Hi Tony!
Thanks for filing:
JDK-8239497 SEGV in EdgeUtils::field_name_symbol(Edge const&)
https://bugs.openjdk.java.net/browse/JDK-8239497
I've added hotspot-jfr-dev@... alias to this thread, but the JFR
folks usually lurk on the Serviceability alias also.
Dan
On 2/19/20 1:33 PM, Tony Printezis wrote:
FWIW, this is the stack trace when the crash happens:
EdgeUtils::field_name_symbol(Edge const&)
ObjectSampleWriter::write(StoredEdge const*)
ObjectSampleWriter::operator()(StoredEdge&)
ObjectSampleCheckpoint::write(ObjectSampler*, EdgeStore*, bool, Thread*)
EventEmitter::write_events(ObjectSampler*, EdgeStore*, bool)
PathToGcRootsOperation::doit()
VM_Operation::evaluate()
VMThread::evaluate_operation(VM_Operation*)
VMThread::loop()
VMThread::run()
—————
Tony Printezis | @TonyPrintezis | tprinte...@twitter.com
<mailto:tprinte...@twitter.com>
On February 19, 2020 at 1:22:35 PM, Tony Printezis
(tprinte...@twitter.com <mailto:tprinte...@twitter.com>) wrote:
Hi,
(Is this the right mailing list for this?)
I’ve been looking at a SEGV in EdgeUtils::field_name_symbol(Edge
const&) that we have been seeing in our nightly testing when running
jdk/jfr/jcmd/TestJcmdDump.java. I can reproduce it using graal and
parallel gc (cms also) on Linux with our 11 release, as well as
OpenJDK 11u, 12, 13, and 14.
The culprit seems to be this method:
static const InstanceKlass* field_type(const StoredEdge& edge) {
assert(!edge.is_root() || !EdgeUtils::is_array_element(edge),
"invariant");
return (const InstanceKlass*)edge.reference_owner_klass();
}
In fact, edge.reference_owner_klass()->is_instance_klass() == false,
as the class here seems to be an object array class (I’ve seen
[Ljava.lang.Class; and [Ljava.lang.Enum;).
Is this a known issue? I’m not familiar with this code. Should
field_name_symbol() return NULL in this case?
Thanks,
Tony
—————
Tony Printezis | @TonyPrintezis | tprinte...@twitter.com
<mailto:tprinte...@twitter.com>
