[Bug 1847816] Re: storage autopkgtest always fails with linux-{kvm, azure, etc} kernels that don't include scsi_debug module

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~ddstreet/autopkgtest-cloud/+git/autopkgtest-cloud/+merge/377688

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https://bugs.launchpad.net/bugs/1847816

Title:
  storage autopkgtest always fails with linux-{kvm,azure,etc} kernels
  that don't include scsi_debug module

Status in autopkgtest-cloud:
  New
Status in systemd package in Ubuntu:
  Invalid
Status in systemd source package in Xenial:
  Invalid
Status in systemd source package in Bionic:
  Invalid
Status in systemd source package in Disco:
  Invalid
Status in systemd source package in Eoan:
  Invalid
Status in systemd source package in Focal:
  Invalid

Bug description:
  [impact]

  the 'storage' autopkgtest requires the 'scsi_debug' module, and if it
  can't load it (and it's not built-in), the test fails.  On some custom
  kernels, this module is included in the new 'linux-modules-extra-*'
  deb which isn't installed by default, so the test always fails when
  doing a reverse-dep autopkgtest using such a kernel's meta pkg.

  [test case]

  run the 'storage' autopkgtest with a custom kernel that doesn't
  provide the scsi_debug module in the standard linux-modules deb, or
  check the autopkgtest.u.c history, for example:

  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
  /autopkgtest-focal/focal/amd64/s/systemd/20191209_150835_237a5@/log.gz

  [regression potential]

  as this modifies one of the autopkgtest --setup-commands, and assumes
  that all custom 'linux-meta-FLAVOR' kernels have a corresponding
  'linux-modules-extra-FLAVOR' deb (or will match the alternate 'linux-
  image-generic-FLAVOR' naming), a regression would most likely cause
  immediate test failure due to failing to install the proper linux-*
  debs.

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