Detected after JDK-8229516, but the bug is pre-existing:

$ CONF=linux-x86_64-server-fastdebug make images run-test TEST=gc/logging/TestGCId.java

# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/home/shade/trunks/jdk-jdk/src/hotspot/share/classfile/javaClasses.cpp:1687), pid=6946, tid=6949
# assert(!is_init_completed()) failed: should only happen during init
#
# JRE version: OpenJDK Runtime Environment (14.0) (fastdebug build 14-internal+0-adhoc.shade.jdk-jdk)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 14-internal+0-adhoc.shade.jdk-jdk, mixed mode, sharing, tiered, compressed oops, shenandoah gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0xe184d1] java_lang_Thread::interrupted(oop)+0x231
#
# Core dump will be written. Default location: Core dumps may be processed with "/usr/share/apport/apport %p %s %c %d %P" (or dumping to /home/shade/trunks/jdk-jdk/build/linux-x86_64-server-fastdebug/test-support/jtreg_test_hotspot_jtreg_gc_logging_TestGCId_java/scratch/0/core.6946)
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
#

Current thread (0x00007f918c288800): JavaThread "Unknown thread" [_thread_in_vm, id=6949, stack(0x00007f9197180000,0x00007f9197281000)]

Stack: [0x00007f9197180000,0x00007f9197281000], sp=0x00007f919727f8b0, free space=1022k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0xe184d1] java_lang_Thread::interrupted(oop)+0x231
V [libjvm.so+0x184dbed] JavaThread::sleep(long)+0xdd
V [libjvm.so+0x16a3920] ShenandoahPacer::pace_for_alloc(unsigned long)+0x130
V [libjvm.so+0x1669140] ShenandoahHeap::allocate_memory(ShenandoahAllocRequest&)+0x390
V [libjvm.so+0x166938d] ShenandoahHeap::allocate_new_tlab(unsigned long, unsigned long, unsigned long*)+0x3d
V [libjvm.so+0x12e996f] MemAllocator::allocate_inside_tlab_slow(MemAllocator::Allocation&) const+0x49f
V [libjvm.so+0x12ea3d4] MemAllocator::allocate() const+0x174
V [libjvm.so+0xdc3fa9] InstanceKlass::allocate_instance(Thread*)+0x79
V [libjvm.so+0xdc4150] InstanceKlass::allocate_instance_handle(Thread*)+0x20
V [libjvm.so+0x184789f] JavaThread::allocate_threadObj(Handle, char const*, bool, Thread*)+0xdf
V [libjvm.so+0xf28d48] attach_current_thread.part.188+0x1d8
V [libjvm.so+0xef18ec] jni_DestroyJavaVM+0x6c
C [libjli.so+0x43bc] JavaMain+0x25c
C [libjli.so+0x8239] ThreadJavaMain+0x9