Help with systemd/cgroup task limits in koji

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Greetings.

We are running into some anoying limits on koji builds of chromium.

First, since a long time ago, the koji.service file we are using has:

TasksMax=infinity

But yet, chromium was failing, seemingly hitting a task limit.
"ninja: fatal: posix_spawn: Resource temporarily unavailable"
in the build and:
"kernel: cgroup: fork rejected by pids controller in
/machine.slice/machine-7d12b2e6dcfb4230b04d2c2c0b499171.scope/payload"
on the builder.

Investigation and some help from folks in the #devel room
(many thanks glb!)
Showed that the systemd-nspawn container mock started has:

systemctl show systemd-nspawn@0b3f01a2a8e345a389b30c477812c471
TasksMax=16384

So, I put in place a:
/etc/systemd/system/systemd-nspawn@.service.d/override.conf
with:

[Service]
TasksMax=infinity

and that seemed to be used for the mock systemd-nspawn containers.

However, the builds with lots of cpus is now failing later with:

Error: spawn /usr/bin/node-18 EAGAIN
    at Process.ChildProcess._handle.onexit
(node:internal/child_process:283:19)
    at onErrorNT (node:internal/child_process:476:16)
    at processTicksAndRejections (node:internal/process/task_queues:82:21)
[!] Error: unfinished hook action(s) on exit:

Is there yet another layer here that has another limit?

Is there anything here I can set that says "infinity all the way down' ?

Assistance welcome. I can file a systemd bug, but I am not sure
this is a bug more than a lack of documentation.

Thanks!

kevin

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