Bug 2229269 - Backport JDK-8243210 [NEEDINFO]
Summary: Backport JDK-8243210
Keywords:
Status: POST
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: java-11-openjdk
Version: 8.4
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Thomas Stuefe
QA Contact: OpenJDK QA
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2023-08-04 16:45 UTC by Mike Millson
Modified: 2023-08-09 03:59 UTC (History)
2 users (show)

Fixed In Version:
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Clone Of:
Environment:
Last Closed:
Type: Bug
Target Upstream Version:
Embargoed:
ahughes: needinfo? (mmillson)

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System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-164619 0 None None None 2023-08-04 16:47:04 UTC
openjdk bug system JDK-8243210 0 None None None 2023-08-07 09:39:58 UTC

Description Mike Millson 2023-08-04 16:45:54 UTC 
Backport the null check in JDK-8243210[1] to avoid the following NPE when getting a thread dump:

~~~
Exception in thread "main" java.lang.NullPointerException
        at jdk.hotspot.agent/sun.jvm.hotspot.memory.FileMapInfo$FileMapHeader.inCopiedVtableSpace(FileMapInfo.java:124)
        at jdk.hotspot.agent/sun.jvm.hotspot.memory.FileMapInfo.inCopiedVtableSpace(FileMapInfo.java:104)
        at jdk.hotspot.agent/sun.jvm.hotspot.types.basic.BasicTypeDataBase.findDynamicTypeForAddress(BasicTypeDataBase.java:302)
        at jdk.hotspot.agent/sun.jvm.hotspot.runtime.VirtualBaseConstructor.instantiateWrapperFor(VirtualBaseConstructor.java:102)
        at jdk.hotspot.agent/sun.jvm.hotspot.oops.Metadata.instantiateWrapperFor(Metadata.java:73)
        at jdk.hotspot.agent/sun.jvm.hotspot.oops.Oop.getKlassForOopHandle(Oop.java:210)
        at jdk.hotspot.agent/sun.jvm.hotspot.oops.ObjectHeap.newOop(ObjectHeap.java:254)
        at jdk.hotspot.agent/sun.jvm.hotspot.oops.ObjectHeap.iterateLiveRegions(ObjectHeap.java:333)
        at jdk.hotspot.agent/sun.jvm.hotspot.oops.ObjectHeap.iterate(ObjectHeap.java:174)
        at jdk.hotspot.agent/sun.jvm.hotspot.utilities.AbstractHeapGraphWriter.write(AbstractHeapGraphWriter.java:51)
        at jdk.hotspot.agent/sun.jvm.hotspot.utilities.HeapHprofBinWriter.write(HeapHprofBinWriter.java:443)
        at jdk.hotspot.agent/sun.jvm.hotspot.tools.JMap.writeHeapHprofBin(JMap.java:182)
        at jdk.hotspot.agent/sun.jvm.hotspot.tools.JMap.run(JMap.java:97)
        at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.startInternal(Tool.java:260)
        at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.start(Tool.java:223)
        at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
        at jdk.hotspot.agent/sun.jvm.hotspot.tools.JMap.main(JMap.java:176)
        at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runJMAP(SALauncher.java:369)
        at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:538)
~~~

[1]https://bugs.openjdk.org/browse/JDK-8243210
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