Crashing red hat linux

Crashing red hat linux

[dipankar das]

Hi
 Does Red hat like Monta vista allow crashing the
kernel by writing to  "/dev/crash" if not whats the
easiest way ?



 -- Dipankar.


		
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Re: Crashing red hat linux

[Coywolf Qi Hunt]

On 5/10/05, dipankar das <dipankar_dd@yahoo.com> wrote:
> Hi
>  Does Red hat like Monta vista allow crashing the
> kernel by writing to  "/dev/crash" if not whats the
> easiest way ?

Is it practically useful? How is it used in monta vista?

-- 
Coywolf Qi Hunt
http://sosdg.org/~coywolf/

Re: Crashing red hat linux

[Raj Inguva]

>  Does Red hat like Monta vista allow crashing the
> kernel by writing to  "/dev/crash" if not whats the
> easiest way ?
> 

I used to insmod a driver which calls panic() during module
initialization. I used to do this for testing lkcd.

Raj

Re: Crashing red hat linux

[Coywolf Qi Hunt]

On 5/10/05, Raj Inguva <inguva@gmail.com> wrote:
> >  Does Red hat like Monta vista allow crashing the
> > kernel by writing to  "/dev/crash" if not whats the
> > easiest way ?
> >
> 
> I used to insmod a driver which calls panic() during module
> initialization. I used to do this for testing lkcd.


Now we have crashdump shipped with kexec.

-- 
Coywolf Qi Hunt
http://sosdg.org/~coywolf/

Re: Crashing red hat linux

[Lee Revell]

On Tue, 2005-05-10 at 01:26 -0700, dipankar das wrote:
> Hi
>  Does Red hat like Monta vista allow crashing the
> kernel by writing to  "/dev/crash" if not whats the
> easiest way ?

cat /dev/dsp > /dev/kmem should do it.

Lee

Re: Crashing red hat linux

[James Washer]

Why oh why would one do that?? 

On any recent redhat kernel, simply enable magic sysrq by:
	echo 1 > /proc/sys/kernel/sysrq

Then force a panic at the console by hitting ALT-SysRq-c
or by
	echo c > /proc/sysrq-trigger


On Tue, 10 May 2005 11:42:39 -0400
Lee Revell <rlrevell@joe-job.com> wrote:

> On Tue, 2005-05-10 at 01:26 -0700, dipankar das wrote:
> > Hi
> >  Does Red hat like Monta vista allow crashing the
> > kernel by writing to  "/dev/crash" if not whats the
> > easiest way ?
> 
> cat /dev/dsp > /dev/kmem should do it.
> 
> Lee
> 
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Re: Crashing red hat linux

[Tommy Reynolds]

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Uttered James Washer <washer@trlp.com>, spake thus:

> Why oh why would one do that?? 

So you could check fail-over?  or the crash dump setup?  That's why I sent the patch.

Cheers

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Re: Crashing red hat linux

[James Washer]

My "why oh why" response was directed at the suggestion of "cat /dev/dsp > /dev/kmem should do it"

I understand the many reasons why one might wish to force a panic.


what patch??


 - jim


On Tue, 10 May 2005 13:38:06 -0500
Tommy Reynolds <Tommy.Reynolds@MegaCoder.com> wrote:

> Uttered James Washer <washer@trlp.com>, spake thus:
> 
> > Why oh why would one do that?? 
> 
> So you could check fail-over?  or the crash dump setup?  That's why I sent the patch.
> 
> Cheers
> 

Re: Crashing red hat linux

[Tommy Reynolds]

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Uttered James Washer <washer@trlp.com>, spake thus:

> I understand the many reasons why one might wish to force a panic.
> 
> 
> what patch??

Internal RH patch, many moons ago.

Cheers!

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