The issue isn't inside a container, for that matter lxd is completely
irrelevant here.

We're seeing that weird symlink loop happen randomly on xenial machines.
Normal users likely won't notice it though as they don't use that mountpoint, 
LXC users do though as LXC bind-mounts it into the container which fails 
miserably when it's an infinite loop of symlinks.

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https://bugs.launchpad.net/bugs/1555760

Title:
   Too many levels of symbolic links /proc/sys/fs/binfmt_misc

Status in binfmt-support package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  At first I thought this was an LXD issue, but it turns out the issue
  is in systemd

  https://github.com/lxc/lxd/issues/1727#issuecomment-194416558

  ls -l  /proc/sys/fs/binfmt_misc  fails with error:

  Too many levels of symbolic links

  
  I restarted binfmt manually by running:

      sudo /usr/sbin/update-binfmts --disable
      sudo /usr/sbin/update-binfmts --enable

  I think using systemd to do this would have also worked:

      sudo service binfmt-support restart

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