RFR: 8263044: jdk/jfr/jvm/TestDumpOnCrash.java timed out

[Erik Gahlin]

Hi,

When a crash/emergency dump is created, it is sometimes not complete.

This is OK as there is no guarantee that a dump will succeed when the JVM crashes. Problem occurs if this happens before the first metadata event has been written (metadataPosition == 0) in which case the parser will loop indefinitely.

This is expected behavior in the streaming case (EventStream), but if the recording was opened with RecordingFile it is usually able to finish or throw an exception. The fix is to invoke pollWait() if a valid recording only consists of the header (68 bytes). This will result in similar behaviour as if the recording was terminated prematurely, but the metadata event had been written. 

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/10629/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10629&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8263044
  Stats: 12 lines in 1 file changed: 10 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/10629.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10629/head:pull/10629

PR: https://git.openjdk.org/jdk/pull/10629