The following test failed in the JDK16 CI:

java/util/jar/JarFile/mrjar/MultiReleaseJarHttpProperties.java

Here's a snippet from the log file:

#section:testng
----------messages:(5/411)----------
command: testng -Djdk.util.jar.version=8 -Djdk.util.jar.enableMultiRelease=force MultiReleaseJarHttpProperties
reason: User specified action: run testng/othervm -Djdk.util.jar.version=8 -Djdk.util.jar.enableMultiRelease=force MultiReleaseJarHttpProperties
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.jartool,jdk.compiler,jdk.httpserver
elapsed time (seconds): 11.614
----------configuration:(3/67)----------
Boot Layer
  add modules: jdk.jartool jdk.compiler jdk.httpserver

----------System.out:(21/1340)----------
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x000000010f23d117, pid=70466, tid=40963
#
# JRE version: Java(TM) SE Runtime Environment (16.0+13) (fastdebug build 16-ea+13-511)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 16-ea+13-511, compiled mode, sharing, compressed oops, g1 gc, bsd-amd64)
# Problematic frame:
# V [libjvm.dylib+0x43d117] Node::is_dead_loop_safe() const+0x7
#
# Core dump will be written. Default location: core.70466
#
# An error report file with more information is saved as:
# /System/Volumes/Data/mesos/work_dir/slaves/4076d11c-c6ed-4d07-84c1-4ab8d55cd975-S47664/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/d3e254ae-631c-426d-8787-ae3ac28ff6e6/runs/fe6b3aae-1e19-4dbd-910b-3e8f3bc357f1/testoutput/test-support/jtreg_open_test_jdk_jdk_util/scratch/1/hs_err_pid70466.log
#
# Compiler replay data is saved as:
# /System/Volumes/Data/mesos/work_dir/slaves/4076d11c-c6ed-4d07-84c1-4ab8d55cd975-S47664/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/d3e254ae-631c-426d-8787-ae3ac28ff6e6/runs/fe6b3aae-1e19-4dbd-910b-3e8f3bc357f1/testoutput/test-support/jtreg_open_test_jdk_jdk_util/scratch/1/replay_pid70466.log
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
#
----------System.err:(0/0)----------
----------rerun:(51/9324)*----------


Here's the crashing thread's stack:

--------------- T H R E A D ---------------

Current thread (0x00007ff1d6810020): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=40963, stack(0x0000700000ceb000,0x0000700000deb000)]


Current CompileTask:
C2: 8154 1286 !b java.lang.invoke.DirectMethodHandle::makePreparedFieldLambdaForm (1044 bytes)

Stack: [0x0000700000ceb000,0x0000700000deb000], sp=0x0000700000de7a00, free space=1010k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.dylib+0x43d117] Node::is_dead_loop_safe() const+0x7
V [libjvm.dylib+0xe2d484] PhaseGVN::dead_loop_check(Node*)+0xb4
V [libjvm.dylib+0xe3015f] PhaseIterGVN::transform_old(Node*)+0xaf
V [libjvm.dylib+0xe2fc96] PhaseIterGVN::optimize()+0x1f6
V [libjvm.dylib+0x518821] Compile::Optimize()+0x611
V [libjvm.dylib+0x516473] Compile::Compile(ciEnv*, ciMethod*, int, bool, bool, bool, bool, DirectiveSet*)+0x12d3
V [libjvm.dylib+0x40be60] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x1d0
V [libjvm.dylib+0x532cd8] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x6c8
V [libjvm.dylib+0x53231c] CompileBroker::compiler_thread_loop()+0x34c
V [libjvm.dylib+0x10156e6] JavaThread::thread_main_inner()+0x316
V [libjvm.dylib+0x1010877] Thread::call_run()+0x1b7
V [libjvm.dylib+0xdd249f] thread_native_entry(Thread*)+0x15f
C [libsystem_pthread.dylib+0x6109] _pthread_start+0x94
C [libsystem_pthread.dylib+0x1b8b] thread_start+0xf


siginfo: si_signo: 11 (SIGSEGV), si_code: 1 (SEGV_MAPERR), si_addr: 0x00006ff1b80d2de0