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SubjectRe: [PATCH] 2.4 and 2.5: remove Alt-Sysrq-L
On Fri, Mar 15, 2002 at 09:54:05AM -0500, Nicholas Berry wrote:
> > I distinctly recall it working perfectly OK in around 2.1.50. I had boxen
> > where /sbin/init was a shell script which would bring up the interfaces,
> > enable routing, and exit.
> That's a different thing, I think.
> That is, 'init exiting' versus 'all the code to prevent init being killed
> is bypassed and init is killed'

Very true.

With all recent kernels, init exiting causes the last of these to trigger:

NORET_TYPE void do_exit(long code)
struct task_struct *tsk = current;

if (in_interrupt())
panic("Aiee, killing interrupt handler!");
if (!tsk->pid)
panic("Attempted to kill the idle task!");
if (tsk->pid == 1)
panic("Attempted to kill init!");

It is this very test that Alt-SysRQ-L is attempting to bypass which causes
the problem.

Russell King ( The developer of ARM Linux

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