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Possible issue with vnd

I can't cut and paste the commands I did but I think that the following is accurate.

# dd if=/dev/zero of=xubuntu bs=1 seek=100g count=1
# mke2fs xubuntu (from pkgsrc)
# vndconfig -l (to get an available slot)
# mount_ext2fs /dev/vnd2a /mnt
# rsync -av -S ./Xubuntu/ /mnt/ (sync my built up file system)

Is there anything in that list of commands that should have hung the system so badly that a reset button restart won't even boot? I have to turn the system off for a few minutes first.

I had this happen twice on one server and suspected the drives so I tried it on another and the same thing happened. It seems to happen while copying a large, sparse file over. Is the fact that the source file and target file system are both sparse causing the problem?

Running a recently compiled 7.1.0_PATCH kernel and userland.

D'Arcy J.M. Cain <> IM:darcy%Vex.Net@localhost

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