Bug 1261445 - Potential bug in threading
Potential bug in threading
Product: Fedora
Classification: Fedora
Component: python (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Charalampos Stratakis
Fedora Extras Quality Assurance
Depends On:
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Reported: 2015-09-09 06:49 EDT by Václav Pavlín
Modified: 2016-07-19 13:50 EDT (History)
10 users (show)

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Doc Type: Bug Fix
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Last Closed: 2016-07-19 13:50:15 EDT
Type: Bug
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Description Václav Pavlín 2015-09-09 06:49:19 EDT
Description of problem:
When running a test suite for cached-property project, I noticed a test for multi-threaded environment fails randomly.

For the reference see the issue I filed against the project: 


Version-Release number of selected component (if applicable):

How reproducible:
Always, if the test runs are repeated long enough.

Steps to Reproduce:
1. Clone & install deps from https://github.com/pydanny/cached-property
2. fail=0; pass=0; while [ $fail -lt 5 ]; do py.test && pass=$(( $pass + 1 )) || fail=$(( $fail + 1 )); done; echo "Fail: $fail, Passed: $pass"

Actual results:
1st run: Fail: 5, Passed: 9
2nd run: Fail: 5, Passed: 105

Expected results:
All passed

Additional info:
Comment 1 Václav Pavlín 2015-09-11 10:58:19 EDT
I ran it also on Ubuntu userspace (in a Docker container, so with the Fedora Kernel) and the results are basically the same: Fail: 7, Passed: 200
Comment 2 Petr Viktorin 2015-09-11 13:18:06 EDT
This boils down to Python not being able to start 5 threads in 1 second.
A quicker reproducer is to run several copies of the testsuite in parallel, e.g.

    seq 500 | parallel --bar --halt 2 -j20 "echo {}; py.test"
Comment 3 Nick Coghlan 2015-11-24 23:56:25 EST
Petr, I tried the original reproducer with a modified test implementation that waits for an event to be signaled, so it's only timing the threads waking up, rather than starting them in the first place: https://github.com/pydanny/cached-property/issues/24#issuecomment-138815633

That modified version still failed.

Audrey also just posted to the upstream issue noting that they're now seeing the failure when using Travis CI's containerised builders: https://github.com/pydanny/cached-property/issues/24#issuecomment-159461592
Comment 4 Fedora Admin XMLRPC Client 2016-01-29 08:05:09 EST
This package has changed ownership in the Fedora Package Database.  Reassigning to the new owner of this component.
Comment 5 Fedora End Of Life 2016-07-19 13:50:15 EDT
Fedora 22 changed to end-of-life (EOL) status on 2016-07-19. Fedora 22 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of
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