I found a problem on 4-STABLE(maybe 5-CURRENT, too) with libc/db
        (BerkeleyDB 1).  It that when block size on fs is 65536 bytes,
        many programs which use BerkeleyDB(dev_mkdb, cap_mkdb, etc..) are
        crash.

        [REPLICATE THE TEST]
        # dd if=/dev/zero of=/dev/test.image bs=1m count=32
        # vnconfig -s labels -c /dev/vn0c /tmp/test.image
        # newfs -b 65536 -f 8192 /dev/vn0c
        # mount /dev/vn0c /mnt
        # dev_mkdb -f /mnt/dev.db /dev
        zsh: segmentation fault (core dumped)  dev_mkdb -f /mnt/dev.db /dev

        # umount /mnt
        # newfs -b 32768 -f 8192 /dev/vn0c
        # mount /dev/vn0c /mnt
        # dev_mkdb -f /mnt/dev.db /dev
        # ls -alF dev.db
        -rw-r--r--  1 root  wheel  32768 Sep 13 05:06 dev.db


        [ANALYSIS REPORT]
        Because of optimaization for fs, db/hash looks block size on specified
        file in src/lib/libc/db/hash/hash.c.  db/hash's block size limit is
        MAX_BSIZE(=65536) in if (hashp->BSIZE > MAX_BSIZE) ..... But, I can't
        understand others:-).

        I think db1 has boundary condition problems.

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