Hi, In version 228, systemd introduced a unit attribute `TasksMax`[1] that limits the number of tasks that can run in a unit. It has effect on kernel versions 4.3 and up, kernel threads and userspace process count towards the limit, and the default value is 512.
Running `guix pull` without changing any settings crashed for me, because building/testing texinfo hit this task limit. Increasing it to 1024 using `systemctl set-property guix-daemon.service TasksMax=1024` fixed the problem. Because I expect guix-daemon to hit this limit regularly, it might be wise to set a higher `TasksMax` in the service file itself, perhaps even `infinity`. Doing this would, sadly, cause older systemd versions shipped by various distributions to complain about the existence of the attribute, so perhaps a mention in the manual would instead be enough. [1]: https://www.freedesktop.org/software/systemd/man/systemd.resource-control.html#TasksAccounting= -- Joram
