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

From
Linus Torvalds <torvalds@linux-foundation.org>
Date
Aug 25, 2008, 19:01 UTC
Message-ID
<alpine.LFD.1.10.0808251153210.3363@nehalem.linux-foundation.org>
In-Reply-To
<20080825164602.GA2213@fieldses.org>
On Mon, 25 Aug 2008, J. Bruce Fields wrote:
Show 5 quoted lines
>
> 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 is almost certainly due to some corruption. Basically, the call to "cache_or_unpack_entry()" failed, which in turn is because 'unpack_entry()' will have failed.

And since you didn't see any other error, that failure is almost certainly due to unpack_compressed_entry() having failed. We don't print out _why_ (which is a bit sad), but the only thing that unpack_compressed_entry() does is to just "inflate()" the data at that offset.

So it probably got a zlib data error, or an adler32 crc failure.
Show 6 quoted lines
> 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.

An interrupted fetch shouldn't have caused this, it really should only happen if you have some actual filesystem data error. Something didn't get written back correctly, or the page cache isn't coherent (or it got corrupted by something else like a wild kernel pointer, of course).

			Linus
Previous: J. Bruce FieldsNext: J. Bruce Fields
Message 4 of 16 in “"failed to read delta base object at..."”
  1. J. Bruce FieldsAug 25, 2008
  2. Nicolas PitreAug 25, 2008
  3. J. Bruce FieldsAug 25, 2008
  4. Linus TorvaldsAug 25, 2008
  5. J. Bruce FieldsAug 25, 2008
  6. Linus TorvaldsAug 25, 2008
  7. J. Bruce FieldsAug 25, 2008
  8. Linus TorvaldsAug 25, 2008
  9. Jason McMullanAug 26, 2008
  10. Jason McMullanAug 26, 2008
  11. Linus TorvaldsAug 27, 2008
  12. Nicolas PitreAug 27, 2008
  13. Linus TorvaldsAug 27, 2008
  14. Nicolas PitreAug 27, 2008
  15. J. Bruce FieldsAug 26, 2008
  16. Junio C HamanoAug 27, 2008

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