Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751605AbZGJIfd (ORCPT ); Fri, 10 Jul 2009 04:35:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750947AbZGJIfY (ORCPT ); Fri, 10 Jul 2009 04:35:24 -0400 Received: from e28smtp02.in.ibm.com ([59.145.155.2]:44041 "EHLO e28smtp02.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750794AbZGJIfX (ORCPT ); Fri, 10 Jul 2009 04:35:23 -0400 Message-ID: <4A56FD45.6060304@in.ibm.com> Date: Fri, 10 Jul 2009 14:05:17 +0530 From: Sachin Sant User-Agent: Thunderbird 2.0.0.19 (X11/20081216) MIME-Version: 1.0 To: Alan Cox CC: linux-kernel , linuxppc-dev@ozlabs.org Subject: Re: Badness at drivers/char/tty_ldisc.c:210 during shutdown References: <4A3A2D2B.7070704@in.ibm.com> <4A3F281F.9000408@in.ibm.com> <1245655421.4400.78.camel@concordia> <20090622095245.38edafdd@lxorguk.ukuu.org.uk> In-Reply-To: <20090622095245.38edafdd@lxorguk.ukuu.org.uk> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1511 Lines: 40 Alan Cox wrote: >>> [c00000003cf6ba70] [c00000000040a3d0] .tty_ldisc_put+0xa4/0xf4 (unreliable) >>> [c00000003cf6bb10] [c00000000040a7c8] .tty_ldisc_reinit+0x38/0x80 >>> [c00000003cf6bba0] [c00000000040b1d8] .tty_ldisc_hangup+0x190/0x260 >>> [c00000003cf6bc40] [c000000000401090] .do_tty_hangup+0x188/0x4c0 >>> [c00000003cf6bd20] [c000000000401440] .tty_vhangup_self+0x34/0x54 >>> [c00000003cf6bdb0] [c00000000019236c] .sys_vhangup+0x38/0x58 >>> [c00000003cf6be30] [c000000000008534] syscall_exit+0x0/0x40 >>> Instruction dump: >>> 912b0088 4bcd17bd 60000000 e87e8008 7f44d378 481c04fd 60000000 801b0008 >>> 7c09fe70 7d200278 7c004850 54000ffe <0b000000> 7f63db78 4bd7c98d 60000000 >>> >> Ah right, so this has check has just gone in, and the code in question >> has been rewritten somewhat just recently. >> > > The check is to catch any cases where a line discipline is being freed up > but has a refcount that is non zero. I think I know what is going on here. > This issue can be recreated with 2.6.31-rc2-git4 kernel (34f25476ace556263784ea2f8173e22b25557a13). Thanks -Sachin -- --------------------------------- Sachin Sant IBM Linux Technology Center India Systems and Technology Labs Bangalore, India --------------------------------- -- 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/