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

[Stéphane Graber]

root at castiana:~# systemctl status proc-sys-fs-binfmt_misc.mount
● proc-sys-fs-binfmt_misc.mount - Arbitrary Executable File Formats File System
   Loaded: loaded (/lib/systemd/system/proc-sys-fs-binfmt_misc.mount; static; vendor preset: enabled)
   Active: inactive (dead) since Sat 2016-03-12 13:21:58 EST; 3 days ago
    Where: /proc/sys/fs/binfmt_misc
     What: binfmt_misc
     Docs: https://www.kernel.org/doc/Documentation/binfmt_misc.txt
           http://www.freedesktop.org/wiki/Software/systemd/APIFileSystems

Mar 11 00:56:08 castiana systemd[1]: Mounting Arbitrary Executable File Formats File System...
Mar 11 00:56:08 castiana systemd[1]: Mounted Arbitrary Executable File Formats File System.
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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