Manual kernel panic

[Seeker]

How do I intentionally make kernel into panicing by using some cmd or key combination as a root? :stud

 

[crsd]

> sysctl -d debug.kdb.panic
debug.kdb.panic: set to panic the kernel

Happy panic'ing.

 

[aragon]

I think you need ddb(4) compiled in, and to escape to it possibly Ctrl+Alt+ESC depending on your keymap(5).

 

[Seeker]

> sysctl -d debug.kdb.panic
debug.kdb.panic: set to panic the kernel

Nothing happens, even after reboot.
I have GENERIC kernel.

Is it true, that I have to compile ddb as aragon said?

 

[Beastie]

Nothing happens, even after reboot.
I have GENERIC kernel.

Is it true, that I have to compile ddb as aragon said?

Read ddb(4):

In order to enable kernel debugging facilities include:
options KDB
options DDB

Do you see any of these options in the GENERIC kernel configuration /usr/src/sys/i386/conf/GENERIC?

 

[crsd]

Read ddb(4):


Do you see any of these options in the GENERIC kernel configuration /usr/src/sys/i386/conf/GENERIC?

Yes, I do, on -CURRENT and always forgetting about them, sorry.

 

[SirDice]

AFAIK the ctrl-alt-esc key combination invokes the debugger. This isn't really a panic. If you want a 'real' panic this should probably do:

#include <sys/types.h>
#include <sys/systm.h>

main() {
panic("Danger Will Robinson, danger!");
}

See panic(9).

 

[Seeker]

Hey guys! I just found something. :stud

So... Theory is to do something, at the lowest layer possible and then get rid of all surplus layers.

First we need to do:

# sysctl machdep.enable_panic_key=1

Now we need to create panic keyboard binding, which doesn't exist with default FreeBSD's setup - "us"

To this list:

kbdmap -p

I need to add panic, which is activated (As I have choosen), by pressing Esc + p

So to the current kbd layout, I need to append just this one panic button

Now, how do I add and where: (I got to run now, so)

panic 'esc' ( 'p' )

Then panic would be achieved by pressing Esc+p