Re: [PATCH] testsuite: Add KFAIL to qemumipsel-bookworm

["'MOESSBAUER, Felix' via isar-users" <isar-users@googlegroups.com>]

On Fri, 2026-07-24 at 09:33 +0000, 'MOESSBAUER, Felix' via isar-users
wrote:
> On Fri, 2026-07-24 at 10:48 +0200, Zhihang Wei wrote:
> > On 7/24/26 09:59, Zhihang Wei wrote:
> > > 
> > > On 7/23/26 17:28, 'MOESSBAUER, Felix' via isar-users wrote:
> > > > On Thu, 2026-07-23 at 15:33 +0200, Zhihang Wei wrote:
> > > > > Currently the following error occurs when building qemumipsel-bookworm:
> > > > > ERROR: Task 
> > > > > (mc:qemumipsel-bookworm:./build/../meta/recipes-devtools/sbuild-chroot/sbuild-chroot-host.bb:do_rootfs_install) 
> > > > > failed with exit code '1'
> > > > > The task log shows:
> > > > > Broken libc6-dev:amd64 Depends on linux-libc-dev:amd64 < none @un pH >
> > > > > <snip>
> > > > > The following packages have unmet dependencies:
> > > > >   libc6-dev : Depends: linux-libc-dev but it is not installable
> > > > > E: Unable to correct problems, you have held broken packages.
> > > > Hi, I noticed this as well, but on my side this is a sporadic issue.
> > > > I did not investigate this further, though.
> > > > 
> > > > Felix
> > > > 
> > > 
> > > On my side this occurs consistently. It's not caused by recent changes. I
> > > tested on the old master branch and the problem occurred there as well.
> > > 
> > > Zhihang
> > > 
> > 
> > I was just summarizing recent CI failures and found this error occurs
> > with other targets as well, such as qemuarm64-bookworm and
> > qemuamd64-bookworm, but only sporadically. On qemumipsel-bookworm the
> > error occurs consistently.
> 
> The root-cause of this is the manually modeled dependency chain in
> sbuild-chroot.inc around libgcc-<...> and libstd++-<...>. The
> assumptions made there are not universally valid, especially not when
> packages are taken from debian security (which explains the late
> breakage). This was introduced by Jan to reduce the sbuild install
> times in 2be866677 and d90f75bd00f. Reverting the changes fixes the
> build.

I did some further investigation, which revealed a couple of things:

- the DPKG_ARCH=all packages are always build in the sbuild-chroot-host
(even on ISAR_CROSS_COMPILE=0). That makes sense, as Debian does it
like that. However, it also means the sbuild-chroot-host must be
installable on ISAR_CROSS_COMPILE=0
- the sbuild-chroot-host unconditionally installs a cross-compiling
environment (crossbuild-essential-<arch>). That is unnecessary on
global ISAR_CROSS_COMPILE=0 but unproblematic
- the optimization 2be866677 and d90f75bd00f is also applied
unconditionally, breaking the build

I will send a patch that fixes this by only installing the cross
dependencies in sbuild-chroot-host on ISAR_CROSS_COMPILE=1.

This should fix all issues related to "libc6-dev : Depends: linux-libc-
dev".

Felix

> 
> Still I don't fully understand why this breaks non-deterministically.
> 
> Best regards,
> Felix
> 
> > 
> > Zhihang
> 
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