crashing fresbsd 5.1-current?

Joshua Oreman oremanj at
Wed May 21 17:18:37 PDT 2003

On Wed, May 21, 2003 at 06:39:27AM -0600 or thereabouts, Aaron Wohl seemed to write:
> How do I crash freebsd? I changed the dump* stuff in /etc/rc.conf.  I
> want to make sure it works.  I looked at man shutdown and man poweroff
> but I dont see a crash option.  There should be some option to a system
> call you need to be root to do that internaly does panic("test crash") ?

Yep. man 2 reboot - especially RB_DUMP. It doesn't panic, but it dumps core.
Try this:

$ cat > crash.c <<EOF
#include <unistd.h>
#include <sys/reboot.h>

int main()
	reboot (RB_DUMP | RB_AUTOBOOT);
	return 255;
$ gcc -o crash crash.c
$ su
# ./crash

If you were a developer, and wanted to have a little more fun, you
could make a KLD that created a /dev/panic device. Then, something

# echo "I wonder how big a security hole this is..." > /dev/panic

would panic with the specified message. See the Developer's Handbook.

-- Josh

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