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