Memory leak during stress - insert only workload to cap collection

db version v3.0.1-pre-
git version: 0cbcdfd5b4cd4961b448f1a35fd0d4ea19629b93

Environment:

• Single machine
• Windows 2008
• Each instance uses 1GB RAM of cache

Workload:

• Used hammer.mongo to do insert only workload to cap collection of 1Gbyte

• Attached UMDH output that highlight the allocations that remained in memory