zram smoke test failed on GCP 4.13 / AWS 4.15, 4.4

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1757937

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

This issue can be spotted on AWS Bionic kernel as well:
20:30:46 DEBUG| modprobe: FATAL: Module zram not found in directory /lib/modules/4.15.0-1002-aws
20:30:46 DEBUG| modprobe: FATAL: Module zram not found in directory /lib/modules/4.15.0-1002-aws

Affecting Xenial AWS kernel as well 4.4.0-1053.62

@Po-Hsu Lin When I build this kernel tag, I see linux-image-extra is built and it has the zram module inside it.

How can I reproduce this issue myself?

For the GCP kernel, yes it's missing the linux-image-extra-4.13.0-1012-gcp package, this issue will gone with that package installed.

However as this package was not installed by default (when the instance got deployed), we had a similar issue for aufs.ko for s390x before:
https://lists.ubuntu.com/archives/kernel-team/2017-March/082978.html

This can be fixed from the test suite or just doing the same thing above.

For the AWS kernel, there is no extra package available.
$ apt-cache search extra| grep linux
linux-image-extra-4.15.0-1001-gcp - Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
linux-image-extra-4.15.0-1002-azure - Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
linux-image-extra-4.15.0-13-generic - Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
linux-image-extra-virtual - Extra drivers for Virtual Linux kernel image
ganglia-modules-linux - Ganglia extra modules for Linux (IO, filesystems, multicpu)
linux-image-extra-4.15.0-1003-azure - Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP

Patch to blacklist these on GCP / AWS has been applied.

http://kernel.ubuntu.com/git/ubuntu/autotest-client-tests.git/commit/?id=40916a0680295d860c09d4c884d4aa86e3853d18
http://kernel.ubuntu.com/git/ubuntu/autotest-client-tests.git/commit/?id=81862bb97d80bf48f6349e21e259475462663f0d

We can close this now.