Cloning this bugreport since the original bugreport is not available for
everyone. There is no reason to expect a different behaviour on any
systemd-based openSUSE system.

+++ This bug was initially created as a clone of Bug #963790 +++

On SLES12 SP1 (I guess SLES12 GA had the same problem after an rollback,
boot.fglrxrebuild always fails with the following error:

fglrxrebuild.service - LSB: Automatically rebuild the fglrx kernel module
   Loaded: loaded (/etc/init.d/boot.fglrxrebuild)
   Active: failed (Result: exit-code) since Wed 2016-01-27 14:53:18 CET; 3min
58s ago
  Process: 833 ExecStart=/etc/init.d/boot.fglrxrebuild start (code=exited,
status=1/FAILURE)

Jan 27 14:53:18 linux-exg7 boot.fglrxrebuild[833]:
/etc/init.d/boot.fglrxrebuild: line 152: /var/log/fglrx-build.log: Permission
denied
Jan 27 14:53:18 linux-exg7 boot.fglrxrebuild[833]:
/etc/init.d/boot.fglrxrebuild: line 155: /var/log/fglrx-build.log: Permission
denied
Jan 27 14:53:18 linux-exg7 boot.fglrxrebuild[833]: FATAL: The fglrx kernel
module could not be built!
Jan 27 14:53:18 linux-exg7 boot.fglrxrebuild[833]: /usr/bin/sed: can't read
/var/log/fglrx-build.log: No such file or directory
Jan 27 14:53:18 linux-exg7 boot.fglrxrebuild[833]: Check for the fglrx kernel
module is running...
Jan 27 14:53:18 linux-exg7 boot.fglrxrebuild[833]: The fglrx kernel module is
not loaded! Try it to modprobe now ...
Jan 27 14:53:18 linux-exg7 boot.fglrxrebuild[833]: modprobe: FATAL: Module
fglrx not found.
Jan 27 14:53:18 linux-exg7 boot.fglrxrebuild[833]: FATAL: The fglrx kernel
module could not loaded!
Jan 27 14:53:18 linux-exg7 boot.fglrxrebuild[833]: ..failed
Jan 27 14:53:18 linux-exg7 systemd[1]: Failed to start LSB: Automatically
rebuild the fglrx kernel module.

/var/log is a btrfs subvolume, looks like boot.fglrxrebuild is already running
before subvolumes are mounted?