The following test failed in the JDK20 CI:

applications/javafuzzer/BigTest.java

Here's a snippet from the log file:

Summary of the JavaFuzzer run:
------------------------------
Host: <host>
Tests: 12 x 300
Args: -conf config.yml

Started at: Tue Aug 9 04:03:31 GMT 2022


r10- 300: 194 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 106 Reference Java failures
r7- 300: 191 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 109 Reference Java failures
r2- 300: 182 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 118 Reference Java failures
r6- 300: 178 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 122 Reference Java failures
r1- 300: 184 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 116 Reference Java failures
r12- 300: 181 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 119 Reference Java failures
r4- 300: 181 passed, 2 crashes, 0 fails, 0 hangs, 0 incorrect tests, 118 Reference Java failures
r9- 300: 181 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 119 Reference Java failures
r8- 300: 185 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 115 Reference Java failures
r5- 300: 186 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 114 Reference Java failures
r11- 300: 178 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 122 Reference Java failures
r3- 300: 171 passed, 0 crashes, 0 fails, 0 hangs, 0 incorrect tests, 129 Reference Java failures

Finished at: Tue Aug 9 12:05:43 GMT 2022


#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (c:\\sb\\prod\\1659780030\\workspace\\open\\src\\hotspot\\share\\opto/node.hpp:925), pid=50512, tid=50840
# assert(is_OuterStripMinedLoop()) failed: invalid node class: IfTrue
#
# JRE version: Java(TM) SE Runtime Environment (20.0+10) (fastdebug build 20-ea+10-545)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 20-ea+10-545, compiled mode, sharing, compressed oops, compressed class ptrs, g1 gc, windows-amd64)
# Core dump will be written. Default location: C:\\sb\\prod\\1660017689\\testoutput\\test-support\\jtreg_closed_test_hotspot_jtreg_applications_javafuzzer_BigTest_java\\tmp\\fuzzer.tmp.axklN8HRXL\\hs_err_pid50512.mdmp
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
#

Command line flags: -Xmx1G -Xcomp -Xbatch -XX:CompileOnly=Test -XX:CompileCommand=quiet

Here's the crashing thread's stack:

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

Current thread (0x00000143e6ff8260): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=50840, stack(0x0000003f9bf00000,0x0000003f9c000000)]


Current CompileTask:
C2: 576 11 b Test::vMeth1 (274 bytes)

Stack: [0x0000003f9bf00000,0x0000003f9c000000]
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [jvm.dll+0xc5e0e1] os::win32::platform_print_native_stack+0xf1 (os_windows_x86.cpp:236)
V [jvm.dll+0xebb2fe] VMError::report+0x10de (vmError.cpp:839)
V [jvm.dll+0xebcd2e] VMError::report_and_die+0x65e (vmError.cpp:1687)
V [jvm.dll+0xebd4a4] VMError::report_and_die+0x64 (vmError.cpp:1468)
V [jvm.dll+0x59c427] report_vm_error+0xb7 (debug.cpp:284)
V [jvm.dll+0xab43f0] Node::as_OuterStripMinedLoop+0x50 (node.hpp:925)
V [jvm.dll+0xad0ada] LoopNode::verify_strip_mined+0xda (loopnode.cpp:2160)
V [jvm.dll+0x536686] Compile::final_graph_reshaping_main_switch+0x15c6 (compile.cpp:3721)
V [jvm.dll+0x534f94] Compile::final_graph_reshaping_impl+0x484 (compile.cpp:3138)
V [jvm.dll+0x5373a0] Compile::final_graph_reshaping_walk+0x2b0 (compile.cpp:3880)
V [jvm.dll+0x533ff4] Compile::final_graph_reshaping+0x2b4 (compile.cpp:3982)
V [jvm.dll+0x5307f6] Compile::Optimize+0x1786 (compile.cpp:2466)
V [jvm.dll+0x52cf5d] Compile::Compile+0x14ad (compile.cpp:824)
V [jvm.dll+0x452b45] C2Compiler::compile_method+0x145 (c2compiler.cpp:115)
V [jvm.dll+0x547050] CompileBroker::invoke_compiler_on_method+0x980 (compileBroker.cpp:2314)
V [jvm.dll+0x5445fc] CompileBroker::compiler_thread_loop+0x25c (compileBroker.cpp:1982)
V [jvm.dll+0x81383f] JavaThread::thread_main_inner+0x29f (javaThread.cpp:700)
V [jvm.dll+0xe34b57] Thread::call_run+0x257 (thread.cpp:229)
V [jvm.dll+0xc5ca08] thread_native_entry+0xb8 (os_windows.cpp:546)
C [ucrtbase.dll+0x2268a]
C [KERNEL32.DLL+0x17974]
C [ntdll.dll+0x5a0b1]