[Bug 1543367] Re: nested unprileged container fails to start at mounting /proc

[Serge Hallyn]

Simplest way to reproduce:

sudo systemctl stop proc-sys-fs-binfmt_misc.automount # (just to be sure)
unshare -mpf
mount --make-rslave /
mount -t proc proc /proc
lxc-usernsexec
# mount -t proc proc /proc # permission denied, regardless what -o options may pass.

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https://bugs.launchpad.net/bugs/1543367

Title:
  nested unprileged container fails to start at mounting /proc

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