JDK-6838842 : NUMA allocator: Segfault during startup on Linux
  • Type: Bug
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: hs15,7
  • Priority: P3
  • Status: Closed
  • Resolution: Fixed
  • OS: generic,linux
  • CPU: generic
  • Submitted: 2009-05-08
  • Updated: 2011-03-08
  • Resolved: 2011-03-08
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JDK 6 JDK 7 Other
6u14pFixed 7Fixed hs15Fixed
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Description
The semantics of os::uncommit_memory() has changes with the fix for 6541756 (Reduce executable C-heap). This function is used in the NUMA-aware allocator to free pages. Instead, now it does an mmap(PROT_NONE), which causes the VM to trap on the next access.

Comments
EVALUATION http://hg.openjdk.java.net/jdk7/hotspot/hotspot/rev/622212a69394
2009-05-09

EVALUATION The semantics of os::free_memory() has changed with the fix for 6541756 (Reduce executable C-heap). This function is used in the NUMA-aware allocator to free pages. Instead, now it does an mmap(PROT_NONE), which causes the VM to trap on the next access. The fix is to change this function to have its original semantics.
2009-05-08

SUGGESTED FIX http://cr.openjdk.java.net/~iveresov/6838842/webrev.00
2009-05-08