Re: [PATCH 5.15 000/159] 5.15.116-rc1 review

[Guenter Roeck]

On 6/9/23 12:06, Linus Torvalds wrote:
> On Fri, Jun 9, 2023 at 11:42 AM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> > I managed to revise my bisect script sufficiently enough to get reliable
> > results. It looks like the culprit is commit 503e554782c9 (" debugobject:
> > Ensure pool refill (again)"); see bisect log below. Bisect on four
> > different systems all have the same result. After reverting this patch,
> > I do not see the problem anymore (again, confirmed on four different
> > systems).
>
> Does this happen on mainline too? It's commit 0af462f19e63 in the upstream tree.
>
> It was in 6.4-rc1, and I see a clean result from you at least for
> -rc2, so for some reason it sounds like upstream is ok. But I don't
> really see why that would be the case...

I see the problem only in v5.15.y, to the point where it is almost
impossible to get a clean test of all arm-v7 systems. Affected are
npcm (Nuvoton) boards (kudo-bmc, quanta-gsj, npcm750-evb) as well as
orangepi-pc. I don't see it in any other branch or with any other
platform/architecture.

Mainline is fine; I have not seen any problems since -rc2.

I have no idea what is going on either, only that I can reliably
reproduce the problem (and of course it disappears if CONFIG_DEBUG_OBJECTS
is disabled).

Guenter