[gentoo-user] How can I trigger kernel panic?

[gentoo-user] How can I trigger kernel panic?

[Jarry]

Hi,

my question might seem silly, but I have reason for it:
I have heard there is way to auto-reboot linux after kernel
panic using "kernel.panic=<time>" in /etc/sysctl.conf.

This might come handy as my server is far from me and I do
not have any remote console. But I would like to test it
and see if it works (first on my desktop).

So my question is: Can I somehow deliberately trigger
"kernel panic" (or "kernel oops")?

Jarry
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Re: [gentoo-user] How can I trigger kernel panic?

[ZHANG, Le]

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On Wed, Mar 14, 2012 at 11:23 AM, Jarry <mr.jarry@gmail.com> wrote:

> Hi,
>
> my question might seem silly, but I have reason for it:
> I have heard there is way to auto-reboot linux after kernel
> panic using "kernel.panic=<time>" in /etc/sysctl.conf.
>
> This might come handy as my server is far from me and I do
> not have any remote console. But I would like to test it
> and see if it works (first on my desktop).
>
> So my question is: Can I somehow deliberately trigger
> "kernel panic" (or "kernel oops")?


For panic, echo c > /proc/sysrq-trigger


>
>
> Jarry
> --
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> Everything else is considered to be spam and therefore deleted.
>
>


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Gentoo/Loongson(龙芯) Developer
http://zhangle.is-a-geek.org

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Re: [gentoo-user] How can I trigger kernel panic?

[Michael Orlitzky]

On 03/14/12 14:23, Jarry wrote:
> Hi,
> 
> my question might seem silly, but I have reason for it:
> I have heard there is way to auto-reboot linux after kernel
> panic using "kernel.panic=<time>" in /etc/sysctl.conf.
> 
> This might come handy as my server is far from me and I do
> not have any remote console. But I would like to test it
> and see if it works (first on my desktop).
> 
> So my question is: Can I somehow deliberately trigger
> "kernel panic" (or "kernel oops")?

If you want to test the auto-reboot, try appending root=/dev/random to
the command line.

Re: [gentoo-user] How can I trigger kernel panic?

[Jarry]

On 14-Mar-12 19:41, ZHANG, Le wrote:
>
> >    So my question is: Can I somehow deliberately trigger
> >    "kernel panic" (or "kernel oops")?
>
> For panic, echo c > /proc/sysrq-trigger

After I issued the above mentioned command, my system
instantly "froze to death". Nothing changed on screen,
no "kernel panic" or "Ooops" screen. Just frozen...

No reaction to keyboard or mouse. No auto-reboot either.
The only thing I could do is to press "Reset". Not exactly
what I have been expecting...

Jarry

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Re: [gentoo-user] How can I trigger kernel panic?

[Michael Mol]

On Thu, Mar 15, 2012 at 12:55 PM, Jarry <mr.jarry@gmail.com> wrote:
> On 14-Mar-12 19:41, ZHANG, Le wrote:
>>
>>
>> >    So my question is: Can I somehow deliberately trigger
>> >    "kernel panic" (or "kernel oops")?
>>
>> For panic, echo c > /proc/sysrq-trigger
>
>
> After I issued the above mentioned command, my system
> instantly "froze to death". Nothing changed on screen,
> no "kernel panic" or "Ooops" screen. Just frozen...
>
> No reaction to keyboard or mouse. No auto-reboot either.
> The only thing I could do is to press "Reset". Not exactly
> what I have been expecting...

Were you running under X? The panic would have killed X, which
wouldn't have released control over the video hardware.

There's a SysRq sequence to get around this, but I don't remember it.

-- 
:wq

Re: [gentoo-user] How can I trigger kernel panic?

[Mick]

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On Thursday 15 Mar 2012 17:02:15 Michael Mol wrote:
> On Thu, Mar 15, 2012 at 12:55 PM, Jarry <mr.jarry@gmail.com> wrote:
> > On 14-Mar-12 19:41, ZHANG, Le wrote:
> >> >    So my question is: Can I somehow deliberately trigger
> >> >    "kernel panic" (or "kernel oops")?
> >> 
> >> For panic, echo c > /proc/sysrq-trigger
> > 
> > After I issued the above mentioned command, my system
> > instantly "froze to death". Nothing changed on screen,
> > no "kernel panic" or "Ooops" screen. Just frozen...
> > 
> > No reaction to keyboard or mouse. No auto-reboot either.
> > The only thing I could do is to press "Reset". Not exactly
> > what I have been expecting...
> 
> Were you running under X? The panic would have killed X, which
> wouldn't have released control over the video hardware.
> 
> There's a SysRq sequence to get around this, but I don't remember it.

Ctrl+Alt+

R E I S U B

(busier in reverse)

After a E or I you should be back into a console, unless things are badly 
screwed.
-- 
Regards,
Mick

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Re: [gentoo-user] How can I trigger kernel panic?

[Michael Mol]

On Thu, Mar 15, 2012 at 3:17 PM, Mick <michaelkintzios@gmail.com> wrote:
> On Thursday 15 Mar 2012 17:02:15 Michael Mol wrote:
>> On Thu, Mar 15, 2012 at 12:55 PM, Jarry <mr.jarry@gmail.com> wrote:
>> > On 14-Mar-12 19:41, ZHANG, Le wrote:
>> >> >    So my question is: Can I somehow deliberately trigger
>> >> >    "kernel panic" (or "kernel oops")?
>> >>
>> >> For panic, echo c > /proc/sysrq-trigger
>> >
>> > After I issued the above mentioned command, my system
>> > instantly "froze to death". Nothing changed on screen,
>> > no "kernel panic" or "Ooops" screen. Just frozen...
>> >
>> > No reaction to keyboard or mouse. No auto-reboot either.
>> > The only thing I could do is to press "Reset". Not exactly
>> > what I have been expecting...
>>
>> Were you running under X? The panic would have killed X, which
>> wouldn't have released control over the video hardware.
>>
>> There's a SysRq sequence to get around this, but I don't remember it.
>
> Ctrl+Alt+
>
> R E I S U B
>
> (busier in reverse)
>
> After a E or I you should be back into a console, unless things are badly
> screwed.

Is that Ctrl+Alt+SysRq+(R E I S U B), or is the SysRq key not actually used?



-- 
:wq

Re: [gentoo-user] How can I trigger kernel panic?

[Neil Bothwick]

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On Thu, 15 Mar 2012 15:25:43 -0400, Michael Mol wrote:

> Is that Ctrl+Alt+SysRq+(R E I S U B), or is the SysRq key not actually
> used?

Alt+SysReq+{R E I S U B}


-- 
Neil Bothwick

Did you know that eskimos have 17 different words for linguist?

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Re: [gentoo-user] How can I trigger kernel panic?

[Paul Hartman]

On Thu, Mar 15, 2012 at 2:25 PM, Michael Mol <mikemol@gmail.com> wrote:
> On Thu, Mar 15, 2012 at 3:17 PM, Mick <michaelkintzios@gmail.com> wrote:
>> On Thursday 15 Mar 2012 17:02:15 Michael Mol wrote:
>>> On Thu, Mar 15, 2012 at 12:55 PM, Jarry <mr.jarry@gmail.com> wrote:
>>> > On 14-Mar-12 19:41, ZHANG, Le wrote:
>>> >> >    So my question is: Can I somehow deliberately trigger
>>> >> >    "kernel panic" (or "kernel oops")?
>>> >>
>>> >> For panic, echo c > /proc/sysrq-trigger
>>> >
>>> > After I issued the above mentioned command, my system
>>> > instantly "froze to death". Nothing changed on screen,
>>> > no "kernel panic" or "Ooops" screen. Just frozen...
>>> >
>>> > No reaction to keyboard or mouse. No auto-reboot either.
>>> > The only thing I could do is to press "Reset". Not exactly
>>> > what I have been expecting...
>>>
>>> Were you running under X? The panic would have killed X, which
>>> wouldn't have released control over the video hardware.
>>>
>>> There's a SysRq sequence to get around this, but I don't remember it.
>>
>> Ctrl+Alt+
>>
>> R E I S U B
>>
>> (busier in reverse)
>>
>> After a E or I you should be back into a console, unless things are badly
>> screwed.
>
> Is that Ctrl+Alt+SysRq+(R E I S U B), or is the SysRq key not actually used?

Sysrq is definitely required :) Ctrl, on the other hand, is optional.
And AltGr may be substituted for Alt.

Re: [gentoo-user] How can I trigger kernel panic?

[Mick]

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On Thursday 15 Mar 2012 19:36:16 Paul Hartman wrote:
> On Thu, Mar 15, 2012 at 2:25 PM, Michael Mol <mikemol@gmail.com> wrote:
> > On Thu, Mar 15, 2012 at 3:17 PM, Mick <michaelkintzios@gmail.com> wrote:
> >> On Thursday 15 Mar 2012 17:02:15 Michael Mol wrote:
> >>> On Thu, Mar 15, 2012 at 12:55 PM, Jarry <mr.jarry@gmail.com> wrote:
> >>> > On 14-Mar-12 19:41, ZHANG, Le wrote:
> >>> >> >    So my question is: Can I somehow deliberately trigger
> >>> >> >    "kernel panic" (or "kernel oops")?
> >>> >> 
> >>> >> For panic, echo c > /proc/sysrq-trigger
> >>> > 
> >>> > After I issued the above mentioned command, my system
> >>> > instantly "froze to death". Nothing changed on screen,
> >>> > no "kernel panic" or "Ooops" screen. Just frozen...
> >>> > 
> >>> > No reaction to keyboard or mouse. No auto-reboot either.
> >>> > The only thing I could do is to press "Reset". Not exactly
> >>> > what I have been expecting...
> >>> 
> >>> Were you running under X? The panic would have killed X, which
> >>> wouldn't have released control over the video hardware.
> >>> 
> >>> There's a SysRq sequence to get around this, but I don't remember it.
> >> 
> >> Ctrl+Alt+
> >> 
> >> R E I S U B
> >> 
> >> (busier in reverse)
> >> 
> >> After a E or I you should be back into a console, unless things are
> >> badly screwed.
> > 
> > Is that Ctrl+Alt+SysRq+(R E I S U B), or is the SysRq key not actually
> > used?
> 
> Sysrq is definitely required :) Ctrl, on the other hand, is optional.
> And AltGr may be substituted for Alt.

Oops!  yes, I meant to write SysRq ... sorry!
-- 
Regards,
Mick

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Re: [gentoo-user] How can I trigger kernel panic?

[Claudio Roberto França Pereira]

Just to be sure, r e i s u b may be input in low case, without shift, right?

Like hold Alt + SysRq and type r e i s u b then release Alt + SysRq?

[gentoo-user] Re: How can I trigger kernel panic?

[Nikos Chantziaras]

On 15/03/12 21:45, Claudio Roberto França Pereira wrote:
> Just to be sure, r e i s u b may be input in low case, without shift, right?
>
> Like hold Alt + SysRq and type r e i s u b then release Alt + SysRq?


http://en.wikipedia.org/wiki/Magic_SysRq_key

Re: [gentoo-user] How can I trigger kernel panic?

[Paul Hartman]

On Thu, Mar 15, 2012 at 2:45 PM, Claudio Roberto França Pereira
<spideybr@gmail.com> wrote:
> Just to be sure, r e i s u b may be input in low case, without shift, right?
>
> Like hold Alt + SysRq and type r e i s u b then release Alt + SysRq?
>

correct! :)

Re: [gentoo-user] How can I trigger kernel panic?

[Dale]

Claudio Roberto França Pereira wrote:
> Just to be sure, r e i s u b may be input in low case, without shift, right?
> 
> Like hold Alt + SysRq and type r e i s u b then release Alt + SysRq?
> 
> 


As the most experienced user of SysReq, that is correct.  Thank hal for
all the experience too.  That #$*%^ *$&%^#*$&% piece of software.  I
hope udev follows that thing.  ROFL

Dale

:-)  :-)

-- 
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how you interpreted my words!

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Re: [gentoo-user] How can I trigger kernel panic?

[Bruce Hill, Jr.]

On March 14, 2012 at 2:41 PM "ZHANG, Le" <r0bertz@gentoo.org> wrote:

> On Wed, Mar 14, 2012 at 11:23 AM, Jarry <mr.jarry@gmail.com> wrote:
>
> > Hi,
> >
> > my question might seem silly, but I have reason for it:
> > I have heard there is way to auto-reboot linux after kernel
> > panic using "kernel.panic=<time>" in /etc/sysctl.conf.
> >
> > This might come handy as my server is far from me and I do
> > not have any remote console. But I would like to test it
> > and see if it works (first on my desktop).
> >
> > So my question is: Can I somehow deliberately trigger
> > "kernel panic" (or "kernel oops")?
>
>
> For panic, echo c > /proc/sysrq-trigger
>
> --
> Zhang Le, Robert
> Gentoo/Loongson(龙芯) Developer
> http://zhangle.is-a-geek.org


Nasty way to do it, but I thought that should be:

echo b > / proc / sysrq-trigger

Isn't b for reboot?
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