Supervisor/supervisor

I/O operation on closed file

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#984 opened on Aug 24, 2017

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Description

Hello.

Using supervisor 3.3.3 on OS X, installed through brew.

The system seems to work 'ok'; but the error file is a torrent of errors such as these (below). Any hints appreciated.

2017-08-24 13:34:04,513 CRIT uncaptured python exception, closing channel <POutputDispatcher at 4318273408 for <Subprocess at 4316929848 with name central-worker-engine-2 in state RUNNING> (stdout)> (<type 'exceptions.ValueError'>:I/O operation on closed file [/usr/local/Cellar/supervisor/3.3.3/libexec/lib/python2.7/site-packages/supervisor/supervisord.py|runforever|227] [/usr/local/Cellar/supervisor/3.3.3/libexec/lib/python2.7/site-packages/supervisor/dispatchers.py|handle_read_event|232] [/usr/local/Cellar/supervisor/3.3.3/libexec/lib/python2.7/site-packages/supervisor/dispatchers.py|record_output|166] [/usr/local/Cellar/supervisor/3.3.3/libexec/lib/python2.7/site-packages/supervisor/dispatchers.py|_log|142] [/usr/local/Cellar/supervisor/3.3.3/libexec/lib/python2.7/site-packages/supervisor/loggers.py|info|275] [/usr/local/Cellar/supervisor/3.3.3/libexec/lib/python2.7/site-packages/supervisor/loggers.py|log|293] [/usr/local/Cellar/supervisor/3.3.3/libexec/lib/python2.7/site-packages/supervisor/loggers.py|emit|186] [/usr/local/Cellar/supervisor/3.3.3/libexec/lib/python2.7/site-packages/supervisor/loggers.py|doRollover|211])

Contributor guide

Tech stack
python
Domain
backend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
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.
clear
Prerequisites
Python basicsunderstanding of file I/O
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
Investigate the traceback in the issue: supervisord.py line 227 calls runforever, dispatchers.py line 232 handle read event, line 166 record output, line 142 log, and loggers.py line 275 info, line 293 log, line 186 emit, line 211 doRollover. The error 'I/O operation on closed file' suggests a file handle is being used after close. Look at the log rotation logic (doRollover) and ensure it handles file closure correctly. Check if the issue is reproducible with current version. Review any linked issues or comments for context.