Before I submit a PR, I was wondering if anyone can reproduce a panic
doing the following:

-- Use newfs_lfs to create a filesystem with a semgent size that is
not a multiple of the block and fragment sizes.  Segment size of
8805888 (this is for a ccd, in case you are wondering), block size of
32768, and frag size of 4096 are possible values that may work,
although I think the problem is using a segment size that is not a
multiple of the block and/or frag size.

2) Mount the filesystem.

At this point your system may panic, complaining of no free pmap entries.

Thanks for your input,

--Blair

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