regex warnings in MsftLinuxPatchCore.py?

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#329 opened on Aug 24, 2025 0 comments 1 reaction 0 assignees View on GitHub

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Assessment

Difficulty: 1/5
Estimated time: Under an hour
Newbie friendliness: 55/100

Issue type: Bug
Clarity: Clearly specified
Activity status: Stale
Tech stack: python
Domain: cloud, operating-systems

Research direction

Start in MsftLinuxPatchCore.py at lines 7451, 7468, and 7476, then reproduce the issue on an Ubuntu 24.04 Azure VM while watching the extension logs. Verify that the affected regex handling no longer emits invalid escape sequence warnings during LinuxPatchExtension startup.

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Description

Describe the bug
I see the following in my journalctl logs:

Aug 22 00:36:41 sr-monitor systemd[1]: Starting MsftLinuxPatchAutoAssess.service - Microsoft Azure Linux Patch Extension - Auto Assessment...
Aug 22 00:36:41 sr-monitor bash[143561]: /var/lib/waagent/Microsoft.CPlat.Core.LinuxPatchExtension-1.6.62/MsftLinuxPatchCore.py:7451: SyntaxWarning: invalid escape sequence '\_'
Aug 22 00:36:41 sr-monitor bash[143561]:   """ Fetches pid from the error message by searching for the text 'pid' and returns the process tree with all details.
Aug 22 00:36:41 sr-monitor bash[143561]: /var/lib/waagent/Microsoft.CPlat.Core.LinuxPatchExtension-1.6.62/MsftLinuxPatchCore.py:7468: SyntaxWarning: invalid escape sequence '\d'
Aug 22 00:36:41 sr-monitor bash[143561]:   regex = re.compile(' pid \d+')
Aug 22 00:36:41 sr-monitor bash[143561]: /var/lib/waagent/Microsoft.CPlat.Core.LinuxPatchExtension-1.6.62/MsftLinuxPatchCore.py:7476: SyntaxWarning: invalid escape sequence '\d'
Aug 22 00:36:41 sr-monitor bash[143561]:   regex = re.compile('\d+')

Is this a bug?

To Reproduce
Steps to reproduce the behavior:

Create Azure Ubuntu VM
Enable LinuxPatchExtension
Watch the logs

Expected behavior
No regex warnings

Screenshots
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Desktop (please complete the following information):

OS: ubuntu
Browser N/A
Version 24_04-lts

Smartphone (please complete the following information):

Device: [e.g. iPhone6]
OS: [e.g. iOS8.1]
Browser [e.g. stock browser, safari]
Version [e.g. 22]

Additional context
Add any other context about the problem here.

Dominant language: Python
Stars: 12
Forks: 20
Avg merge: 3d 2h
Merged PRs (30d): 2

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