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8361827: [TESTBUG] serviceability/HeapDump/UnmountedVThreadNativeMethodAtTop.java throws OutOfMemoryError #26278

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8361827: [TESTBUG] serviceability/HeapDump/UnmountedVThreadNativeMethodAtTop.java throws OutOfMemoryError #26278

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e5b2206
Reproduce OOM with duplicate test case
reinrich Jul 11, 2025
e1dec29
Fix issue: System.gc() before each test
reinrich Jul 11, 2025
c97c311
Revert "Reproduce OOM with duplicate test case"
reinrich Jul 11, 2025
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10 changes: 10 additions & 0 deletions test/hotspot/jtreg/serviceability/HeapDump/UnmountedVThreadNativeMethodAtTop.java
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,7 @@
import java.util.concurrent.CountDownLatch;
import com.sun.management.HotSpotDiagnosticMXBean;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;

Expand All @@ -49,6 +50,15 @@ public class UnmountedVThreadNativeMethodAtTop {

boolean done;

/**
* The tests accumulate previous heap dumps. Trigger GC before each test to get rid of them.
* This makes dumps smaller, processing faster, and avoids OOMs
*/
@BeforeEach
void doGC() {
System.gc();
}

/**
* Test dumping the heap while a virtual thread is blocked entering a synchronized native method.
*/
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