[BUG?] Working tree getting out of date "spontaneously"

Hi,

can't make any sense out of this at all:

doener@atjola:git (master) $ git reset --hard HEAD@{1} HEAD is now at b11cf09 Merge branch 'da/pretty-tempname' doener@atjola:git (master) $ git update-ref refs/remotes/origin/master HEAD

doener@atjola:git (master) $ git pull
From git://git.kernel.org/pub/scm/git/git
   b11cf09..6096d75  master     -> origin/master
Updating b11cf09..6096d75
Fast forward
 Documentation/RelNotes-1.6.3.2.txt     |   12 +++++-------
 Documentation/git.txt                  |    7 ++++++-
 contrib/completion/git-completion.bash |   12 ++++++++++--
 grep.c                                 |    6 +++++-
 4 files changed, 26 insertions(+), 11 deletions(-)

doener@atjola:git (master) $ git diff-index --name-only HEAD doener@atjola:git (master) $ git diff-index --name-only --cached HEAD

*wait a minute, doing nothing*

doener@atjola:git (master) $ git diff-index --name-only HEAD Documentation/RelNotes-1.6.3.2.txt Documentation/git.txt contrib/completion/git-completion.bash grep.c

doener@atjola:git (master) $ git diff-index --name-only --cached HEAD

doener@atjola:git (master) $ git diff-index --stat HEAD
 0 files changed, 0 insertions(+), 0 deletions(-)

doener@atjola:git (master) $ git diff-index --name-only HEAD Documentation/RelNotes-1.6.3.2.txt Documentation/git.txt contrib/completion/git-completion.bash grep.c

Running "git status" seems to fix things.

Björn, confused