ZFS assert panic

[Gergo Szakal]

I have done everyday work on my ZFS-enabled FreeBSD7 box. It is having
4*250G disks in a RAIDZ array (the base system is on a separate disk).

%uname -a
FreeBSD ginger.apathy.szote.u-szeged.hu 7.0-RC1 FreeBSD 7.0-RC1 #0: Mon
Dec 24 10:10:07 UTC 2007
root at driscoll.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64


%cat info.0
Dump header from device /dev/ad4s1b
  Architecture: amd64
  Architecture Version: 2
  Dump Length: 253394944B (241 MB)
  Blocksize: 512
  Dumptime: Sun Jan 20 23:51:58 2008
  Hostname:
  Magic: FreeBSD Kernel Dump
  Version String: FreeBSD 7.0-RC1 #0: Mon Dec 24 10:10:07 UTC 2007
    root at driscoll.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC
  Panic String: solaris assert: sm->sm_space == space (0x1686d4800 ==
0x1686d3800),
file: /usr/src/sys/modules/zfs/../../contrib/opensolaris/uts/common/fs/zfs/space_map.c,
line: 357
Dump Parity: 4000765979
Bounds: 0
Dump Status: good

Of course I have tried the things described at [1] but they did not
work, same crash occured when importing. Haven't yet tried OpenSolaris,
though.
I can provide the dump should it be needed.

TIA for looking into the issue.