I've observed the following crash once with Kitchensink

# Internal Error (open/src/hotspot/share/gc/z/zBarrier.cpp:48), pid=31921, tid=4719
# assert(ZAddress::is_marked(addr)) failed: Should be marked

Current thread (0x00007f58c83a71e0): JavaThread "BenchmarkThread xml.transform 1" [_thread_in_Java, id=4719, stack(0x00007f58a073e000,0x00007f58a083f000)]

Stack: [0x00007f58a073e000,0x00007f58a083f000], sp=0x00007f58a083c5e0, free space=1017k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x17fdd8e] unsigned long ZBarrier::mark<false, true>(unsigned long)+0x1de
V [libjvm.so+0x181441f] ZBarrierSetRuntime::load_barrier_on_oop_field_preloaded(oopDesc*, oop*)+0x9f

This is very similar to JDK-8208757 which I was never able to reproduce.