Date: Tue, 25 May 2010 23:29:14 +0200 From: Giovanni Trematerra <giovanni.trematerra@gmail.com> To: David DEMELIER <demelier.david@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: Kernel panic when unpluggin AC adaptor Message-ID: <AANLkTik6oKg1jFWD2zoS7fUZzZl-3Pj-EhgGa2xKer94@mail.gmail.com> In-Reply-To: <AANLkTinpUCeQpayi-ZjMAyJ6tNhXT5PWM0zLsntgbJ3P@mail.gmail.com> References: <4DEBDE2C-C0D2-469D-AC42-DD5027926424@FreeBSD.org> <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> <AANLkTinpUCeQpayi-ZjMAyJ6tNhXT5PWM0zLsntgbJ3P@mail.gmail.com>
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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.c= om> wrote: >>>>> Le Vendredi 07 mai 2010 =E0 18:22 +0200, Giovanni Trematerra a =E9cri= t : >>>>>> On Fri, May 7, 2010 at 2:08 PM, Demelier David <demelier.david@gmail= .com> wrote: >>>>>> > Hi, >>>>>> > =A0 =A0 =A0 =A0I noticed that pluggin the AC adaptor when I boot w= ithout 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 chan= ge. >>>>>> In your case it happens when you remove AC adaptor. Let's hope someo= ne 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 wh= en >>>>> 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 =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. > 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 the patch. Thank you. -- Gianni
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