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

> 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 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.
> 
> > 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).