A few things, mostly technical notes...

Tuesday, December 21, 2004

How to force a Linux box to panic...

How to force a panic?


[mdlug] netdump on Red Hat ES
GREG WOJTAK GWOJTAK at salliemae.com
Tue Oct 12 09:05:57 EDT 2004

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This is what I needed, but I couldn't get his code to compile, so I
re-wrote it based on the source:

#define __KERNEL__

#include
#include

extern int init_module(void);

int init_module (void)
{
panic(" panic has been called");
return 0;
}

compile with:
# cc -c -o panic.o -DMODULE -I/usr/src/linux-2.4/include panic.c

# file panic.o
panic.o: ELF 32-bit LSB relocatable, Intel 80386, version 1 (SYSV), not
stripped
# insmod panic.o
Warning: kernel-module version mismatch
panic.o was compiled for kernel version 2.4.21-20.ELsmp
while this kernel is version 2.4.21-15.0.4.ELsmp
Warning: loading panic.o will taint the kernel: no license
See http://www.tux.org/lkml/#export-tainted for information about
tainted modules
Warning: loading panic.o will taint the kernel: forced load
Read from remote host sqcjbafi10: Connection timed out
Connection to sqcjbafi10 closed.

Sometimes, there is nothing like the feeling of having the power to
crash a server.

netdump works great, BTW. It sent over a core file and the contents
of what would have gone in syslog to the netdump server, leaving me with
something I can diagnose.




Greg Wojtak
Unix Systems Administrator

4 comments:

AndrewStone said...

There's a small problem with the included code, because of an include being misinterpreted as a xml tag. Looking at the page source, it looks like you actually need:

#include < linux>

AndrewStone said...

Ok, I updated for 2.6 and tested on CentOS 5.0:

panic.c:
#include < linux/kernel.h >

extern int init_module(void);

int init_module (void)
{
panic(" panic has been called");
return 0;
}

#if 0
# Makefile to build on 2.6.X kernels
obj-m += panic.o

all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
#endif

neeko said...

I put a more complete post online at:
http://www.dufault.info/blog/forcibly-triggering-a-kernel-panic-on-linux/

neeko said...

err
http://www.dufault.info/blog/forcibly-triggering-a-kernel-panic-on-linux/

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