Hi there, I've been bit by this bug many times, and always forget to report it here, but this time I finally remembered. The scenario is this: - I have a local repository which tracks the upstream of the project. - I have 120+ local commits. - Every week or so, I have to rebase my local commits on top of upstream's origin/master. The workflow is simple: # git fetch origin && git rebase origin/master This works without problems most of the time (well, usually there are conflicts and all, but that's a burden I have to carry). However, sometimes I notice that git fails with: # git rebase origin/master ... Applying: commitX Applying: commitY Applying: commitZ fatal: Unable to create '/home/xyz/dir1/dir2/.git/index.lock': File exists. The first thing I did was to check whether the index.lock file existed, but it doesn't. I also I thought it might have something to do with "commitZ", but after I ran "git rebase --abort" and tried rebasing again, I noticed that it would stop at another commit. This seems like a race condition, but after inspecting builtin/rebase.c it doesn't seem like the "git am" commands are run in parallel (and it wouldn't make sense if they did, anyway). I tried using GIT_TRACE, but haven't seen any useful information in the logs. I tried using the "next" branch, and found that the problem exists there as well. I wonder if anyone else has seen this problem. Thanks, -- Sergio GPG key ID: 237A 54B1 0287 28BF 00EF 31F4 D0EB 7628 65FC 5E36 Please send encrypted e-mail if possible http://sergiodj.net/