ZFS: zpool scrub lockup

[Thomas Ronner]

Hello,

I don't know whether this is the right list; maybe freebsd-fs is more
appropriate. So please redirect me there if this isn't the right place.

My system (i386, Athlon XP) locks hard when scrubbing a certain pool. It
has been doing this for at least a couple of months now. For this reason
I upgraded to 7.2-STABLE recently as this had the latest ZFS bits, but
this doesn't help. It even makes the problem worse: in previous versions
I just hit the reset button and forgot about it, but now it "remembers"
that it was scrubbing (I presume) and tries to resume at the exact same
place, locking up again. This means I haven't been able to mount these
ZFS volumes successfully: the moment I do a /etc/rc.d/zfs start from
single user mode (I have my /, /var and /usr on UFS) it locks up in a
couple of seconds. And by locks up I really mean locks up. No panic,
nothing. Pressing the reset button on the chassis is the only way to
reboot. 

Details about my system:
Athlon XP 2400+
Asus K7V-880 (VIA chipset; 2 IDE, 2 SATA ports)
2 GB RAM
Promise Ultra133-TX2 (2 port IDE controller)
Promise SATA150 4 port SATA controller
Promise SATA300 4 port SATA controller
4 Maxtor 300 GB IDE disks
1 Maxtor 300 GB SATA disk
1 WD 320 GB SATA disk
6 Samsung 1 TB SATA disks

The Samsung disks form the pool I'm having trouble with. They are
connected to the Promise controllers.

Does anyone know how I can debug this? I'm not even sure whether it is a
software or a hardware problem. Any help is greatly appreciated!


Regards,
Thomas