2c - just hit this myself on xenail s390x with a soaking openstack-on- lxd installation.
masking proc-sys-fs-binfmt_misc.automount seemed to be a bad idea... systemd is in a bad state.. ubuntu@zs93kvi:~$ 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 systemd-binfmt.service loaded inactive dead Set Up Additional Binary Formats ubuntu@zs93kvi:~$ sudo systemctl mask proc-sys-fs-binfmt_misc.automount Created symlink from /etc/systemd/system/proc-sys-fs-binfmt_misc.automount to /dev/null. ubuntu@zs93kvi:~$ Broadcast message from systemd-journald@zs93kvi (Fri 2017-05-05 10:25:46 EDT): systemd[1]: Caught <ABRT>, dumped core as pid 23484. Broadcast message from systemd-journald@zs93kvi (Fri 2017-05-05 10:25:46 EDT): systemd[1]: Freezing execution. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1555760 Title: Too many levels of symbolic links /proc/sys/fs/binfmt_misc To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/binfmt-support/+bug/1555760/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs