On a -current/amd64 box of 16 Jul 2013, I just mounted some f: 1992060 8000370 Linux Ext2 0 0 # (Cyl. 7936*- 9913*) partitions (using mount_ext2fs, not fuse), and started a copy (cp -a)to a raid 1 file system: /dev/rraid3a cylgrp dynamic inodes FFSv2 sblock FFSv2 fslevel 5 flags wapbl Went for a coffee, and came back to find a not very informative panic: You could use the rump option, and run that under gdb, which will avoid crashing your machine.
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