Shutdown problem with an USB memory stick as ZFS cache device

[Maurizio Vairani]

Hi all,


on a Compaq Presario laptop I have just installed the latest stable


#uname -a

FreeBSD presario 9.2-PRERELEASE FreeBSD 9.2-PRERELEASE #0: Tue Jul 16 
16:32:39 CEST 2013     root at presario:/usr/obj/usr/src/sys/GENERIC  amd64


For speed up the compilation I have added to the pool, tank0,  a SanDisk 
memory stick as cache device with the command:


# zpool add tank0 cache /dev/da0


But when I shutdown the laptop the process will halt with this screen shot:


http://www.dump-it.fr/freebsd-screen-shot/2f9169f18c7c77e52e873580f9c2d4bf.jpg.html


and I need to press the power button for more than 4 seconds to switch 
off the laptop.

The problem is always reproducible.


Regards

Maurizio