In jazzer,when i run "bazel coverage ",throws ClassNotFoundException.

[Xingyunting]

I want to use build coverage in jazzer.When I run “bazel run //examples:ExampleFuzzerWithUBSan”,got success.But when I run “bazel coverage //examples:ExampleFuzzerWithUBSan”,the testlog print out:

exec ${PAGER:-/usr/bin/less} "$0" || exit 1
Executing tests from //examples:ExampleFuzzerWithUBSan
-----------------------------------------------------------------------------
singlejar_local: ./src/tools/singlejar/mapped_file_posix.inc:42: open /private/var/tmp/_bazel_xyt/b041260c26ede733a242223b95e6c3b7/sandbox/darwin-sandbox/1117/execroot/jazzer/bazel-out/darwin_arm64-opt/bin/examples/ExampleFuzzerWithUBSan.runfiles/fmeum_rules_jni/jni/tools/libjvm_stub/coverage/CoverageAgent.jar:: No such file or directory
singlejar_local: src/tools/singlejar/input_jar.cc:23: Cannot open input jar /private/var/tmp/_bazel_xyt/b041260c26ede733a242223b95e6c3b7/sandbox/darwin-sandbox/1117/execroot/jazzer/bazel-out/darwin_arm64-opt/bin/examples/ExampleFuzzerWithUBSan.runfiles/fmeum_rules_jni/jni/tools/libjvm_stub/coverage/CoverageAgent.jar: No such file or directory
OpenJDK 64-Bit Server VM warning: CriticalJNINatives specified, but not supported in this VM
INFO: Loaded 147 hooks from com.code_intelligence.jazzer.runtime.TraceCmpHooks
INFO: Loaded 4 hooks from com.code_intelligence.jazzer.runtime.TraceDivHooks
INFO: Loaded 2 hooks from com.code_intelligence.jazzer.runtime.TraceIndirHooks
INFO: Loaded 4 hooks from com.code_intelligence.jazzer.runtime.NativeLibHooks
INFO: Loaded 8 hooks from com.code_intelligence.jazzer.sanitizers.Deserialization
INFO: Loaded 5 hooks from com.code_intelligence.jazzer.sanitizers.ExpressionLanguageInjection
INFO: Loaded 70 hooks from com.code_intelligence.jazzer.sanitizers.LdapInjection
INFO: Loaded 50 hooks from com.code_intelligence.jazzer.sanitizers.NamingContextLookup
INFO: Loaded 1 hooks from com.code_intelligence.jazzer.sanitizers.OsCommandInjection
INFO: Loaded 48 hooks from com.code_intelligence.jazzer.sanitizers.ReflectiveCall
INFO: Loaded 8 hooks from com.code_intelligence.jazzer.sanitizers.RegexInjection
[rules_jni] Failed to collect coverage for native libraries:
java.lang.ClassNotFoundException: javax/com/github/fmeum/rules_jni/gen/jazzer_driver_2690633507
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at com.code_intelligence.jazzer.bootstrap.com.github.fmeum.rules_jni.CoverageHelper.callHelperMethod(CoverageHelper.java:160)
	at com.code_intelligence.jazzer.bootstrap.com.github.fmeum.rules_jni.CoverageHelper.initCoverage(CoverageHelper.java:39)
	at com.code_intelligence.jazzer.bootstrap.com.github.fmeum.rules_jni.RulesJni.loadLibrary(RulesJni.java:121)
	at com.code_intelligence.jazzer.bootstrap.com.github.fmeum.rules_jni.RulesJni.loadLibrary(RulesJni.java:93)
	at com.code_intelligence.jazzer.runtime.TraceDataFlowNativeCallbacks.<clinit>(TraceDataFlowNativeCallbacks.java:26)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at com.code_intelligence.jazzer.api.Jazzer.<clinit>(Jazzer.java:49)
	at com.code_intelligence.jazzer.sanitizers.RegexRoadblocks.<clinit>(RegexRoadblocks.java:72)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at com.code_intelligence.jazzer.instrumentor.Hooks$Companion$HooksLoader.loadHooks(Hooks.kt:85)
	at com.code_intelligence.jazzer.instrumentor.Hooks$Companion$HooksLoader.load(Hooks.kt:67)
	at com.code_intelligence.jazzer.instrumentor.Hooks$Companion.loadHooks(Hooks.kt:61)
	at com.code_intelligence.jazzer.agent.Agent.install(Agent.kt:102)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.code_intelligence.jazzer.agent.AgentInstaller.install(AgentInstaller.java:59)
	at com.code_intelligence.jazzer.driver.FuzzTargetRunner.<clinit>(FuzzTargetRunner.java:55)
	at com.code_intelligence.jazzer.driver.Driver.start(Driver.java:88)
Did expect a crash, but Jazzer exited with exit code 1
--
Coverage runner: Not collecting coverage for failed test.
The following commands failed with status 1
/private/var/tmp/_bazel_xyt/b041260c26ede733a242223b95e6c3b7/sandbox/darwin-sandbox/1117/execroot/jazzer/bazel-out/darwin_arm64-opt/bin/examples/ExampleFuzzerWithUBSan.runfiles/jazzer/examples/ExampleFuzzerWithUBSan driver/jazzer_driver_ubsan agent/jazzer_api_deploy.jar examples/ExampleFuzzerWithUBSan_target_deploy.jar  True False True  --jvm_args=-Djazzer.native_lib=native_ubsan

In jazzer/bazel-out/darwin_arm64-opt/bin/examples/ExampleFuzzerWithASan.runfiles/fmeum_rules_jni/jni/tools/libjvm_stub/coverage/ ,just have a coverage_deploy.jar,so it build failed.

[fmeum]

Jazzer is unfortunately a bit of a tricky case as it contains two shaded copies of rules_jni and appends a jar using it to the bootstrap classpath. We are currently working on simplifying the architecture further. When that is done, I will look into whether this use case is still broken.

If what you are really interested in is fuzz test coverage, I would instead guide you to use https://github.com/bazelbuild/rules_fuzzing, to which I intend to add Java coverage soon after the Jazzer refactoring is done.