linux-kernel - Re: 2.6.25.3: su gets stuck for root

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Message-ID: <20080602122819.GA25136@devserv.devel.redhat.com>
Date:	Mon, 2 Jun 2008 08:28:19 -0400
From:	Alan Cox <alan@...hat.com>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	Alan Cox <alan@...hat.com>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	David Newall <davidn@...idnewall.com>,
	Willy Tarreau <w@....eu>,
	Harald Dunkel <harald.dunkel@...nline.de>,
	Joe Peterson <joe@...rush.com>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.25.3: su gets stuck for root

On Mon, Jun 02, 2008 at 12:57:07PM +0200, Vegard Nossum wrote:
> I guess this still doesn't explain why TTOU doesn't block (IOW, stop
> the process, right?) in this case, because my test program does not
> touch it.

I see the parent process sleeping and the child taking TTOU and going to
state T. That again is correct.

alan      3219  0.0  0.0   3652   384 pts/5    S    13:11   0:00 ./repro
alan      3220  0.0  0.0   3652   204 pts/5    T    13:11   0:00 ./repro

If you run it without any straces etc do you see it blocked in T or sitting
in R ?

Alan


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