Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752487AbbKKLOg (ORCPT ); Wed, 11 Nov 2015 06:14:36 -0500 Received: from mail-io0-f169.google.com ([209.85.223.169]:35356 "EHLO mail-io0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752377AbbKKLOd (ORCPT ); Wed, 11 Nov 2015 06:14:33 -0500 Subject: Re: 4.3 serial driver crashes with console shortly after boot To: Andi Kleen References: <20151110002939.GG3533@two.firstfloor.org> <56414DE9.20707@hurleysoftware.com> <20151110223957.GI3533@two.firstfloor.org> <20151110224340.GA30452@two.firstfloor.org> <56427AAC.3000409@hurleysoftware.com> Cc: gregkh@linuxfoundation.org, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org From: Peter Hurley Message-ID: <56432316.3040602@hurleysoftware.com> Date: Wed, 11 Nov 2015 06:14:30 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: <56427AAC.3000409@hurleysoftware.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1371 Lines: 33 On 11/10/2015 06:15 PM, Peter Hurley wrote: > On 11/10/2015 05:43 PM, Andi Kleen wrote: >> On Tue, Nov 10, 2015 at 11:39:57PM +0100, Andi Kleen wrote: >>>> I've just tried to reproduce this without success on my current >>>> tree which has some additional patches I just posted this am. They weren't >>>> intended to fix crashes but they directly impact the area of concern. Could >>>> you try these three? >>>> >>>> [PATCH v2 2/4] n_tty: Ignore all read data when closing >>>> [PATCH v2 3/4] tty: Abstract and encapsulate tty->closing behavior >>>> [PATCH v2 4/4] tty: Remove drivers' extra tty_ldisc_flush() >>>> >>> Applying the three patches fixes the crash. >>> I haven't tried to figure out which one did the trick. >> >> Actually I was wrong sorry. It still crashes, but now it doesn't >> hang the system anymore. > > Argghh. > Can you run the patch below and send me full dmesg (privately if you prefer)? Nevermind. I see how it's happening now; it's being initiated by hangup, not close. FWIW, it's been like that nearly forever; your user-space/tool is triggering this because ECHO is on. Regards, Peter Hurley -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/