From owner-freebsd-stable@FreeBSD.ORG Wed May 12 03:44:59 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 07AFD106564A for ; Wed, 12 May 2010 03:44:59 +0000 (UTC) (envelope-from giovanni.trematerra@gmail.com) Received: from mail-fx0-f54.google.com (mail-fx0-f54.google.com [209.85.161.54]) by mx1.freebsd.org (Postfix) with ESMTP id 838D98FC1E for ; Wed, 12 May 2010 03:44:58 +0000 (UTC) Received: by fxm1 with SMTP id 1so446636fxm.13 for ; Tue, 11 May 2010 20:44:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:cc:content-type; bh=OwGQbcMqX8tNGyI2sR/+9qIQ9J3xNmEff+Kzp1rtlXQ=; b=RO9CLSWzzffFYNo6LLY4fek92FbxxIxq0YVihm6Lt7ZF9mMj/h60oIdNZi2ttGVfod Bx5SJPlsp/tPgmnU2Gnh3B9wTbvD5UeGKlYeMaEEd31CDsUf6zS/IYlWRnXQOiwmtbeN 98BlvyF/IHSMt1dRew+s6+pwNyouypGLuLFUM= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=BNglRDct9lZw3V0OD0D4Rh3xRU/B3HyfkZfqkCswhEt2I8GD7HndF73Yh4Mv3iwFhE WMeyHWwtHu1OjaJY/2CmbZbgeJAFHHILXdJeY8EP+rt8UTqBWzshJEOz2iG3D2nur4gZ h3iFtqU2BsDRub3cpu+Xl+yycdllUo0YFX6eI= MIME-Version: 1.0 Received: by 10.223.56.212 with SMTP id z20mr7445046fag.1.1273635897411; Tue, 11 May 2010 20:44:57 -0700 (PDT) Received: by 10.223.103.209 with HTTP; Tue, 11 May 2010 20:44:57 -0700 (PDT) In-Reply-To: <1273257226.1671.3.camel@malikania.fr> References: <4DEBDE2C-C0D2-469D-AC42-DD5027926424@FreeBSD.org> <20100507120843.GA1738@Melon.malikania.fr> <1273257226.1671.3.camel@malikania.fr> Date: Wed, 12 May 2010 05:44:57 +0200 Message-ID: From: Giovanni Trematerra To: Demelier David Content-Type: multipart/mixed; boundary=0015174733ce3d093504865d77b5 Cc: freebsd-stable@freebsd.org Subject: Re: Kernel panic when unpluggin AC adaptor X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 May 2010 03:44:59 -0000 --0015174733ce3d093504865d77b5 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Fri, May 7, 2010 at 8:33 PM, Demelier David w= rote: > Le Vendredi 07 mai 2010 =E0 18:22 +0200, Giovanni Trematerra a =E9crit : >> On Fri, May 7, 2010 at 2:08 PM, Demelier David wrote: >> > Hi, >> > =A0 =A0 =A0 =A0I noticed that pluggin the AC adaptor when I boot witho= ut it does not >> > =A0 =A0 =A0 =A0panic. It only panic when removing it. >> > >> > =A0 =A0 =A0 =A0Maybe that could help ? >> > >> >> Good to know. The problem lies somewhere when performance state change. >> In your case it happens when you remove AC adaptor. Let's hope someone o= n >> acpi@ ml comes up with a good idea. >> > > Okay so for the moment no change, I'll wait for someone with an idea > that could solve my problem. For me because the panic only happens when > changing profile from ac plugged -> ac unplugged (and not the reverse) I > would think it's a cpu related acpi issue. > I looked deeper and it seems to me that when you unplug the AC adapter, acpi_cpu_notify calls acpi_cpu_cx_cst that try to allocate a new cx_ptr->p_lvlx via acpi_PkgGas. If acpi_PkgGas set cx_ptr->p_lvlx to NULL for any reasons you'll have the panic that you reported. A solution would be to set acpi_cpu_hook to NULL so acpi_cpu_idle won't cal= l it. I need some time to have a patch because of the possible race between acpi_cpu_notify and acpi_cpu_idle during set acpi_cpu_hook to NULL. if you have time and want panic your system you could try the attached patch, just to be sure that we catch it. 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