init: fatal signal: Segmentation fault

I ended up in state where I can't boot
even in single user mode. This is on ia64,
but I think this is not very relevant:

FreeBSD 10.0-CURRENT #17 r232100: Wed Jun 20 11:17:16 BST 2012

*skip*

da2 at mpt1 bus 0 scbus1 target 2 lun 0
da2: <HP 73.4G MAX3073NC HPC1> Fixed Direct Access SCSI-3 device 
da2: 320.000MB/s transfers (160.000MHz, offset 127, 16bit)
da2: Command Queueing enabled
da2: 70007MB (143374738 512 byte sectors: 255H 63S/T 8924C)
da0 at mpt0 bus 0 scbus0 target 0 lun 0
da0: <SEAGATE ST318452LC 2213> Fixed Direct Access SCSI-3 device 
da0: 160.000MB/s transfers (80.000MHz, offset 63, 16bit)
da0: Command Queueing enabled
da0: 17366MB (35566478 512 byte sectors: 255H 63S/T 2213C)
da1 at mpt0 bus 0 scbus0 target 1 lun 0
da1: <SEAGATE ST318452LC 2213> Fixed Direct Access SCSI-3 device 
da1: 160.000MB/s transfers (80.000MHz, offset 63, 16bit)
da1: Command Queueing enabled
da1: 17366MB (35566478 512 byte sectors: 255H 63S/T 2213C)
Trying to mount root from ufs:/dev/da2p2 [rw]...
WARNING: / was not properly dismounted
Jun 21 17:35:34 init: fatal signal: Segmentation fault
Setting hostuuid: 0aa09909-35f1-11df-b7f8-00110a31e60a.
Setting hostid: 0xc70eae4e.
Entropy harvesting: interrupts ethernet point_to_point kickstart.
Fast boot: skipping disk checks.
mount: /dev/da2p2: R/W mount of / denied. Filesystem is not clean - run fsck.: Operation not permitted
Mounting root filesystem rw failed, startup aborted
ERROR: ABORTING BOOT (sending SIGTERM to parent)!
Jun 21 17:36:06 init: /bin/sh on /etc/rc terminated abnormally, going to single user mode
Jun 21 17:36:06 init: fatal signal: Segmentation fault

Setting hostuuid: 0aa09909-35f1-11df-b7f8-00110a31e60a.
Setting hostid: 0xc70eae4e.
Entropy harvesting: interrupts ethernet point_to_point kickstart.
Fast boot: skipping disk checks.
mount: /dev/da2p2: R/W mount of / denied. Filesystem is not clean - run fsck.: Operation not permitted
Mounting root filesystem rw failed, startup aborted
ERROR: ABORTING BOOT (sending SIGTERM to parent)!
Jun 21 17:36:37 init: /bin/sh on /etc/rc terminated abnormally, going to single user mode
Jun 21 17:36:37 init: fatal signal: Segmentation fault

This continues indefinitely,
I cannot break out of this,
except with a cold reboot,
which brings me back to this
error.

How can I recover from this?

Thanks

-- 
Anton Shterenlikht
Room 2.6, Queen's Building
Mech Eng Dept
Bristol University
University Walk, Bristol BS8 1TR, UK
Tel: +44 (0)117 331 5944
Fax: +44 (0)117 929 4423