dd segfaults

[Guest]

I have a small script to generate a (pseudo) random number:

#!/bin/sh
FILE=/tmp/key
if ! [ -f $FILE ] ; then
    echo "creating $FILE"
    touch $FILE
fi
dd if=/dev/urandom of=$FILE count=1
sha1sum -b $FILE | cut -d " " -f 1
# end

While it does produce different output each time it runs, dd produces a seqfault.

Sample output:
creating /tmp/key
1+0 records in
1+0 records out
/home/alexp/bin/crypt: line 7: 11150 Segmentation fault      dd if=/dev/urandom of=$FILE count=1
4841f29d6d90b23202b7f73b142f9e1e5c399720

I suspect that this is a bug, annoying rather than a showstopper.

Alex