10d0b422f86#diff-e9a35c652aa2e65265e7027d3093298a6c59d2137cbf3fa6a5b25b895d77beb1L73" title="https://github.com/openjdk/jdk/commit/b2a39c576706622b624314c89fa6d10d0b422f86#diff-e9a35c652aa2e65265e7027d3093298a6c59d2137cbf3fa6a5b25b895d77beb1L73">JDK-8316241</a>:
Test jdk/jdk/jfr/jvm/TestChunkIntegrity.java failed (original fix)</span><o:p></o:p></li><li class="MsoNormal" style="color:#1F2328;margin-top:3.0pt;mso-list:l3 level1 lfo9">
<span style="font-family:"Segoe UI",sans-serif"><a href="https://github.com/openjdk/jdk/commit/6a9a867d645b8fe86f4ca2b04a43bf5aa8f9d487" title="https://github.com/openjdk/jdk/commit/6a9a867d645b8fe86f4ca2b04a43bf5aa8f9d487">JDK-8337994</a>: [REDO] Native memory
leak when not recording any events</span><o:p></o:p></li><li class="MsoNormal" style="color:#1F2328;margin-top:3.0pt;mso-list:l3 level1 lfo9">
<span style="font-family:"Segoe UI",sans-serif"><a href="https://bugs.openjdk.org/browse/JDK-8346108" title="https://bugs.openjdk.org/browse/JDK-8346108">JDK-8346108</a>: Revert of REDO in JDK21u due to test failures</span><o:p></o:p></li></ul>
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<span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:#1F2328"> </span><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
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<span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:#1F2328"> </span><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
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<span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:#1F2328">Best Regards,<span class="apple-converted-space"> </span></span><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
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<span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:#1F2328">Ozan</span><span style="font-size:13.5pt;color:black"><o:p></o:p></span></p>
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