slow stat in smartos after usermod

readme.md

Stat'ing my home directory normally:

$ echo $USER
dave
$ ptime stat /home/dave >/dev/null

real        0.004714407
user        0.000784144
sys         0.002977563

Stat'ing my home directory immediately after a usermod command to add "dave" to the "sudo" group:

$ sudo usermod -G sudo dave; ptime stat /home/dave >/dev/null
UX: usermod: dave is currently logged in, some changes may not take effect until next login.

real        2.004824117
user        0.000815895
sys         0.002932341

Same command as above, but instead waiting 3 seconds after the usermod to run stat:

$ sudo usermod -G sudo dave; sleep 3; ptime stat /home/dave >/dev/null
UX: usermod: dave is currently logged in, some changes may not take effect until next login.

real        0.003154489
user        0.000456484
sys         0.001905049

Finally, with name-service-cache disabled

$ sudo svcadm disable name-service-cache
$ sudo usermod -G sudo dave; ptime stat /home/dave >/dev/null
UX: usermod: dave is currently logged in, some changes may not take effect until next login.

real        0.005278725
user        0.001024852
sys         0.003341564