Bug coming in from PSR:

Before Full GC (Allocation Failure), two Young collections were seen without
reclaiming any garbage in the G1 GC log:

[Eden: 0.0B(100.0M)->0.0B(100.0M) Survivors: 0.0B->0.0B Heap:
2038.7M(2048.0M)->2038.7M(2048.0M)]

Saw this problem in two builds:
JDK 8 b132 and special build from Bengt:

1)
java version "1.8.0"
Java(TM) SE Runtime Environment (build 1.8.0-b132)
Java HotSpot(TM) 64-Bit Server VM (build 25.0-b70, mixed mode)
2)
java version "1.8.0"
Java(TM) SE Runtime Environment (build 1.8.0-b132)
Java HotSpot(TM) 64-Bit Server VM (build
25.0-b62-internal-201403120746.brutisso.humalloc-prototype, mixed mode)