OK I found the culprit.
It's the fsverity-utils repo here:
https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/fsverity-utils.git/
Commit:
5cd90ca608770 ("Introduce libfsverity")
Which added the following line to the Makefile is causing this build failure:
$(call cc-option,-Wimplicit-fallthrough) \
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https://bugs.launchpad.net/bugs/1882167
Title:
ubuntu_zfs_xfs_generic failed to build on X-4.4
Status in linux package in Ubuntu:
Incomplete
Bug description:
The test compilation will fail with:
cc: error: unrecognized command line option '-Wimplicit-fallthrough'
This build issue does not exist with 4.4.0-180 + gcc
5.4.0-6ubuntu1~16.04.12
Please find attachment for the full build log.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-181-generic 4.4.0-181.211
ProcVersionSignature: Ubuntu 4.4.0-181.211-generic 4.4.223
Uname: Linux 4.4.0-181-generic s390x
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code
2: ls: cannot access '/dev/snd/': No such file or directory
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.23
Architecture: s390x
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211
not found.
CurrentDmesg:
Date: Thu Jun 4 22:56:00 2020
HibernationDevice: RESUME=/dev/mapper/mpatha1
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lspci:
Lsusb: Error: command ['lsusb'] failed with exit code 1:
PciMultimedia:
ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
ProcKernelCmdLine: root=/dev/mapper/kernel01_vg-kernel01_lv crashkernel=196M
BOOT_IMAGE=0
RelatedPackageVersions:
linux-restricted-modules-4.4.0-181-generic N/A
linux-backports-modules-4.4.0-181-generic N/A
linux-firmware 1.157.23
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
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