org.eclipse.mat.SnapshotException: Illegal primitive object array type when parsing 42 GB heap dump using linux command

[eclipsewebmaster]

| --- | --- | | Bugzilla Link | 582890 | | Status | NEW | | Importance | P3 major | | Reported | Jan 28, 2024 04:03 EDT | | Modified | Feb 13, 2024 23:55 EDT | | Version | 1.15 | | Reporter | priyadharshini Ravi |

Description

org.eclipse.mat.SnapshotException: Illegal primitive object array type when parsing 42 GB heap dump using Linux command

Error message:

org.eclipse.mat.SnapshotException: Illegal primitive object array type
at org.eclipse.mat.hprof.Pass1Parser.readPrimitiveArrayDump(Pass1Parser.java:707)
at org.eclipse.mat.hprof.Pass1Parser.readDumpSegments(Pass1Parser.java:384)
at org.eclipse.mat.hprof.Pass1Parser.read(Pass1Parser.java:186)
at org.eclipse.mat.hprof.HprofIndexBuilder.fill(HprofIndexBuilder.java:80)
at org.eclipse.mat.parser.internal.SnapshotFactoryImpl.parse(SnapshotFactoryImpl.java:222)
at org.eclipse.mat.parser.internal.SnapshotFactoryImpl.openSnapshot(SnapshotFactoryImpl.java:126)
at org.eclipse.mat.snapshot.SnapshotFactory.openSnapshot(SnapshotFactory.java:147)
at org.eclipse.mat.internal.apps.ParseSnapshotApp.parse(ParseSnapshotApp.java:136)
at org.eclipse.mat.internal.apps.ParseSnapshotApp.start(ParseSnapshotApp.java:108)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)

Kindly suggest any ideas to overcome this issue.

[eclipsewebmaster]

By priyadharshini Ravi on Feb 05, 2024 00:40

Any update on this?

[eclipsewebmaster]

By Gowtham K on Feb 13, 2024 23:55

Kindly suggest parsing this 42 GB dump in the Linux command for the below error

[jasonk000]

Priyadharshini - are you able to share some more detail? It looks like the heap is not able to be parsed in this code ..

https://github.com/eclipse-mat/mat/blob/b55b54a492ddba8303aa14874876041ccbdf6ece/plugins/org.eclipse.mat.hprof/src/org/eclipse/mat/hprof/Pass1Parser.java#L854-L855

This suggests to me maybe either some corruption with the hprof file, or maybe a different version of JVM is used to export the heap. Are you able to share any more information about it?

[jasonk000]

Marking this closed, but please reopen if we see another example. My suspicion is it was a corrupted heapdump, but happy to be corrected!