The following test failed in the JDK20 CI:

tools/javac/modules/EdgeCases.java

Here's a snippet from the log file:

----------System.err:(175/8934)*----------
test: testUnnamedPackage
[STDOUT]:
noModule
[DIRECT]:
warning: [options] bootstrap class path not set in conjunction with -source 8
warning: [options] source value 8 is obsolete and will be removed in a future release
warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
warning: No SupportedSourceVersion annotation found on EdgeCases$UnnamedPackageProcessor, returning RELEASE_6.
warning: Supported source version 'RELEASE_6' from annotation processor 'EdgeCases$UnnamedPackageProcessor' less than -source '8'
5 warnings
[STDOUT]:
unnamedModule
[DIRECT]:
warning: No SupportedSourceVersion annotation found on EdgeCases$UnnamedPackageProcessor, returning RELEASE_6.
warning: Supported source version 'RELEASE_6' from annotation processor 'EdgeCases$UnnamedPackageProcessor' less than -source '20'
2 warnings
[STDOUT]:
m
[DIRECT]:
warning: No SupportedSourceVersion annotation found on EdgeCases$UnnamedPackageProcessor, returning RELEASE_6.
warning: Supported source version 'RELEASE_6' from annotation processor 'EdgeCases$UnnamedPackageProcessor' less than -source '20'
2 warnings
[STDOUT]:
null
m1x: true
m2x: true
[DIRECT]:
testUnnamedPackage\\srcNamed2\\m1x\\Test.java:1: error: unnamed package is not allowed in named modules
public class Test {}
^
testUnnamedPackage\\srcNamed2\\m2x\\Test.java:1: error: unnamed package is not allowed in named modules
public class Test {}
^
warning: No SupportedSourceVersion annotation found on EdgeCases$UnnamedPackageProcessor, returning RELEASE_6.
warning: Supported source version 'RELEASE_6' from annotation processor 'EdgeCases$UnnamedPackageProcessor' less than -source '20'
Note: Multiple elements named '' in modules 'm1x, m2x' were found by javax.lang.model.util.Elements.getPackageElement.
2 errors
2 warnings

test: testEmptyInExportedPackage
file explicitly specified:
[DIRECT]:
module-info.java:1:20: compiler.err.package.empty.or.not.found: api
1 error
file not specified:
[DIRECT]:
module-info.java:1:20: compiler.err.package.empty.or.not.found: api
1 error

test: testMisnamedModuleInfoClass
[DIRECT]:
module-info.java:1:28: compiler.err.doesnt.exist: com.example
1 error

test: testWrongPackageInExportedPackage
file explicitly specified:
[DIRECT]:
module-info.java:1:20: compiler.err.package.empty.or.not.found: api
1 error
file not specified:
[DIRECT]:
module-info.java:1:20: compiler.err.package.empty.or.not.found: api
1 error

test: testDependOnUnnamedAccessibility
compiling unnamed sources:
compiling test module:

test: testJustPackageInExportedPackage
file explicitly specified:
file not specified:

test: testParseEnterAnalyze

test: testStripUnknownRequired
[STDOUT]:
from directives:
java.base
from requires:
java.base
[DIRECT]:
testStripUnknownRequired\\src\\test\\module-info.java:1: error: module not found: m1x
module test { requires m1x; requires m2x; requires java.base; requires m3x; requires m4x; }
^
1 error

test: testAddExportUndefinedModule
[DIRECT]:
- compiler.warn.module.for.option.not.found: --add-exports, undefModule
Test.java:1:34: compiler.err.doesnt.exist: undefPackage
1 error
1 warning

test: testModuleSymbolOutterMostClass

test: testModuleImplicitModuleBoundaries
[DIRECT]:
Test.java:1:52: compiler.err.not.def.access.class.intf.cant.access.reason: call(), api1.Api1, api1, (compiler.misc.not.def.access.does.not.read: m3x, api1, m1x)
Test.java:1:76: compiler.err.not.def.access.class.intf.cant.access: toString(), java.lang.Object
2 errors

test: testAssignClassToAutomaticModule

test: testClassPackageClash
[DIRECT]:
m1x.java:2:8: compiler.err.clash.with.pkg.of.same.name: kindname.class, test.m1x
1 error

test: testEmptyImplicitModuleInfo
[DIRECT]:
- compiler.err.cant.access: module-info, (compiler.misc.bad.source.file.header: module-info.java, (compiler.misc.file.does.not.contain.module))
1 error

test: testImplicitJavaBase
[DIRECT]:
- compiler.err.cant.access: <error>.module-info, (compiler.misc.bad.class.file.header: module-info.class, (compiler.misc.illegal.start.of.class.file))
1 error
[DIRECT]:
- compiler.err.cant.access: module-info, (compiler.misc.bad.source.file.header: module-info.java, (compiler.misc.file.does.not.contain.module))
1 error

test: testModuleInfoNameMismatchSource
[DIRECT]:
module-info.java:1:1: compiler.err.module.name.mismatch: other, m1x
- compiler.err.cant.access: m1x.module-info, (compiler.misc.cant.resolve.modules)
2 errors

test: testModuleInfoNameMismatchClass
[DIRECT]:
- compiler.err.cant.access: m1x.module-info, (compiler.misc.bad.class.file.header: module-info.class, (compiler.misc.module.name.mismatch: other, m1x))
module-info.java:1:1: compiler.err.module.not.found: m1x
2 errors

test: testGetDirectivesComplete

test: testPackageInModuleInfo
[DIRECT]:
module-info.java:1:1: compiler.err.no.pkg.in.module-info.java
1 error

test: testOnDemandCompletionModuleInfoJava
[DIRECT]:
module-info.java:1:23: compiler.warn.has.been.deprecated.module: m1x
module-info.java:1:37: compiler.warn.has.been.deprecated.module: m1x
2 warnings

test: testInvisibleClassVisiblePackageClash

test: testExportedNameCheckFromSourceNoEvent
Exception running test testExportedNameCheckFromSourceNoEvent: java.lang.AssertionError: Unexpected log, got: [COMPILATION:started:<none>, PARSE:started:testExportedNameCheckFromSourceNoEvent\\src\\m\\module-info.java, PARSE:finished:testExportedNameCheckFromSourceNoEvent\\src\\m\\module-info.java, ENTER:started:testExportedNameCheckFromSourceNoEvent\\src\\m\\module-info.java, ENTER:finished:testExportedNameCheckFromSourceNoEvent\\src\\m\\module-info.java, ANALYZE:started:testExportedNameCheckFromSourceNoEvent\\src\\m\\module-info.java, ANALYZE:finished:testExportedNameCheckFromSourceNoEvent\\src\\m\\module-info.java, COMPILATION:finished:<none>], expected: [COMPILATION:started:<none>, PARSE:started:testExportedNameCheckFromSourceNoEvent/src/m/module-info.java, PARSE:finished:testExportedNameCheckFromSourceNoEvent/src/m/module-info.java, ENTER:started:testExportedNameCheckFromSourceNoEvent/src/m/module-info.java, ENTER:finished:testExportedNameCheckFromSourceNoEvent/src/m/module-info.java, ANALYZE:started:testExportedNameCheckFromSourceNoEvent/src/m/module-info.java, ANALYZE:finished:testExportedNameCheckFromSourceNoEvent/src/m/module-info.java, COMPILATION:finished:<none>]
java.lang.AssertionError: Unexpected log, got: [COMPILATION:started:<none>, PARSE:started:testExportedNameCheckFromSourceNoEvent\\src\\m\\module-info.java, PARSE:finished:testExportedNameCheckFromSourceNoEvent\\src\\m\\module-info.java, ENTER:started:testExportedNameCheckFromSourceNoEvent\\src\\m\\module-info.java, ENTER:finished:testExportedNameCheckFromSourceNoEvent\\src\\m\\module-info.java, ANALYZE:started:testExportedNameCheckFromSourceNoEvent\\src\\m\\module-info.java, ANALYZE:finished:testExportedNameCheckFromSourceNoEvent\\src\\m\\module-info.java, COMPILATION:finished:<none>], expected: [COMPILATION:started:<none>, PARSE:started:testExportedNameCheckFromSourceNoEvent/src/m/module-info.java, PARSE:finished:testExportedNameCheckFromSourceNoEvent/src/m/module-info.java, ENTER:started:testExportedNameCheckFromSourceNoEvent/src/m/module-info.java, ENTER:finished:testExportedNameCheckFromSourceNoEvent/src/m/module-info.java, ANALYZE:started:testExportedNameCheckFromSourceNoEvent/src/m/module-info.java, ANALYZE:finished:testExportedNameCheckFromSourceNoEvent/src/m/module-info.java, COMPILATION:finished:<none>]
at EdgeCases.testExportedNameCheckFromSourceNoEvent(EdgeCases.java:1147)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at toolbox.TestRunner.runTests(TestRunner.java:89)
at ModuleTestBase.runTests(ModuleTestBase.java:49)
at EdgeCases.main(EdgeCases.java:85)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
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)

22 tests, 1 errors
java.lang.Exception: 1 errors found
at toolbox.TestRunner.runTests(TestRunner.java:116)
at ModuleTestBase.runTests(ModuleTestBase.java:49)
at EdgeCases.main(EdgeCases.java:85)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
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.Exception
JavaTest Message: shutting down test

result: Failed. Execution failed: `main' threw exception: java.lang.Exception: 1 errors found