Re: [Xen-devel] [qemu-upstream-4.11-testing test] 136184: regressions - FAIL

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Tue, May 21, 2019 at 05:52:12PM +0100, Julien Grall wrote:
> The same error cannot be reproduced on laxton*. Looking at the test history,
> it looks like qemu-upstream-4.12-testing flight has run successfully a few
> times on rochester*. So we may have fixed the error in Xen 4.12.
> 
> Potential candidates would be:
>    - 00c96d7742 "xen/arm: mm: Set-up page permission for Xen mappings earlier 
> on"
>    - f60658c6ae "xen/arm: Stop relocating Xen"
> 
> Ian, is it something the bisector could automatically look at?
> If not, I will need to find some time and borrow the board to bisect the
> issues.

I attempted to do that bisection myself, and the first commit that git
wanted to try, a common commit to both branches, boots just fine.

It turns out that the first commit that fails to boot on rochester is
  e202feb713 xen/cmdline: Fix buggy strncmp(s, LITERAL, ss - s) construct
(even with the "eb8acba82a xen: Fix backport of .." applied)


I did try a few commits from stable-4.12 branches and they all booted
just fine on rochester.


Now about the potential candidates:
>    - 00c96d7742 "xen/arm: mm: Set-up page permission for Xen mappings earlier 
> on"

This commit alone, cherry-picked on top of stable-4.11 makes xen boot on
rochester.

>    - f60658c6ae "xen/arm: Stop relocating Xen"

With that commit applied, xen doesn't build. So I couldn't try to boot
it. (mm.c: In function ‘setup_pagetables’: mm.c:653:42: error: ‘xen_paddr’ 
undeclared )

-- 
Anthony PERARD

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