How to install php debug symbols on Debian Buster?

Question

I am trying to obatin a meaningful backtrace for some segmentation faults occuring on php-fpm in Debian Buster. Reading Debian's guide , I understand that

1. I need to add the debug repo deb http://deb.debian.org/debian-debug/ buster-debug main
2. I need to install debian-goodies so that I can search my debug symbols package with find-dbgsym-packages

But it seems that the php debug symbols are missing from the output of find-dbgsym-packages /usr/bin/php , these are the packages listed:

• libargon2-1-dbgsym
• libgcc1-dbg
• libicu63-dbgsym
• liblzma5-dbgsym
• libpcre2-dbg
• libsodium23-dbgsym
• libssl1.1-dbgsym
• libstdc++6-8-dbg
• libxml2-dbg
• php7.3-cli-dbgsym
• zlib1g-dbg

I was excpecting to find a package like php7.3-dbgsym ... what I am missing?

Answer 1

I was excpecting to find a package like php7.3-dbgsym... what I am missing?

You are missing that the debug symbols you need are included in php7.3-cli-dbgsym .

Install all of the packages find-dbgsym-packages finds and analyze your core again.

Answer 2

It seems that you can add an automatic downloader now:

https://wiki.debian.org/HowToGetABacktrace#Automatically_loading_debugging_symbol_from_the_Internet

Just type this in your console:

export DEBUGINFOD_URLS="https://debuginfod.debian.net"

Then run your PHP script:

$ gdb -args /usr/bin/php my_faulty_script.php
(gdb) run
...
(wait for the crash)
...
(gdb) bt