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

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Date:	Tue, 20 May 2008 22:38:33 +0200
From:	Willy Tarreau <w@....eu>
To:	Harald Dunkel <harald.dunkel@...nline.de>
Cc:	david@...g.hm, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Vegard Nossum <vegard.nossum@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.25.3: su gets stuck for root

On Tue, May 20, 2008 at 10:26:16PM +0200, Harald Dunkel wrote:
> david@...g.hm wrote:
> >
> >try killing syslog and then see if you continue to have the problem. 
> >It's possible that what's happening is syslog is getting stuck and su is 
> >sitting waiting for syslog to process the log entry.
> >
> 
> No improvement: I killed syslogd, and yet stty gets stuck.
> 
> But surely it was a smart idea.

have you checked in /proc/$(pidof stty)/fd/ to see if stty is bound to
any particular file descriptor ? Maybe you'll find the source of the
blocking operation here. You can find a unix socket attached to
another process, it may be a tty, a pipe, or even a device (eg:
/dev/random when there is no entropy left). Same for "su" BTW.

Regards,
willy

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