And that's unfortunately only an issue because Linux doesn't implement POSIX's model for thread privileges. In particular, glibc has to implement the nptl in us

And that's unfortunately only an issue because Linux doesn't implement POSIX's model for thread privileges. In particular, glibc has to implement the nptl in userspace to make Linux threads look like POSIX threads. I get the feeling that the Go runtime doesn't do the same.