RFR: 8203491: [TESTBUG] Port heapdump tests into java
leonid.mesnik at oracle.com
Wed May 23 01:15:41 UTC 2018
Could you please review following patch which rewrite vmTestbase/heapdump tests as a jtreg java tests.
These heapdump tests were developed as a shell tests which verify heapdump functionality in JDK 5. They work fine but needs some refactoring.
webrev: http://cr.openjdk.java.net/~lmesnik/8203491/webrev.00/ <http://cr.openjdk.java.net/~lmesnik/8203491/webrev.00/>
bug: https://bugs.openjdk.java.net/browse/JDK-8203491 <https://bugs.openjdk.java.net/browse/JDK-8203491>
Below is high-level overview of existing tests and changes:
1) Tests vmTestbase/heapdump/OnOOM* verify that VM correctly generates heapdump when OOME in heap or metaspace happens. Also they verify that -XX:HeapDumpPath= works correctly.
Test provokes OOME and verifies generated heapdump.
Please note that new jtreg test is very similar and use same test patterns as most of ErrorHandling tests in http://hg.openjdk.java.net/jdk/jdk/file/tip/test/hotspot/jtreg/runtime/ErrorHandling <http://hg.openjdk.java.net/jdk/jdk/file/tip/test/hotspot/jtreg/runtime/ErrorHandling>
The main goal is to verify error handling when OOME is happen so I used the same way to provoke OOME as most of other tests in this directory.
New test might takes more then minute to complete test so I removed from tier1.
2) Tests vmTestbase/heapdump/JMap* verify that jmap correctly generates heapdump from live process and core/mdmp file.
There are existing tests which verify that jmap could correctly dump heap for live process:
I believe that they provide the same coverage as heapdump/JMapHeap and heapdump/JMapMetaspace tests and no new tests is needed.
The new test which verifies that jmap generate heapdump for corefile is:
Test provokes OOME to generate corefile (or mdml), generate heapdump with jhsdb jmap and verify it. Previously tests send signals to provoke coredump. Since JDK9 option 'CreateCoredumpOnCrash' could be used to easily dump core on all platforms. Please note that test silently pass if it doesn't find core file. Even if test tries to set ulimit -c unlimited there is no guarantee that core file is generated and could be found.
I have verified that test still could reproduce issue https://bugs.openjdk.java.net/browse/JDK-8176557 <https://bugs.openjdk.java.net/browse/JDK-8176557> if default heap size is large enough. However I think that it make a sense to add variant of this test which explicit heap settings as a regression fix for bug JDK-8176557 <https://bugs.openjdk.java.net/browse/JDK-8176557>.
Also I haven't managed to reproduce following issues with neither existing or new tests:
Corresponding tests were excluded for a long time so there are no any results for them. I also see comments in bugs with unsuccessful attempts to reproduce issues. I think that it makes a sense just to remove these entries from problemlist and file new open bugs if any of failures happen.
I quickly looked through all resolved bugs found by heapdump/ tests. Most of them are related with different size limits overflow. It might be make a sense also create test which fill heap with large amount of small objects to possible overflow of sizes of records. The similar functionality was removed by JDK-8144137 <https://bugs.openjdk.java.net/browse/JDK-8144137>. But I would prefer to have separate RFE since it is not supported by existing tests.
Please let me know if it is possible to lost test coverage during this conversion and more tests are needed. The more conservative way might be to left existing tests for some time to see if if they still found different bugs.
Run new tests on linux-x64,windows-x64,macos-x64.
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