IssueTracker

After getting copies of Github's runner images, and simulating the environment in a docker image- I've managed to reproduce the issue. This occurs when the CPUs are limited to 2 cores; as is the case with standard github runner machines. It seems to be a deadlock. Logging into the deadlocked container, I've managed to get stack traces.

Relevant Running Processes:

root         205     199  1 20:12 pts/1    00:00:13 /opt/hostedtoolcache/Java_Zulu_jdk/11.0.18-10/x64/bin/java -Xmx64m -Xms64m -Dorg.gradle.appname=gradlew -classpath /usr/local/google/home/daymxn/Documents/repos/firebase-android-sdk/gradle/wrapper/gradle-wrapper.jar org.gradle.wrapper.GradleWrapperMain --no-daem
on :firebase-common:kotlindoc

root         241     205 25 20:13 ?        00:05:42 /opt/hostedtoolcache/Java_Zulu_jdk/11.0.18-10/x64/bin/java -XX:MaxPermSize=8g --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UN
NAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED -Xms2g -Xmx8g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /root/.gradle/wrapper/dists/gradle-7.6-all/9f832ih6bniajn45pbmq
hk2cw/gradle-7.6/lib/gradle-launcher-7.6.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 7.6

root         343     241  3 20:14 ?        00:00:39 /opt/hostedtoolcache/Java_Zulu_jdk/11.0.18-10/x64/bin/java -cp /root/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-compiler-embeddable/1.7.10/909803167c98606fcf22b4c848647c68e351d48d/kotlin-compiler-embeddable-1.7.10.jar:/root/.gradle/caches/mod
ules-2/files-2.1/org.jetbrains.kotlin/kotlin-reflect/1.7.10/165e600dfea6185cf5efa700756294cc4904dbeb/kotlin-reflect-1.7.10.jar:/root/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.7.10/d2abf9e77736acc4450dc4a3f707fa2c10f5099d/kotlin-stdlib-1.7.10.jar:/root/.gradle/caches/modules-2/files-2
.1/org.jetbrains.kotlin/kotlin-script-runtime/1.7.10/c99c87a6988d8fd8d5142e9ed5c9f34a7cf561ee/kotlin-script-runtime-1.7.10.jar:/root/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-daemon-embeddable/1.7.10/3a9f7aef7080d3ae63126cbba4f827ed664f32fa/kotlin-daemon-embeddable-1.7.10.jar:/root/.gradle/ca
ches/modules-2/files-2.1/org.jetbrains.intellij.deps/trove4j/1.0.20200330/3afb14d5f9ceb459d724e907a21145e8ff394f02/trove4j-1.0.20200330.jar:/root/.gradle/caches/modules-2/files-2.1/net.java.dev.jna/jna/5.6.0/330f2244e9030119ab3030fc3fededc86713d9cc/jna-5.6.0.jar:/root/.gradle/caches/modules-2/files-2.1/org.jetbra
ins.kotlin/kotlin-stdlib-common/1.7.10/bac80c520d0a9e3f3673bc2658c6ed02ef45a76a/kotlin-stdlib-common-1.7.10.jar:/root/.gradle/caches/modules-2/files-2.1/org.jetbrains/annotations/13.0/919f0dfe192fb4e063e7dacadee7f8bb9a2672a9/annotations-13.0.jar -Djava.awt.headless=true -D$java.rmi.server.hostname=127.0.0.1 -Xmx8
g -Dkotlin.environment.keepalive -ea org.jetbrains.kotlin.daemon.KotlinCompileDaemon --daemon-runFilesPath /root/.local/share/kotlin/daemon --daemon-autoshutdownIdleSeconds=7200 --daemon-compilerClasspath /root/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-compiler-embeddable/1.7.10/909803167c986
06fcf22b4c848647c68e351d48d/kotlin-compiler-embeddable-1.7.10.jar:/root/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-reflect/1.7.10/165e600dfea6185cf5efa700756294cc4904dbeb/kotlin-reflect-1.7.10.jar:/root/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.7.10/d2abf9e77736ac
c4450dc4a3f707fa2c10f5099d/kotlin-stdlib-1.7.10.jar:/root/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-script-runtime/1.7.10/c99c87a6988d8fd8d5142e9ed5c9f34a7cf561ee/kotlin-script-runtime-1.7.10.jar:/root/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-daemon-embeddable/1.7.10/3a9
f7aef7080d3ae63126cbba4f827ed664f32fa/kotlin-daemon-embeddable-1.7.10.jar:/root/.gradle/caches/modules-2/files-2.1/org.jetbrains.intellij.deps/trove4j/1.0.20200330/3afb14d5f9ceb459d724e907a21145e8ff394f02/trove4j-1.0.20200330.jar:/root/.gradle/caches/modules-2/files-2.1/net.java.dev.jna/jna/5.6.0/330f2244e9030119
ab3030fc3fededc86713d9cc/jna-5.6.0.jar:/root/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.7.10/bac80c520d0a9e3f3673bc2658c6ed02ef45a76a/kotlin-stdlib-common-1.7.10.jar:/root/.gradle/caches/modules-2/files-2.1/org.jetbrains/annotations/13.0/919f0dfe192fb4e063e7dacadee7f8bb9a2672a9
/annotations-13.0.jar

root         411     241  1 20:17 ?        00:00:19 /opt/hostedtoolcache/Java_Zulu_jdk/11.0.18-10/x64/bin/java -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /root/.gradle/caches/modules-2/files-2.1/com.google.devsite/dackka-fat/10.10.12/5e0c3f42dd2a1b638dcbda274bcad90dcc3d11a5/dackka-
fat-10.10.12.jar org.jetbrains.dokka.MainKt /tmp/dackkaArgs2855163529207012510.json -loggingLevel DEBUG

Extended Thread dumps (Internal links for gpaste):

PID 205

PID 241

PID 343

PID 411

Extended Thread dumps (External links for gist):

PID 205

PID 241

PID 343

PID 411

Dokka issue: https://github.com/Kotlin/dokka/issues/2926

While the underlying issue is still present, it should no longer occur in GH CI since GitHub has increased the cores on their ubuntu machines.

I'll leave this bug open to track the underlying issue.

Bugjuggler: https://github.com/Kotlin/dokka/issues/2926

Bugjuggler: https://github.com/Kotlin/dokka/issues/2926 -> asfalcone@google.com