How can I investigate the cause of "watchdog: BUG: soft lockup"?

Jan Kiszka jan.kiszka at
Wed Jul 8 19:14:57 CEST 2020

On 04.07.20 03:56, 孙世龙 sunshilong via Xenomai wrote:
> Hi, list
> I encountered the error of "watchdog: BUG: soft lockup" when I sent
> data through the can bus.
> Could you please give me some hint on how to investigate the cause deeply?
> Thank you for your attention to this matter.

 From the backtrace, it is not yet clear to me which role Xenomai/I-pipe
plays here. Furthermore, it points to an out-of-tree CAN dri (advcan)
which makes it even harder to tell cause and effect apart.

In general, system-level tracing can help in such scenarios to gain an
overview about what is going on.


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