Synopsis is provisional, feel free to change it as you see fit.

The attached fuzzer test fails:

$ build/linux-x86_64-server-fastdebug/images/jdk/bin/java -cp 0015/ -Xmx512m -XX:+UnlockDiagnosticVMOptions -XX:+StressLCM -XX:+StressGCM -XX:+StressCCP -XX:+StressIGVN -Xcomp -XX:CompileOnly=Test -XX:-TieredCompilation -XX:StressSeed=95886967 Test

# Internal Error (/home/shade/trunks/jdk/src/hotspot/share/opto/gcm.cpp:276), pid=1065282, tid=1065295
# assert(false) failed: unscheduable graph
#
# JRE version: OpenJDK Runtime Environment (19.0) (fastdebug build 19-internal-adhoc.shade.jdk)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 19-internal-adhoc.shade.jdk, compiled mode, sharing, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0xdce852] assert_dom(Block*, Block*, Node*, PhaseCFG const*)+0x1c2

It is semi-intermittent without StressSeed setting.

Bisection points to JDK-8230382 as the first bad commit.

Copied from JDK-8283460 (duplicate bug):
Reopened as separate bug: JDK-8286638.

$ build/linux-x86_64-server-fastdebug/images/jdk/bin/java -cp 0029/ -Xmx512m -XX:+UnlockDiagnosticVMOptions -XX:+StressIGVN -Xcomp -XX:CompileOnly=Test -XX:-TieredCompilation Test
CompileCommand: compileonly Test.* bool compileonly = true
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/gcm.cpp:766
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/home/shade/trunks/jdk/src/hotspot/share/opto/gcm.cpp:766), pid=3733508, tid=3733521
# assert(!LCA_orig->dominates(pred_block) || early->dominates(pred_block)) failed: early is high enough
#
# JRE version: OpenJDK Runtime Environment (19.0) (fastdebug build 19-internal-adhoc.shade.jdk)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 19-internal-adhoc.shade.jdk, compiled mode, sharing, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0xdd1fe5] PhaseCFG::insert_anti_dependences(Block*, Node*, bool)+0x18a5

It is somewhat intermittent, and seems to rely on StressIGVN.