From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754681Ab0KAUrS (ORCPT ); Mon, 1 Nov 2010 16:47:18 -0400 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:44000 "EHLO www.etchedpixels.co.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754474Ab0KAUrQ (ORCPT ); Mon, 1 Nov 2010 16:47:16 -0400 Date: Mon, 1 Nov 2010 20:46:22 +0000 From: Alan Cox To: Arnd Bergmann Cc: Eli Billauer , Andrew Morton , linux-kernel@vger.kernel.org, Greg KH Subject: Re: open() on /dev/tty takes 30 seconds on 2.6.36 Message-ID: <20101101204622.7fbab5cc@lxorguk.ukuu.org.uk> In-Reply-To: <201011012039.16312.arnd@arndb.de> References: <4CCBCD8E.1020601@billauer.co.il> <201010310436.18613.arnd@arndb.de> <4CCE140C.8050909@billauer.co.il> <201011012039.16312.arnd@arndb.de> X-Mailer: Claws Mail 3.7.6 (GTK+ 2.18.9; x86_64-redhat-linux-gnu) Face: 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 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > I think we need to find out why it's hitting the timeout most of all, Its a perfectly normal happening in some cases - eg when you the remote end asserts flow control and then hangs up on you leaving it that way. So we need to handle this by dropping locks correctly.