From owner-freebsd-current@FreeBSD.ORG  Sat Aug 23 06:38:55 2014
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 20198F65;
 Sat, 23 Aug 2014 06:38:55 +0000 (UTC)
Received: from anubis.delphij.net (anubis.delphij.net [64.62.153.212])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client CN "anubis.delphij.net",
 Issuer "StartCom Class 1 Primary Intermediate Server CA" (not verified))
 by mx1.freebsd.org (Postfix) with ESMTPS id 0656C354A;
 Sat, 23 Aug 2014 06:38:54 +0000 (UTC)
Received: from delphij-macbook.local (c-24-5-244-32.hsd1.ca.comcast.net
 [24.5.244.32])
 (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits))
 (Client did not present a certificate)
 by anubis.delphij.net (Postfix) with ESMTPSA id 6620CA255;
 Fri, 22 Aug 2014 23:38:53 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=delphij.net;
 s=anubis; t=1408775933; x=1408790333;
 bh=zsC6jf6k8xXa8zZXmqPYwU592LOQhnsDLBRrKpDTD0M=;
 h=Date:From:Reply-To:To:CC:Subject;
 b=TiT9/tcoImO3cHyVddvMNY3WHCOTRiRCYPDOKQJekaKNgP/um2iTzEHnC64MHJepZ
 GKfHsSTuD6M3dceNr5aMMddwEfO0uBjb40v+sUVGqX+kOoViBAD2/n1IBxSxDxcDD/
 lvSzmyq43QYlxKU1IPcmCSUX80U9fqYTTkH0sHF0=
Message-ID: <53F836FC.9000104@delphij.net>
Date: Fri, 22 Aug 2014 23:38:52 -0700
From: Xin Li <delphij@delphij.net>
Reply-To: d@delphij.net
Organization: The FreeBSD Project
MIME-Version: 1.0
To: FreeBSD Current <freebsd-current@FreeBSD.org>, =?UTF-8?B?SmVhbi1Tw6li?=
 =?UTF-8?B?YXN0aWVuIFDDqWRyb24=?= <jean-sebastien.pedron@dumbbell.fr>
Subject: Recent vt(4) broke moused when hw.vga.textmode=1
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Cc: re@freebsd.org
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.18-1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
 <freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current/>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
 <mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 23 Aug 2014 06:38:55 -0000

Hi,

I have seen this panic via serial console, but the console is completely
unusable at the time.  VGA console is full of '?'.

Booting single user mode, I can provoke the panic with '/etc/rc.d/moused
start ums0'.

===

Fatal trap 12: page fault while in kernel mode

cpuid = 7;
apic id = 0e
Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x2c
cpuid = 6; fault code           = supervisor read data, page not present
apic id = 0c
instruction pointer     = 0x20:0xffffffff803abcf7
fault virtual address   = 0x2c
stack pointer           = 0x28:0xfffffe085f1b3880
fault code              = supervisor read data, page not present
frame pointer           = 0x28:0xfffffe085f1b38e0
instruction pointer     = 0x20:0xffffffff803ae562
code segment            = base 0x0, limit 0xfffff, type 0x1b
stack pointer           = 0x28:0xfffffe083c9b9950
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, frame pointer
        = 0x28:0xfffffe083c9b9a10
IOPL = 0
current process         = code segment          = base 0x0, limit
0xfffff, type 0x1b

The instruction pointer is Line 831 of "/usr/src/sys/dev/vt/vt_core.c".

Reverting /sys/dev/vt to r270269 would solve the panic, but I haven't
investigated further.

Cheers,