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From: Phillip Wood <phillip.wood123@gmail.com>
To: Alexander Veit <alexander.veit@gmx.net>, git@vger.kernel.org
Cc: thomas.wolf@paranor.ch, "Carlo Marcelo Arenas Belón" <carenas@gmail.com>
Subject: Re: Update to Git 2.34.0 breaks application
Date: Mon, 22 Nov 2021 21:43:51 +0000	[thread overview]
Message-ID: <04ab7301-ea34-476c-eae4-4044fef74b91@gmail.com> (raw)
In-Reply-To: <ee302c98-da27-da43-e684-c7ec8b225360@gmx.net>

Hi Alex

Thanks for the report

On 22/11/2021 08:42, Alexander Veit wrote:
> After an update from Git 2.25.1 to 2.34.0 the Java application that uses 
> the Eclipse JGit library freezes.
> 
> Strace suggests that the JVM receives a SIGTTOU from the child process 
> "git config --system --edit" created with java.lang.ProcessBuilder.
> 
> Upstream[1] has identified 3d411afa[2] as the possible commit that 
> introduced the problem.
> 
> The problem does not occur on all Linux systems.

I think the problem is possibly that git is calling tcsetattr() from a 
background process group[1]. A possible fix would be to call tcgetpgrp() 
after opening /dev/tty to see if git is in the foreground process group.

Best Wishes

Phillip

[1] https://www.man7.org/linux/man-pages/man3/tcsetattr.3p.html

> -Alex
> 
> Environment:
> OS: Linux Mint 20
> Kernel: 5.4.0-90-generic
> Git 2.34.0 from http://ppa.launchpad.net/git-core/ppa/ubuntu
> Java: OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.10+9, mixed mode)
> 
> 
> Ref.:
> [1] https://bugs.eclipse.org/bugs/show_bug.cgi?id=577358
> [2] 
> https://github.com/git/git/commit/3d411afabc9a96f41d47c07d6af6edda3d29ec92#diff-01b59b6a71e42b9c1251ffbf76a1119b965be087a78538e80e01f9239c8e5880 
> 

  reply	other threads:[~2021-11-22 21:43 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-22  8:42 Update to Git 2.34.0 breaks application Alexander Veit
2021-11-22 21:43 ` Phillip Wood [this message]
2021-11-22 22:28   ` [PATCH] editor: only save (and restore) the terminal if using a tty Carlo Marcelo Arenas Belón
2021-11-22 22:47     ` Junio C Hamano
2021-11-22 23:03     ` Junio C Hamano
2021-11-22 23:08       ` Junio C Hamano
2021-11-23  8:52         ` Alexander Veit
2021-11-23  9:08           ` Carlo Arenas
2021-11-22 23:39       ` Carlo Arenas
2021-11-23 17:35         ` Junio C Hamano
2021-11-24 13:29           ` Johannes Schindelin
2021-11-24 18:25             ` Carlo Arenas
2021-11-24 19:34             ` Junio C Hamano
2021-11-24 20:04               ` Carlo Arenas
2021-11-24 20:51                 ` Junio C Hamano
2021-11-29 21:12               ` Johannes Schindelin
2021-11-23 11:05     ` Phillip Wood
2021-11-23 17:27       ` Junio C Hamano
2021-11-23 17:31       ` Carlo Arenas
2021-11-30 11:07         ` Phillip Wood
2021-12-01  5:12           ` Chris Torek
2021-12-01 19:33             ` Junio C Hamano
2021-12-02  0:38               ` Junio C Hamano
2021-12-02  1:51                 ` Carlo Arenas
2021-12-02 14:48             ` Johannes Schindelin

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