JDK-8001592 : NMT: assertion failed: assert(_amount >= amt) failed: Just check: memBaseline.hpp:180
  • Type: Bug
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: hs25
  • Priority: P2
  • Status: Closed
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2012-10-25
  • Updated: 2014-09-22
  • Resolved: 2012-11-10
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JDK 7 JDK 8 Other
7u40Fixed 8Fixed hs24Fixed
The assertion failure indicates that NMT mis-counted arena sizes, which caused total arena size exceeded total memory chunks backing the arenas.

Hard to verify, not possible to create regression test.

This bug was found when NMT was enabled and a NMT query was submitted. It was hard to reproduce, and there is not easy way to write a test case for it.