On Fri, 5 Oct 2018 at 11:09, Marek Szyprowski [off-list ref] wrote:

Hi All,

On 2018-09-19 11:49, Russell King wrote:

quoted

In big.Little systems, some CPUs require the Spectre workarounds in
paths such as the context switch, but other CPUs do not.  In order
to handle these differences, we need per-CPU vtables.

We are unable to use the kernel's per-CPU variables to support this
as per-CPU is not initialised at times when we need access to the
vtables, so we have to use an array indexed by logical CPU number.

Signed-off-by: Russell King <redacted>

This patch causes lots of kernel 'BUG' messages on all Samsung Exynos
boards.  It started to appear since it has been merged to linux-next
on 20181002.  I wonder if this issue is Exynos specific or there are
some patches missing in linux-next, which should fix those 'BUGS'.
If this is Exynos specific, please let us know what should be changed
in Exynos platform code to avoid this issue.

Thanks Marek for narrowing this down.

I confirm. All my Exynos boards experience this. Full logs:
https://krzk.eu/#/builders/1/builds/2811/steps/12/logs/serial0

Best regards,
Krzysztof