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[Jürg Häfliger <1909286@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1927076 ***
    https://bugs.launchpad.net/bugs/1927076

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1909286

Title:
  ubuntu_kernel_selftest will be interrupted with the reuseport_bpf_cpu
  / reuseport_bpf_numa test in net (BUG: Unable to handle kernel
  instruction fetch (NULL pointer?))

Status in ubuntu-kernel-tests:
  Confirmed
Status in The Ubuntu-power-systems project:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Focal:
  Confirmed
Status in linux source package in Hirsute:
  Confirmed

Bug description:
  Issue found with 5.4.0-59.65~18.04.1 P8 node entei and dryden

  It looks like the ubuntu_kernel_selftests will be interrupted when
  running the reuseport_bpf_cpu / reuseport_bpf_numa in net category.

  From the jenkins test log you will see the test didn't finish.

  For node entei:
  07:37:44 DEBUG| [stdout] # selftests: net: reuseport_bpf_cpu
  07:37:44 DEBUG| [stdout] # ---- IPv4 UDP ----
  07:37:44 DEBUG| [stdout] # send cpu 0, receive socket 0
  07:37:44 DEBUG| [stdout] # send cpu 1, receive socket 1
  07:37:44 DEBUG| [stdout] # send cpu 2, receive socket 2
  ...
  07:37:44 DEBUG| [stdout] # send cpu 123, receive socket 123
  07:37:44 DEBUG| [stdout] # send cpu 125, receive socket 125
  07:37:44 DEBUG| [stdout] # send cpu 127, receive socket 127
  07:37:44 DEBUG| [stdout] # ---- IPv6 UDP ----
  07:37:44 DEBUG| [stdout] # send cpu 0, receive socket 0
  07:37:44 DEBUG| [stdout] # send cpu 1, receive socket 1
  07:37:44 DEBUG| [stdout] # send cpu 2, receive socket 2
  ....
  07:37:44 DEBUG| [stdout] # send cpu 123, receive socket 123
  07:37:44 DEBUG| [stdout] # send cpu 125, receive socket 125
  07:37:44 DEBUG| [stdout] # send cpu 127, receive socket 127
  07:37:44 DEBUG| [stdout] # ---- IPv4 TCP ----
  + ARCHIVE=/var/lib/jenkins/jobs/sru-misc__B-hwe-5.4_ppc64el-generic__using_entei__for_kernel/builds/1/archive
  + scp -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o LogLevel=quiet -r ubuntu@entei:kernel-test-results /var/lib/jenkins/jobs/sru-misc__B-hwe-5.4_ppc64el-generic__using_entei__for_kernel/builds/1/archive

  
  For node dryden:
  08:22:09 DEBUG| [stdout] ok 2 selftests: net: reuseport_bpf_cpu
  08:22:09 DEBUG| [stdout] # selftests: net: reuseport_bpf_numa
  08:22:09 DEBUG| [stdout] # ---- IPv4 UDP ----
  + ARCHIVE=/var/lib/jenkins/jobs/sru-misc__B-hwe-5.4_ppc64el-generic__using_dryden__for_kernel/builds/2/archive
  + scp -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o LogLevel=quiet -r ubuntu@dryden:kernel-test-results /var/lib/jenkins/jobs/sru-misc__B-hwe-5.4_ppc64el-generic__using_dryden__for_kernel/builds/2/archive

  This issue does not exist in Focal 5.4

  Trace back to older Bionic 5.4 kernel:
  * 5.4.0-58.64~18.04.1 - not tested
  * 5.4.0-57.63~18.04.1 - this issue does not exist as the bpf test build is blocking the build of net test
  * 5.4.0-56.62~18.04.1 - missing test result as node modoc is broken
  * 5.4.0-52.57~18.04.1 - no such issue with node modoc

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