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Fix deadlock in dd-task-scheduler #10096

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Merged
rkennke merged 12 commits into from
Dec 11, 2025
Merged

Fix deadlock in dd-task-scheduler #10096

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306201e
[PROF-13025] Fix deadlock in dd-task-scheduler
rkennke Dec 8, 2025
6bdc537
Load class using ClassLoader
rkennke Dec 8, 2025
501bb1b
Merge branch 'master' into PROF-13025
rkennke Dec 9, 2025
68f4a31
Load Handlers class before initializing JMX
rkennke Dec 9, 2025
d9bb39f
Merge remote-tracking branch 'origin/PROF-13025' into PROF-13025
rkennke Dec 9, 2025
3e11771
Merge remote-tracking branch 'origin/master' into PROF-13025
rkennke Dec 9, 2025
46a956d
Use AGENT_CLASSLOADER directly
rkennke Dec 9, 2025
5510b08
Merge branch 'master' into PROF-13025
rkennke Dec 9, 2025
e5ac639
Move load of Handlers into registerSmapEntryEvent()
rkennke Dec 9, 2025
d44266e
Merge branch 'master' into PROF-13025
rkennke Dec 10, 2025
076a11c
Replace internal Jira ref with JBS bug issue
rkennke Dec 10, 2025
99ec036
Merge branch 'master' into PROF-13025
rkennke Dec 10, 2025
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9 changes: 9 additions & 0 deletions dd-java-agent/agent-bootstrap/src/main/java/datadog/trace/bootstrap/Agent.java
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Original file line number Diff line number Diff line change
Expand Up @@ -924,6 +924,15 @@ private static synchronized void registerDeadlockDetectionEvent() {

private static synchronized void registerSmapEntryEvent() {
log.debug("Initializing smap entry scraping");

// Load JFR Handlers class early, if present (it has been moved and renamed in JDK23+).
// This prevents a deadlock. See https://bugs.openjdk.org/browse/JDK-8371889.
try {
AGENT_CLASSLOADER.loadClass("jdk.jfr.events.Handlers");
} catch (Exception e) {
// Ignore when the class is not found or anything else goes wrong.
}

try {
final Class<?> smapFactoryClass =
AGENT_CLASSLOADER.loadClass(
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