Public bug reported:
This problem is exposed by a combination of conditions:
- For s390x arch (because of bootloader used (zipl))
- Attempting to test an HWE kernel (version > initially released version)
- Deployment start based on a LTS server image using the GA (initially
released) kernel
The special way zipl works is that it only maintains the most recently
installed kernel as the one to use by default on next boot and the
kernel used before as the alternative fallback. So the order of
installing kernels matters.
Deployment of ADT test environments seem to start based on an image that uses
the initially released kernel (GA kernel). This is done by selecting the
linux-generic meta. The next step seems to be to install the packages for which
testing was requested (triggers). When we try to test the HWE kernel this might
install a version of the kernel which is higher than the base image kernel.
When this step completes the HWE kernel is the most recently installed one and
the GA kernel is the previously installed one. At this point a reboot would
come up with the kernel to test.
Following the trigger installation however there is a dist-upgrade run for the
deployed system. And quite often there is an updated GA kernel available as
well. Which then becomes the most-recently installed one and rebooting after
this comes up with the GA kernel and not the HWE kernel requested by the
trigger.
This causes the test run to be matched against the wrong kernel and the
HWE kernel reports testing to be missing.
** Affects: autopkgtest (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2116165
Title:
Failing to boot requested kernel on s390x
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