JDK-8000968 : NPG: UseCompressedKlassPointers asserts with ObjectAlignmentInBytes for >32G CompressedOops
- Type: Bug
- Component: hotspot
- Sub-Component: runtime
- Affected Version: hs25
- Priority: P2
- Status: Closed
- Resolution: Fixed
- Submitted: 2012-10-16
- Updated: 2014-01-14
- Resolved: 2013-02-04
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| JDK 8 | Other |
|---|---|
8Fixed  |
hs25Fixed |
Description
$ java -XX:ObjectAlignmentInBytes=32 -Xms70g -version # A fatal error has been detected by the Java Runtime Environment: # # Internal Error (/tmp/jprt/P1/205937.amurillo/s/src/share/vm/oops/oop.inline.hpp:237), pid=3544, tid=140382950360832 # assert((result & CONST64(0xffffffff00000000)) == 0) failed: narrow klass pointer overflow # # JRE version: (8.0-b60) # Java VM: Java HotSpot(TM) 64-Bit Server VM (25.0-b05-internal-201210122059.amurillo.hs25-b05-snapshot-fastdebug mixed mode linux-amd64 compressed oops) It appears that compressed klass pointers does not gracefully fall back and disable if the klass pointer cannot be encoded with the compressed oops shift. ILW=HML => P2 I=H, VM crash at startup L=M, not uncommon customer scenario to have 32G+ heap sizes W=L, disable UseCompressedOops or UseCompressedKlassPointers
Comments
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