[PATCH 4/5] don't panic if /sbin/init exits or killed

[Oleg Nesterov]

If the buggy init exits, the kernel panics. I see no point for this. It is very
possible that the system is still usable enough, at least to read the logs and
prepare the bug report.

Change exit_child_reaper() to do BUG() instead of panic().

Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>

--- 25/kernel/exit.c~4_EXIT_DONT_PANIC	2008-03-16 16:49:30.000000000 +0300
+++ 25/kernel/exit.c	2008-03-16 16:49:35.000000000 +0300
@@ -861,8 +861,10 @@ static inline void exit_child_reaper(str
 	if (likely(tsk->group_leader != task_child_reaper(tsk)))
 		return;
 
-	if (tsk->nsproxy->pid_ns == &init_pid_ns)
-		panic("Attempted to kill init!");
+	if (unlikely(tsk->nsproxy->pid_ns == &init_pid_ns)) {
+		printk(KERN_EMERG "Kernel panic - init is killed!\n");
+		BUG();
+	}
 
 	/*
 	 * @tsk is the last thread in the 'cgroup-init' and is exiting.

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