App crashing frequently throws "500" error - PHP Fatal error: Allowed memory size of 134217728 bytes exhausted

[SansGuidon]

my Shaarli app on Cloudron frequently throws 500 while loading the frontend.
everytime this occurs I see this in Shaarli log: Mar 04 14:40:58 [Tue Mar 04 13:40:58.352043 2025] [php:error] [pid 46] [client 172.18.0.1:36306] PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 9235624 bytes) in /app/code/application/bookmark/BookmarkIO.php on line 93

I tried to increase the memory limit via Cloudron allocated resources and php.ini without improvement.

I've also opened an issue in Shaarli repo: https://github.com/shaarli/Shaarli/issues/2130 because this I/O intensive operation for loading such a small DB (9K links) is unbelievable.
I know CLoudron hardcodes this memory limit : https://git.cloudron.io/packages/shaarli-app/-/blob/master/Dockerfile?ref_type=heads#L31 so I first thought that my changes made to php.ini were not taken into account. I wonder also how to double check if those are really taken into account?

Yet I also notice that Shaarli codebase contains a init.php file that hardcodes the memory limit to 128M : https://github.com/shaarli/Shaarli/blob/master/init.php#L18 so I also wonder if Cloudron php.ini makes sense.

Thanks for your help!

[girish]

@SansGuidon I can update PHP to 8.3 and see if that helps.

One angle is: shaarli runs with a memory limit at container level. apache spins out processes and each of this has a php limit. It is possible that if apache spins say 5 processes, then 5*128MB > container limit . So, can you try adjusting the app memory limit to say 800MB and checking if that helps ? If that's the case, we can also adjust the package to use a better default memory limit.

[SansGuidon]

Thank you @girish

I've already pushed the memory limit up to 1G yesterday without help
What I did try is to edit php.ini with something like

disable_functions = ini_set
auto_prepend_file = /app/data/init.php

and the init.php was a custom hack looking like

<?php
$original_ini_set = 'ini_set';
function ini_set($option, $value) {
    if ($option === 'memory_limit') {
        return false;
    }
    return call_user_func_array($GLOBALS['original_ini_set'], func_get_args());
}
call_user_func($original_ini_set, 'memory_limit', '512M');
error_log("Prepend file loaded and memory_limit set to " . ini_get('memory_limit'));

I don't recall all the different versions of the setting I've tried as it was passed midnight but at some point I could work around the hardcoded memory limit of 128M as defined in Shaarli init.php. Yet that didn't solve the root cause

but even if I could see an effective increase of memory limit used by Shaarli at runtime, so completely ignoring what was hardcoded in init.php , that didn't improve the situation

[SansGuidon]

@girish thanks for the package update, it might have improved the stability as despite sress testing the shaarli app after updating I didn't face the same error as before. I consider that if this resolves the problem it is a big victory, yet I prefer to not jump to conclusions for now, a good night is needed it the problem is not solved, I should soon get new alerts. Otherwise then I'll mark the issue as solved (hopefully)

[SansGuidon]

So far, no crash during the night . I'm now testing if lowering the memory allocated to this app by Cloudron will make things worse. Like going back to something like 256M instead of 1G.

[SansGuidon]

@girish As mentioned before, Shaarli hardcodes the memory limit in their init.php. I did not realize that Shaarli maintainer wasn't aware of that. Yet they suggest adjusting the way Cloudron packages Shaarli. https://github.com/shaarli/Shaarli/issues/2130#issuecomment-2726974132

Quoting the GitHub discussion:
@nodisc said in App frequently returns 500 error - PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (cloudron) #2130

@SansGuidon wow, I had no idea this was actually in the code (and always has been), and on my setup (apache+php-fpm) it doesn't have any effect (memory_limit stays at 256M), but I suspect it does with Cloudron's setup which still uses the deprecated apache2+mod_php setup.
Before moving forward, I suggest that cloudron's packaging should be modernized to use php-fpm + apache mpm-event which has many advantages

They suggest that we verify this by hacking the init.php of Shaarli and remove the ini_set but I can't do that as init.php is part of /app/code and I do not want to break Shaarli on my Cloudron

Any idea to move this forward?

[girish]

@SansGuidon I think it makes sense to move the package to php-fpm . We will look into that