[Bug 1555760] Re: Too many levels of symbolic links /proc/sys/fs/binfmt_misc

[Stéphane Graber]

stgraber at dakara:~$ rssh castiana.lan.mtl
root at castiana:~# ls -lh /proc/sys/fs/binfmt_misc
ls: cannot open directory '/proc/sys/fs/binfmt_misc': Too many levels of symbolic links
root at castiana:~# cat /proc/mounts | grep binfmt
systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=29,pgrp=1,timeout=0,minproto=5,maxproto=5,direct 0 0
root at castiana:~# systemctl -a | grep binfmt
  proc-sys-fs-binfmt_misc.automount                                                                       loaded    active   running   Arbitrary Executable File Formats File System Automount Point
  proc-sys-fs-binfmt_misc.mount                                                                           loaded    inactive dead      Arbitrary Executable File Formats File System
  binfmt-support.service                                                                                  loaded    active   exited    Enable support for additional executable binary formats
  systemd-binfmt.service                                                                                  loaded    inactive dead      Set Up Additional Binary Formats
root at castiana:~#

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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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