* rogue tree objects, how to diagnose?
@ 2009-03-01 3:12 David Miller
2009-03-01 3:20 ` Jeff King
0 siblings, 1 reply; 8+ messages in thread
From: David Miller @ 2009-03-01 3:12 UTC (permalink / raw)
To: git
I've got this weird problem.
In my local net-next-2.6 tree I tries to pull from a
colleague and this resulted in:
davem@sunset:~/src/GIT/net-next-2.6$ git pull git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6.git master
...
From git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6
* branch master -> FETCH_HEAD
fatal: unable to read tree c9ee57c5c20c3b7a2d7784a4172aef8b34c3a844
davem@sunset:~/src/GIT/net-next-2.6$ git show c9ee57c5c20c3b7a2d7784a4172aef8b34c3a844
fatal: bad object c9ee57c5c20c3b7a2d7784a4172aef8b34c3a844
davem@sunset:~/src/GIT/net-next-2.6$
Now, what's funny is that this tree object does exist in my
tree on master.kernel.org:
[davem@hera net-next-2.6.git]$ git ls-tree c9ee57c
100644 blob ffa0efce0aed06aa51be310e14dfe4b5bac8c3b4 Kconfig
100644 blob be8f287aa398f0a9697f9af30d4cda25b95ea1f0 Makefile
100644 blob dbb912574569ef49375866a5053e429bf6d38831 cm4000_cs.c
100644 blob 4f0723b07974615f5177134b49deb671580e8813 cm4040_cs.c
100644 blob 9a8b805c5095487a8f59ac22475d417d6436ac23 cm4040_cs.h
040000 tree 1314476b63b18a2c4f6dc84dd00c4ed25b7fccd9 ipwireless
100644 blob 5608a1e5a3b3416fa44e44e504c9a2817d1c3c2c synclink_cs.c
[davem@hera net-next-2.6.git]$
And if I do a full clone of my master.kernel.org tree I get the
tree object.
Now, I have done a by-hand revert in this tree a long time ago
(by just by-hand changing the SHA1 ID in 'master') so that may
have contributed to this happening.
But anyways, if I pull into ~/src/GIT/net-next-2.6 locally , I don't
get that tree object.
I don't understand how this can happen, and I'd like to be able
to diagnose this intelligently.
So, what is an easy way to figure out what commit references tree
object X?
Thanks!
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: rogue tree objects, how to diagnose?
2009-03-01 3:12 rogue tree objects, how to diagnose? David Miller
@ 2009-03-01 3:20 ` Jeff King
2009-03-01 3:44 ` David Miller
0 siblings, 1 reply; 8+ messages in thread
From: Jeff King @ 2009-03-01 3:20 UTC (permalink / raw)
To: David Miller; +Cc: git
On Sat, Feb 28, 2009 at 07:12:06PM -0800, David Miller wrote:
> From git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6
> * branch master -> FETCH_HEAD
> fatal: unable to read tree c9ee57c5c20c3b7a2d7784a4172aef8b34c3a844
> davem@sunset:~/src/GIT/net-next-2.6$ git show c9ee57c5c20c3b7a2d7784a4172aef8b34c3a844
> fatal: bad object c9ee57c5c20c3b7a2d7784a4172aef8b34c3a844
> davem@sunset:~/src/GIT/net-next-2.6$
>
> Now, what's funny is that this tree object does exist in my
> tree on master.kernel.org:
"bad object" is about an object that did not parse correctly, as opposed
to one that is missing. So it's possible that your repository is
corrupted.
> I don't understand how this can happen, and I'd like to be able
> to diagnose this intelligently.
I'm not up on the latest techniques for verifying and fixing corruption.
But I think with recent enough git, you can grab a good copy of the
object from another repo and put it in
.git/objects/c9/ee57c5c20c3b7a2d7784a4172aef8b34c3a844
that git would do the right thing.
> So, what is an easy way to figure out what commit references tree
> object X?
Try:
git log --all --pretty=format:'%H %T' | grep c9ee57c5c | cut -d' ' -f1
keeping in mind that there may be multiple such commits.
-Peff
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: rogue tree objects, how to diagnose?
2009-03-01 3:20 ` Jeff King
@ 2009-03-01 3:44 ` David Miller
2009-03-01 3:46 ` Jeff King
0 siblings, 1 reply; 8+ messages in thread
From: David Miller @ 2009-03-01 3:44 UTC (permalink / raw)
To: peff; +Cc: git
From: Jeff King <peff@peff.net>
Date: Sat, 28 Feb 2009 22:20:35 -0500
> On Sat, Feb 28, 2009 at 07:12:06PM -0800, David Miller wrote:
>
> > From git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6
> > * branch master -> FETCH_HEAD
> > fatal: unable to read tree c9ee57c5c20c3b7a2d7784a4172aef8b34c3a844
> > davem@sunset:~/src/GIT/net-next-2.6$ git show c9ee57c5c20c3b7a2d7784a4172aef8b34c3a844
> > fatal: bad object c9ee57c5c20c3b7a2d7784a4172aef8b34c3a844
> > davem@sunset:~/src/GIT/net-next-2.6$
> >
> > Now, what's funny is that this tree object does exist in my
> > tree on master.kernel.org:
>
> "bad object" is about an object that did not parse correctly, as opposed
> to one that is missing. So it's possible that your repository is
> corrupted.
I see.
I GC and repack my local repos a lot, maybe it happened during
one of those.
Thanks a lot Jeff, I'll try to fix the corruption using the
suggestions you gave me.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: rogue tree objects, how to diagnose?
2009-03-01 3:44 ` David Miller
@ 2009-03-01 3:46 ` Jeff King
2009-03-01 3:58 ` David Miller
2009-03-01 5:57 ` David Miller
0 siblings, 2 replies; 8+ messages in thread
From: Jeff King @ 2009-03-01 3:46 UTC (permalink / raw)
To: David Miller; +Cc: git
On Sat, Feb 28, 2009 at 07:44:54PM -0800, David Miller wrote:
> > "bad object" is about an object that did not parse correctly, as opposed
> > to one that is missing. So it's possible that your repository is
> > corrupted.
>
> I see.
>
> I GC and repack my local repos a lot, maybe it happened during
> one of those.
>
> Thanks a lot Jeff, I'll try to fix the corruption using the
> suggestions you gave me.
If it is real corruption, you might want to save a copy of the
repository. I think Linus and Nicolas like to pick apart corruption to
figure out if it is a git bug or a disk failure.
-Peff
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: rogue tree objects, how to diagnose?
2009-03-01 3:46 ` Jeff King
@ 2009-03-01 3:58 ` David Miller
2009-03-01 5:57 ` David Miller
1 sibling, 0 replies; 8+ messages in thread
From: David Miller @ 2009-03-01 3:58 UTC (permalink / raw)
To: peff; +Cc: git
From: Jeff King <peff@peff.net>
Date: Sat, 28 Feb 2009 22:46:33 -0500
> On Sat, Feb 28, 2009 at 07:44:54PM -0800, David Miller wrote:
>
> > Thanks a lot Jeff, I'll try to fix the corruption using the
> > suggestions you gave me.
>
> If it is real corruption, you might want to save a copy of the
> repository. I think Linus and Nicolas like to pick apart corruption to
> figure out if it is a git bug or a disk failure.
I have a copy saved.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: rogue tree objects, how to diagnose?
2009-03-01 3:46 ` Jeff King
2009-03-01 3:58 ` David Miller
@ 2009-03-01 5:57 ` David Miller
2009-03-01 6:40 ` Junio C Hamano
1 sibling, 1 reply; 8+ messages in thread
From: David Miller @ 2009-03-01 5:57 UTC (permalink / raw)
To: peff; +Cc: git
From: Jeff King <peff@peff.net>
Date: Sat, 28 Feb 2009 22:46:33 -0500
> On Sat, Feb 28, 2009 at 07:44:54PM -0800, David Miller wrote:
>
> > > "bad object" is about an object that did not parse correctly, as opposed
> > > to one that is missing. So it's possible that your repository is
> > > corrupted.
> >
> > I see.
> >
> > I GC and repack my local repos a lot, maybe it happened during
> > one of those.
> >
> > Thanks a lot Jeff, I'll try to fix the corruption using the
> > suggestions you gave me.
>
> If it is real corruption, you might want to save a copy of the
> repository. I think Linus and Nicolas like to pick apart corruption to
> figure out if it is a git bug or a disk failure.
Indeed I have some serious corruption in my pack file.
I've put this .git dir up at:
http://vger.kernel.org/~davem/netnext26_git.tar.gz
if anyone wants to have a look.
davem@sunset:~/src/GIT/net-next-2.6$ git fsck --full
error: d7d82ec12e618a3152a82f7fbd459ad285403740: invalid sha1 pointer in cache-tree
error: 95381186c4ef9d69f56bb6a9f7334ebe81dd023c: invalid sha1 pointer in cache-tree
error: 6bea4ad565fff638d396298cb6ee7ad6a31ca252: invalid sha1 pointer in cache-tree
error: 3c8b516f2a9634410f6c3a0ee639627d7c4a83d2: invalid sha1 pointer in cache-tree
error: 11f0695e84bc3f83a6eea0d6fb0af2789de351ef: invalid sha1 pointer in cache-tree
error: 7b3c81544c3117201c160af43fa983d68c614e3d: invalid sha1 pointer in cache-tree
error: c9ee57c5c20c3b7a2d7784a4172aef8b34c3a844: invalid sha1 pointer in cache-tree
broken link from tree 0b44b1f3ec61d2ce0867be1f852b97283b94eedc
to tree c9ee57c5c20c3b7a2d7784a4172aef8b34c3a844
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^ permalink raw reply [flat|nested] 8+ messages in thread* Re: rogue tree objects, how to diagnose?
2009-03-01 5:57 ` David Miller
@ 2009-03-01 6:40 ` Junio C Hamano
2009-03-01 6:53 ` David Miller
0 siblings, 1 reply; 8+ messages in thread
From: Junio C Hamano @ 2009-03-01 6:40 UTC (permalink / raw)
To: David Miller; +Cc: peff, git
David Miller <davem@davemloft.net> writes:
> Indeed I have some serious corruption in my pack file.
Just a sanity check; did you run verify-pack on each packfile to validate
that suspicion?
> I've put this .git dir up at:
>
> http://vger.kernel.org/~davem/netnext26_git.tar.gz
>
> if anyone wants to have a look.
>
> davem@sunset:~/src/GIT/net-next-2.6$ git fsck --full
> error: d7d82ec12e618a3152a82f7fbd459ad285403740: invalid sha1 pointer in cache-tree
> error: 95381186c4ef9d69f56bb6a9f7334ebe81dd023c: invalid sha1 pointer in cache-tree
> error: 6bea4ad565fff638d396298cb6ee7ad6a31ca252: invalid sha1 pointer in cache-tree
> error: 3c8b516f2a9634410f6c3a0ee639627d7c4a83d2: invalid sha1 pointer in cache-tree
> error: 11f0695e84bc3f83a6eea0d6fb0af2789de351ef: invalid sha1 pointer in cache-tree
> error: 7b3c81544c3117201c160af43fa983d68c614e3d: invalid sha1 pointer in cache-tree
> error: c9ee57c5c20c3b7a2d7784a4172aef8b34c3a844: invalid sha1 pointer in cache-tree
These may only indicate that your .git/index is corrupt but the object
database may still be good.
We fixed an incorrect "missing object" diagnosis when your repository
borrows objects from another repository via the alternates mechanism
(check if .git/objects/info/alternates refers to another repository)
fairly recently. "Missing objects" could be false alarms.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: rogue tree objects, how to diagnose?
2009-03-01 6:40 ` Junio C Hamano
@ 2009-03-01 6:53 ` David Miller
0 siblings, 0 replies; 8+ messages in thread
From: David Miller @ 2009-03-01 6:53 UTC (permalink / raw)
To: gitster; +Cc: peff, git
From: Junio C Hamano <gitster@pobox.com>
Date: Sat, 28 Feb 2009 22:40:34 -0800
> David Miller <davem@davemloft.net> writes:
>
> > Indeed I have some serious corruption in my pack file.
>
> Just a sanity check; did you run verify-pack on each packfile to validate
> that suspicion?
No, sorry, I didn't validate it in that way.
I just ran verify-pack on all of the *.idx files and it produced
no output.
But I do know for a fact that the corrupt tree object c9ee57c is in a
pack and not sitting there explicitly under .git/objects/c9/
> These may only indicate that your .git/index is corrupt but the object
> database may still be good.
>
> We fixed an incorrect "missing object" diagnosis when your repository
> borrows objects from another repository via the alternates mechanism
> (check if .git/objects/info/alternates refers to another repository)
> fairly recently. "Missing objects" could be false alarms.
Yes I do use alternates heavily.
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2009-03-01 6:56 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2009-03-01 3:12 rogue tree objects, how to diagnose? David Miller
2009-03-01 3:20 ` Jeff King
2009-03-01 3:44 ` David Miller
2009-03-01 3:46 ` Jeff King
2009-03-01 3:58 ` David Miller
2009-03-01 5:57 ` David Miller
2009-03-01 6:40 ` Junio C Hamano
2009-03-01 6:53 ` David Miller
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