RexOps/Rex

read buffer tests on FreeBSD are bailing out sporadically

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#1,327 opened on May 21, 2020

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help wanted

Description

Describe the bug

Every once in a while, read buffer tests on FreeBSD are bailing out sporadically, like in this CPAN Testers report.

See #954 also, which is similar, or it's still the same even.

These two test results seems to be generated on the same testing box (same deps, rex version, perl version, OS version, architecture, uname output, etc.):

How to reproduce it

Since it seems sporadic, I'm not exactly sure about reproduction and we would probably need help from FreeBSD users.

Steps to reproduce the behavior:

  1. run t/read_buffers.t tests (probably many times until it happens)

Shortest code example that demonstrates the bug:

$ prove -l t/read_buffers.t

or perhaps

$ perl t/read_buffers.t

Expected behavior

t/read_buffers.t test should reliably finish successfully on FreeBSD systems.

Circumstances

  • Rex version: 1.10.0 (probably older ones too)
  • Perl version: 5.30.2 (probably older ones too)
  • OS running rex: FreeBSD 13.0 (probably older ones too)
  • OS managed by rex: -

Debug log

Not a debug log, but test fails with:

Bailout called.  Further testing stopped:  Reading from buffer timed out
FAILED--Further testing stopped: Reading from buffer timed out
*** Error code 255

Contributor guide

Tech stack
None
Domain
testingbackend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
familiarity with Perl testingFreeBSD environment
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25
Research direction
Investigate the sporadic test failure in t/read buffers.t on FreeBSD. The issue reports a 'Reading from buffer timed out' bailout. Check for race conditions or timing issues, and compare with similar issue #954. Reproduction may require running the test many times on a FreeBSD system. Look at the test code and the read buffer implementation to identify potential causes of intermittent failures.