APAR status
Closed as program error.
Error description
Error Message: A SIGSEGV/GPF is received during a GC . Stack Trace: MM_MemorySubSpaceSemiSpace::checkSubSpaceMemoryPostCollectRe MM_MemorySubSpaceSemiSpace::checkResize(MM_EnvironmentModron MM_Scavenger::masterThreadGarbageCollect(MM_EnvironmentModro MM_Scavenger::internalGarbageCollect(MM_EnvironmentModron*,M MM_ParallelScavenger::internalGarbageCollect(MM_EnvironmentM MM_Collector::garbageCollect(MM_EnvironmentModron*,MM_Memory MM_MemorySubSpaceSemiSpace::allocationRequestFailed(MM_Envir MM_MemorySubSpaceGeneric::allocateTLH(MM_EnvironmentModron*, MM_TLHAllocationInterface::refresh(MM_EnvironmentModron*,MM_ MM_TLHAllocationInterface::allocateObject(MM_EnvironmentModr MM_TLHAllocationInterface::allocateArrayletSpine(MM_Environm MM_ArrayletAllocationModel::allocateAndInitializeLayout(MM_M MM_ArrayletAllocationModel::allocateIndexableObject(MM_Envir . Crash has only been observed on large systems with highly frequent scavenges and a small heap
Local fix
Increase the size of the Heap to reduce the frequency of svacenges
Problem summary
The problem is caused when the time between scavenges and the scan time are below 1ms, due to the accuracy of the system clock these numbers are rounded to 0 causing an IEEE exponent-underflow
Problem conclusion
This defect will be fixed in: 7.0.0 SR5 6.0.1 SR6 . The JVM has been updated to not resize the heap post collect if the time interval from the system is 0.
Temporary fix
Comments
APAR Information
APAR number
IV38666
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
2013-03-27
Closed date
2013-04-26
Last modified date
2013-04-26
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
[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSNVBF","label":"Runtimes for Java Technology"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"6.1","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]
Document Information
Modified date:
21 February 2022