linux-kernel - Re: tty breakage in X (Was: tty vs workqueue oddities)

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Message-ID: <BANLkTikJJfyo-eExZYN4iZUO+RrkgPmX4A@mail.gmail.com>
Date:	Sun, 5 Jun 2011 16:37:40 +0200
From:	Guillaume Chazarain <guichaz@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, gregkh@...e.de,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Felipe Balbi <balbi@...com>, Tejun Heo <tj@...nel.org>
Subject: Re: tty breakage in X (Was: tty vs workqueue oddities)

On Fri, Jun 3, 2011 at 11:36 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> Otherwise we'll need to just revert it. The commit is clearly totally broken.

Even after the revert in http://git.kernel.org/linus/55db4c6 I can
reproduce some pty oddities using the test program in
http://lkml.org/lkml/2005/2/14/212.

Instead of having the output being different from the input, the child
process hangs reading while the parent is done writing.

The hangs should be easily seen with:

$ while :; do date; yes | head -n 5000 | ./a.out > /dev/null; done

-- 
Guillaume
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