linux-kernel - Re: data loss when doing ls-remote and piped to command

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Message-ID: <2677927.DK6gFqPMyL@devpool47>
Date:   Thu, 16 Sep 2021 14:17:34 +0200
From:   Rolf Eike Beer <eb@...ix.com>
To:     git@...r.kernel.org, Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Tobias Ulmer <tu@...ix.com>, Junio C Hamano <gitster@...ox.com>,
        linux-kernel@...r.kernel.org
Subject: Re: data loss when doing ls-remote and piped to command

Am Donnerstag, 16. September 2021, 12:12:48 CEST schrieb Tobias Ulmer:
> On 16/09/2021 08:38, Rolf Eike Beer wrote:
> ...
> 
> > The redirection seems to be an important part of it. I now did:
> > 
> > git ... 2>&1 | sha256sum
> 
> I've tried to reproduce this since yesterday, but couldn't until now:
> 
> 2>&1 made all the difference, took less than a minute.
> 
> Different repo, different machine, but also running Tumbleweed
> 5.14.1-1-default, git 2.33.0
> 
> while [ "`git --git-dir=$PWD/in/linux/.git ls-remote origin 2>&1 | tee
> failed.out | sha1sum`" = "7fa299e589bacdc908395730beff542b0fc684eb  -"
> ]; do echo -n .; done
> ..........
> 
> failed.out has multiple lines like this:
> 
> --8<--
> 4e77f7f1261f65cff06918bc5e66d02a418fc842        refs/tags/v3.10.18^{}
> f7b8df0cc81cf82a4ac6834225bddbe46a340455a4a5d52f29d08d923ce8d232b0b497da674d
> d2c refs/tags/v3.18
> b2776bf7149bddd1f4161f14f79520f17fc1d71d        refs/tags/v3.18^{}
> --8<--
> 
> 
> Running the same on Archlinux (5.13.13-arch1-1, 2.33.0) doesn't show the
> problem.
> This may well turn out not to be git, but a kernel issue.

Linus,

since you have been hacking around in pipe.c recently, I fear this isn't 
entirely impossible. Have you any idea?

For easier reference, the complete thread is at:

https://public-inbox.org/git/85a103f6-8b3c-2f21-cc0f-04f517c0c9a1@emlix.com/T/

Eike
-- 
Rolf Eike Beer, emlix GmbH, http://www.emlix.com
Fon +49 551 30664-0, Fax +49 551 30664-11
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