JDK-6755512 : CMS: unsafe generation expansion
  • Type: Bug
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: hs14
  • Priority: P3
  • Status: Closed
  • Resolution: Duplicate
  • OS: generic
  • CPU: generic
  • Submitted: 2008-10-03
  • Updated: 2010-05-10
  • Resolved: 2008-10-29
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Other
hs14Resolved
Related Reports
Duplicate :  
JDK-6755514 - CMS: sharpen asserts related to free list consistency and locking
Description
Recent testing of CMS w/tightened lock assertion checking revealed
that we may be vulnerable to a race when expanding a CMS generation.
Comments
EVALUATION This was revealed from a tightened assertion. It turns out that the tightened assertion was much too strong. So this was not a bug per se, but an assertion that was made too tight. The assertion has now been fixed, and the fix will be checked in as part of the cleanup done in the fragmentation related bug covered in 6631166 (and 6755514). I'll close this bug as a duplicate of 6755514 (and 6631166) for that reason only.
29-10-2008
WORK AROUND Fixing the size of CMS generations works around the bug: -Xms == -Xmx *and* -XX:PermSize == -XX:MaxPermSize
03-10-2008