Comment 2 for bug 2068702

It happens on jammy kernel, which launchpad builder uses. So likely you are running docker on some old kernels.

I think it happens when the kernel doesn't implemented close_range syscall.

However I haven't figured out why calling close_range will cause the process to hang.

More interestingly, I find the faked process becomes zombie state when run inside a subshell, as the fakeroot tests use.