Comment # 4 on bug 1203713 from Takashi Iwai

Are you running NFS server?  If yes, it's likely a bug of sunrpc that has been
already fixed in the latest SLE15-SP4 git branch (bsc#1203630).

Please check the behavior with the latest SLE15-SP4 kernel git build, available
in OBS Kernel:SLE15-SP4 repo:
  http://download.opensuse.org/repositories/Kernel:/SLE15-SP4/pool/