From 3f01d03a10cb3f647735ed4bbea1768ff18bf8f2 Mon Sep 17 00:00:00 2001
From: Lin Zang <lzang@openjdk.org>
Date: Mon, 11 Oct 2021 15:27:28 +0000
Subject: [PATCH] 8275021: Test serviceability/sa/TestJmapCore.java fails with:
 java.io.IOException: Stack frame 0x4 not found

Reviewed-by: dholmes, dcubed
---
 .../classes/sun/jvm/hotspot/utilities/HeapHprofBinWriter.java   | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/utilities/HeapHprofBinWriter.java b/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/utilities/HeapHprofBinWriter.java
index c8afa4c1b2d..75f27fa5d73 100644
--- a/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/utilities/HeapHprofBinWriter.java
+++ b/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/utilities/HeapHprofBinWriter.java
@@ -615,6 +615,8 @@ public class HeapHprofBinWriter extends AbstractHeapGraphWriter {
         } else {
             out.writeByte((byte)HPROF_HEAP_DUMP);
             out.writeInt(0);
+            // We must flush all data to the file before reading the current file position.
+            out.flush();
             // record the current position in file, it will be use for calculating the size of written data
             currentSegmentStart = fos.getChannel().position();
             // write dummy zero for length