JDK-8209163 : SA: Show Object Histogram asserts with ZGC
- Type: Bug
- Component: core-svc
- Sub-Component: tools
- Affected Version: 11,12
- Priority: P3
- Status: Resolved
- Resolution: Fixed
- OS: generic
- CPU: generic
- Submitted: 2018-08-08
- Updated: 2018-09-19
- Resolved: 2018-09-14
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Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
| JDK 12 |
|---|
12 b12Fixed  |
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Description
The HSDB Show Object Histogram command asserts when using ZGC. It should report that ZGC is unsupported.
How to reproduce:
1. Run debuggee with -XX:+UnlockExperimentalVMOptions -XX:+UseZGC
2. Attach HSDB to the debuggee
$ jhsdb hsdb --pid <PID>
3. Show Object Histogram
[Tools] -> [Object Histogram]
Exception on HSDB console:
```
sun.jvm.hotspot.utilities.AssertionFailure: Unexpected CollectedHeap type: sun.jvm.hotspot.gc.z.ZCollectedHeap
at jdk.hotspot.agent/sun.jvm.hotspot.utilities.Assert.that(Assert.java:32)
at jdk.hotspot.agent/sun.jvm.hotspot.oops.ObjectHeap.collectLiveRegions(ObjectHeap.java:448)
at jdk.hotspot.agent/sun.jvm.hotspot.oops.ObjectHeap.iterate(ObjectHeap.java:173)
at jdk.hotspot.agent/sun.jvm.hotspot.HSDB$VisitHeap.run(HSDB.java:1741)
at jdk.hotspot.agent/sun.jvm.hotspot.utilities.WorkerThread$MainLoop.run(WorkerThread.java:70)
at java.base/java.lang.Thread.run(Thread.java:832)
```
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