Kernel panic when unpluggin AC adaptor

[Demelier David]

On Wed, May 05, 2010 at 10:49:23AM +0100, Rui Paulo wrote:
> 
> On 5 May 2010, at 08:40, Demelier David wrote:
> 
> > On Wed, May 05, 2010 at 01:19:45AM +0100, Rui Paulo wrote:
> >> On 4 May 2010, at 21:38, Kostik Belousov wrote:
> >> 
> >>> On Tue, May 04, 2010 at 10:27:23PM +0200, David DEMELIER wrote:
> >>>> 2010/5/4 Kostik Belousov <kostikbel at gmail.com>:
> >>>>> On Tue, May 04, 2010 at 06:35:52PM +0200, David DEMELIER wrote:
> >>>>>> Good news ! It worked, check the picture here :
> >>>>>> 
> >>>>>> http://img63.imageshack.us/img63/4244/dsc00361g.jpg
> >>>>> 
> >>>>> Please try adding code fragment like this:
> >>>>>       if (cx_next->p_lvlx == NULL)
> >>>>>               printf("Going to panic.\n");
> >>>>> to  dev/acpi/acpi_cpu.c:acpi_cpu_idle() function, right before
> >>>>>   CPU_GET_REG(cx_next->p_lvlx, 1);
> >>>>> line and see if it prints the message immediately before the panic.
> >>>>> 
> >>>> 
> >>>> Yes it does at the beginning of the kernel panic.
> >>> 
> >>> Ok, so the point of panic is found, it is NULL cx_next->p_lvlx resource.
> >>> With the data in hand, I recommend you to ask on acpi@ (added a Cc:)
> >>> about the cause and possible solution.
> >> 
> >> I don't remember the details, but I've seen this before. Does your CPU Cx levels change when you plug/unplug the AC adapter?
> >> 
> > 
> > May  4 15:48:32 Melon power_profile: changed to 'economy'
> > May  4 15:48:35 Melon power_profile: changed to 'performance'
> 
> I wasn't asking about the profiles. Show us the output of sysctl dev.cpu with and without the AC cord plugged in.
> 

That is when I have ac unplugged :

$ sysctl dev.cpu
dev.cpu.0.%desc: ACPI CPU
dev.cpu.0.%driver: cpu
dev.cpu.0.%location: handle=\_PR_.CPU0
dev.cpu.0.%pnpinfo: _HID=none _UID=0
dev.cpu.0.%parent: acpi0
dev.cpu.0.freq: 1200
dev.cpu.0.freq_levels: 2101/35000 1837/30625 1600/23888 1400/20902 1200/15000
1050/13125 900/11250 750/9375 600/7500 450/5625 300/3750 150/1875
dev.cpu.0.cx_supported: C1/1 C2/57
dev.cpu.0.cx_lowest: C2
dev.cpu.0.cx_usage: 7.22% 92.77% last 2482us
dev.cpu.1.%desc: ACPI CPU
dev.cpu.1.%driver: cpu
dev.cpu.1.%location: handle=\_PR_.CPU1
dev.cpu.1.%pnpinfo: _HID=none _UID=0
dev.cpu.1.%parent: acpi0
dev.cpu.1.cx_supported: C1/1 C2/57
dev.cpu.1.cx_lowest: C2
dev.cpu.1.cx_usage: 5.55% 94.44% last 7724us

-- 
Demelier David