The following test failed an assert in the JDK22 CI:

applications/javafuzzer/BigTest.java

Here's a snippet from the log file:

#section:driver
----------messages:(7/309)----------
command: driver applications.javafuzzer.JavaFuzzerRunner -NT 300
reason: User specified action: run driver/timeout=100000 applications.javafuzzer.JavaFuzzerRunner -NT 300
started: Sat Jan 06 05:08:15 GMT 2024
Mode: agentvm
Agent id: 2
finished: Sat Jan 06 17:38:56 GMT 2024
elapsed time (seconds): 45040.799
----------configuration:(16/2546)----------

<snip>

----------System.out:(52/4717)----------
For random generator using seed: 1049105939623813467
To re-run test with same seed value please add "-Djdk.test.lib.random.seed=1049105939623813467" to command line.
Using JRuby dist path: /System/Volumes/Data/mesos/work_dir/jib-master/install/org/jruby/jruby-dist/9.2.12.0/jruby-dist-9.2.12.0-bin.zip/jruby-9.2.12.0
[DBG] Created generator string: '/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-22+31-2291/macosx-x64-debug.jdk/jdk-22/fastdebug/bin/java --module-path /System/Volumes/Data/mesos/work_dir/jib-master/install/org/jruby/jruby-dist/9.2.12.0/jruby-dist-9.2.12.0-bin.zip/jruby-9.2.12.0/lib/jruby.jar --add-opens java.base/sun.nio.ch=org.jruby.dist --add-opens java.base/java.io=org.jruby.dist -Djruby.home=/System/Volumes/Data/mesos/work_dir/jib-master/install/org/jruby/jruby-dist/9.2.12.0/jruby-dist-9.2.12.0-bin.zip/jruby-9.2.12.0 -Djruby.lib=/System/Volumes/Data/mesos/work_dir/jib-master/install/org/jruby/jruby-dist/9.2.12.0/jruby-dist-9.2.12.0-bin.zip/jruby-9.2.12.0/lib org.jruby.Main -W0 -I /System/Volumes/Data/mesos/work_dir/jib-master/install/com/oracle/jpg/bigapps/javafuzzer/javafuzzer/3.2/javafuzzer-3.2.zip/rb /System/Volumes/Data/mesos/work_dir/jib-master/install/com/oracle/jpg/bigapps/javafuzzer/javafuzzer/3.2/javafuzzer-3.2.zip/rb/Fuzzer.rb -f /System/Volumes/Data/mesos/work_dir/jib-master/install/com/oracle/jpg/bigapps/javafuzzer/javafuzzer/3.2/javafuzzer-3.2.zip/rb/config.yml'
Starting JavaFuzzer: '/bin/bash /System/Volumes/Data/mesos/work_dir/jib-master/install/com/oracle/jpg/bigapps/javafuzzer/javafuzzer/3.2/javafuzzer-3.2.zip/mrt.sh -R /System/Volumes/Data/mesos/work_dir/slaves/b8be9c31-0e0c-4781-900b-aa9694854b6a-S4433/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/412296fe-3046-437b-8f7d-6891751cdcf2/runs/82c4a490-87b5-4a68-a182-4e75a4fbb68e/testoutput/test-support/jtreg_closed_test_hotspot_jtreg_applications_javafuzzer_BigTest_java/scratch/0 -NT 300 -NP 12 -A -conf config.yml'
[2024-01-06T05:08:21.844331Z] Gathering output for process 19138
[2024-01-06T17:38:56.003037Z] Waiting for completion for process 19138
[2024-01-06T17:38:56.003358Z] Waiting for completion finished for process 19138
Output and diagnostic info for process 19138 was saved into 'pid-19138-output.log'

Summary of the JavaFuzzer run:
------------------------------
Host: jpg-mac-x64-029.us.oracle.com
Tests: 12 x 300
Args: -conf config.yml

Started at: Sat Jan 6 05:08:22 GMT 2024


r1- 300: 180 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 120 Reference Java failures
r5- 300: 184 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 116 Reference Java failures
r8- 300: 173 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 127 Reference Java failures
r4- 300: 167 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 133 Reference Java failures
r10- 300: 171 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 129 Reference Java failures
r11- 300: 173 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 127 Reference Java failures
r9- 300: 163 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 137 Reference Java failures
r7- 300: 182 passed, 1 crashes, 0 fails, 0 hangs, 0 incorrect tests, 117 Reference Java failures
r6- 300: 184 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 116 Reference Java failures
r12- 300: 167 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 133 Reference Java failures
r2- 300: 171 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 129 Reference Java failures
r3- 300: 159 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 141 Reference Java failures

Finished at: Sat Jan 6 17:38:55 GMT 2024


#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/System/Volumes/Data/mesos/work_dir/slaves/0db9c48f-6638-40d0-9a4b-bd9cc7533eb8-S29383/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/83d8cb3b-40f7-4b64-8c21-159e6ef386d9/runs/ad6c5410-4399-4119-8438-85fa3145168b/workspace/open/src/hotspot/share/opto/loopopts.cpp:290), pid=62552, tid=39939
# assert(n->in(0) == nullptr) failed: divisions with zero check should already have bailed out earlier in split-if
#
# JRE version: Java(TM) SE Runtime Environment (22.0+31) (fastdebug build 22-ea+31-2291)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 22-ea+31-2291, mixed mode, sharing, compressed oops, compressed class ptrs, g1 gc, bsd-amd64)
# No core dump will be written. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
#

--------------- S U M M A R Y ------------


----------System.err:(15/908)----------
java.lang.RuntimeException: assertEquals: expected 1 to equal 2
at jdk.test.lib.Asserts.fail(Asserts.java:634)
at jdk.test.lib.Asserts.assertEquals(Asserts.java:205)
at jdk.test.lib.Asserts.assertEquals(Asserts.java:189)
at applications.javafuzzer.JavaFuzzerRunner.reportResults(JavaFuzzerRunner.java:264)
at applications.javafuzzer.JavaFuzzerRunner.runWithConfigurations(JavaFuzzerRunner.java:285)
at applications.javafuzzer.JavaFuzzerRunner.main(JavaFuzzerRunner.java:307)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:333)
at java.base/java.lang.Thread.run(Thread.java:1570)

JavaTest Message: Test threw exception: java.lang.RuntimeException
JavaTest Message: shutting down test

result: Failed. Execution failed: `main' threw exception: java.lang.RuntimeException: assertEquals: expected 1 to equal 2


Here's the crashing thread's stack:

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

Current thread (0x00007fdc9a023010): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=39939, stack(0x0000700002a4e000,0x0000700002b4e000) (1024K)]


Current CompileTask:
C2:217 1 % !b Test::mainTest @ 122 (538 bytes)

Stack: [0x0000700002a4e000,0x0000700002b4e000], sp=0x0000700002b49d30, free space=1007k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.dylib+0x1232154] VMError::report_and_die(int, char const*, char const*, __va_list_tag*, Thread*, unsigned char*, void*, void*, char const*, int, unsigned long)+0x5a4 (loopopts.cpp:290)
V [libjvm.dylib+0x1232928] VMError::report_and_die(Thread*, void*, char const*, int, char const*, char const*, __va_list_tag*)+0x38
V [libjvm.dylib+0x651a04] report_vm_error(char const*, int, char const*, char const*, ...)+0xb4
V [libjvm.dylib+0xd5ce8f] PhaseIdealLoop::cannot_split_division(Node const*, Node const*) const+0x11f
V [libjvm.dylib+0xd5c285] PhaseIdealLoop::split_thru_phi(Node*, Node*, int)+0xa5
V [libjvm.dylib+0xd61d96] PhaseIdealLoop::split_if_with_blocks_pre(Node*)+0x316
V [libjvm.dylib+0xd652cc] PhaseIdealLoop::split_if_with_blocks(VectorSet&, Node_Stack&)+0x1dc
V [libjvm.dylib+0xd520e2] PhaseIdealLoop::build_and_optimize()+0xa82
V [libjvm.dylib+0x5b7648] PhaseIdealLoop::optimize(PhaseIterGVN&, LoopOptsMode)+0x58
V [libjvm.dylib+0x5b0b02] Compile::Optimize()+0x712
V [libjvm.dylib+0x5aeef2] Compile::Compile(ciEnv*, ciMethod*, int, Options, DirectiveSet*)+0x15d2
V [libjvm.dylib+0x473768] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x1b8
V [libjvm.dylib+0x5cdb3f] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xaaf
V [libjvm.dylib+0x5ccc87] CompileBroker::compiler_thread_loop()+0x357
V [libjvm.dylib+0x9ae085] JavaThread::thread_main_inner()+0x1a5
V [libjvm.dylib+0x117baec] Thread::call_run()+0xbc
V [libjvm.dylib+0xefa652] thread_native_entry(Thread*)+0x122
C [libsystem_pthread.dylib+0x64e1] _pthread_start+0x7d
C [libsystem_pthread.dylib+0x1f6b] thread_start+0xf