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

[Stéphane Graber]

Not having much success reproducing this on a clean machine. In the mean
time, I figured I'd fix my laptop and try to see what changes after a
restart:

root at castiana:~# ls -lh /proc/sys/fs/binfmt_misc/
ls: cannot access '/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 restart proc-sys-fs-binfmt_misc.automount

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:~# ls -lh /proc/sys/fs/binfmt_misc/
total 0
-rw-r--r-- 1 root root 0 Mar 11 00:56 python2.7
-rw-r--r-- 1 root root 0 Mar 11 00:56 python3.5
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-aarch64
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-alpha
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-arm
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-armeb
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-cris
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-m68k
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-microblaze
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-mips
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-mips64
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-mips64el
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-mipsel
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-ppc
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-ppc64
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-ppc64abi32
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-ppc64le
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-s390x
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-sh4
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-sh4eb
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-sparc
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-sparc32plus
-rw-r--r-- 1 root root 0 Mar 11 00:56 qemu-sparc64
--w------- 1 root root 0 Mar 11 00:56 register
-rw-r--r-- 1 root root 0 Mar 11 00:56 status
root at castiana:~# 

So as far as one can tell from the kernel, nothing changed...

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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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