Provide debug symbols package for download

[holy-moly-555]

Is your feature request related to a problem?

Our application, running on corretto 11.0.16.8.1, shall be monitored with an APM Agent. For some features, this agent relies on the jvm async-profiler.

The profiler however requires one to have the jvm debug symbols installed. With openjdk runtimes, these can be easily installed through another package, e.g. the openjdk-11-dbg APT package. However, I couldn't find any information about debug symbols for corretto.

Clearly, these do not come with the corretto jdk package itself since gdb command outputs:

user@host:~/Downloads/amazon-corretto-11.0.16.9.1-linux-x64$ gdb bin/java
GNU gdb (Ubuntu 9.2-0ubuntu1~20.04.1) 9.2
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

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Reading symbols from bin/java...
(No debugging symbols found in bin/java)

Describe a solution you would like

I want to be able to download the debug symbols for the respective corretto version.
The SapMachine for example lets you download the debug symbols (they call them bin symbols) from their release page.

Describe alternatives you have considered

Building the jdk by my own as described here would be an alternative but in my opinion a very bad and user-unfriendly alternative.

Additional context

None.

[navyxliu]

hi, @holy-moly-555
We are still working on this. Meanwhile, here is the temporary debuginfo files for 11.0.16.9-1. hope this works for your site.

https://corretto-customer-share.s3.amazonaws.com/Corretto11/generic_linux/x64/11.0.16.9-1/amazon-corretto-debugsymbols-11.0.16.9.1-linux-x64.tar.tar?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIASDEBTSFUA7LQGD7O%2F20220829%2Fus-west-2%2Fs3%2Faws4_request&X-Amz-Date=20220829T195331Z&X-Amz-Expires=604800&X-Amz-SignedHeaders=host&X-Amz-Signature=ebf3508dab6116b60f7dfa5c1a4b79ab047e82dbbb9735da02d4219a98d5de80

[holy-moly-555]

Hi @navyxliu,

thanks for your reply and the temporary files. I will test the apm agent with them and come back to you afterwards.

I noticed that no .diz file is present in /lib/jli. Is this correct?

Kind regards.

[navyxliu]

It looks like we ditch that here. bug? We need to review this code snippet.

libjli is a trampoline. Do you need it to debug your code? the hotspot is libjvm.so

[alvdavi]

We should probably just grab every .diz with */**/*.diz

[holy-moly-555]

@navyxliu @alvdavi
Any news about this issue?
I still can not find the debug symbols on the release pages...

[apangin]

Hi @holy-moly-555,
If you ask about debug symbols for profiling, then you need nothing extra to install.

1. Corretto binaries already have symbols embedded. You may check it with
   nm /usr/java/amazon-corretto-11.0.19.7.1-linux-x64/lib/server/libjvm.so | grep _ZN
   This will print thousands of symbol names.
2. In any case, async-profiler does not require JVM debug symbols to work. In the worst case, profiles will have libjvm.so printed instead of JVM functions, but that's the only inconvenience in lack of debug symbols. As I mentioned above, this is not the issue with Corretto.

I guess the confusion is caused by the gdb message (No debugging symbols found in bin/java). The message is actually about debug info which is not the same as the symbol table required to display correct function names in the profiler output.

[holy-moly-555]

Hi @apangin,
thanks for the explanation. I can confirm that the profiling feature works on our AWS services running corretto.

@navyxliu @alvdavi I'll let you decide if the issue should get closed. My personal issue is solved.

Regards.