[Crash-utility] Retrieve pointer value for scripting
Dave Anderson
anderson at redhat.com
Fri Dec 6 13:57:11 UTC 2013
----- Original Message -----
> Hello,
>
> We wish to call 'crash' with a script file to automate some basic
> command and output the result on a text file.
>
> This works perfectly for basic commands such as bt, log, mod and so on,
> especially when no input data is required.
>
> We try now to dump the kernel stack through a 'rd <@> <size>'.
> My problem is to "extract" this <@> and to "input" it in this 'rd' command.
You can dump the full kernel stack with "bt -r", although it does make
symbolic translations if possible. Perhaps that doesn't satisfy your
requirements?
>
> For the moment, I'm able to get the task_struct * with following command :
> ps | grep '>' | awk '{ print $5 };'
>
> From that, the pointer of the thread_info would be available through
> (task_struct *)->stack.
The "set" command, also available from "foreach", shows shows the thread_info
pointer, although if you run it through a script you would have to strip the
brackets from the display.
>
> But how to get all these together to finally ouptut a valid 'rd' command ?
> Meaby another way to get this kernel stack dump would exist ?
>
> Any help would be appreciate.
> Regards,
> Patrick Agrain
>
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