freebsd-update and boot environments clash - rm / attempted!

Arthur Chance freebsd at
Wed Dec 17 11:15:07 UTC 2014

I just updated my systems to deal with the latest security bulletin. On 
the machines where I'm running zfs based boot environments I got the 
somewhat worrying:

root at arthur:5# freebsd-update fetch install
Looking up mirrors... 5 mirrors found.
Fetching metadata signature for 10.1-RELEASE from 
Fetching metadata index... done.
Fetching 2 metadata patches.. done.
Applying metadata patches... done.
Inspecting system... done.
Preparing to download files... done.
Fetching 8 patches..... done.
Applying patches... done.
Fetching 14 files... done.

The following files will be removed as part of updating to 10.1-RELEASE-p2:

The following files will be updated as part of updating to 10.1-RELEASE-p2:
[list snipped]
Installing updates...rmdir: ///: Is a directory

Fortunately it didn't remove /, although I really don't understand that 

Those who do not learn from computing history are doomed to

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