ZFS突然死の原因はやはりZFSのバグだった?

ZFS突然死の原因はやはりZFSのバグだった?/最初は、他の ZFS マシンは動いていたのでマシン固有の問題だと思っていたが/実際、メインルータは連続運転中/Filesystem:
3.1.5 Filesystem:

root@kx:~ # df -h
Filesystem Size Used Avail Capacity Mounted on
zroot/ROOT/default          1.3T    609M    1.3T     0%    /
devfs                       1.0K    1.0K      0B   100%    /dev
/dev/da0p4                  336G     20M    309G     0%    /bds
zroot/jails                 1.3T    180K    1.3T     0%    /jails
zroot/jails/backup 1.3T 42M 1.3T 0% /jails/backup
zroot/jails/basejail 1.3T 1.9G 1.3T 0% /jails/basejail
zroot/jails/commonjail 1.3T 36G 1.3T 3% /jails/commonjail
zroot/jails/desktop 1.3T 48G 1.3T 4% /jails/desktop
zroot/jails/mail 1.3T 2.0G 1.3T 0% /jails/mail
zroot/jails/newjail 1.3T 47M 1.3T 0% /jails/newjail
zroot/jails/ns 1.3T 1.9G 1.3T 0% /jails/ns
zroot/jails/web 1.3T 41M 1.3T 0% /jails/web
zroot/tmp                   1.3T     71M    1.3T     0%    /tmp
zroot/usr                   1.3T     26G    1.3T     2%    /usr
zroot/usr/home 1.3T 799M 1.3T 0% /usr/home
zroot/usr/local 1.3T 1.2G 1.3T 0% /usr/local
zroot/usr/ports 1.3T 922M 1.3T 0% /usr/ports
zroot/usr/src 1.3T 1.2G 1.3T 0% /usr/src
zroot/var                   1.3T     16M    1.3T     0%    /var
zroot/var/crash 1.3T 96K 1.3T 0% /var/crash
zroot/var/db 1.3T 45M 1.3T 0% /var/db
zroot/var/db/pkg 1.3T 6.1M 1.3T 0% /var/db/pkg
zroot/var/empty 1.3T 96K 1.3T 0% /var/empty
zroot/var/log 1.3T 1.1M 1.3T 0% /var/log
zroot/var/mail 1.3T 344K 1.3T 0% /var/mail
zroot/var/ports 1.3T 7.9G 1.3T 1% /var/ports
zroot/var/distfiles 1.3T 176K 1.3T 0% /var/ports/distfiles
zroot/var/packages 1.3T 96K 1.3T 0% /var/ports/packages
zroot/var/run 1.3T 204K 1.3T 0% /var/run
zroot/var/tmp 1.3T 604K 1.3T 0% /var/tmp
/jails/basejail 1.3T 1.9G 1.3T 0% /jails/ns/basejail
/usr/ports 1.3T 922M 1.3T 0% /jails/ns/basejail/usr/ports
/jails/commonjail 1.3T 36G 1.3T 3% /jails/ns/commonjail
/var/ports/distfiles 1.3T 176K 1.3T 0% \
    /jails/ns/commonjail/distfiles
/var/ports/packages 1.3T 96K 1.3T 0% \
    /jails/ns/commonjail/packages
/bds 336G 20M 309G 0% /jails/ns/bds
devfs 1.0K 1.0K 0B 100% /jails/ns/dev
fdescfs 1.0K 1.0K 0B 100% /jails/ns/dev/fd
procfs 4.0K 4.0K 0B 100% /jails/ns/proc
/jails/basejail 1.3T 1.9G 1.3T 0% /jails/web/basejail
/usr/ports 1.3T 922M 1.3T 0% /jails/web/basejail/usr/ports
/jails/commonjail 1.3T 36G 1.3T 3% /jails/web/commonjail
/var/ports/distfiles 1.3T 176K 1.3T 0% \
    /jails/web/commonjail/distfiles
/var/ports/packages 1.3T 96K 1.3T 0% \
    /jails/web/commonjail/packages
/bds 336G 20M 309G 0% /jails/web/bds
devfs 1.0K 1.0K 0B 100% /jails/web/dev
fdescfs 1.0K 1.0K 0B 100% /jails/web/dev/fd
procfs 4.0K 4.0K 0B 100% /jails/web/proc
/jails/basejail 1.3T 1.9G 1.3T 0% /jails/mail/basejail
/usr/ports 1.3T 922M 1.3T 0% /jails/mail/basejail/usr/ports
/jails/commonjail 1.3T 36G 1.3T 3% /jails/mail/commonjail
/var/ports/distfiles 1.3T 176K 1.3T 0% \
    /jails/mail/commonjail/distfiles
/var/ports/packages 1.3T 96K 1.3T 0% \
    /jails/mail/commonjail/packages
/bds 336G 20M 309G 0% /jails/mail/bds
devfs 1.0K 1.0K 0B 100% /jails/mail/dev
fdescfs 1.0K 1.0K 0B 100% /jails/mail/dev/fd
procfs 4.0K 4.0K 0B 100% /jails/mail/proc
/jails/basejail 1.3T 1.9G 1.3T 0% /jails/backup/basejail
/usr/ports 1.3T 922M 1.3T 0% /jails/backup/basejail/usr/ports
/jails/commonjail 1.3T 36G 1.3T 3% /jails/backup/commonjail
/var/ports/distfiles 1.3T 176K 1.3T 0% \
    /jails/backup/commonjail/distfiles
/var/ports/packages 1.3T 96K 1.3T 0% \
    /jails/backup/commonjail/packages
/bds 336G 20M 309G 0% /jails/backup/bds
devfs 1.0K 1.0K 0B 100% /jails/backup/dev
fdescfs 1.0K 1.0K 0B 100% /jails/backup/dev/fd
procfs 4.0K 4.0K 0B 100% /jails/backup/proc
/jails/basejail 1.3T 1.9G 1.3T 0% /jails/desktop/basejail
/jails/commonjail 1.3T 36G 1.3T 3% /jails/desktop/commonjail
/usr/src 1.3T 1.2G 1.3T 0% /jails/desktop/usr/src
/usr/ports 1.3T 922M 1.3T 0% /jails/desktop/usr/ports
/var/ports/distfiles 1.3T 176K 1.3T 0% \
    /jails/desktop/var/ports/distfiles
/var/ports/packages 1.3T 96K 1.3T 0% \
    /jails/desktop/var/ports/packages
/.dake 1.3T 609M 1.3T 0% /jails/desktop/.dake
linprocfs 4.0K 4.0K 0B 100% /jails/desktop/compat/linux/proc
devfs 1.0K 1.0K 0B 100% /jails/desktop/dev
fdescfs 1.0K 1.0K 0B 100% /jails/desktop/dev/fd
procfs 4.0K 4.0K 0B 100% /jails/desktop/proc
zroot/jails/backup/hosts 1.3T 88K 1.3T 0% /jails/backup/hosts
root@kx:~ #