Hi,
with ddb in the kernel I've been able to get more info:
the sup process is hung on getnewblk, others are stuck on vnlock.
A ddb stack trace for curproc always shows:

ltlseep
getnewbuf
getblk
ufs_bmaparray
ufs_bmap
genfs_getpages
ffs_getpages
uvn_get
uvm_fault
normal_mem_fault

I've not been able to get a core dump, the kernel gets a data access exeption
while trying to dump

--
Manuel Bouyer, LIP6, Universite Paris VI.           Manuel.Bouyer@lip6.fr
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