Thanks! I cvsuppedd and rebuilt kernel.

falcon# uname -a FreeBSD falcon 9.0-CURRENT FreeBSD 9.0-CURRENT #3: Sun Mar 6 18:55:14 EST 2011
root@falcon:/usr/obj/usr/src/sys/GENERIC sparc64 falcon#

I did a kldload zfs and it loaded ok.

falcon# kldstat Id Refs Address Size Name 1 9 0xc0000000 e42878 kernel 2 1 0xc14a2000 32e000 zfs.ko 3 1 0xc17d0000 104000 opensolaris.ko falcon#

But a 'zpool status' or 'zfs list' will cause a zfs or zpool process to eat 99% of a cpu and essentially hang the shell i ran zfs/zpool in.

falcon# zfs list

ZFS NOTICE: Prefetch is disabled by default if less than 4GB of RAM is present;

to enable, add "vfs.zfs.prefetch_disable=0" to /boot/loader.conf.

ZFS filesystem version 5

ZFS storage pool version 28

[Hang here]

last pid: 1012; load averages: 0.79, 0.30, 0.16 up
0+00:13:58 20:58:43

23 processes: 2 running, 21 sleeping

CPU: 0.0% user, 0.0% nice, 52.5% system, 0.0% interrupt, 47.5% idle

Mem: 16M Active, 11M Inact, 46M Wired, 64K Cache, 12M Buf, 1915M Free

Swap: 4055M Total, 4055M Free

PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND

1006 root 1 53 0 21672K 2904K CPU1 1 0:05 99.47% zfs

998 root 1 40 0 41776K 6376K select 0 0:01 0.00% sshd

994 root 1 16 0 11880K 3536K pause 0 0:01 0.00% csh

795 root 1 40 0 16720K 3968K select 0 0:00 0.00% ntpd

1001 root 1 16 0 11880K 3464K pause 0 0:00 0.00% csh

975 root 1 8 0 25168K 2672K wait 1 0:00 0.00% login

stays at 99%.

truss -p 1006 doesn't "attach", it just hangs.

ctrl-t on the zfs list shell:

oad: 0.95 cmd: zfs 1006 [running] 182.26r 0.00u 4.66s 99% 2872k

load: 0.95 cmd: zfs 1006 [running] 183.30r 0.00u 4.66s 99% 2872k

load: 0.95 cmd: zfs 1006 [running] 183.76r 0.00u 4.66s 99% 2872k

load: 0.95 cmd: zfs 1006 [running] 184.08r 0.00u 4.66s 99% 2872k

load: 0.95 cmd: zfs 1006 [running] 184.36r 0.00u 4.66s 99% 2872k

A second time with zpool status:: last pid: 1224; load averages: 0.98, 0.55, 0.24
up 0+02:07:39 23:12:33 26 processes: 2 running, 24 sleeping CPU: 0.0% user, 0.0% nice, 50.2% system, 0.4% interrupt, 49.4% idle Mem: 18M Active, 13M Inact, 46M Wired, 64K Cache, 12M Buf, 1911M Free Swap: 4055M Total, 4055M Free

PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND 1200 root 1 62 0 22704K 2920K CPU1 1 0:00 99.02% zpool 793 root 1 40 0 16720K 3968K select 0 0:02 0.00% ntpd 1180 root 1 16 0 11880K 3536K pause 1 0:01 0.00% csh 1184 root 1 40 0 41776K 6376K select 0 0:01 0.00% sshd 1201 root 1 40 0 41776K 6376K select 0 0:01 0.00% sshd

falcon# truss -p 1200 truss: can not attach to target process: Device busy falcon# truss -p 1200 truss: can not attach to target process: Device busy falcon#

ctrl-t on the zpool status command: load: 0.62 cmd: zpool 1200 [running] 54.30r 0.00u 0.07s 83% 2888k load: 0.99 cmd: zpool 1200 [running] 271.73r 0.00u 0.07s 99% 2888k load: 0.99 cmd: zpool 1200 [running] 272.37r 0.00u 0.07s 99% 2888k load: 0.99 cmd: zpool 1200 [running] 272.75r 0.00u 0.07s 99% 2888k load: 0.99 cmd: zpool 1200 [running] 273.38r 0.00u 0.07s 99% 2888k

truss -f zpool status::

1014: sigprocmask(SIG_SETMASK,0x0,0x0) = 0 (0x0) 1014:
sigprocmask(SIG_BLOCK,SIGHUP|SIGINT|SIGQUIT|SIGKILL|SIGPIPE|SIGALRM|SIGTERM|SIGURG|SIGSTOP|SIGTSTP|SIGCONT|SIGCHLD|SIGTTIN|SIGTTOU|SIGIO|SIGXCPU|SIGXFSZ|SIGVTALRM|SIGPROF|SIGWINCH|SIGINFO|SIGUSR1|SIGUSR2,0x0)
= 0 (0x0) 1014: sigprocmask(SIG_SETMASK,0x0,0x0) = 0 (0x0) 1014:
sigprocmask(SIG_BLOCK,SIGHUP|SIGINT|SIGQUIT|SIGKILL|SIGPIPE|SIGALRM|SIGTERM|SIGURG|SIGSTOP|SIGTSTP|SIGCONT|SIGCHLD|SIGTTIN|SIGTTOU|SIGIO|SIGXCPU|SIGXFSZ|SIGVTALRM|SIGPROF|SIGWINCH|SIGINFO|SIGUSR1|SIGUSR2,0x0)
= 0 (0x0) 1014: sigprocmask(SIG_SETMASK,0x0,0x0) = 0 (0x0) 1014: modfind(0x40d3f140,0x9a0,0xc78,0x10a,0x1027e8,0x7fdffffe8d0) = 303
(0x12f) 1014: open("/dev/zfs",O_RDWR,06170) = 3 (0x3) 1014: open("/dev/zero",O_RDONLY,0666) = 4 (0x4) 1014: open("/etc/zfs/exports",O_RDONLY,0666) ERR#2 'No such file or
directory' 1014: __sysctl(0x7fdffff8de8,0x2,0x7fdffff8eb0,0x7fdffff8f18,0x40d3f118,0x13) =
0 (0x0) 1014: __sysctl(0x7fdffff8eb0,0x4,0x40e4d084,0x7fdffff8fe0,0x0,0x0) = 0 (0x0) [hang] ctrl-t

load: 0.31 cmd: zpool 1014 [running] 12.47r 0.00u 0.07s 44% 2912k

1014 root 1 54 0 22704K 2944K CPU0 0 0:00 98.47% zpool

falcon# truss -p 1014 truss: can not attach to target process: Device busy

iostat -x 1 shows no reads and no writes to any disks

There's a 2-disk zfs mirror attached to this ultra60 from a freebsd-8 install,
but I don't know why that would cause a problem with the latest zfs v28.