linux-kernel - Re: [v6.12] WARNING: at kernel/sched/deadline.c:1995 enqueue_dl_entity (task blocked for more than 28262 seconds)

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Message-ID: <10db7c11-5578-4386-88ae-542ffcaac818@ovn.org>
Date: Tue, 10 Dec 2024 10:28:36 +0100
From: Ilya Maximets <i.maximets@....org>
To: Vineeth Remanan Pillai <vineeth@...byteword.org>
Cc: i.maximets@....org, Peter Zijlstra <peterz@...radead.org>,
 Joel Fernandes <joel@...lfernandes.org>, LKML
 <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...hat.com>,
 Juri Lelli <juri.lelli@...hat.com>,
 Vincent Guittot <vincent.guittot@...aro.org>, vineethrp@...gle.com,
 shraash@...gle.com, marcel.ziswiler@...ethink.co.uk
Subject: Re: [v6.12] WARNING: at kernel/sched/deadline.c:1995
 enqueue_dl_entity (task blocked for more than 28262 seconds)

On 12/10/24 03:58, Vineeth Remanan Pillai wrote:
>> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
>> index fbdca89c677f..1f4b76c1f032 100644
>> --- a/kernel/sched/fair.c
>> +++ b/kernel/sched/fair.c
>> @@ -1159,8 +1159,6 @@ static inline void update_curr_task(struct
>> task_struct *p, s64 delta_exec)
>>         trace_sched_stat_runtime(p, delta_exec);
>>         account_group_exec_runtime(p, delta_exec);
>>         cgroup_account_cputime(p, delta_exec);
>> -       if (p->dl_server)
>> -               dl_server_update(p->dl_server, delta_exec);
>>  }
>>
>>  static inline bool did_preempt_short(struct cfs_rq *cfs_rq, struct
>> sched_entity *curr)
>> @@ -1210,6 +1208,11 @@ s64 update_curr_common(struct rq *rq)
>>         return delta_exec;
>>  }
>>
>> +static inline bool dl_server_active(struct dl_sched_entity *dl_se)
> Sorry a small typo in here. it should be struct sched_dl_entity and
> not dl_sched_entity. The line should be:
> 
> "static inline bool dl_server_active(struct sched_dl_entity *dl_se)"

Sure.  I can try that.

Note:  I did indeed got lucky with the warning after 1 minute the
first time.  The second time I tried the system didn't show any
issues up until 6 hours into the test...

Best regards, Ilya Maximets.