From: Philippe Gerum <rpm@xenomai.org>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Xenomai <xenomai@lists.linux.dev>
Subject: Re: Dovetail 5.15.129 and 6.1.54: New kernel warning on ARM
Date: Sat, 23 Sep 2023 18:47:10 +0200 [thread overview]
Message-ID: <87h6nkygso.fsf@xenomai.org> (raw)
In-Reply-To: <8637b67d-ec5f-4dac-a53d-a473d3f89cfc@siemens.com>
Jan Kiszka <jan.kiszka@siemens.com> writes:
> On 23.09.23 12:07, Philippe Gerum wrote:
>>
>> Jan Kiszka <jan.kiszka@siemens.com> writes:
>>
>>> On 22.09.23 12:21, Philippe Gerum wrote:
>>>>
>>>> Jan Kiszka <jan.kiszka@siemens.com> writes:
>>>>
>>>>> Hi Philippe,
>>>>>
>>>>> something regressed:
>>>>>
>>>>> 2023-09-21T18:21:40 [ 0.000000] ------------[ cut here ]------------
>>>>> 2023-09-21T18:21:40 [ 0.000000] WARNING: CPU: 0 PID: 0 at kernel/irq/pipeline.c:1829 irq_pipeline_init+0xbc/0xe0
>>>>> 2023-09-21T18:21:40 [ 0.000000] Modules linked in:
>>>>> 2023-09-21T18:21:40 [ 0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.15.129+ #1
>>>>> 2023-09-21T18:21:40 [ 0.000000] Hardware name: Generic AM33XX (Flattened Device Tree)
>>>>> 2023-09-21T18:21:40 [ 0.000000] IRQ stage: Linux
>>>>> 2023-09-21T18:21:40 [ 0.000000] [<c03117e0>] (unwind_backtrace) from [<c030bd10>] (show_stack+0x10/0x14)
>>>>> 2023-09-21T18:21:40 [ 0.000000] [<c030bd10>] (show_stack) from [<c1092dd0>] (dump_stack_lvl+0x8c/0xc0)
>>>>> 2023-09-21T18:21:40 [ 0.000000] [<c1092dd0>] (dump_stack_lvl) from [<c0346b00>] (__warn+0x88/0x128)
>>>>> 2023-09-21T18:21:40 [ 0.000000] [<c0346b00>] (__warn) from [<c108ea28>] (warn_slowpath_fmt+0x70/0xc8)
>>>>> 2023-09-21T18:21:40 [ 0.000000] [<c108ea28>] (warn_slowpath_fmt) from [<c171d37c>] (irq_pipeline_init+0xbc/0xe0)
>>>>> 2023-09-21T18:21:40 [ 0.000000] [<c171d37c>] (irq_pipeline_init) from [<c1700fec>] (start_kernel+0x4ec/0x6d8)
>>>>> 2023-09-21T18:21:40 [ 0.000000] [<c1700fec>] (start_kernel) from [<00000000>] (0x0)
>>>>> 2023-09-21T18:21:40 [ 0.000000] ---[ end trace 58996bc4bee07162 ]---
>>>>>
>>>>> https://source.denx.de/Xenomai/xenomai-images/-/jobs/693461#L544
>>>>> https://source.denx.de/Xenomai/xenomai-images/-/jobs/693455#L543
>>>>>
>>>>> Not seeing this with latest 5.10-dovetail.
>>>>>
>>>>
>>>> This means the CI runs a SMP kernel on this uniprocessor SoC. It's fine
>>>> except for latency measurement - the impact of the SMP glue on the worst
>>>> case figure is noticeable in this case (+10%). Anyway, I'll work around
>>>> this.
>>>
>>> Yes, we are running the same kernel config on arm in xenomai-images.
>>> Given that you basically can't buy new single-core SOCs anymore, it's
>>> more important to test and qualify SMP than UP.
>>>
>>
>> You are not testing much of the SMP capabilities on a bbb anyway, but I
>> get the idea. The warning is fixed upstream, including v5.10.y which
>> also had the issue - SMP was most likely disabled for this one in the CI
>> image.
>
> Nope, we are using the same defconfig for all kernel versions (except
> for old 4.4 on BBB).
>
Then something looks fishy, because there is no way the INTC omap
controller would allocate IPIs, therefore CALL_FUNCTION_OOB_IPI would
yield 3 due to ipi_irq_base being zero. I guess that a random device IRQ
was successfully but spuriously hooked on v5.10.y then (i.e. IRQ3).
--
Philippe.
prev parent reply other threads:[~2023-09-23 16:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-22 6:43 Dovetail 5.15.129 and 6.1.54: New kernel warning on ARM Jan Kiszka
2023-09-22 10:21 ` Philippe Gerum
2023-09-22 11:03 ` Jan Kiszka
2023-09-23 10:07 ` Philippe Gerum
2023-09-23 12:28 ` Jan Kiszka
2023-09-23 16:47 ` Philippe Gerum [this message]
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