Date: Wed, 26 May 2010 11:14:26 +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: <AANLkTimf7wzXoTjvdF07pkrUmU9qYVsxpUtbnmaNX6vv@mail.gmail.com> In-Reply-To: <AANLkTik6oKg1jFWD2zoS7fUZzZl-3Pj-EhgGa2xKer94@mail.gmail.com> References: <4DEBDE2C-C0D2-469D-AC42-DD5027926424@FreeBSD.org> <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> <AANLkTinpUCeQpayi-ZjMAyJ6tNhXT5PWM0zLsntgbJ3P@mail.gmail.com> <AANLkTik6oKg1jFWD2zoS7fUZzZl-3Pj-EhgGa2xKer94@mail.gmail.com>
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2010/5/25 Giovanni Trematerra <giovanni.trematerra@gmail.com>: > On Tue, May 25, 2010 at 5:52 PM, David DEMELIER > <demelier.david@gmail.com> wrote: >> 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.= com> 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@gmai= l.com> wrote: >>>>>>> > Hi, >>>>>>> > =C2=A0 =C2=A0 =C2=A0 =C2=A0I noticed that pluggin the AC adaptor = when 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 cha= nge. >>>>>>> In your case it happens when you remove AC adaptor. Let's hope some= one 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 w= hen >>>>>> changing profile from ac plugged -> ac unplugged (and not the revers= e) 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 attache= d >>>>> 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. >> > > This is an old one. Could you try acpi_idle5.diff.txt? I kept you in > Cc when I sent to > the list. If you have problems, let me know, I'll resend to you =C2=A0the= patch. > > Thank you. > Hi, it panic'ed with the same backtrace. Thanks. --=20 Demelier David
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