The following test failed in the JDK21 CI:

applications/javafuzzer/BigTest.java

Here's a snippet from the log file:

Summary of the JavaFuzzer run:
------------------------------
Host: win2016-x64-318369
Tests: 12 x 300
Args: -conf config.yml

Started at: Wed Mar 29 00:39:56 GMT 2023


r2- 300: 195 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 105 Reference Java failures
r3- 300: 186 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 114 Reference Java failures
r8- 300: 193 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 107 Reference Java failures
r5- 300: 190 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 110 Reference Java failures
r7- 300: 190 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 110 Reference Java failures
r11- 300: 187 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 113 Reference Java failures
r9- 300: 195 passed, 2 crashes, 0 fails, 0 hangs, 0 incorrect tests, 104 Reference Java failures
r6- 300: 177 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 123 Reference Java failures
r10- 300: 193 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 107 Reference Java failures
r4- 300: 180 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 120 Reference Java failures
r12- 300: 189 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 111 Reference Java failures
r1- 300: 172 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 128 Reference Java failures

Finished at: Wed Mar 29 09:12:11 GMT 2023


#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (c:\\sb\\prod\\1679905400\\workspace\\open\\src\\hotspot\\share\\opto/node.hpp:399), pid=25280, tid=33752
# assert(_outcnt==1) failed: not unique
#
# JRE version: Java(TM) SE Runtime Environment (21.0+16) (fastdebug build 21-ea+16-LTS-1273)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 21-ea+16-LTS-1273, compiled mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, windows-amd64)
# Core dump will be written. Default location: C:\\sb\\prod\\1680050168\\testoutput\\test-support\\jtreg_closed_test_hotspot_jtreg_applications_javafuzzer_BigTest_java\\tmp\\fuzzer.tmp.j9KE0q2XuQ\\hs_err_pid25280.mdmp
#
# 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:(51/4106)*----------
java.nio.charset.MalformedInputException: Input length = 1
at java.base/java.nio.charset.CoderResult.throwException(CoderResult.java:274)
at java.base/sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:388)
at java.base/sun.nio.cs.StreamDecoder.lockedRead(StreamDecoder.java:219)
at java.base/sun.nio.cs.StreamDecoder.read(StreamDecoder.java:173)
at java.base/java.io.InputStreamReader.read(InputStreamReader.java:189)
at java.base/java.io.BufferedReader.fill(BufferedReader.java:161)
at java.base/java.io.BufferedReader.implReadLine(BufferedReader.java:371)
at java.base/java.io.BufferedReader.readLine(BufferedReader.java:348)
at java.base/java.io.BufferedReader.readLine(BufferedReader.java:437)
at java.base/java.nio.file.Files.readAllLines(Files.java:3390)
at java.base/java.nio.file.Files.readAllLines(Files.java:3428)
at applications.javafuzzer.JavaFuzzerRunner.lambda$main$2(JavaFuzzerRunner.java:233)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1924)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
at applications.javafuzzer.JavaFuzzerRunner.main(JavaFuzzerRunner.java:231)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:312)
at java.base/java.lang.Thread.run(Thread.java:1623)
java.lang.RuntimeException: Failed to access C:\\sb\\prod\\1680050168\\testoutput\\test-support\\jtreg_closed_test_hotspot_jtreg_applications_javafuzzer_BigTest_java\\scratch\\0\\crashes\\r9-250\\hs_err_pid25280.mdmp
at applications.javafuzzer.JavaFuzzerRunner.lambda$main$2(JavaFuzzerRunner.java:237)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1924)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
at applications.javafuzzer.JavaFuzzerRunner.main(JavaFuzzerRunner.java:231)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:312)
at java.base/java.lang.Thread.run(Thread.java:1623)

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


Here's the crashing thread's stack:

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

Current thread (0x00000147cc6b1f40): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=33752, stack(0x0000001238400000,0x0000001238500000)]


Current CompileTask:
C2: 690 10 !b 4 Test::vMeth1 (207 bytes)

Stack: [0x0000001238400000,0x0000001238500000]
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [jvm.dll+0xbf4331] os::win32::platform_print_native_stack+0xf1 (os_windows_x86.cpp:236)
V [jvm.dll+0xe6f4b0] VMError::report+0x10c0 (vmError.cpp:814)
V [jvm.dll+0xe71065] VMError::report_and_die+0x645 (vmError.cpp:1587)
V [jvm.dll+0xe71774] VMError::report_and_die+0x64 (vmError.cpp:1352)
V [jvm.dll+0x578419] report_vm_error+0x79 (debug.cpp:181)
V [jvm.dll+0xc3c8be] PhaseCCP::push_more_uses+0x5ee (phaseX.cpp:2062)
V [jvm.dll+0xc393dd] PhaseCCP::analyze+0x75d (phaseX.cpp:1991)
V [jvm.dll+0xc35bff] PhaseCCP::PhaseCCP+0x10f (phaseX.cpp:1933)
V [jvm.dll+0x50cb91] Compile::Optimize+0xca1 (compile.cpp:2373)
V [jvm.dll+0x509e4e] Compile::Compile+0x174e (compile.cpp:841)
V [jvm.dll+0x427ec5] C2Compiler::compile_method+0x145 (c2compiler.cpp:121)
V [jvm.dll+0x524519] CompileBroker::invoke_compiler_on_method+0x849 (compileBroker.cpp:2268)
V [jvm.dll+0x521bdd] CompileBroker::compiler_thread_loop+0x24d (compileBroker.cpp:1945)
V [jvm.dll+0x7ed072] JavaThread::thread_main_inner+0x282 (javaThread.cpp:711)
V [jvm.dll+0xde4453] Thread::call_run+0x253 (thread.cpp:229)
V [jvm.dll+0xbf2c28] os::win32::thread_native_entry+0xb8 (os_windows.cpp:551)
C [ucrtbase.dll+0x1fb80]
C [KERNEL32.DLL+0x84d4]
C [ntdll.dll+0x51791]