The following test failed in the JDK21 CI:
java/lang/String/LiteralReplace.java
Here's a snippet from the log file:
----------stdout:(21/1124)*----------
#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00007ffedf8120e2, pid=42888, tid=47848
#
# JRE version: Java(TM) SE Runtime Environment (21.0+25) (build 21-ea+25-LTS-2128)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (21-ea+25-LTS-2128, mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, windows-amd64)
# Problematic frame:
# V [jvm.dll+0x5f20e2] PhaseIdealLoop::build_loop_late_post_work+0x272
#
# Core dump will be written. Default location: C:\\sb\\prod\\1685037075\\testoutput\\test-support\\jtreg_open_test_jdk_tier1_part1\\scratch\\1\\hs_err_pid42888.mdmp
#
# An error report file with more information is saved as:
# C:\\sb\\prod\\1685037075\\testoutput\\test-support\\jtreg_open_test_jdk_tier1_part1\\scratch\\1\\hs_err_pid42888.log
#
# Compiler replay data is saved as:
# C:\\sb\\prod\\1685037075\\testoutput\\test-support\\jtreg_open_test_jdk_tier1_part1\\scratch\\1\\replay_pid42888.log
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
#
result: Error. Agent communication error: java.net.SocketException: Connection reset; check console log for any additional details
Here's the crashing thread's stack:
--------------- T H R E A D ---------------
Current thread (0x0000016054ef6100): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=47848, stack(0x0000005efc300000,0x0000005efc400000) (1024K)]
Current CompileTask:
C2: 87063 4915 4 java.util.regex.Pattern$StartS::match (138 bytes)
Stack: [0x0000005efc300000,0x0000005efc400000], sp=0x0000005efc3face0, free space=1003k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [jvm.dll+0x5f20e2] PhaseIdealLoop::build_loop_late_post_work+0x272 (loopnode.cpp:6064)
V [jvm.dll+0x5f1e14] PhaseIdealLoop::build_loop_late+0x214 (loopnode.cpp:5910)
V [jvm.dll+0x5f0f98] PhaseIdealLoop::build_and_optimize+0x708 (loopnode.cpp:4407)
V [jvm.dll+0x251fc4] PhaseIdealLoop::optimize+0x114 (loopnode.hpp:1201)
V [jvm.dll+0x24a664] Compile::Optimize+0xcb4 (compile.cpp:2359)
V [jvm.dll+0x247ede] Compile::Compile+0xd4e (compile.cpp:840)
V [jvm.dll+0x1c9641] C2Compiler::compile_method+0xc1 (c2compiler.cpp:121)
V [jvm.dll+0x257ab9] CompileBroker::invoke_compiler_on_method+0x739 (compileBroker.cpp:2268)
V [jvm.dll+0x25609a] CompileBroker::compiler_thread_loop+0x26a (compileBroker.cpp:1945)
V [jvm.dll+0x3ee546] JavaThread::run+0x116 (javaThread.cpp:704)
V [jvm.dll+0x7f8558] Thread::call_run+0xc8 (thread.cpp:227)
V [jvm.dll+0x6c344d] os::win32::thread_native_entry+0x7d (os_windows.cpp:551)
C [ucrtbase.dll+0x1fb80]
C [KERNEL32.DLL+0x84d4]
C [ntdll.dll+0x51791]
With a debug build:
Bad graph detected in build_loop_late
n: 1891 Bool === _ 1890 [[ 1883 ]] [ne] !orig=[1018] !jvms: Pattern::lambda$negate$7 @ bci:2 (line 5818) 0x800000032::is @ bci:5 Pattern::lambda$and$2 @ bci:12 (line 5795) 0x0000000801061988::is @ bci:9 Pattern$CharProperty::match @ bci:37 (line 4109) Pattern$StartS::match @ bci:44 (line 3820)
early(n): 1934 IfFalse === 1933 [[ 1827 591 ]] #0 !orig=[1818]
n->in(1): 1890 CmpP === _ 1006 25 [[ 1891 ]] !orig=[1017] !jvms: Pattern::lambda$negate$7 @ bci:2 (line 5818) 0x800000032::is @ bci:5 Pattern::lambda$and$2 @ bci:12 (line 5795) 0x0000000801061988::is @ bci:9 Pattern$CharProperty::match @ bci:37 (line 4109) Pattern$StartS::match @ bci:44 (line 3820)
early(n->in(1)): 1934 IfFalse === 1933 [[ 1827 591 ]] #0 !orig=[1818]
n->in(1)->in(1): 1006 DecodeN === _ 1005 [[ 1029 1890 ]] #java/lang/Object * Oop:java/lang/Object * !orig=[1889],... !jvms: 0x800000032::is @ bci:1 Pattern::lambda$and$2 @ bci:12 (line 5795) 0x0000000801061988::is @ bci:9 Pattern$CharProperty::match @ bci:37 (line 4109) Pattern$StartS::match @ bci:44 (line 3820)
early(n->in(1)->in(1)): 1934 IfFalse === 1933 [[ 1827 591 ]] #0 !orig=[1818]
n->in(1)->in(2): 25 ConP === 0 [[ 26 34 140 1178 215 1890 1871 1815 1171 1909 1834 1265 1917 1272 ]] #null
early(n->in(1)->in(2)): 0 Root === 0 38 1641 93 1648 124 1614 1579 204 1182 1491 1476 376 391 1107 481 518 565 1649 1200 1293 1276 762 832 856 917 1077 1237 [[ 0 1 3 25 33 40 41 54 55 75 88 108 136 153 157 166 231 1620 316 1619 355 371 399 1299 505 1259 1256 585 650 715 1187 726 1033 971 731 736 748 757 800 801 802 803 813 820 844 860 865 902 905 1688 1715 1724 1728 1923 ]]
LCA(n): 1926 IfFalse === 1925 [[ 1883 977 ]] #0 !orig=[1874]
n->out(0): 1883 If === 1926 1891 [[ 1884 1885 ]] P=0,999999, C=-1,000000
n->out(0)->out(0): 1884 IfTrue === 1883 [[ 1941 1029 ]] #1
n->out(0)->out(1): 1885 IfFalse === 1883 [[ 1846 ]] #0
idoms of early "1934 IfFalse":
idom[21]: 1926 IfFalse
idom[20]: 1883 If
idom[19]: 1884 IfTrue
idom[18]: 1941 If
idom[17]: 1942 IfFalse
idom[16]: 1902 If
idom[15]: 1903 IfTrue
idom[14]: 1911 If
idom[13]: 1912 IfTrue
idom[12]: 84 ParsePredicate
idom[11]: 94 IfTrue
idom[10]: 1785 If
idom[9]: 1786 IfTrue
idom[8]: 1929 If
idom[7]: 1930 IfFalse
idom[6]: 1797 If
idom[5]: 1798 IfTrue
idom[4]: 1945 If
idom[3]: 1946 IfFalse
idom[2]: 1809 If
idom[1]: 1810 IfTrue
idom[0]: 1933 If
n: 1934 IfFalse
idoms of (wrong) LCA "1926 IfFalse":
n: 1926 IfFalse
Real LCA of early "1934 IfFalse" (idom[21]) and wrong LCA "1926 IfFalse":
1926 IfFalse === 1925 [[ 1883 977 ]] #0 !orig=[1874]
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/opt/mach5/mesos/work_dir/slaves/741e9afd-8c02-45c3-b2e2-9db1450d0832-S172117/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/79c14d5a-c3a8-484b-8985-95db5d2b9d8b/runs/8a9050ac-9e8d-4077-97c9-481f59b3e962/workspace/open/src/hotspot/share/opto/loopnode.cpp:6060), pid=3591450, tid=3591463
# assert(false) failed: Bad graph detected in build_loop_late
#
# JRE version: Java(TM) SE Runtime Environment (21.0+25) (fastdebug build 21-ea+25-LTS-2128)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 21-ea+25-LTS-2128, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x1295a04] PhaseIdealLoop::build_loop_late_post_work(Node*, bool)+0x904