WARNING in percpu_ref_switch_to_atomic_rcu

[Robert Berger]

Hi,

First of all I am not sure if this is where I should post this e-mail.
Please let me know if it should go to some other place.

I saw that syzbot reported this WARNING[1] and that it also reported
"Unfortunately, I don't have any reproducer for this crash yet."

Well I do have a reproducer ;)

I run some 5.4.x kernel on an i.mx6 board and every time I shut it down
I see this WARNING[2].

Hope this helps.

[1] https://lkml.org/lkml/2020/3/31/853
[2] https://pastebin.com/7Qeav3Jq

Regards,

Robert

--
Robert Berger
Embedded Software Evangelist

Reliable Embedded Systems
Consulting Training Engineering
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email: robert...@reliableembeddedsystems.com
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--

[Dmitry Vyukov]

On Fri, Jun 12, 2020 at 12:29 PM Robert Berger
<robert...@reliableembeddedsystems.com> wrote:
>
> Hi,
>
> First of all I am not sure if this is where I should post this e-mail.
> Please let me know if it should go to some other place.

Hi Robert,

This info may be useful for debugging of the bug. But, yes, we here on
the syzkaller mailing list are the wrong audience. Please add this
info as a reply to the bug report with kernel maintainers in CC.

Thanks