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From: "Pavel Machek" <pavel@denx.de>
To: cip-dev@lists.cip-project.org
Subject: Re: [cip-dev] BUG: using smp_processor_id() in preemptible [00000000] code: TCPTSK/1809
Date: Sat, 12 Jun 2021 00:34:11 +0200	[thread overview]
Message-ID: <20210611223411.GA28449@amd> (raw)
In-Reply-To: <trinity-17b11b5f-9805-4527-89fb-1f3a0103a164-1623043418611@3c-app-gmx-bap15>


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Hi!

> > I notice you are using -rt kernel. Do you actually need realtime
> > features?
> 
> Yes, I actually need the realtime feature. I have one task which
> needs to run periodically in realtime (triggered every 10ms by an
> external IRQ).

How fast response do you need to the external IRQ?

> > Can you try to reproduce the problem on 4.19.193?
> 
> This is only a problem with the realtime patch. The patch
> introduces migrate_enable which is part of the callstack:
> 
> Jun 1 09:11:46 sicam kernel: [46802.944165] BUG: using smp_processor_id() in preemptible [00000000] code: TCPTSK/1809
> Jun 1 09:11:46 sicam kernel: [46802.944210] caller is
> migrate_enable+0x40/0x488

Fun :-(. As Jan mentioned, testing if it can be reproduced with
4.19.193-rt81 would be useful.

Best regards,
								Pavel

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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  parent reply	other threads:[~2021-06-11 22:34 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-05 13:50 [cip-dev] BUG: using smp_processor_id() in preemptible [00000000] code: TCPTSK/1809 Rainer Kloud
2021-06-06 19:14 ` Pavel Machek
2021-06-07  4:31   ` rainer.kloud
2021-06-07  5:23   ` Rainer Kloud
2021-06-07  8:25     ` Jan Kiszka
2021-06-07 10:18       ` Rainer Kloud
2021-06-10  5:33         ` Jan Kiszka
2021-06-11 22:34     ` Pavel Machek [this message]
2021-06-15  4:56       ` Rainer Kloud

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