[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3869: Intermittent allmydata.test.test_storage_http.GenericHTTPAPITests.test_bad_authentication failure

[Tahoe-LAFS]

#3869: Intermittent
allmydata.test.test_storage_http.GenericHTTPAPITests.test_bad_authentication
failure
-------------------------+-----------------------
     Reporter:  exarkun  |      Owner:
         Type:  defect   |     Status:  new
     Priority:  normal   |  Milestone:  undecided
    Component:  unknown  |    Version:  n/a
   Resolution:           |   Keywords:
Launchpad Bug:           |
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Comment (by exarkun):

 Some observations:

 * These seem to happen on two newly configured CI jobs (the new NixOS jobs
 that replaced the old ones)
 * These seem to happen when concurrency is high (the old CI jobs limited
 trial to 3 workers, the new CI jobs limit trial to 8 workers)

 I tried to investigate on Friday but I ran into a lot of bugs and missing
 features in trial's concurrent runner ("disttrial") feature that sucked up
 all the time I put in, as well as other random unrelated-but-blocking
 problems in Twisted's test suite.

 It would be great to be able to reproduce the problem off of CI.  In
 principle this should be doable since CI runs in a Docker image and uses
 reproducible-build Nix expressions.  In practice maybe the problem depends
 on timing that comes from the particular hardware or load on the real CI
 runner environment ...

 I think that's worth trying, at least.  Failing that, we could try just
 cranking concurrency down on these jobs (back to 3, I guess) and see if
 that helps.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3869#comment:3>
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