From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751242Ab1GSRyG (ORCPT ); Tue, 19 Jul 2011 13:54:06 -0400 Received: from moutng.kundenserver.de ([212.227.126.171]:64334 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750903Ab1GSRyF (ORCPT ); Tue, 19 Jul 2011 13:54:05 -0400 From: Arnd Bergmann To: Vegard Nossum Subject: Re: WARNING: at drivers/tty/tty_ldisc.c:766 tty_ldisc_reinit+0x7d/0x90() Date: Tue, 19 Jul 2011 19:53:12 +0200 User-Agent: KMail/1.13.6 (Linux/3.0.0-rc1nosema+; KDE/4.6.3; x86_64; ; ) Cc: Jiri Slaby , LKML References: In-Reply-To: MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <201107191953.12923.arnd@arndb.de> X-Provags-ID: V02:K0:s/j4bZssiXQ233jDMXE1eSwyhP111fOMh2hPQ5qXN74 4NxWA/N9I4epVioJsAhU42MVgowql6pxoGPDwGKy3yhVuR370Q 2aas3RA5s0DAKhILOLh+eErE9NxxFvqC4LwvY57D95rGeUc3ny ltQQGvkuN1tJ6vfdG6c/Dd/SheiVx9h2arZKWbjE0chEyWIr1y QjYUDPbtFrSCXluJ3St0A== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tuesday 19 July 2011 13:33:36 Vegard Nossum wrote: > [ 74.930391] [] ? printk+0x18/0x1a > [ 74.931650] [] warn_slowpath_common+0x68/0xa0 > [ 74.933367] [] ? tty_ldisc_reinit+0x7d/0x90 > [ 74.934907] [] ? tty_ldisc_reinit+0x7d/0x90 > [ 74.936242] [] warn_slowpath_null+0x1d/0x20 > [ 74.937584] [] tty_ldisc_reinit+0x7d/0x90 > [ 74.939152] [] tty_ldisc_hangup+0xdf/0x200 > [ 74.968743] [] __tty_hangup+0xe5/0x360 > [ 74.970158] [] disassociate_ctty+0x6c/0x200 > [ 74.971526] [] do_exit+0x55b/0x7d0 > [ 74.972745] [] ? tty_write_lock+0x50/0x50 > [ 74.974052] [] do_group_exit+0x39/0xa0 > [ 74.975338] [] sys_exit_group+0x13/0x20 > [ 74.976658] [] sysenter_do_call+0x12/0x2c > [ 74.977938] [] ? pci_fixup_i450gx+0x40/0x53 > [ 74.979462] ---[ end trace c3cfae8b1239077b ]--- > > This is inside qemu/kvm with usb pass-through: -usbdevice host:9ac4:4b8f > > Any ideas? This is the WARN_ON that Jiri added in 92f6fa09b "TTY: ldisc, do not close until there are readers". Is the login process that triggered this running on the USB device you pass through, or do you have vga or serial console? Arnd