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8361370: runtime/Thread/TestThreadDumpMonitorContention.java fails due to time out on Windows #26895

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8361370: runtime/Thread/TestThreadDumpMonitorContention.java fails due to time out on Windows #26895

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724868b
8361370: Fixed test timeout on Windows
toxaart Aug 22, 2025
3bed268
8361370: Added explanatory comment.
toxaart Aug 22, 2025
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7 changes: 6 additions & 1 deletion test/hotspot/jtreg/runtime/Thread/TestThreadDumpMonitorContention.java
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,11 @@ public class TestThreadDumpMonitorContention {
// getJDKTool() which can fall back to "compile.jdk".
final static String JSTACK = JDKToolFinder.getTestJDKTool("jstack");
final static String PID = Long.toString(ProcessHandle.current().pid());
// jstack streming output should be disabled because if the attach operation is executed at a safepoint,
// the attach streaming output is enabled and the tool output is lengthy we can get both buffers (the attach
// channel and the tool redirection buffer) full and the test hangs.
// Instead the attach operation output is buffered and is sent after the operation is completed
final static String DISABLE_STREAMING_OUTPUT = "-J-Djdk.attach.allowStreamingOutput=false";

// looking for header lines with these patterns:
// "ContendingThread-1" #19 prio=5 os_prio=64 tid=0x000000000079c000 nid=0x23 runnable [0xffff80ffb8b87000]
Expand Down Expand Up @@ -379,7 +384,7 @@ static void doSamples() throws Exception {
// we don't mix data between the two stack traces that do
// match HEADER_PREFIX_PATTERN.
//
Process process = new ProcessBuilder(JSTACK, PID)
Process process = new ProcessBuilder(JSTACK, DISABLE_STREAMING_OUTPUT, PID)
.redirectErrorStream(true).start();

BufferedReader reader = new BufferedReader(new InputStreamReader(
Expand Down