[tahoe-lafs-trac-stream] [tahoe-lafs] #1700: nondeterminstic failure of test_filesystem_with_cli_in_subprocess due to timeout

[tahoe-lafs]

#1700: nondeterminstic failure of test_filesystem_with_cli_in_subprocess due to
timeout
----------------------------+---------------------------------------
     Reporter:  davidsarah  |      Owner:  somebody
         Type:  defect      |     Status:  new
     Priority:  normal      |  Milestone:  1.9.2
    Component:  code        |    Version:  1.9.1
   Resolution:              |   Keywords:  test heisenbug introducer
Launchpad Bug:              |
----------------------------+---------------------------------------
Description changed by davidsarah:

Old description:

> {{{
>     test_filesystem_with_cli_in_subprocess ... Traceback (most recent
> call last):
>   File "/usr/local/lib/python2.7/dist-packages/Twisted-11.0.0-py2.7
> -linux-x86_64.egg/twisted/internet/defer.py", line 133, in maybeDeferred
>     result = f(*args, **kw)
>   File "/home/zooko/playground/tahoe-
> lafs/pristine/src/allmydata/util/pollmixin.py", line 34, in _poll
>     raise TimeoutError("PollMixin never saw %s return True" % check_f)
> allmydata.util.pollmixin.TimeoutError: PollMixin never saw <bound method
> SystemTest._check_connections of <allmydata.test.test_system.SystemTest
> testMethod=tes
> t_filesystem_with_cli_in_subprocess>> return True
> [ERROR]
> }}}
>
> warner wrote:
> > there's a function-scoped variable in the test named "introducer", and
> a function that closes over it called _wait_until_idle(), which polls
> it's "outstanding message" count waiting for it to drop to zero
> > then later, the introducer gets replaced with a new one
> > _wait_until_idle is still watching the old introducer, and doesn't
> notice the outstanding messages on the new one

New description:

 {{{
     test_filesystem_with_cli_in_subprocess ... Traceback (most recent call
 last):
   File "/usr/local/lib/python2.7/dist-packages/Twisted-11.0.0-py2.7-linux-
 x86_64.egg/twisted/internet/defer.py", line 133, in maybeDeferred
     result = f(*args, **kw)
   File "/home/zooko/playground/tahoe-
 lafs/pristine/src/allmydata/util/pollmixin.py", line 34, in _poll
     raise TimeoutError("PollMixin never saw %s return True" % check_f)
 allmydata.util.pollmixin.TimeoutError: PollMixin never saw <bound method
 SystemTest._check_connections of <allmydata.test.test_system.SystemTest
 testMethod=tes
 t_filesystem_with_cli_in_subprocess>> return True
 [ERROR]
 }}}

 warner wrote:
 > there's a function-scoped variable in the test named "{{{introducer}}}",
 and a function that closes over it called {{{_wait_until_idle()}}}, which
 polls its "outstanding message" count waiting for it to drop to zero
 >
 > then later, the introducer gets replaced with a new one
 >
 > {{{_wait_until_idle}}} is still watching the old introducer, and doesn't
 notice the outstanding messages on the new one

--

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1700#comment:1>
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