For what it's worth, I just repeated that test.  The timings are suspiciously 
similar.  This is very definitely a reproducible bug:

zfs unmount rc-pool/zfscachetest
zfs mount rc-pool/zfscachetest

Doing initial (unmount/mount) 'cpio -o > /dev/null'
48000247 blocks

real    4m45.69s
user    0m10.22s
sys     0m53.29s

Doing second 'cpio -o > /dev/null'
48000247 blocks

real    15m47.48s
user    0m10.58s
sys     1m10.96s
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