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[Jürg Häfliger <1916468@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1916468

Title:
  powerpc/eeh-basic.sh in kselftest make P8 node stopped working

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Focal:
  Fix Released

Bug description:
  [Impact]
  When trying to run this test on P8 node entei with Focal kernel, it will try to break 4 devices on Focal, and one of them is using the AHCI driver which doesn't support error recovery:

  $ sudo ./eeh-basic.sh
  0000:00:00.0, Skipped: bridge
  0001:00:00.0, Skipped: bridge
  0020:00:00.0, Skipped: bridge
  0021:00:00.0, Skipped: bridge
  0021:01:00.0, Skipped: bridge
  0021:02:01.0, Skipped: bridge
  0021:02:08.0, Skipped: bridge
  0021:02:09.0, Skipped: bridge
  0021:02:0a.0, Skipped: bridge
  0021:02:0b.0, Skipped: bridge
  0021:02:0c.0, Skipped: bridge
  0021:0d:00.0, Added
  0021:0e:00.0, Added
  0021:0f:00.0, Skipped: bridge
  0021:10:00.0, Added
  0022:00:00.0, Skipped: bridge
  0022:01:00.0, Added
  Found 4 breakable devices...
  Breaking 0021:0d:00.0...
  0021:0d:00.0, waited 0/60
  0021:0d:00.0, waited 1/60
  0021:0d:00.0, waited 2/60
  0021:0d:00.0, waited 3/60
  0021:0d:00.0, waited 4/60
  0021:0d:00.0, waited 5/60
  0021:0d:00.0, waited 6/60
  0021:0d:00.0, waited 7/60
  0021:0d:00.0, waited 8/60
  0021:0d:00.0, Recovered after 9 seconds
  Breaking 0021:0e:00.0...
  0021:0e:00.0, waited 0/60
  0021:0e:00.0, waited 1/60
  ./eeh-basic.sh: 74: sleep: Input/output error
  0021:0e:00.0, waited 2/60
  ./eeh-basic.sh: 74: sleep: Input/output error
  ....
  ./eeh-basic.sh: 74: sleep: Input/output error
  0021:0e:00.0, waited 59/60
  ./eeh-basic.sh: 74: sleep: Input/output error
  0021:0e:00.0, waited 60/60
  ./eeh-basic.sh: 74: sleep: Input/output error
  0021:0e:00.0, Failed to recover!
  Breaking 0021:10:00.0...
  Skipping 0021:10:00.0, Initial PE state is not ok
  Breaking 0022:01:00.0...
  Skipping 0022:01:00.0, Initial PE state is not ok
  3 devices failed to recover (4 tested)
  ./eeh-basic.sh: 81: lspci: Input/output error
  ./eeh-basic.sh: 81: diff: Input/output error
  ./eeh-basic.sh: 82: rm: Input/output error
  ./eeh-basic.sh: 84: test: 3: unexpected operator

  With the driver failed to recovery, the system will start acting up.
  $ ls
  ls: command not found

  And drop into a read-only state

  [Fixes]
  * bbe9064f30f06e ("selftests/eeh: Skip ahci adapters")

  This is only affecting Focal and it can be cherry-picked.

  [Test case]
  Run the eeh-basic.sh script in tools/testing/selftests/powerpc/eeh/ on the affected P8 node, the test should pass without any issue.

  [Where problems could occur]
  This fix is limited to PowerPC testing tool, it should not cause any issue.

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