Crash seen on libgraal:

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/workspace/open/src/hotspot/share/jfr/leakprofiler/chains/bfsClosure.cpp:208), pid=21923, tid=18691
# assert(pointee != nullptr) failed: invariant
#
# JRE version: Java(TM) SE Runtime Environment (21.0+1) (fastdebug build 21-galahadstaging+1-LTS-89)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 21-galahadstaging+1-LTS-89, mixed mode, sharing, tiered, jvmci, jvmci compiler, compressed oops, compressed class ptrs, g1 gc, bsd-amd64)
# Core dump will be written. Default location: core.21923
#

This is caused by libgraal clearing (i.e. zeroing) JNI handles[1] while the VM thread may be performing an operation that involves traversing the object graph (e.g. the JFR leakprofiler). Since libgraal executes as JNI native code (i.e. _thread_in_native), the VM thread does not expect it to be mutating JNI handles.

[1]: https://github.com/openjdk/jdk/blob/b92de54a81a4037a5396509d41de57323212639c/src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/IndirectHotSpotObjectConstantImpl.java#L161