FreeBSD 9-RELEASE zpool Out of File Descriptors ??

[Outback Dingo]

So it seems a new deployment we just built with zfsonroot mirror and a 48TB
master pool is already out of File Descriptors???

  pool: master
 state: ONLINE
status: The pool is formatted using a legacy on-disk format.  The pool can
        still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'.  Once this is done, the
        pool will no longer be accessible on software that does not support
feature
        flags.
  scan: none requested
config:

        NAME                      STATE     READ WRITE CKSUM
        master                    ONLINE       0     0     0
          raidz3-0                ONLINE       0     0     0
            multipath/SATA_LUN01  ONLINE       0     0     0
            multipath/SATA_LUN03  ONLINE       0     0     0
            multipath/SATA_LUN04  ONLINE       0     0     0
            multipath/SATA_LUN05  ONLINE       0     0     0
            multipath/SATA_LUN07  ONLINE       0     0     0
            multipath/SATA_LUN08  ONLINE       0     0     0
            multipath/SATA_LUN09  ONLINE       0     0     0
            multipath/SATA_LUN10  ONLINE       0     0     0
          raidz3-1                ONLINE       0     0     0
            multipath/SATA_LUN11  ONLINE       0     0     0
            multipath/SATA_LUN12  ONLINE       0     0     0
            multipath/SATA_LUN13  ONLINE       0     0     0
            multipath/SATA_LUN14  ONLINE       0     0     0
            multipath/SATA_LUN15  ONLINE       0     0     0
            multipath/SATA_LUN16  ONLINE       0     0     0
            multipath/SATA_LUN17  ONLINE       0     0     0
            multipath/SATA_LUN18  ONLINE       0     0     0
          raidz3-2                ONLINE       0     0     0
            multipath/SATA_LUN19  ONLINE       0     0     0
            multipath/SATA_LUN20  ONLINE       0     0     0
            multipath/SATA_LUN21  ONLINE       0     0     0
            multipath/SATA_LUN22  ONLINE       0     0     0
            multipath/SATA_LUN23  ONLINE       0     0     0
            multipath/SATA_LUN24  ONLINE       0     0     0
            multipath/SATA_LUN26  ONLINE       0     0     0
            multipath/SATA_LUN27  ONLINE       0     0     0
          raidz3-3                ONLINE       0     0     0
            multipath/SATA_LUN29  ONLINE       0     0     0
            multipath/SATA_LUN30  ONLINE       0     0     0
            multipath/SATA_LUN32  ONLINE       0     0     0
            multipath/SATA_LUN33  ONLINE       0     0     0
            multipath/SATA_LUN35  ONLINE       0     0     0
            multipath/SATA_LUN36  ONLINE       0     0     0
            multipath/SATA_LUN37  ONLINE       0     0     0
            multipath/SATA_LUN38  ONLINE       0     0     0
        logs
          multipath/SATA_LUN06    ONLINE       0     0     0
        cache
          multipath/SATA_LUN02    ONLINE       0     0     0

errors: No known data errors
  pool: tank
 state: ONLINE
status: The pool is formatted using a legacy on-disk format.  The pool can
        still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'.  Once this is done, the
        pool will no longer be accessible on software that does not support
feature
        flags.
  scan: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        tank        ONLINE       0     0     0
          mirror-0  ONLINE       0     0     0
            da34p3  ONLINE       0     0     0
            da35p3  ONLINE       0     0     0

errors: No known data errors

while compiling a kernel, buildworld worked and installed ok

lex -t
/usr/src/sys/modules/aic7xxx/aicasm/../../../dev/aic7xxx/aicasm/aicasm_scan.l
> aicasm_scan.c
lex -t  -Pmm
/usr/src/sys/modules/aic7xxx/aicasm/../../../dev/aic7xxx/aicasm/aicasm_macro_scan.l
> aicasm_macro_scan.c
rm -f .depend_aicasm
mkdep -f .depend_aicasm -a    -I.
-I/usr/src/sys/modules/aic7xxx/aicasm/../../../dev/aic7xxx/aicasm
-std=gnu99
/usr/src/sys/modules/aic7xxx/aicasm/../../../dev/aic7xxx/aicasm/aicasm.c
/usr/src/sys/modules/aic7xxx/aicasm/../../../dev/aic7xxx/aicasm/aicasm_symbol.c
aicasm_gram.c aicasm_macro_gram.c aicasm_scan.c aicasm_macro_scan.c
Out of file descriptors
*** [.depend_aicasm] Error code 2

Stop in /usr/src/sys/modules/aic7xxx/aicasm.
*** [buildkernel] Error code 1

Stop in /usr/src.
*** [buildkernel] Error code 1