Shutdown anomaly

[Steven Friedrich]

I am seeing the following messages, which appear to indicate a memory 
overwrite:
Waiting (max 60 seconds) for system processs 'vnlru' to stop...done
Waiting (max 60 seconds) for system processs 'bufdaemon' to stop...done
a
 iStyinncgi n(gm adxi s6k0s ,s evcnoonddess)  rfeomra isnyisntge.m. .pr0o 
cess 'syncer' to stop...0 0 done
All buffers synced.
Uptime: 8m9s

Here's what the messages usually look like:
Waiting (max 60 seconds) for system processs 'vnlru' to stop...done
Waiting (max 60 seconds) for system processs 'bufdaemon' to stop...done
Waiting (max 60 seconds) for system processs 'syncer' to stop...
Syncing disks, vnodes remaining...3 2 1 0 0 0 done
All buffers synced.
Uptime: 4h23m18s


I can reproduce this by simply rebooting to single user, mergemaster -p, make 
installworld, mergemaster, halt