JDK-8173794 : [REDO] [AOT] Missing GC scan of _metaspace_got array containing Klass*
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 9
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • OS: linux
  • CPU: x86
  • Submitted: 2017-02-01
  • Updated: 2017-03-13
  • Resolved: 2017-02-07
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JDK 10 JDK 9
10Fixed 9 b159Fixed
Related Reports
Blocks :  
JDK-8173699 - Crash during deoptimization with "assert(result == __null || result->is_oop()) failed: must be oop"
Cloners :  
JDK-8172990 - [AOT] Missing GC scan of _metaspace_got array containing Klass*
Relates :  
JDK-8173019 - Backout JDK-8172990 changes.
Description
The code which scans _metaspace_got array is commented out:

#if 0
  // With the marking above, this call doesn't seem to be needed
   got_metadata_do(f);

Unfortunately called AOTCompiledMethod::metadata_do() does not iterate over all Klass* which could be referenced by AOT code by accessing  _metaspace_got array.
Comments
[~kvn] Yes, but 8173699 is the fix you need.
02-02-2017
[~dean] Dean, do you want me re-apply JDK-8172990 changes after JDK-8173795 is fixed?
02-02-2017
JDK-8173019 backout original fix for JDK-8172990 because VM failed in deoptimization code.
02-02-2017