multipath-tool autopkg test fail on s390

Worked on s390x LPAR as well as in an s390x KVM guest just as is.

I think it is related to
/dev/mapper/control: open failed: Operation not permitted
Failure to communicate with kernel device-mapper driver.
Check that device-mapper is available in the kernel.
Incompatible libdevmapper 1.02.136 (2016-11-05) and kernel driver (unknown version).

The script runs with needs-root anyway, so that isn't it.
But the unavailable kernel driver makes me wonder.

aupkg02 is a z/VM Guest that will be used for that - I don't know of the specific setup details.
I know that there is work ongoing to make this more of a normal *stack setup.

We have
CONFIG_BLK_DEV_DM_BUILTIN=y
CONFIG_BLK_DEV_DM=y
So this should always be there.

But the following executed by one who is allowed on one of the systems should help to debug:
pull-lp-source multipath-tools
cd multipath-tools-0.5.0+git1.656f8865/debian/tests
sudo ./kpartx-file-loopback
# The former should reproduce the error
# Then look why/what might be going on with /dev/mapper/control
ls -laF /dev/mapper/control
lsmod | grep dm
# check dmesg ?
# more?

I need access, help from one with access or have to wait for the new *stack systems

s390x autopkgtest is the only autopkgtests that run in LXD containers unpriviledged, unlike all other autopkgtests. Thus please use isolation-machine for now.

Ok, discussion showed that there is still a LXD in between - thanks xnox.

That said the flags of the tests are incomplete, it needs isolation-machine.

Not considering SRU, once *stack infratstruture is used they will start to work for X&Y.

This bug was fixed in the package multipath-tools - 0.6.4-3ubuntu1

---------------
multipath-tools (0.6.4-3ubuntu1) zesty; urgency=medium

  * Merge from Debian. (LP: #1621340, LP: #1645274) Remaining changes:
    - d/control:
      - Bump udev dependencies
      - multipath-udeb: add sg3-udeb Depends
    - d/rules: Move udev rules to priority 95, because rules that load modules
      should be >90.
    - d/multipath-tools.preinst: modprobe dm-multipath; This will make sure
      that multipathd will be able to start.
    - Split kpartx initramfs bits into kpartx-boot for dmraid (LP: #941874)
      - d/initramfs/kpartx.hook
      - d/kpartx-boot.postinst
      - d/kpartx-boot.postrm
      - d/control: Add kpartx-boot package for dmraid
      - d/rules: Install kpartx initramfs hook
      - d/kpartx.install: install all arch /lib* kpartx udev rules
    - patches (some refreshed to new version) to multipath source
      - d/p/1000--set-umask-in-multipathd.patch: Set umask in multipathd.
      - d/p/path_selector.patch: switch the default path selector
        back to round-robin while service-time isn't available to the installer
        multipath-modules.
      - d/p/kpartx_more_loopback_fixes.patch: fix loopback mounted
        files some more: since we stat() the loopback device node, we can't rely
        on S_ISREG() tests to handle this case, and should look at the device
        itself instead. (LP: #1543430)
      - d/p/enable-find-multipaths.patch: re-enable find_multipaths
        by default -- see the removed 'add_find-multipaths.patch' (LP: #1463046)
   - multipath initramfs fixes for booting from multipathed devices
      - d/initramfs/hooks: also copy wwids file on the installed system to
        ensure all paths come up on boot. (LP: #1479929)
      - d/initramfs/hooks: install multipathd and required directories.
      - d/initramfs/hooks: copy dm-mpath-lvm & multipath udev rules to initramfs
      - d/initramfs/hooks: do not copy kpartx rules to initramfs
      - d/initramfs/local-bottom: remember to stop multipathd.
      - d/initramfs/local-premount: wait for udev to settle before the call to
        resolve_device() in local_mount_root(), so the by-uuid/ symlinks have a
        chance to be updated by the multipath udev rules (LP: #1503286).
      - d/initramfs/local-premount: Run multipath with -B so not to assign names
        nor change /etc/multipath/bindings during initramfs (LP: #1561103)
      - d/rules: install d/initramfs/local-bottom
      - d/rules: install d/initramfs/local-premount
   - Remove partition device nodes of individual paths (for LVM on multipath)
     (LP: #1540401)
   - Disable -fexceptions on multipath-udeb (LP: #1489379): the flag causes
     libchecktur.so to link with libgcc_s.so.1 (even with -static-libgcc),
     which is not available in the installer environment.
     - d/p/disable-fexceptions-udeb.patch: conditionally disable -fexceptions
       with CFLAGS_DISABLE_FEXCEPTIONS.
     - d/rules: set CFLAGS_DISABLE_FEXCEPTIONS to build multipath-udeb.
   - d/tests/kpartx-file-loopback: add an autopkgtest to catch future cases
     where uploads might break kpartx's loopback file handling.
   -...