$ cd test/hotspot/jtreg/testlibrary/ctw
$ make
$ cd dist
$ wget https://cr.openjdk.java.net/~shade/8244719/comsat-jetty-loader-0.7.0.jar
$ ./ctw.sh comsat-jetty-loader-0.7.0.jar

# Internal Error (/home/shade/trunks/jdk-jdk/src/hotspot/share/opto/node.hpp:414), pid=8257, tid=8307
# assert(!VerifyHashTableKeys || _hash_lock == 0) failed: remove node from hash table before modifying it
#
# JRE version: OpenJDK Runtime Environment (15.0) (fastdebug build 15-internal+0-adhoc.shade.jdk-jdk)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 15-internal+0-adhoc.shade.jdk-jdk, mixed mode, sharing, tiered, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x3cca84] Node::set_req(unsigned int, Node*)+0x2d4

Current CompileTask:
C2: 13564 16720 !b 4 co.paralleluniverse.strands.concurrent.AbstractQueuedLongSynchronizer$ConditionObject::awaitUntil (758 bytes)

Stack: [0x00007f59968bf000,0x00007f59969c0000], sp=0x00007f59969bcd00, free space=1015k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x3cca84] Node::set_req(unsigned int, Node*)+0x2d4
V [libjvm.so+0x12e2070] Parse::merge_common(Parse::Block*, int)+0x4d0
V [libjvm.so+0x99194f] Parse::catch_inline_exceptions(SafePointNode*)+0x15cf
V [libjvm.so+0x12dc777] Parse::do_exceptions()+0xe7
V [libjvm.so+0x12e2ec6] Parse::do_one_block()+0x286
V [libjvm.so+0x12e41b1] Parse::do_all_blocks()+0xe1
V [libjvm.so+0x12e80aa] Parse::Parse(JVMState*, ciMethod*, float)+0xcba
V [libjvm.so+0x6d7091] ParseGenerator::generate(JVMState*)+0x121
V [libjvm.so+0x8639da] Compile::Compile(ciEnv*, ciMethod*, int, bool, bool, bool, DirectiveSet*)+0xaba
V [libjvm.so+0x6d58dc] C2Compiler::compile_method(ciEnv*, ciMethod*, int, DirectiveSet*)+0xfc
V [libjvm.so+0x86ef8b] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x2db
V [libjvm.so+0x86ffc8] CompileBroker::compiler_thread_loop()+0x538
V [libjvm.so+0x166d706] JavaThread::thread_main_inner()+0x206
V [libjvm.so+0x1672566] Thread::call_run()+0xf6
V [libjvm.so+0x129c03e] thread_native_entry(Thread*)+0x10e

Logs:
 https://cr.openjdk.java.net/~shade/8244719/hs_err_pid8257.log
 https://cr.openjdk.java.net/~shade/8244719/replay_pid8257.log