g_vfs_done/load_block_bitmap panic

Recently, on an NFS root booted FreeBSD 6.0-STABLE box, I received the 
following panic, when trying to dd to a local disk (/dev/ad4, a sata 
drive with some fragments of a linux boot partition and ext3 filesystem):

g_vfs_done():ad4s1[READ(offset=-4096,length=4096)]error=5
panic: load_block_bitmap: block_group >= groups_count - block_group= 
131071, groups_count=502

That's all the information I have unfortunately..

Eric

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Eric Anderson        Sr. Systems Administrator        Centaur Technology
Anything that works is better than anything that doesn't.
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