gc and empty packed-refs

So I ran `git gc` as a user with group write access to my repository, then
noticed that remote clients complaining:

allan@vent:~/var/git/www$ git pull
You asked me to pull without telling me which branch you
...
allan@vent:~/var/git/www$ fatal: The remote end hung up unexpectedly
fatal: The remote end hung up unexpectedly

which appears to be related to the packed-ref file being empty (as well 
as info/refs) on the server.  I copied the two files from my client to
the server to get things going again.  No idea if this is a sane thing 
to do, but at least my clients will pull again.

`git fsck` gives me dangling blob files:

dangling blob 9b08c9937daee703d97aa487d258f93ab92eb691
dangling blob 7361898075e647e47c8835320e5481e94d8ef275
dangling blob 359e9687e64d8f7a9fd039131fd733a9726a1bad
dangling blob a64f34e998ae9db80ef8ea33cb30e2486829d308
dangling blob a913d295a26ccda2fac7fc051f2e23400f187035
dangling blob e6773de701ef3b7a9e8c80e2319dcd4629702220

It seems gc is causes corruption.


/Allan