analysis of kernel panic logs.

[sandeep kumar]

Hi Dave,

The problem is solved.
But i have one doubt.

>So the PC is 0, and the LR is C92F. That tells me that the code at
>C92F in your init process is trying to call a function through a NULL
>pointer. You can try disassembling your init process. Something like

>arm-eabi-objdump --disassemble init

In this case we came to know the process name 'init'. But in some
cases we might just have the link register address, and no process name.
say some user-space process has caused the panic.

Can u tell me ..how to debug in that case?

Thank you so much..
Sandeep




On Fri, Sep 2, 2011 at 8:43 PM, Dave Hylands <dhylands at gmail.com> wrote:

> Hi Sandeep,
>
> On Fri, Sep 2, 2011 at 4:11 AM, sandeep kumar <coolsandyforyou at gmail.com>
> wrote:
> > Logs after enabling the CONFIG_DEBUG_USER and setting user_debug to 255,
> to
> > get more info....(as suggested by Dave..)
> >
> > <3>[   89.663286] init: [boot time] processing action 0x4c5e8
> > (property:init.svc.samsungani=stopped)
> > <3>[   89.663988] init: [boot time] processing action 0x4ef20
> > (property:init.svc.samsungani=stopped)
> > <7>[   89.664049] init: unhandled page fault (11) at 0x00000000, code
> > 0x80000007
> > <1>[   89.664080] pgd = de370000
> > <1>[   89.664110] [00000000] *pgd=5eb83031, *pte=00000000, *ppte=00000000
> > <4>[   89.664141]
> > <4>[   89.664171] Pid: 1, comm:                 init
> > <4>[   89.664202] CPU: 1    Not tainted  (2.6.35.11 #4)
> > <4>[   89.664232] PC is at 0x0
> > <4>[   89.664232] LR is at 0xc92f
> > <4>[   89.664263] pc : [<00000000>]    lr : [<0000c92f>]    psr: 60000010
>
> So the PC is 0, and the LR is C92F. That tells me that the code at
> C92F in your init process is trying to call a function through a NULL
> pointer. You can try disassembling your init process. Something like
>
> arm-eabi-objdump --disassemble init
>
> You'll need to figure out which toolchain was used to compile the init
> process. I'm jjust taking a guess that it was arm-eabi-gcc.
>
> You may need to recompile with debug symbols or dig up the unstripped
> executable from your build.
>
> --
> Dave Hylands
> Shuswap, BC, Canada
> http://www.davehylands.com
>



-- 
With regards,
Sandeep Kumar Anantapalli,
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