I had the same kthread_parkme warning on many machines I tested with 4.17.0-rc6-00158-gbee797529d7c (x86, amd64, sparc, parisc, alpha).
Your patch https://lkml.org/lkml/2018/5/4/212 fixed the problem for me. Sorry for off-thread respnse, I found your mail from the web only. -- Meelis Roos ([email protected])
