git@vger.kernel.org list mirror (unofficial, one of many)
 help / color / mirror / code / Atom feed
From: "Vanak, Ibrahim" <ibrahim.vanak@hpe.com>
To: Jeff King <peff@peff.net>
Cc: "git@vger.kernel.org" <git@vger.kernel.org>
Subject: RE: GIT issue while cloning (fatal: pack is corrupted (SHA1 mismatch)) !!!
Date: Tue, 28 May 2019 18:45:18 +0000	[thread overview]
Message-ID: <TU4PR8401MB1216A7B920D40B5063123A94E11E0@TU4PR8401MB1216.NAMPRD84.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <20190528093728.GA15106@sigill.intra.peff.net>

Thanks everyone for the inputs !!! upgrade of GIT to 2.21 worked.

BUT still I have significant slowness(50 times slower than clone on linux machine) while cloning. HPUX box is having very good H/W configuration and network is also stable.

Do you have any inputs on this.?

-Ibrahim

-----Original Message-----
From: Jeff King [mailto:peff@peff.net] 
Sent: Tuesday, May 28, 2019 3:07 PM
To: Vanak, Ibrahim <ibrahim.vanak@hpe.com
Cc: git@vger.kernel.org
Subject: Re: GIT issue while cloning (fatal: pack is corrupted (SHA1 mismatch)) !!!

On Tue, May 28, 2019 at 09:10:12AM +0000, Vanak, Ibrahim wrote:

> We are seeing issue with GIT 2.14 version. When we try to clone the 
> repos, it is taking HUGE amount of time on HPUX, whereas on the linux 
> machine with same network configuration, it's getting cloned in less 
> than mins. So we want to know has anyone reported this issue? What is 
> the fix for this? Has the fix been released for this? Whom should we 
> contact for this?

I don't know about the slowness, but...

> Below is the HPUX system where we are seeing issue, it is taking 1 hr 45 mins and later it failed:
> 
> root@sstl002.in.rdlabs.hpecorp.net# uname -a HP-UX sstl002 B.11.31 U 
> ia64 0158936019 unlimited-user license 
> root@sstl002.in.rdlabs.hpecorp.net# time git clone 
> git@github.hpe.com:HPUX/SysFaultMgmt.git
> Cloning into 'SysFaultMgmt'...
> remote: Enumerating objects: 63627, done.
> remote: Total 63627 (delta 0), reused 0 (delta 0), pack-reused 63627 
> Receiving objects: 100% (63627/63627), 681.90 MiB | 111.00 KiB/s, done.
> fatal: pack is corrupted (SHA1 mismatch)
> fatal: index-pack failed

Git v2.14 uses the sha1collision-detection implementation of sha1 by default. That has a bug that was fixed recently with:

  commit 4125f78222749cb8fc91115abec3ac83e5dfb194
  Author: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
  Date:   Tue May 14 00:17:01 2019 +0200
  
      sha1dc: update from upstream
      
      Update sha1dc from the latest version by the upstream
      maintainer[1]. See 07a20f569b ("Makefile: fix unaligned loads in
      sha1dc with UBSan", 2019-03-12) for the last update.
      
      This fixes an issue where HP-UX IA64 was wrongly detected as a
      Little-endian instead of a Big-endian system, see [2] and [3].
      
      1. https://github.com/cr-marcstevens/sha1collisiondetection/commit/855827c583bc30645ba427885caa40c5b81764d2
      2. https://public-inbox.org/git/603989bd-f86d-c61d-c6f5-fb6748a65ba9@siemens.com/
      3. https://github.com/cr-marcstevens/sha1collisiondetection/pull/50

which looks like it would impact your system. You can either:

  1. Try v2.22.0-rc1, which will be the first release with that fix.

  2. Try cherry-picking the various fixes on top of v2.14.0:

       git checkout v2.14.0
       git cherry-pick 23e37f8e9d5961c0c8d52ac481693d3fca5309ce
       git cherry-pick 07a20f569b4b1690e717eaac0954007a8edfbfc2
       git cherry-pick 4125f78222749cb8fc91115abec3ac83e5dfb194

  3. Compile with another sha1 implementation. E.g.:

       # if you have openssl available; otherwise,
       # try BLK_SHA1
       echo 'OPENSSL_SHA1 = Yes' >config.mak
       make

     Note that you won't be protected from collision attacks, but those
     are still impractically expensive to mount at this point. It may be
     a good tradeoff until you can upgrade to a more recent Git.

-Peff

  parent reply	other threads:[~2019-05-28 18:45 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-28  9:10 Vanak, Ibrahim
2019-05-28  9:37 ` Jeff King
2019-05-28  9:51   ` Ævar Arnfjörð Bjarmason
2019-05-28 18:45   ` Vanak, Ibrahim [this message]
2019-05-28 21:30     ` Jeff King
2019-05-29  5:29       ` Vanak, Ibrahim
2019-05-29  9:06         ` Vanak, Ibrahim
2019-05-30 11:57           ` Jeff King
2019-06-11 16:39             ` Vanak, Ibrahim
2019-06-18 14:31               ` Vanak, Ibrahim
2019-06-18 17:15                 ` Jeff Hostetler
2019-06-28 16:18                   ` Vanak, Ibrahim
2019-06-28 23:55                     ` Jeff King
2019-05-28 10:16 ` Johannes Schindelin

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: http://vger.kernel.org/majordomo-info.html

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=TU4PR8401MB1216A7B920D40B5063123A94E11E0@TU4PR8401MB1216.NAMPRD84.PROD.OUTLOOK.COM \
    --to=ibrahim.vanak@hpe.com \
    --cc=git@vger.kernel.org \
    --cc=peff@peff.net \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
Code repositories for project(s) associated with this inbox:

	https://80x24.org/mirrors/git.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).