Parse::do_lookupswitch fails with "assert(_cnt >= 0) failed"

The following test failed in the JDK16 CI:

applications/dacapo/Dacapo24H.java

Here's a snippet from the log file:

[2020-08-11T21:49:06.956031148Z] Gathering output for process 7716
[2020-08-11T21:49:08.971282128Z] Waiting for completion for process 7716
[2020-08-11T21:49:08.971573437Z] Waiting for completion finished for process 7716
Output and diagnostic info for process 7716 was saved into 'pid-7716-output.log'
[2020-08-11T21:49:08.973894788Z] Waiting for completion for process 7716
[2020-08-11T21:49:08.973952798Z] Waiting for completion finished for process 7716
[stress.process.out] #
[stress.process.out] # A fatal error has been detected by the Java Runtime Environment:
[stress.process.out] #
[stress.process.out] # Internal Error (/opt/mach5/mesos/work_dir/slaves/4728e7c1-7e67-490e-be0f-6bbf2a2f33db-S170/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/196f2dcf-68ed-4a11-8800-10f95ee8a7a5/runs/94cff4f6-eeed-4e7c-92d4-daf613c186d8/workspace/open/src/hotspot/share/opto/parse2.cpp:329), pid=11907, tid=22347
[stress.process.out] # Error: assert(_cnt >= 0) failed
[stress.process.out] #
[stress.process.out] # JRE version: Java(TM) SE Runtime Environment (16.0+11) (fastdebug build 16-ea+11-386)
[stress.process.out] # Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 16-ea+11-386, mixed mode, sharing, tiered, compressed oops, g1 gc, linux-amd64)
[stress.process.out] # Problematic frame:
[stress.process.out] # V [libjvm.so+0x142147c] Parse::do_lookupswitch()+0x58c
[stress.process.out] #
[stress.process.out] # Core dump will be written. Default location: Core dumps may be processed with "/opt/core.sh %p" (or dumping to /opt/mach5/mesos/work_dir/slaves/4728e7c1-7e67-490e-be0f-6bbf2a2f33db-S39/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/7b57845f-d02e-4d07-859e-b468beca682c/runs/1161fa51-1c39-427a-8f9d-d38efbe4f6f3/testoutput/test-support/jtreg_closed_test_hotspot_jtreg_applications_dacapo_Dacapo24H_java/scratch/0/core.11907)
[stress.process.out] #
[stress.process.out] Unsupported internal testing APIs have been used.
[stress.process.out]
[stress.process.out] # An error report file with more information is saved as:
[stress.process.out] # /opt/mach5/mesos/work_dir/slaves/4728e7c1-7e67-490e-be0f-6bbf2a2f33db-S39/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/7b57845f-d02e-4d07-859e-b468beca682c/runs/1161fa51-1c39-427a-8f9d-d38efbe4f6f3/testoutput/test-support/jtreg_closed_test_hotspot_jtreg_applications_dacapo_Dacapo24H_java/scratch/0/hs_err_pid11907.log
[stress.process.out] #
[stress.process.out] # Compiler replay data is saved as:
[stress.process.out] # /opt/mach5/mesos/work_dir/slaves/4728e7c1-7e67-490e-be0f-6bbf2a2f33db-S39/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/7b57845f-d02e-4d07-859e-b468beca682c/runs/1161fa51-1c39-427a-8f9d-d38efbe4f6f3/testoutput/test-support/jtreg_closed_test_hotspot_jtreg_applications_dacapo_Dacapo24H_java/scratch/0/replay_pid11907.log
[stress.process.out] #
[stress.process.out] # If you would like to submit a bug report, please visit:
[stress.process.out] # https://bugreport.java.com/bugreport/crash.jsp
[stress.process.out] #


Stress process failed. See stress.process.err/stress.process.out files for details.


Here's the crashing thread's stack:

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

Current thread (0x00007f70a11f7680): JavaThread "C2 CompilerThread1" daemon [_thread_in_native, id=22347, stack(0x00007f70a90e8000,0x00007f70a91e9000)]


Current CompileTask:
C2:86672490 4214870 % 4 org.eclipse.jdt.internal.core.index.DiskIndex::readStreamChars @ 130 (485 bytes)

Stack: [0x00007f70a90e8000,0x00007f70a91e9000], sp=0x00007f70a91e5c90, 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+0x142147c] Parse::do_lookupswitch()+0x58c
V [libjvm.so+0x1424a78] Parse::do_one_bytecode()+0x2f78
V [libjvm.so+0x140f641] Parse::do_one_block()+0x601
V [libjvm.so+0x141052d] Parse::do_all_blocks()+0x11d
V [libjvm.so+0x1414aa4] Parse::Parse(JVMState*, ciMethod*, float)+0xbd4
V [libjvm.so+0x74ff15] ParseGenerator::generate(JVMState*)+0x115
V [libjvm.so+0x8fe976] Compile::Compile(ciEnv*, ciMethod*, int, bool, bool, bool, bool, DirectiveSet*)+0xc66
V [libjvm.so+0x74e2e4] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x184
V [libjvm.so+0x90e8d0] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xde0
V [libjvm.so+0x90f698] CompileBroker::compiler_thread_loop()+0x6b8
V [libjvm.so+0x16c692f] JavaThread::thread_main_inner()+0x22f
V [libjvm.so+0x16cbf40] Thread::call_run()+0x100
V [libjvm.so+0x13d0876] thread_native_entry(Thread*)+0x116