zram module is missing in linux-azure

[Marcelo Cerri]

ubuntu_zram_smoke_test regression test is failing due to the missing module zram:

http://10.246.72.46/4.15.0-1004.4-azure/bionic-linux-azure-azure-4.15.0-Basic_A1-ubuntu_zram_smoke_test/ubuntu_zram_smoke_test/results/ubuntu_zram_smoke_test.zram-smoke-test/debug/ubuntu_zram_smoke_test.zram-smoke-test.DEBUG.html

[Brad Figg (brad-figg)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-xenial' to 'verification-done-xenial'. If the problem still exists, change the tag 'verification-needed-xenial' to 'verification-failed-xenial'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-azure - 4.15.0-1008.8

---------------
linux-azure (4.15.0-1008.8) bionic; urgency=medium

  * linux-azure: 4.15.0-1008.8 -proposed tracker (LP: #1766025)

  [ Ubuntu: 4.15.0-19.20 ]

  * linux: 4.15.0-19.20 -proposed tracker (LP: #1766021)
  * Kernel 4.15.0-15 breaks Dell PowerEdge 12th Gen servers (LP: #1765232)
    - Revert "blk-mq: simplify queue mapping & schedule with each possisble CPU"
    - Revert "genirq/affinity: assign vectors to all possible CPUs"

linux-azure (4.15.0-1007.7) bionic; urgency=medium

  * linux-azure: 4.15.0-1007.7 -proposed tracker (LP: #1765495)

  * Miscellaneous Ubuntu changes
    - [Config] updateconfigs after rebase to Ubuntu-4.15.0-18.19
    - [Packaging] update flavour-control.stub for signing changes

  [ Ubuntu: 4.15.0-18.19 ]

  * linux: 4.15.0-18.19 -proposed tracker (LP: #1765490)
  * [regression] Ubuntu 18.04:[4.15.0-17-generic #18] KVM Guest Kernel:
    meltdown: rfi/fallback displacement flush not enabled bydefault (kvm)
    (LP: #1765429)
    - powerpc/pseries: Fix clearing of security feature flags
  * signing: only install a signed kernel (LP: #1764794)
    - [Packaging] update to Debian like control scripts
    - [Packaging] switch to triggers for postinst.d postrm.d handling
    - [Packaging] signing -- switch to raw-signing tarballs
    - [Packaging] signing -- switch to linux-image as signed when available
    - [Config] signing -- enable Opal signing for ppc64el
    - [Packaging] printenv -- add signing options
  * [18.04 FEAT] Sign POWER host/NV kernels (LP: #1696154)
    - [Packaging] signing -- add support for signing Opal kernel binaries
  * Please cherrypick s390 unwind fix (LP: #1765083)
    - s390/compat: fix setup_frame32
  * Ubuntu 18.04 installer does not detect any IPR based HDD/RAID array [S822L]
    [ipr] (LP: #1751813)
    - d-i: move ipr to storage-core-modules on ppc64el
  * drivers/gpu/drm/bridge/adv7511/adv7511.ko missing (LP: #1764816)
    - SAUCE: (no-up) rename the adv7511 drm driver to adv7511_drm
  * Miscellaneous Ubuntu changes
    - [Packaging] Add linux-oem to rebuild test blacklist.

  [ Ubuntu: 4.15.0-17.18 ]

  * linux: 4.15.0-17.18 -proposed tracker (LP: #1764498)
  * Eventual OOM with profile reloads (LP: #1750594)
    - SAUCE: apparmor: fix memory leak when duplicate profile load

  [ Ubuntu: 4.15.0-16.17 ]

  * linux: 4.15.0-16.17 -proposed tracker (LP: #1763785)
  * [18.04] [bug] CFL-S(CNP)/CNL GPIO testing failed (LP: #1757346)
    - [Config]: Set CONFIG_PINCTRL_CANNONLAKE=y
  * [Ubuntu 18.04] USB Type-C test failed on GLK (LP: #1758797)
    - SAUCE: usb: typec: ucsi: Increase command completion timeout value
  * Fix trying to "push" an already active pool VP (LP: #1763386)
    - SAUCE: powerpc/xive: Fix trying to "push" an already active pool VP
  * hisi_sas: Revert and replace SAUCE patches w/ upstream (LP: #1762824)
    - Revert "UBUNTU: SAUCE: scsi: hisi_sas: export device table of v3 hw to
      userspace"
    - Revert "UBUNTU: SAUCE: scsi: hisi_sas: config for hip08 ES"
    - scsi: hisi_sas: modify some register config for hip08
    - scsi: hisi_sas: add v3 hw MODULE_DEVICE_TABLE()
  * Realtek card reader - RTS5...

[Po-Hsu Lin (cypressyew)]

Hello,
I'm still seeing this on the Bionic Azure kernel.
modprobe: FATAL: Module zram not found in directory /lib/modules/4.15.0-1009-azure

Even on the 4.15.0-1008:
modprobe: FATAL: Module zram not found in directory /lib/modules/4.15.0-1008-azure

[Po-Hsu Lin (cypressyew)]

This is the manual test output on a node deployed with Bionic Azure kernel:
azure@b-la-azure-4-15-0-Standard-D3-blktrace-smoke-test:~$ sudo modprobe zram
modprobe: FATAL: Module zram not found in directory /lib/modules/4.15.0-1011-azure
azure@b-la-azure-4-15-0-Standard-D3-blktrace-smoke-test:~$ cat /boot/config-4.15.0-1011-azure | grep ZRAM
CONFIG_ZRAM=m
CONFIG_ZRAM_WRITEBACK=y

[Po-Hsu Lin (cypressyew)]

It turns out that you need to install linux-modules-extra-4.15.0-1011-azure to get this module.

Khaled, Klebers and I had a discussion before, for the zram module in the gcp kernel.
In the end we decide to disable this test instead of changing the test to add the extra package as its dependency.

I think this is similar to the old aufo.ko story here (although I
believe docker package is more widely used than this)
https://lists.ubuntu.com/archives/kernel-team/2017-March/082978.html

"Docker requires aufs, and the Docker forums suggest that folks bump into
this problem frequently enough ("oh, it turned out that I needed to install
linux-image-extra to get it working")."

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-azure - 4.15.0-1013.13~16.04.2

---------------
linux-azure (4.15.0-1013.13~16.04.2) xenial; urgency=medium

  * linux-azure: 4.15.0-1013.13~16.04.2 -proposed tracker (LP: #1772940)

  * linux-azure: 4.15.0-1013.13 -proposed tracker (LP: #1772930)

  * Switch Build-Depends: transfig to fig2dev (LP: #1770770)
    - [Config] update Build-Depends: transfig to fig2dev

  [ Ubuntu: 4.15.0-23.25 ]

  * linux: 4.15.0-23.25 -proposed tracker (LP: #1772927)
  * arm64 SDEI support needs trampoline code for KPTI (LP: #1768630)
    - arm64: mmu: add the entry trampolines start/end section markers into
      sections.h
    - arm64: sdei: Add trampoline code for remapping the kernel
  * Some PCIe errors not surfaced through rasdaemon (LP: #1769730)
    - ACPI: APEI: handle PCIe AER errors in separate function
    - ACPI: APEI: call into AER handling regardless of severity
  * qla2xxx: Fix page fault at kmem_cache_alloc_node() (LP: #1770003)
    - scsi: qla2xxx: Fix session cleanup for N2N
    - scsi: qla2xxx: Remove unused argument from qlt_schedule_sess_for_deletion()
    - scsi: qla2xxx: Serialize session deletion by using work_lock
    - scsi: qla2xxx: Serialize session free in qlt_free_session_done
    - scsi: qla2xxx: Don't call dma_free_coherent with IRQ disabled.
    - scsi: qla2xxx: Fix warning in qla2x00_async_iocb_timeout()
    - scsi: qla2xxx: Prevent relogin trigger from sending too many commands
    - scsi: qla2xxx: Fix double free bug after firmware timeout
    - scsi: qla2xxx: Fixup locking for session deletion
  * Several hisi_sas bug fixes (LP: #1768974)
    - scsi: hisi_sas: dt-bindings: add an property of signal attenuation
    - scsi: hisi_sas: support the property of signal attenuation for v2 hw
    - scsi: hisi_sas: fix the issue of link rate inconsistency
    - scsi: hisi_sas: fix the issue of setting linkrate register
    - scsi: hisi_sas: increase timer expire of internal abort task
    - scsi: hisi_sas: remove unused variable hisi_sas_devices.running_req
    - scsi: hisi_sas: fix return value of hisi_sas_task_prep()
    - scsi: hisi_sas: Code cleanup and minor bug fixes
  * [bionic] machine stuck and bonding not working well when nvmet_rdma module
    is loaded (LP: #1764982)
    - nvmet-rdma: Don't flush system_wq by default during remove_one
    - nvme-rdma: Don't flush delete_wq by default during remove_one
  * Warnings/hang during error handling of SATA disks on SAS controller
    (LP: #1768971)
    - scsi: libsas: defer ata device eh commands to libata
  * Hotplugging a SATA disk into a SAS controller may cause crash (LP: #1768948)
    - ata: do not schedule hot plug if it is a sas host
  * ISST-LTE:pKVM:Ubuntu1804: rcu_sched self-detected stall on CPU follow by CPU
    ATTEMPT TO RE-ENTER FIRMWARE! (LP: #1767927)
    - powerpc/powernv: Handle unknown OPAL errors in opal_nvram_write()
    - powerpc/64s: return more carefully from sreset NMI
    - powerpc/64s: sreset panic if there is no debugger or crash dump handlers
  * fsnotify: Fix fsnotify_mark_connector race (LP: #1765564)
    - fsnotify: Fix fsnotify_mark_connector race
  * Hang on network interface removal in Xen virtual machine...