Comment # 1 on bug 1129214 from Takashi Iwai

It looks like the page allocation stall from xfs_inode_alloc().  Its order is
0, so a really critical failure.

Adding both FS and MM people to Cc, who should have better clue.

Meanwhile, could you check whether the problem still happens with the latest
Leap 15.0 KOTD, available in OBS Kernel:openSUSE-15.0 repo, just to be sure?
  http://download.opensuse.org/repositories/Kernel:/openSUSE-15.0/standard/