We hosted a java application in websphere 9 / jre 1.8. Intermittently JVM crash and generating the javacore. We are getting below error in java core , assertion failure error.
j9mm.141 - * ** ASSERTION FAILED ** AT LargeObjectAllocateStats.cpp:1126: ((false))**
GC History :
j9mm.621 - GC Assertion message: Calculated value of getSizeClassIndex() 133 can not be larger then maximum 122
j9mm.465 - CopyForward start
min heap size : 2GB
max heap size : 4GB
used heap size : 2GB at the time of GC
GC policy : balanced
I don't see an existing GitHub issue, so I think your best bet would be to open a new user raised issue so that GC devs can triage it.