Dangling blob after git gc

Hi,

$ git version
git version 1.6.0.4

$ git fsck
dangling blob 070011dddba40fe0066cbebfe51ea6d160f95af8
dangling blob 3ec00c535bbac37f738971a5ad14bb11892c5863
dangling commit c180face4d2451f9e77f41d4f9d4f3ad7cbd51c0
(...)

So I have multiple dangling blobs/trees/commits, let's do a gc.

$ git gc
Counting objects: 96978, done.
Compressing objects: 100% (25044/25044), done.
Writing objects: 100% (96978/96978), done.
Total 96978 (delta 70392), reused 96978 (delta 70392)

$ git fsck
dangling commit 2302e3fd37e808d3240ffa887ea1c22cac9cb770
dangling commit 0a2bc7013d49e0695242ffc2d57360d0396c22ea
dangling blob c330f89bcc20b1c9ca689e66062d086562e0633d
dangling commit ac319ab8d187e818f2dd05774175a2a7feb9696e
dangling commit a5f5b7956f7d63bab13d3f2c45c7315cfbea28b8

The commits are probably due to reflogs, that's OK. But why do I have a
dangling blob after git gc? The interesting part is that as you can see
most of them is removed, but not all.

Any ideas? :)

Thanks.