Re: "failed to read delta base object at..."

[Nicolas Pitre <nico@cam.org>]

On Mon, 25 Aug 2008, J. Bruce Fields wrote:

> Today I got this:
> 
> fatal: failed to read delta base object at 3025976 from
> /home/bfields/local/linux-2.6/.git/objects/pack/pack-f7261d96cf1161b1b0a1593f673a67d0f2469e9b.pack
> 
> This has happened once before recently, I believe with a pack that had
> just been created on a recent fetch.  (If I remember correctly, this was
> soon after a failed suspend/resume cycle that might have interrupted an
> in-progress fetch; could that possible explain the error?)  In that case
> I reset origin/master, deleted a tag or two, and fetched, and the
> problem seemed to be fixed.

The above error is indicative of a corrupted pack on disk.  To confirm 
it you could use 'git verify-pack' with the given pack file.

With a sufficiently recent git, you only need to copy over another pack 
containing the corrupted object, or the object itself in loose form, 
into your object store to "fix" it.

As to the source of disk corruptions... that's up to you to find the 
cause amongst many (including a failed suspend).


Nicolas