From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: Problem with rerere forget
Date: Thu, 14 May 2015 11:49:12 -0700
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To: Alex Coppens <alex@nativetouch.com>
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	(Alex Coppens's message of "Thu, 14 May 2015 14:05:55 -0400")
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Alex Coppens <alex@nativetouch.com> writes:

> git rerere forget path_to_file/file.js
>
> fatal: BUG: attempt to commit unlocked object

That comes from commit_lock_file(); I think rerere.c:write_rr()
has a call to that function and I suspect that is the call that is
giving the above message.

Is there any other process that is mucking with your .git/index file
while you are running the command?