From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <junkio@cox.net>
Subject: Re: Error converting from 1.4.4.1 to 1.5.0?
Date: Wed, 14 Feb 2007 09:45:14 -0800
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To: Bill Lear <rael@zopyra.com>
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In-Reply-To: <17875.17647.74882.218627@lisa.zopyra.com> (Bill Lear's message
	of "Wed, 14 Feb 2007 11:20:47 -0600")
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Bill Lear <rael@zopyra.com> writes:

> % git fsck-objects --full
> error: Packfile .git/objects/pack/pack-23d1a9af78b4b78d1f3750cf70f83cb91a20ba64.pack SHA1 mismatch with itself
> fatal: failed to find delta-pack base object 90bad0d280a6d7c155bbd9582b35ffcf5e3bdd27
>
>
> % /usr/bin/git --version
> git version 1.4.4.1
>
> % /usr/bin/git fsck-objects --full
> error: Packfile .git/objects/pack/pack-23d1a9af78b4b78d1f3750cf70f83cb91a20ba64.pack SHA1 mismatch with itself
> fatal: failed to find delta-pack base object 90bad0d280a6d7c155bbd9582b35ffcf5e3bdd27
>
> So, all I did was try to do a commit with the new git ... haven't
> recloned, or pulled from upstream...

If you haven't packed the repository lately, the above indicates
this is not an issue between 1.4.4.1 and 1.5.0, but you had a
corrupt packfile before even started.

How big is this pack, what platform are you working on and whose
SHA-1 implementation do you use?

We used to have a bug that fed really large buffer to
SHA1_Update() function of the underlying SHA-1 library,
which was discovered exactly because somebody reported that
"mismatch with itself" message.

Also, do you have a huge blob in the repository?  I do not know
if it is related but the write_sha1_file_prepare() function on
the codepath to write loose objects out would trigger the same
bug...