APAR status
Closed as program error.
Error description
Error Message: N/A . Stack Trace: N/A . Using jdmpview's info heap command the following output is printed out: Heap #1: Default@80875cce8 Section #1: Heap extent at 0x827f01000 (0x18000000 bytes) Size: 402653184 bytes Shared: false Executable: false Read Only: false Section #2: Heap extent at 0x847f01000 (0x7333000 bytes) Size: 120795136 bytes Shared: false Executable: false Read Only: false Section #3: Heap extent at 0x84f234000 (0xccd000 bytes) Size: 13422592 bytes Shared: false Executable: false Read Only: false Heap #2: Default@80875cb08 Section #1: Heap extent at 0x827f01000 (0x18000000 bytes) Size: 402653184 bytes Shared: false Executable: false Read Only: false Section #2: Heap extent at 0x847f01000 (0x7333000 bytes) Size: 120795136 bytes Shared: false Executable: false Read Only: false Section #3: Heap extent at 0x84f234000 (0xccd000 bytes) Size: 13422592 bytes Shared: false Executable: false Read Only: false Heap #3: Default@80875cbf8 Section #1: Heap extent at 0x827f01000 (0x18000000 bytes) Size: 402653184 bytes Shared: false Executable: false Read Only: false Section #2: Heap extent at 0x847f01000 (0x7333000 bytes) Size: 120795136 bytes Shared: false Executable: false Read Only: false Section #3: Heap extent at 0x84f234000 (0xccd000 bytes) Size: 13422592 bytes Shared: false Executable: false Read Only: false Note that all 3 heaps overlap in memory and there actually should only be one heap with three sections. The above data was obtaied using JavaRuntime's getHeaps() method, and subsequently JavaHeap's getSections().
Local fix
Note that this only affect DDR DTFJ when trying to read cores from 2.3/2.4 JVMs. However DDR DTFJ is only shipped in 2.6 and up. Thus this problem only appears to people using 2.6 JVMs looking at 2.3/2.4 JVM core files. The fix/workaround is therefore to use java626sr2/java7sr1 or up when using DTFJ/jdmpview.
Problem summary
The problem is caused by an faulty implementation of JavaRunTime.getHeaps() which returns 'ImageSections' instead of the proper 'DTFJavaHeaps'.
Problem conclusion
This defect will be fixed in: 7.0.0 SR1 6.0.1 SR2 . Fixed by having DTFJJavaHeaps be represented by J9MemorySpaces and ImageSections be represented by J9MemorySegments.
Temporary fix
Comments
APAR Information
APAR number
IV20824
Reported component name
J9 COMMON CODE
Reported component ID
620700127
Reported release
260
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2012-05-08
Closed date
2012-05-08
Last modified date
2012-05-08
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
J9 COMMON CODE
Fixed component ID
620700127
Applicable component levels
R260 PSY
UP
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Document Information
Modified date:
21 February 2022