module (kernel) debugging

module (kernel) debugging

[Hari Gadi]

Hi,
I am new to kernel level development. What are the best ways to debug runtime kernel (module).
Are there any third party tools for debugging the kernel.

thanks,
Hari.

Re: module (kernel) debugging

[Alan Cox]

> I am new to kernel level development. What are the best ways to debug runtime
> kernel (module).

Your brain 8)

> Are there any third party tools for debugging the kernel.

Several

	kgdb	-	debug the kernel with gdb from another PC
	kdb	-	patch for in kernel debugger
	UML	-	user mode linux (good for fs not so good for driver
			work)

Re: module (kernel) debugging

[Christoph Hellwig]

On Thu, Mar 21, 2002 at 04:30:15PM -0700, Jeff V. Merkey wrote:
> 
> One more:
> 
> MDB - source level kernel debugger.  

Where?

Re: module (kernel) debugging

[Jeff V. Merkey]

One more:

MDB - source level kernel debugger.  

:-)

Jeff

On Thu, Mar 21, 2002 at 10:58:26PM +0000, Alan Cox wrote:
> > I am new to kernel level development. What are the best ways to debug runtime
> > kernel (module).
> 
> Your brain 8)
> 
> > Are there any third party tools for debugging the kernel.
> 
> Several
> 
> 	kgdb	-	debug the kernel with gdb from another PC
> 	kdb	-	patch for in kernel debugger
> 	UML	-	user mode linux (good for fs not so good for driver
> 			work)
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
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> Please read the FAQ at  http://www.tux.org/lkml/

Re: module (kernel) debugging

[Olaf Dietsche]

Alan Cox <alan@lxorguk.ukuu.org.uk> writes:

>> I am new to kernel level development. What are the best ways to debug runtime
>> kernel (module).
>
> Your brain 8)

I can confirm this :-).

>> Are there any third party tools for debugging the kernel.

A _first_ party tool, which comes to my mind is:
	printk(KERN_DEBUG "whatever\n");
The advantage with printk() is, others can test and debug your module
as well and report results to you.

Regards, Olaf.

Re: module (kernel) debugging

[William Lee Irwin III]

On Thu, Mar 21, 2002 at 05:15:48PM -0500, Hari Gadi wrote:
> Hi,
> I am new to kernel level development. What are the best ways to debug
> runtime kernel (module). Are there any third party tools for debugging
> the kernel.


http://www.arium.com
http://oss.sgi.com/projects/kdb
http://oss.sgi.com/projects/kgdb
http://lkcd.sourceforge.net
http://bochs.sourceforge.net

... and other simulators with debugging support.


Cheers,
Bill

Re: module (kernel) debugging

[Jeff V. Merkey]

On Thu, Mar 21, 2002 at 11:29:55PM +0000, Christoph Hellwig wrote:
> On Thu, Mar 21, 2002 at 04:30:15PM -0700, Jeff V. Merkey wrote:
> > 
> > One more:
> > 
> > MDB - source level kernel debugger.  
> 
> Where?


www.kdebug.com.  They are still setting up the website and docs.  I 
completed the debugger a few weeks ago.  I have been working on 
it for several months now.  If you want a copy to play 
with, I can send after I ask permission.  I do not own it and was
hired to write it as a work for hire, so it's not open source, it's
a commercial product for Linux.  

:-)

Jeff

Re: module (kernel) debugging

[Jeff V. Merkey]

On Thu, Mar 21, 2002 at 11:29:55PM +0000, Christoph Hellwig wrote:
> On Thu, Mar 21, 2002 at 04:30:15PM -0700, Jeff V. Merkey wrote:
> > 
> > One more:
> > 
> > MDB - source level kernel debugger.  
> 
> Where?


www.kdebug.com.  They are still setting up the website and docs.  I 
completed the debugger a few weeks ago.  I have been working on 
it for several months now.  If you want a copy to play 
with, I can send after I ask permission.  I do not own it and was
hired to write it as a work for hire, so it's not open source, it's
a commercial product for Linux.  

:-)

Jeff

Re: module (kernel) debugging

[Jeff V. Merkey]

On Thu, Mar 21, 2002 at 11:29:55PM +0000, Christoph Hellwig wrote:
> On Thu, Mar 21, 2002 at 04:30:15PM -0700, Jeff V. Merkey wrote:
> > 
> > One more:
> > 
> > MDB - source level kernel debugger.  
> 
> Where?


www.kdebug.com.  They are still putting up the website and docs,
but it should go up soon.  It was written as a work for hire.  I do
not own it, but I did write it.   I was hired to write it and 
have been working on it for several months.  It's commercial 
quality kernel debugger for Linux.

I will ask them when they will have the site up.  From what I 
understand, they will be distributing the base version from 
the website at no charge, and charging for the SLD extensions.
  
:-)

Jeff

Re: module (kernel) debugging

[Andi Kleen]

Alan Cox <alan@lxorguk.ukuu.org.uk> writes:

> 
> 	kgdb	-	debug the kernel with gdb from another PC
> 	kdb	-	patch for in kernel debugger
> 	UML	-	user mode linux (good for fs not so good for driver
> 			work)
        pice    -       Private Ice. Source level debugger for modules, 
                        doesn't need a kernel patch and works with a single
                        machine. 2.2/UP only at the 
                        moment, but can be ported to 2.4. Loosely similar to 
                        Softice on Windows.

-Andi

Re: module (kernel) debugging

[Amit S. Kale]

William Lee Irwin III wrote:
> 
> On Thu, Mar 21, 2002 at 05:15:48PM -0500, Hari Gadi wrote:
> > Hi,
> > I am new to kernel level development. What are the best ways to debug
> > runtime kernel (module). Are there any third party tools for debugging
> > the kernel.
> 
> http://www.arium.com
> http://oss.sgi.com/projects/kdb
> http://oss.sgi.com/projects/kgdb

SGI's kgdb is for 2.2 kernels only.
kgdb for 2.4 kernels resides at http://kgdb.sourceforge.net/
You'll find there scripts for debugging modules with kgdb.

> http://lkcd.sourceforge.net
> http://bochs.sourceforge.net
> 
> ... and other simulators with debugging support.
> 
> Cheers,
> Bill
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/

-- 
Amit Kale
Veritas Software India ( http://www.veritasindia.com/ )

Re: module (kernel) debugging

[Andrew Morton]

"Amit S. Kale" wrote:
> 
> William Lee Irwin III wrote:
> >
> > On Thu, Mar 21, 2002 at 05:15:48PM -0500, Hari Gadi wrote:
> > > Hi,
> > > I am new to kernel level development. What are the best ways to debug
> > > runtime kernel (module). Are there any third party tools for debugging
> > > the kernel.
> >
> > http://www.arium.com
> > http://oss.sgi.com/projects/kdb
> > http://oss.sgi.com/projects/kgdb
> 
> SGI's kgdb is for 2.2 kernels only.
> kgdb for 2.4 kernels resides at http://kgdb.sourceforge.net/
> You'll find there scripts for debugging modules with kgdb.
> 

I have 2.5 kgdb stub patches too.  Various versions can be discovered
by poking around in http://www.zip.com.au/~akpm/linux/patches/

The version I use is a bit thinner than Amit's - I took out the
assertion checks from various places because they cause patching pain.
The assertion mechanism is still there, but the *uses* of it I took
out.

Of course, I may not be feature- or bugfix-current against Amit's
version.

-

module (kernel) debugging

[Rick A. Hohensee]

Hohensee's 3-ring Linux
Linux with a 3-stack Forth-like interpreter in kernelspace on vt 1.
That and a System.map is HOURS of fun.

ftp://linux01.gwdg.de/pub/cLIeNUX/interim/ABOUT

Rick Hohenseea