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Re: kern/51393: Reproducible KASSERT in UVM

The following reply was made to PR kern/51393; it has been noted by GNATS.

From: Michael van Elst <>
Subject: Re: kern/51393: Reproducible KASSERT in UVM
Date: Wed, 16 Aug 2017 00:42:40 +0200

 The address hint is passed through round_page() unless MAP_FIXED is set.
 A value of (void *)-1 is rounded up to 0.
 The assertion that a topdown allocation is below or equal to the "orig_hint"
 (== the rounded up and overflown value) doesn't hold in that case.
                                 Michael van Elst
                                 "A potential Snark may lurk in every tree."

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