JDK-8068739 : G1CollectorPolicy uses uninitialized field '_sigma' in the constructor
- Type: Bug
- Component: hotspot
- Sub-Component: gc
- Affected Version: 9
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- Submitted: 2015-01-09
- Updated: 2015-06-03
- Resolved: 2015-01-13
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| JDK 9 |
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9 b48Fixed  |
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Description
The G1CollectorPolicy constructor uses a huge initializer list. In this list it calls "new SurvRateGroup(this, ..)" passing passing it a reference to the no yet fully initialized G1CollectorPolicy instance. Via the following call chain, the SurvRateGroup constructor calls back to G1CollectorPolicy::get_new_prediction() which uses the uninitialzed value of G1CollectorPolicy::_sigma: G1CollectorPolicy::G1CollectorPolicy SurvRateGroup::SurvRateGroup SurvRateGroup::reset SurvRateGroup::all_surviving_words_recorded G1CollectorPolicy::get_new_prediction Depending on the indefinite value of '_sigma' this can lead to situations, where a GC is triggered before the whole system is initialized and ready for a GC resulting in the following crash: Error occurred during initialization of VM GC triggered before VM initialization completed. Try increasing NewSize, current value 5324K. The fix is trivial - initialize the G1CollectorPolicy members in the right order
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