[Bug 1939861] Re: dpdk: ppc64el autopkgtest regressed in release

[Christian Ehrhardt ]

** Description changed:

+ [Impact]
+ 
+  * Some tests (just a small portion of a vast list of tests) is not really
+    breaking due to real issues but just happen to be notorious timeouts
+    or flaky in the Ubuntu build&test environment.
+ 
+  * We have fixed that in Debian and Impish already, but the same behavior 
+    now also affects the MRE of 20.11.3 therefore backport the same test
+    improvements to Hirsute.
+ 
+ [Test Plan]
+ 
+  * Build time and autopkgtests are supposed to work (they are anyway for 
+    an SRU, but for this fix this is exactly the test that we want/need
+    to do)
+ 
+ [Where problems could occur]
+ 
+  * If the patches would be wrong they could have broken the tests, but 
+    that would then just not build and thereby not migrate. OTOH there is
+    theoretical chance that the few disabled tests would have catched 
+    something down the road which they now no more do - but that isn't
+    that much of a regression, more a trade-off that we want to make.
+ 
+ [Other Info]
+  
+  * This initially only affected impish, but later it was found that 
+    Hirsute is affected as well. Therefore on this MRE we want to improve 
+    it here as well.
+  * To be clear this really is flaky, we could have just hit retry a few 
+    times and get through without - but I think we agree that flaky tests 
+    are not really helpful and can cause a lot of pain.
+ 
+ ---
+ 
  dpkg's autopkgtest on ppc64el has regressed in release [1].
  
  This currently blocks pexpect/8.0-2ubuntu1 from migrating to -release.
  
- 
  [1] https://autopkgtest.ubuntu.com/packages/dpdk/impish/ppc64el

** Also affects: util-linux (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Also affects: glibc (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Also affects: pexpect (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Also affects: zlib (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Also affects: dpdk (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** No longer affects: glibc (Ubuntu Hirsute)

** No longer affects: pexpect (Ubuntu Hirsute)

** No longer affects: util-linux (Ubuntu Hirsute)

** No longer affects: zlib (Ubuntu Hirsute)

** Changed in: dpdk (Ubuntu Hirsute)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1939861

Title:
  dpdk: ppc64el autopkgtest regressed in release

Status in dpdk package in Ubuntu:
  Fix Released
Status in glibc package in Ubuntu:
  Invalid
Status in pexpect package in Ubuntu:
  Invalid
Status in util-linux package in Ubuntu:
  Invalid
Status in zlib package in Ubuntu:
  Invalid
Status in dpdk source package in Hirsute:
  Triaged

Bug description:
  [Impact]

   * Some tests (just a small portion of a vast list of tests) is not really
     breaking due to real issues but just happen to be notorious timeouts
     or flaky in the Ubuntu build&test environment.

   * We have fixed that in Debian and Impish already, but the same behavior 
     now also affects the MRE of 20.11.3 therefore backport the same test
     improvements to Hirsute.

  [Test Plan]

   * Build time and autopkgtests are supposed to work (they are anyway for 
     an SRU, but for this fix this is exactly the test that we want/need
     to do)

  [Where problems could occur]

   * If the patches would be wrong they could have broken the tests, but 
     that would then just not build and thereby not migrate. OTOH there is
     theoretical chance that the few disabled tests would have catched 
     something down the road which they now no more do - but that isn't
     that much of a regression, more a trade-off that we want to make.

  [Other Info]
   
   * This initially only affected impish, but later it was found that 
     Hirsute is affected as well. Therefore on this MRE we want to improve 
     it here as well.
   * To be clear this really is flaky, we could have just hit retry a few 
     times and get through without - but I think we agree that flaky tests 
     are not really helpful and can cause a lot of pain.

  ---

  dpkg's autopkgtest on ppc64el has regressed in release [1].

  This currently blocks pexpect/8.0-2ubuntu1 from migrating to -release.

  [1] https://autopkgtest.ubuntu.com/packages/dpdk/impish/ppc64el

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