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

[Eric Desrochers]

I don't have the error "Too many levels of symbolic links" when doing an
"ls" command but I do have a problem using "df" on Xenial after
installing Openstack with lxd using "conjure-up"

"df" works fine, but after a reboot, it hangs.

A "strace df" shows that it hangs at doing :
..
stat("/sys/fs/cgroup/memory", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/hugetlb", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/cpuset", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/proc/sys/fs/binfmt_misc", 

$ 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 2016-06-25 16:54:21 EDT; 9min 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
  Process: 6247 ExecMount=/bin/mount binfmt_misc /proc/sys/fs/binfmt_misc -t binfmt_misc (code=exited, status=0/SUCCESS)

Jun 25 16:54:21 <HOST> systemd[1]: Mounting Arbitrary Executable File Formats File System...
Jun 25 16:54:21 <HOST> systemd[1]: Mounted Arbitrary Executable File Formats File System.
Jun 25 16:54:22 <HOST> systemd[1]: proc-sys-fs-binfmt_misc.mount: Start request repeated too quickly.
Jun 25 16:54:22 <HOST> systemd[1]: Failed to mount Arbitrary Executable File Formats File System.


My workaround is to perform the following command at every reboot :
$ sudo dpkg-reconfigure binfmt-support

Eric

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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:
  Confirmed
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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