linux-kernel - Re: [BUG almost bisected] Splat in dequeue_rt

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Message-ID: <xhsmh34m38pdl.mognet@vschneid-thinkpadt14sgen2i.remote.csb>
Date: Fri, 13 Sep 2024 18:55:34 +0200
From: Valentin Schneider <vschneid@...hat.com>
To: paulmck@...nel.org, Chen Yu <yu.c.chen@...el.com>, Peter Zijlstra
 <peterz@...radead.org>, linux-kernel@...r.kernel.org,
 sfr@...b.auug.org.au, linux-next@...r.kernel.org, kernel-team@...a.com
Subject: Re: [BUG almost bisected] Splat in dequeue_rt_stack() and build error

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
>