I've put my working dir on an ntfs drive so as to be able to work from both windows and ubuntu linux. I've put this one under git. When I try to run "git stash" from ubuntu, I've got the following error:
cp: preserving times for `$MYGITWORKDIR/.git/.git-stash.6306-index': Operation not permitted Cannot save the current worktree state
When I tried the same thing from windows using msysgit, no such problem occurred.
My guess is it's "cp" on ntfs folder. Is there any way to patch this problem or is it a known issue?

cp -p. I guess the ntfs driver that you are using does not support utimes(2). This causescp -pto issue an error, which causesgit stashto abort. – Chris Johnsen Oct 10 '10 at 12:46