unpacker error on push

Local: OS X 10.6.3, git 1.7.1
Remote: Ubuntu Lucid, git 1.7.0.4

How can I fix whatever is broken so that I can push again, and—more importantly—get the important changes I made last night over to the remote, by hook or by crook?

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On the local machine
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Slim2:bugbot3 phrogz$ git push
Counting objects: 70, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (31/31), done.
Writing objects: 100% (40/40), 26.91 KiB, done.
Total 40 (delta 11), reused 37 (delta 8)
error: unpack failed: unpack-objects abnormal exit
To git://10.20.16.110/bugbot3.git
 ! [remote rejected] planning -> planning (n/a (unpacker error))
error: failed to push some refs to 'git://10.20.16.110/bugbot3.git'


Slim2:bugbot3 phrogz$ cat .git/config 
[core]
	repositoryformatversion = 0
	filemode = true
	bare = false
	logallrefupdates = true
	ignorecase = true
[remote "origin"]
	url = git://10.20.16.110/bugbot3.git
	fetch = +refs/heads/*:refs/remotes/origin/*
[branch "master"]
	remote = origin
	merge = refs/heads/master


Slim2:bugbot3 phrogz$ git status
# On branch planning
nothing to commit (working directory clean)


Slim2:bugbot3 phrogz$ git pull origin planning
From git://10.20.16.110/bugbot3
 * branch            planning   -> FETCH_HEAD
Already up-to-date.


Slim2:bugbot3 phrogz$ git fsck --full
(no output)


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On the remote
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phrogz@gitbox:/pub/scm/bugbot3$ git config -l
user.name=Gavin Kistner
user.email=!@phrogz.net
core.repositoryformatversion=0
core.filemode=false
core.bare=false
core.logallrefupdates=true
core.ignorecase=true


phrogz@gitbox:/pub/scm/bugbot3$ git fsck --full
(no output)

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