JDK-8264393 : JDK-8258284 introduced dangling TLH race
- Type: Bug
- Component: hotspot
- Sub-Component: runtime
- Affected Version: 17
- Priority: P3
- Status: Resolved
- Resolution: Fixed
- OS: generic
- CPU: generic
- Submitted: 2021-03-29
- Updated: 2021-04-08
- Resolved: 2021-04-03
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| JDK 17 |
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17 b17Fixed  |
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Description
I ported some 20 year old tests using JDK-8262881 in order to help test [~rehn]'s fix for JDK-8257831. These tests in combination with one piece of the fix from JDK-8257831 revealed a bug in my fix for JDK-8258284 from back in Dec 2020. The race revealed by the ported tests from JDK-8262881 happens only with nested ThreadsListHandles. When TLH2 is destroyed, the thread updates its threads_hazard_ptr from the TLH2-list to the TLH1-list; I made this change back in 2020.12 using JDK-8258284. The threads_hazard_ptr can be observed by a thread calling ThreadsSMRSupport::free_list() as a stable ThreadsList at the same time as the TLH1 destructor is decrementing the nested_handle_cnt that permits the ThreadsList to be freed. So the thread calling ThreadsSMRSupport::free_list() thinks it has a stable hazard ptr (TLH1-list), but that hazard ptr can be freed and causes lots of confusion.
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