Re: [sched] 10e7071b2f: BUG:kernel_NULL_pointer_dereference,address

[Valentin Schneider]

On 07/11/2019 12:15, Quentin Perret wrote:
> On Thursday 07 Nov 2019 at 12:09:22 (+0000), Quentin Perret wrote:
>> sched_move_task() follows what Peter called the 'change' pattern, so I'm
>> thinking this is most likely the same issue. Dropping the lock causes an
>> unmitigated race between sched_move_task() and pick_next_task_dl(), so
>> hilarity ensues (set_next_task() being called twice for instance).
> 
> Bah, scratch that. 10e7071b2 is clearly before the pick_next_task()
> rework, so that's not it :(
> 

And besides we don't drop the lock until reaching pick_next_task_fair(),
and the splat says it died on pick_next_task_dl() which happens earlier.

> Quentin
>