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<p>Hi Suresh,</p>
<p>Thanks for the bug report. I have created
<a class="moz-txt-link-freetext" href="https://bugs.openjdk.org/browse/JDK-8352775">https://bugs.openjdk.org/browse/JDK-8352775</a> to track this issue.</p>
<p>This issue is new in JDK 25 EA and does not affect JDK 24.</p>
<p>Please see my comments below</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 3/21/25 9:51 PM, Suresh G wrote:<br>
</div>
<blockquote type="cite" cite="mid:CAATb9L1BgJ1Ymun5aKEdjD5heu+UukxJAnpG-jJLWqK_=PxLrQ@mail.gmail.com">
<div dir="ltr">
<div class="gmail_default" style="color:#000000"><span style="color:rgb(34,34,34)">Hello Leyden Team,</span></div>
<div class="gmail_quote gmail_quote_container">
<div dir="ltr"><br>
I'm currently testing the new AOT cache feature with the
latest OpenJDK 25 EA builds. My setup is straightforward,
aiming to create a Docker image with the AOT cache, much
like I did previously with AppCDS.<br>
<br>
Here is the docker multi-stage build for my sample Hello
world app<br>
<br>
- Using openjdk:25-slim (25-ea+15-1670)<br>
- Compiling and creating app.jar<br>
- Getting module deps<br>
jdeps -q \<br>
-R \<br>
--ignore-missing-deps \<br>
--print-module-deps \<br>
--multi-release=25 \<br>
*.jar > ${APP_DIR}/java.modules<br>
<br>
- Creating jlinked image<br>
$JAVA_HOME/bin/jlink \<br>
--verbose \<br>
--module-path ${JAVA_HOME}/jmods \<br>
--add-modules="$(cat ${APP_DIR}/java.modules)" \<br>
--compress=zip-9 \<br>
--strip-debug \<br>
--strip-java-debug-attributes \<br>
--no-man-pages \<br>
--no-header-files \<br>
--save-opts "${APP_DIR}/jlink.opts" \<br>
--output ${RUNTIME_IMAGE}<br>
<br>
- Creating AOT cache<br>
echo "AOT training run for the app..."<br>
nohup ${RUNTIME_IMAGE}/bin/java \<br>
--show-version \<br>
--enable-preview \<br>
-XX:+UnlockExperimentalVMOptions \<br>
-XX:+UseCompactObjectHeaders \<br>
-XX:AOTMode=record
-XX:AOTConfiguration=${APP_DIR}/app.aotconf \<br>
-jar ${APP_JAR} & \<br>
<br>
sleep 1 && \<br>
curl -fsSL --retry 5 --retry-delay 2 --retry-all-errors
<a href="http://localhost/test" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">http://localhost/test</a><br>
curl -fsSL <a href="http://localhost/shutdown" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">http://localhost/shutdown</a>
|| echo "AOT training run completed!"<br>
<br>
echo "Creating AOT archive..."<br>
${RUNTIME_IMAGE}/bin/java \<br>
--show-version \<br>
--enable-preview \<br>
-XX:+UnlockExperimentalVMOptions \<br>
-XX:+UseCompactObjectHeaders \<br>
-XX:AOTMode=create
-XX:AOTConfiguration=${APP_DIR}/app.aotconf
-XX:AOTCache=${APP_DIR}/app.aot \<br>
-jar ${APP_JAR}<br>
<br>
- Now copy the APP_DIR to a distroless container (Final
image)<br>
---------------------------------------------------------------<span class="gmail_default" style="color:rgb(0,0,0)">---------------------</span><br>
<br>
I'm experiencing the following issues with the current
build.<br>
<br>
1. JVM crashes with ZGC enabled: <br>
#<br>
# A fatal error has been detected by the Java Runtime
Environment:<br>
#<br>
# SIGSEGV (0xb) at pc=0x0000000105b4f318, pid=13825,
tid=8963<br>
#<br>
# JRE version: (25.0+15) (build )<br>
# Java VM: OpenJDK 64-Bit Server VM (25-ea+15-1670,
interpreted mode, sharing, compressed class ptrs, z gc,
bsd-aarch64)<br>
# Problematic frame:<br>
# V [libjvm.dylib+0x47f318]
MetaspaceObjToOopHandleTable::set_oop(MetaspaceObj*,
oopDesc*)+0x78<br>
#<br>
# No core dump will be written. Core dumps have been
disabled. To enable core dumping, try "ulimit -c unlimited"
before starting Java again<br>
#<br>
#<br>
<br>
--------------- S U M M A R Y ------------<br>
<br>
Command Line: --enable-preview
-XX:+UnlockExperimentalVMOptions
-XX:+UseCompactObjectHeaders -XX:+UseZGC -XX:AOTMode=create
-XX: AOTConfiguration=app.aotconf -XX:AOTCache=app.aot
app.jar<br>
<br>
Host: "MacBookPro18,1" arm64, 10 cores, 32G, Darwin
23.6.0, macOS 14.6.1 (23G93)<br>
Time: Fri Mar 21 20:21:47 2025 PDT elapsed time:
0.044457 seconds (0d 0h 0m 0s)<br>
<br>
--------------- T H R E A D ---------------<br>
<br>
Current thread (0x0000000136808c00): JavaThread
"Unknown thread" [_thread_in_vm, id=8963,
stack(0x000000016bd84000, 0x000000016bf87000) (2060K)]<br>
<br>
Stack: [0x000000016bd84000,0x000000016bf87000],
sp=0x000000016bf86380, free space=2056k<br>
Native frames: (J=compiled Java code, j=interpreted,
Vv=VM code, C=native code)<br>
V [libjvm.dylib+0x47f318]
MetaspaceObjToOopHandleTable::set_oop(MetaspaceObj*,
oopDesc*)+0x78<br>
V [libjvm.dylib+0x2d1b38]
ConstantPool::restore_unshareable_info(JavaThread*)+0x20c<br>
V [libjvm.dylib+0xa52928]
vmClasses::resolve_all(JavaThread*)+0xe0<br>
V [libjvm.dylib+0x9a85cc]
SystemDictionary::initialize(JavaThread*)+0xa0<br>
V [libjvm.dylib+0xa0c8d0]
Universe::genesis(JavaThread*)+0x74<br>
V [libjvm.dylib+0xa0f570] universe2_init()+0x24<br>
V [libjvm.dylib+0x497dac] init_globals2()+0xc<br>
<br>
2. AOT Cache generation fails during Docker
cross-compilation: Specifically, running docker build with
--platform=linux/amd64<span class="gmail_default" style="color:rgb(0,0,0)"> </span>on ARM64 runner. <br>
<br>
36.70 + /opt/java/openjdk/bin/java --enable-preview
-XX:+UnlockExperimentalVMOptions
-XX:+UseCompactObjectHeaders -XX:AOTMode=create
-XX:AOTConfiguration=/app/app.aotconf
-XX:AOTCache=/app/app.aot -jar app.jar<br>
36.70 Creating AOT archive...<br>
36.77 Error occurred during initialization of VM<br>
36.77 Must be a valid AOT configuration generated by the
current JVM: /app/app.aotconf<br>
<br>
<br>
3. Also, are there plans to make the app.aotconf file
cross-platform compatible? This would allow us to generate
the configuration once, and then produce platform-specific
caches from that configuration in CI systems like GitHub
Actions. <br>
<br>
<br>
</div>
</div>
</div>
</blockquote>
<p>In JDK 25 and going forward, we are collecting execution profile
during AOT training. As a result, we have changed the AOT
configuration file to a binary file format that's tied to the
execution platform of the JVM. You can see more information from
<a class="moz-txt-link-freetext" href="https://bugs.openjdk.org/browse/JDK-8348426">https://bugs.openjdk.org/browse/JDK-8348426</a></p>
<p>The profile data is difficult to be represented in a
cross-platform format (e.g., a text file). The need for "cross
platform builds" has come up before in our design discussion. We
have decided to defer it and focus on delivering optimizations for
the most common use cases first. We might re-evaluate this
decision in the future when we have more user feedback (and more
time :-)</p>
<p>Thanks</p>
<p>- Ioi<br>
</p>
<br>
<blockquote type="cite" cite="mid:CAATb9L1BgJ1Ymun5aKEdjD5heu+UukxJAnpG-jJLWqK_=PxLrQ@mail.gmail.com">
<div dir="ltr">
<div class="gmail_quote gmail_quote_container">
<div dir="ltr">Thanks<br>
Suresh</div>
</div>
</div>
</blockquote>
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