Update to latest commit on github:
Chase FreeBSD base commit r338318: Eliminate the arena parameter to kmem_free(). The FreeBSD commit was made to correct an error in the function hypercall_memfree(), where the wrong arena was being passed to kmem_free(). Obtained from: https://svnweb.freebsd.org/changeset/base/338318
Reviewed by: mat@, jmd@
Approved by: jmd@ (maintainer)
MFH: 2018Q3
Differential Revision: https://reviews.freebsd.org/D16916