[Bug 2027575] Re: autopkgtest net is failing on 6.2 kernels with 'System is deadlocked on memory'

[Benjamin Drung]

Verified successsful autopkgtest runs:

initramfs-tools/0.140ubuntu13.3 on jammy:

* amd64: https://autopkgtest.ubuntu.com/results/autopkgtest-jammy/jammy/amd64/i/initramfs-tools/20230716_110537_df31f@/log.gz
* arm64: https://autopkgtest.ubuntu.com/results/autopkgtest-jammy/jammy/arm64/i/initramfs-tools/20230714_224812_f1860@/log.gz
* armhf: https://autopkgtest.ubuntu.com/results/autopkgtest-jammy/jammy/armhf/i/initramfs-tools/20230714_215559_96d76@/log.gz
* ppc64el: https://autopkgtest.ubuntu.com/results/autopkgtest-jammy/jammy/ppc64el/i/initramfs-tools/20230714_213915_6880a@/log.gz
* s390x: https://autopkgtest.ubuntu.com/results/autopkgtest-jammy/jammy/s390x/i/initramfs-tools/20230715_001131_6f9f5@/log.gz

initramfs-tools/0.142ubuntu2.1 on lunar:

* amd64: https://autopkgtest.ubuntu.com/results/autopkgtest-lunar/lunar/amd64/i/initramfs-tools/20230715_025637_9fc82@/log.gz
* arm64: https://autopkgtest.ubuntu.com/results/autopkgtest-lunar/lunar/arm64/i/initramfs-tools/20230714_221530_8c679@/log.gz
* armhf: https://autopkgtest.ubuntu.com/results/autopkgtest-lunar/lunar/armhf/i/initramfs-tools/20230714_214804_7cdef@/log.gz
* ppc64el: https://autopkgtest.ubuntu.com/results/autopkgtest-lunar/lunar/ppc64el/i/initramfs-tools/20230714_213745_c92c7@/log.gz
* s390x: https://autopkgtest.ubuntu.com/results/autopkgtest-lunar/lunar/s390x/i/initramfs-tools/20230714_231328_b0a19@/log.gz

** Tags removed: verification-needed verification-needed-jammy verification-needed-lunar
** Tags added: verification-done verification-done-jammy verification-done-lunar

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https://bugs.launchpad.net/bugs/2027575

Title:
  autopkgtest net is failing on 6.2 kernels with 'System is deadlocked
  on memory'

Status in initramfs-tools package in Ubuntu:
  Fix Released
Status in initramfs-tools source package in Jammy:
  Fix Committed
Status in initramfs-tools source package in Lunar:
  Fix Committed

Bug description:
  [Impact]
  In debian/tests/run-image we instantiate an image with 512Mb of ram, but recent jammy/lunar 6.2 kernels need more than that.

  Example of a test failure:
  https://autopkgtest.ubuntu.com/results/autopkgtest-lunar/lunar/amd64/i/initramfs-tools/20230619_135049_ab1cb@/log.gz

  'net' test fails with a kernel panic due to out-of-memory.

  It also relies on an existing and working cloud image. If the cloud
  image is not available, the test will silently succeed.

  [Fix]

  The net autopkgtest was ported to the common test framework in
  initramfs-tools 0.142ubuntu3. This makes the test more robust by
  relying on the minimum needed for the integration test.

  [Test Plan]

  Check that the autopkgtest succeed or test it manually:

  1. Download a lunar image:
  $ autopkgtest-buildvm-ubuntu-cloud -v -a amd64 -r lunar
  2. Run autotestpkg tests from initramfs-tools package. The "net" test is the one that depends on the image instantiated by 'run-image'. The testcase should complete successfully without the kernel panic.
  $ autopkgtest initramfs-tools -- qemu autopkgtest-lunar-amd64.img

  [Where problems could occur]
  The usage of a larger image for the tests could fail if the the test system is low on ram size.

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