EVALUATION
Failed trying to allocate c-heap space for a 320MB preserved mark stack. The fix for 6423256, pushed yesterday to http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot, may help. It grows GC stacks in small chunks, instead of requiring the stack to live in a contiguous chunk of memory and doubling the size (and copying the data) each time it must grow.