Re: [LKP] [sched] BUG: kernel boot hang

[Steven Rostedt]

On Mon, 16 Feb 2015 19:22:38 +0100
Frederic Weisbecker <fweisbec@xxxxxxxxx> wrote:
 
> Huang Ying hasn't yet reported a Tested-by but I could reproduce (with both function and function_graph tracers btw)
> and the patch fixed it.

Ah right, it's not the recursion from the function tracer that kills
us, it's the recursion from the preempt_enable_notrace() that does...

preempt_schedule_common()
  --> traced
     preempt_disable_notrace();
     preempt_enable_notrace();
     (see's NEED_RESCHED set)
	preempt_schedule_context();
	    preempt_schedule_common();
		--> traced

etc, etc till boom.

-- Steve

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