Linus argument is that use of debuggers may contribute to bad design, but he does not prohibit their use. As Linus was not the core contributor to cgroups (Goog

Linus argument is that use of debuggers may contribute to bad design, but he does not prohibit their use. As Linus was not the core contributor to cgroups (Google was) and kernel debugging certainly was available when cgroups was first implemented, I would say the opposite might actually be true. Personally, I think the UNIX OS design is a poor fit for the requirements of Docker et al. The problems with cgroups should be a signal that it breaks the fundamental design assumptions of Linux (doing fundamental resource separation and multi-ring security in a monolithic kernel).