JDK-8241296 : Segfault in JNIHandleBlock::oops_do()
- Type: Bug
- Component: hotspot
- Sub-Component: runtime
- Affected Version: 7,8,11,13,14,15
- Priority: P2
- Status: Closed
- Resolution: Fixed
- CPU: generic
- Submitted: 2020-03-19
- Updated: 2020-06-17
- Resolved: 2020-03-20
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| JDK 11 | JDK 13 | JDK 14 | JDK 15 | Other |
|---|---|---|---|---|
| 11.0.7Fixed | 13.0.4Fixed | 14.0.2Fixed | 15 b16Fixed  |
openjdk8u252Fixed |
Description
We're seeing intermittent SEGVs in JDKs with some newer GCC versions and combinations of options. It turns out that it's a pretty trivial error which has never been noticed before.
Thread::oops_do() does this:
void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) {
active_handles()->oops_do(f);
However, there is a window while a Thread is being constructed when active_handles() is NULL. GC can occur during this time period, and it's a matter of luck that we haven't seen this crash before.
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