Re: 2.5.66-mm1

[Ingo Molnar <mingo@elte.hu>]

On Thu, 27 Mar 2003, Andrew Morton wrote:

> That longer Code: line is really handy.
> 
> You died in schedule()->deactivate_task()->dequeue_task().
> 
> static inline void dequeue_task(struct task_struct *p, prio_array_t *array)
> {
> 	array->nr_active--;
> 
> `array' is zero.
> 
> I'm going to Cc Ingo and run away.  Ed uses preempt.

hm, this is an 'impossible' scenario from the scheduler code POV. Whenever
we deactivate a task, we remove it from the runqueue and set p->array to
NULL. Whenever we activate a task again, we set p->array to non-NULL. A
double-deactivate is not possible. I tried to reproduce it with various
scheduler workloads, but didnt succeed.

Mike, do you have a backtrace of the crash you saw?

	Ingo

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"aart@kvack.org">aart@kvack.org</a>