Detected blocking call to open inside the event loop by integration 'brother'/snmp

[cogneato]

The problem

Errors appearing in logs for Brother integration

Logger: homeassistant.util.loop
Source: util/loop.py:90
First occurred: 5:18:41 PM (19 occurrences)
Last logged: 5:18:53 PM

Detected blocking call to open inside the event loop by integration 'brother' at homeassistant/components/brother/utils.py, line 23: snmp_engine = hlapi.SnmpEngine() (offender: /usr/local/lib/python3.12/site-packages/pysnmp/smi/builder.py, line 256: fp = open(p, mode))

Detected blocking call to open inside the event loop by integration 'brother' at homeassistant/components/brother/init.py, line 28: brother = await Brother.create( (offender: /usr/local/lib/python3.12/site-packages/pysnmp/smi/builder.py, line 256: fp = open(p, mode))

What version of Home Assistant Core has the issue?

core-2024.6.0.dev202405160217

What was the last working version of Home Assistant Core?

core-2024.5.3

What type of installation are you running?

Home Assistant OS

Integration causing the issue

Brother

Link to integration documentation on our website

https://www.home-assistant.io/integrations/brother/

Diagnostics information

config_entry-brother-637cdaeb8d12d276c566534e29537cd1.json

Example YAML snippet

No response

Anything in the logs that might be useful for us?

No response

Additional information

No noticeable issues with device or sensors itself.

[home-assistant]

Hey there @bieniu, mind taking a look at this issue as it has been labeled with an integration (brother) you are listed as a code owner for? Thanks!

Code owner commands

Code owners of brother can trigger bot actions by commenting:

• @home-assistant close Closes the issue.
• @home-assistant rename Awesome new title Renames the issue.
• @home-assistant reopen Reopen the issue.
• @home-assistant unassign brother Removes the current integration label and assignees on the issue, add the integration domain after the command.
• @home-assistant add-label needs-more-information Add a label (needs-more-information, problem in dependency, problem in custom component) to the issue.
• @home-assistant remove-label needs-more-information Remove a label (needs-more-information, problem in dependency, problem in custom component) on the issue.

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brother documentation
brother source
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[bdraco]

Looks like snmp has the same issue

[home-assistant]

Hey there @nmaggioni, mind taking a look at this issue as it has been labeled with an integration (snmp) you are listed as a code owner for? Thanks!

Code owner commands

Code owners of snmp can trigger bot actions by commenting:

• @home-assistant close Closes the issue.
• @home-assistant rename Awesome new title Renames the issue.
• @home-assistant reopen Reopen the issue.
• @home-assistant unassign snmp Removes the current integration label and assignees on the issue, add the integration domain after the command.
• @home-assistant add-label needs-more-information Add a label (needs-more-information, problem in dependency, problem in custom component) to the issue.
• @home-assistant remove-label needs-more-information Remove a label (needs-more-information, problem in dependency, problem in custom component) on the issue.

_{^{(message by CodeOwnersMention)}}

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snmp documentation
snmp source
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[bdraco]

Detected blocking call to open with args ('/usr/local/lib/python3.11/site-packages/pysnmp/smi/mibs/instances/__SNMPv2-MIB.py', 'r') in /usr/local/lib/python3.11/site-packages/pysnmp/smi/builder.py, line 256: fp = open(p, mode) inside the event loop

[bdraco]

Issue is in pysnmp-lextudio. Likely been a problem for a while, but went undetected

[cogneato]

I had downgraded to confirm this was not in 2024.5.x, and then updated again to 2024.6 dev nightly and see another error warning with snmp and cognito

Logger: homeassistant.util.loop
Source: util/loop.py:61
First occurred: 11:22:46 PM (3 occurrences)
Last logged: 11:22:58 PM

Detected blocking call to open with args ('/usr/local/lib/python3.12/site-packages/botocore/data/cognito-idp/2016-04-18/service-2.json.gz', 'rb') in /usr/local/lib/python3.12/gzip.py, line 192: fileobj = self.myfileobj = builtins.open(filename, mode or 'rb') inside the event loop

Detected blocking call to open with args ('/usr/local/lib/python3.12/site-packages/botocore/data/cognito-idp/2016-04-18/endpoint-rule-set-1.json.gz', 'rb') in /usr/local/lib/python3.12/gzip.py, line 192: fileobj = self.myfileobj = builtins.open(filename, mode or 'rb') inside the event loop

Detected blocking call to open with args ('/usr/local/lib/python3.12/site-packages/pysnmp/smi/mibs/instances/__SNMPv2-MIB.py', 'r') in /usr/local/lib/python3.12/site-packages/pysnmp/smi/builder.py, line 256: fp = open(p, mode) inside the event loop

[bdraco]

The library code hasn't changed, and the problem has existed for a long time with these libraries.

Home Assistant's ability to detect these type of problems is what is new in dev.

[pimw1]

Looks like snmp has the same issue

Might be the same as this one? #118426