Could somebody look at PR216178?

[Lev Serebryakov]

 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216178

 I could reproduce it on 10-STABLE and 11-STABLE and I'm afraid, that
this ruin ARC and L2ARC efficiency completely.

-- 
// Lev Serebryakov

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