Hi, since some time i am having the following error on my hydra instance.

Everytime it does an evaluation it aborts with the following error in log:

Feb 24 17:00:38 tank nix-daemon[1579]: accepted connection from pid 6217, user hydra
Feb 24 17:00:38 tank hydra-evaluator[2106]: (config:.jobsets) Evaluating...
Feb 24 17:00:38 tank hydra-evaluator[2106]: error: stoi
Feb 24 17:00:38 tank hydra-evaluator[2106]: {UNKNOWN}: process ended prematurely at /nix/store/kvnp4qdk6bcg9j0pc8d87dgz6z5qklhl-hydra-0-unstable-2025-02-18/bin/.hydra-eval-jobset-wrapped line 404. at /nix/store/i85ni9bphygj6d31v68x24ncvhbc2vn6-hydra-perl-deps/lib/perl5/site_perl/5.40.0/Catalyst/Model/DBIC/Schema.pm line 526
Feb 24 17:00:38 tank hydra-evaluator[2078]: evaluation of jobset ‘config:.jobsets (jobset#1)’ failed with exit code 1

I am kinda out of ideas, the webserver runs fine.
I did play around a bit with the initd system (switched from scripted to systemd), if i remember correctly its kinda at the same time frame.
I noticed that there was a wrongly mapped uid for another service (which i fixed with chowning to the new id), but for hydra i did not find similar.
I also tried to reinstall hydra (nuke /var/lib/hydra and drop the database).
But all of that did not help.

I found an old issue relating to memory on that error, tho it confuses me as the machine has plenty of memory left unused and was capable to run my hydra builds before.
Has anyone an idea for me how to continue analying that issue?

edit: I found https://github.com/NixOS/hydra/issues/1437 that could be similar thing, at least the time range could fit, tho i am seing a different error text.

In reply to @hacker1024:matrix.org
There are only two places where nix-eval-jobs uses stoi. Have you set evaluator_workers or evaluator_max_memory_size in your Hydra configuration?