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> The problem where the people who just switched to Ubuntu 16 are hitting problems with high-end database servers, middleware, containers, large builds, and so forth all running out of threads because of another systemd default that was switched by its developers, is still quietly on-going.

That's evil. Thanks for pointing that out. Terrible to debug, poorly documented and funny side effects you don't immediately think off. That fork bomb reasoning for the change is also sketchy as if you have local privilege you can DoS the machine in a lot of other ways (cpuburn, filling the disk, hogging memory and causing swap of death). If you run a public SSH server you likely already used cgroups and other measures to prevent fork bombs.

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