non-monotonic index when using http://?

non-monotonic index when using http://?

[Martin Waitz]

[-- Attachment #1: Type: text/plain, Size: 2707 bytes --]

hoi :)

At work I'm getting the following error message, any ideas?

> git --version
git version 1.4.2.rc4.g242a
> git pull upstream
Fetching refs/heads/master from http://git.kernel.org/pub/scm/git/git.git using http
error: non-monotonic index
walk 43134fcb350fb70d26634be163db1f71c14db19f
walk 55c3eb434ab6d489c632263239be15a1054df7f2
Getting alternates list for http://git.kernel.org/pub/scm/git/git.git/
Getting pack list for http://git.kernel.org/pub/scm/git/git.git/
error: non-monotonic index
/home/tcmc_mwz/i686/bin/git-fetch: line 402:  2077 Segmentation fault
git-http-fetch -v -a "$head" "$remote/"
zsh: exit 1     git pull upstream
> gdb git-http-fetch
GNU gdb Red Hat Linux (6.3.0.0-1.132.EL3rh)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux-gnu"...Using host libthread_db library "/lib/tls/libthread_db.so.1".
 
(gdb) run -v -a 43134fcb350fb70d26634be163db1f71c14db19f http://git.kernel.org/pub/scm/git/git.git/
Starting program: /autohome/tcmc_mwz/src/git/git-http-fetch -v -a 43134fcb350fb70d26634be163db1f71c14db19f http://git.kernel.org/pub/scm/git/git.git/
error: non-monotonic index
walk 43134fcb350fb70d26634be163db1f71c14db19f
walk 55c3eb434ab6d489c632263239be15a1054df7f2
Getting alternates list for http://git.kernel.org/pub/scm/git/git.git/
Getting pack list for http://git.kernel.org/pub/scm/git/git.git/
error: non-monotonic index
 
Program received signal SIGSEGV, Segmentation fault.
0x0804c1e2 in setup_index (repo=0x991a058,
    sha1=0xbfffa420 "y:\236\223(mleiA\227}.[Iï¿¿\205fï¿¿ï¿¿") at http-fetch.c:501
501             new_pack->next = repo->packs;
(gdb) bt
#0  0x0804c1e2 in setup_index (repo=0x991a058,
    sha1=0xbfffa420 "y:\236\223(mleiA\227}.[Iï¿¿\205fï¿¿ï¿¿") at http-fetch.c:501
#1  0x0804d17c in fetch_indices (repo=0x991a058) at http-fetch.c:946
#2  0x0804d217 in fetch_pack (repo=0x991a058,
    sha1=0x994eb9c "Uï¿¿\230Dï¿¿\036 &p\aihï¿¿\rï¿¿\017ï¿¿hs.ï¿¿") at http-fetch.c:978
#3  0x0804d7f6 in fetch (sha1=0x994eb9c "Uï¿¿\230Dï¿¿\036 &p\aihï¿¿\rï¿¿\017ï¿¿hs.ï¿¿")
    at http-fetch.c:1130
#4  0x0804a414 in loop () at fetch.c:179
#5  0x0804a77b in pull (targets=1, target=0xbfffb600, write_ref=0x0,
    write_ref_log_details=0xbfffd3b9 "http://git.kernel.org/pub/scm/git/git.git/") at fetch.c:288
#6  0x0804dbd7 in main (argc=5, argv=0xbfffb5f4) at http-fetch.c:1282

-- 
Martin Waitz

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 189 bytes --]

Re: non-monotonic index when using http://?

[Junio C Hamano]

Martin Waitz <tali@admingilde.org> writes:

> hoi :)
>
> At work I'm getting the following error message, any ideas?
>
>> git --version
> git version 1.4.2.rc4.g242a
>> git pull upstream
> Fetching refs/heads/master from http://git.kernel.org/pub/scm/git/git.git using http
> error: non-monotonic index
> walk 43134fcb350fb70d26634be163db1f71c14db19f
> walk 55c3eb434ab6d489c632263239be15a1054df7f2
> Getting alternates list for http://git.kernel.org/pub/scm/git/git.git/
> Getting pack list for http://git.kernel.org/pub/scm/git/git.git/
> error: non-monotonic index

The "non monotonic index" check is to make sure pack .idx file
is sane, and it appears that you are getting the error before
you fetch new pack from the server, which means one of your
local packs is bad.

I just cloned from the kernel.org archive over http (I usually
don't, but your report was alarming enough) and the packfile I
have there do not seem to have the problem.

Re: non-monotonic index when using http://?

[Martin Waitz]

[-- Attachment #1: Type: text/plain, Size: 691 bytes --]

On Mon, Aug 21, 2006 at 02:20:38AM -0700, Junio C Hamano wrote:
> The "non monotonic index" check is to make sure pack .idx file
> is sane, and it appears that you are getting the error before
> you fetch new pack from the server, which means one of your
> local packs is bad.

You are right, the local archive is corrupted, it works with
a fresh clone.

For some reason, I have a
.git/objects/pack/pack-793a9e93286d6c656941977d2e5b49e28566edcd.idx
without the corresponding .pack file.

Has anybody seen something like this before?


Should GIT bail out earlier when it sees this non-monotonic-index
corruption?
At least, it should not SEGV later...

-- 
Martin Waitz

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 189 bytes --]

Re: non-monotonic index when using http://?

[Junio C Hamano]

Martin Waitz <tali@admingilde.org> writes:

> For some reason, I have a
> .git/objects/pack/pack-793a9e93286d6c656941977d2e5b49e28566edcd.idx
> without the corresponding .pack file.

It is worrysome why.  In the meantime you could remove it (if it
were a .pack file without .idx then you may want to try feeding
it to unpack-objects but .idx without corresponding .pack is
pretty much useless).

> At least, it should not SEGV later...

Absolutely.  The particular code in http-fetch (your gdb session
tells us exactly where) seems quite loosely written, and there
may be other places that do not check return values.