Re: [BUG almost bisected] Splat in dequeue_rt_stack() and build error

[Valentin Schneider]

On 13/09/24 07:08, Paul E. McKenney wrote:
> On Sun, Sep 08, 2024 at 09:32:18AM -0700, Paul E. McKenney wrote:
>>
>> Just following up...
>>
>> For whatever it is worth, on last night's run of next-20240906, I got
>> nine failures out of 100 6-hour runs of rcutorture’s TREE03 scenario.
>> These failures were often, but not always, shortly followed by a hard hang.
>>
>> The warning at line 1995 is the WARN_ON_ONCE(on_dl_rq(dl_se))
>> in enqueue_dl_entity() and the warning at line 1971 is the
>> WARN_ON_ONCE(!RB_EMPTY_NODE(&dl_se->rb_node)) in __enqueue_dl_entity().
>>
>> The pair of splats is shown below, in case it helps.
>
> Again following up...
>
> I am still seeing this on next-20240912, with six failures out of 100
> 6-hour runs of rcutorture’s TREE03 scenario.  Statistics suggests that
> we not read much into the change in frequency.
>
> Please let me know if there are any diagnostic patches or options that
> I should apply.
>

Hey, sorry I haven't forgotten about this, I've just spread myself a bit
too thin and also apparently I'm supposed to prepare some slides for next
week, I'll get back to this soonish.

>                                                       Thanx, Paul
>