OpenJDK / jdk / jdk
changeset 56078:2d2c2428bf52
8230116: Test workaround to Klass::_class_loader_data sometimes NULL problem
Summary: This is a low frequency problem that we are seeing internally, this patch is mostly to rule out one theory.
Reviewed-by: dcubed
| author | coleenp |
|---|---|
| date | Fri, 23 Aug 2019 23:27:19 +0000 |
| parents | 7ae075afc72f |
| children | 427b38332f20 170b727a240a |
| files | src/hotspot/share/oops/klass.cpp |
| diffstat | 1 files changed, 6 insertions(+), 0 deletions(-) [+] |
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--- a/src/hotspot/share/oops/klass.cpp Fri Aug 23 15:24:26 2019 -0400 +++ b/src/hotspot/share/oops/klass.cpp Fri Aug 23 23:27:19 2019 +0000 @@ -568,6 +568,12 @@ // Restore class_loader_data to the null class loader data set_class_loader_data(loader_data); + // Workaround for suspected bug. Make sure other threads see this assignment. + // This shouldn't be necessary but the compiler thread seems to be behind + // the times, even though this thread takes MethodCompileQueue_lock and the thread + // that doesn't see this value also takes that lock. + OrderAccess::fence(); + // Add to null class loader list first before creating the mirror // (same order as class file parsing) loader_data->add_class(this);