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

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From: Linus Torvalds <torvalds@...>
To: J. Bruce Fields <bfields@...>
Cc: <git@...>
Subject: Re: "failed to read delta base object at..."
Date: Monday, August 25, 2008 - 3:01 pm

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

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.


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
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Messages in current thread:
"failed to read delta base object at...", J. Bruce Fields, (Mon Aug 25, 12:46 pm)
Re: "failed to read delta base object at...", Linus Torvalds, (Mon Aug 25, 3:01 pm)
Re: "failed to read delta base object at...", J. Bruce Fields, (Mon Aug 25, 5:31 pm)
Re: "failed to read delta base object at...", Linus Torvalds, (Mon Aug 25, 5:37 pm)
Re: "failed to read delta base object at...", J. Bruce Fields, (Mon Aug 25, 6:13 pm)
Re: "failed to read delta base object at...", Linus Torvalds, (Mon Aug 25, 7:59 pm)
Re: "failed to read delta base object at...", Junio C Hamano, (Wed Aug 27, 4:14 pm)
Re: "failed to read delta base object at...", J. Bruce Fields, (Tue Aug 26, 4:55 pm)
Re: "failed to read delta base object at...", Jason McMullan, (Tue Aug 26, 4:43 pm)
Re: "failed to read delta base object at...", Jason McMullan, (Tue Aug 26, 5:01 pm)
Re: "failed to read delta base object at...", Linus Torvalds, (Wed Aug 27, 1:05 pm)
Re: "failed to read delta base object at...", Nicolas Pitre, (Wed Aug 27, 3:17 pm)
Re: "failed to read delta base object at...", Linus Torvalds, (Wed Aug 27, 3:48 pm)
Re: "failed to read delta base object at...", Nicolas Pitre, (Wed Aug 27, 4:46 pm)
[PATCH 0/3] don't let disk corruptions escape pack SHA1 chec..., Nicolas Pitre, (Thu Aug 28, 10:05 pm)
Re: [PATCH 0/3] don't let disk corruptions escape pack SHA1 ..., Shawn O. Pearce, (Fri Aug 29, 12:55 am)
[PATCH 1/3] improve reliability of fixup_pack_header_footer(), Nicolas Pitre, (Thu Aug 28, 10:07 pm)
Re: [PATCH 1/3] improve reliability of fixup_pack_header_foo..., Shawn O. Pearce, (Fri Aug 29, 12:44 am)
Re: [PATCH 1/3] improve reliability of fixup_pack_header_foo..., Nicolas Pitre, (Fri Aug 29, 9:08 am)
Re: [PATCH 1/3] improve reliability of fixup_pack_header_foo..., Shawn O. Pearce, (Fri Aug 29, 10:30 am)
Re: [PATCH 1/3] improve reliability of fixup_pack_header_foo..., Nicolas Pitre, (Fri Aug 29, 4:14 pm)
[PATCH 0/5] pack header rewriting improvements, Nicolas Pitre, (Fri Aug 29, 4:07 pm)
[PATCH 1/5] pack-objects: improve returned information from ..., Nicolas Pitre, (Fri Aug 29, 4:07 pm)
[PATCH 2/5] improve reliability of fixup_pack_header_footer(), Nicolas Pitre, (Fri Aug 29, 4:07 pm)
[PATCH 3/5] pack-objects: use fixup_pack_header_footer()'s v..., Nicolas Pitre, (Fri Aug 29, 4:08 pm)
[PATCH 4/5] index-pack: use fixup_pack_header_footer()'s val..., Nicolas Pitre, (Fri Aug 29, 4:08 pm)
[PATCH 5/5] fixup_pack_header_footer(): use nicely aligned b..., Nicolas Pitre, (Fri Aug 29, 4:08 pm)
[PATCH 2/3] pack-objects: use fixup_pack_header_footer()'s v..., Nicolas Pitre, (Thu Aug 28, 10:07 pm)
[PATCH 3/3] index-pack: use fixup_pack_header_footer()'s val..., Nicolas Pitre, (Thu Aug 28, 10:07 pm)
Re: "failed to read delta base object at...", Nicolas Pitre, (Mon Aug 25, 2:58 pm)
Re: "failed to read delta base object at...", J. Bruce Fields, (Mon Aug 25, 5:18 pm)