Date: Tue, 25 May 2010 17:52:28 +0200 From: David DEMELIER <demelier.david@gmail.com> To: Giovanni Trematerra <giovanni.trematerra@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: Kernel panic when unpluggin AC adaptor Message-ID: <AANLkTinpUCeQpayi-ZjMAyJ6tNhXT5PWM0zLsntgbJ3P@mail.gmail.com> In-Reply-To: <AANLkTikOBiz6XI55pEFlG-SS07r7yyz2o9PifWB9vgHB@mail.gmail.com> References: <4DEBDE2C-C0D2-469D-AC42-DD5027926424@FreeBSD.org> <i2ub3954bba1005061103ya3dabb7dw2d60d3aab712ed47@mail.gmail.com> <v2tb3954bba1005070134x3cca53c1vc67e5557e680061d@mail.gmail.com> <i2j4e6cba831005070159qa3df06ccw925073a05a1057f7@mail.gmail.com> <20100507120843.GA1738@Melon.malikania.fr> <k2u4e6cba831005070922vfc3bcf18i59551da3b40317a@mail.gmail.com> <1273257226.1671.3.camel@malikania.fr> <AANLkTilcNzzLt2GUPbL_Vqjspzx5a-oem1oZpKAYqoN8@mail.gmail.com> <AANLkTinYntwwReJDB0blprk1TCy7j1xKca0LzTgUJBDe@mail.gmail.com> <AANLkTikOBiz6XI55pEFlG-SS07r7yyz2o9PifWB9vgHB@mail.gmail.com>
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2010/5/25 Giovanni Trematerra <giovanni.trematerra@gmail.com>: > On Mon, May 24, 2010 at 9:43 PM, David DEMELIER > <demelier.david@gmail.com> wrote: >> 2010/5/12 Giovanni Trematerra <giovanni.trematerra@gmail.com>: >>> On Fri, May 7, 2010 at 8:33 PM, Demelier David <demelier.david@gmail.co= m> wrote: >>>> Le Vendredi 07 mai 2010 =C3=A0 18:22 +0200, Giovanni Trematerra a =C3= =A9crit : >>>>> On Fri, May 7, 2010 at 2:08 PM, Demelier David <demelier.david@gmail.= com> wrote: >>>>> > Hi, >>>>> > =C2=A0 =C2=A0 =C2=A0 =C2=A0I noticed that pluggin the AC adaptor wh= en I boot without it does not >>>>> > =C2=A0 =C2=A0 =C2=A0 =C2=A0panic. It only panic when removing it. >>>>> > >>>>> > =C2=A0 =C2=A0 =C2=A0 =C2=A0Maybe that could help ? >>>>> > >>>>> >>>>> Good to know. The problem lies somewhere when performance state chang= e. >>>>> In your case it happens when you remove AC adaptor. Let's hope someon= e on >>>>> 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 whe= n >>>> 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 =C2=A0via 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= call 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. >>> >> >> Hi, it paniced today ! I don't know why it randomly panic but it did, >> the backtrace didn't change. There is a picture about the panic : >> >> http://img541.imageshack.us/img541/2773/dsc00388xa.jpg > > What was you trying? acpi_idle5.diff.txt patch? > How did it panic? Unplugging AC adapter? > Hi, I tried this one : lvlx.diff.txt. Yes by unplugging the AC adapter. --=20 Demelier David
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