VS Code freezes during debug when trying to expand ciscoconfpase2 objects

Open

#1,968 opened on Sep 18, 2025 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 25/100

Issue type: Bug
Clarity: Needs clarification
Activity status: Stale
Tech stack: python, vscode
Domain: devtools

Research direction

Start by reproducing the supplied ciscoconfparse2 example in VS Code with Python 3.13.7, debugpy 2025.10.0, and the listed VS Code version, then inspect expansion of serial_objs through its children. Compare the behavior with PyCharm and isolate whether the freeze is in debugpy's variable inspection or the object's child structure; done means expanding the object no longer freezes VS Code.

Written by the indexing model from the issue text.

Description

Type: Bug

First I faced this behavior in my own code. Then I tried to run code from manual for testing.
Example code was taken from ciscoconfparse2 manual https://www.pennington.net/py/ciscoconfparse2/tutorial_parent_child.html :

conf = """
policy-map QOS_1
 class GOLD
  priority percent 10
 class SILVER
  bandwidth 30
  random-detect
 class default
!
interface Ethernet0/0
 ip address 1.1.2.1 255.255.255.0
 no cdp enable
!
interface Serial1/0
 encapsulation ppp
 ip address 1.1.1.1 255.255.255.252
!
interface Serial1/1
 encapsulation ppp
 ip address 1.1.1.5 255.255.255.252
 service-policy output QOS_1
!
interface Serial1/2
 encapsulation hdlc
 ip address 1.1.1.9 255.255.255.252
!
class-map GOLD
 match access-group 102
class-map SILVER
 match protocol tcp"""
 
config = conf.split('\n')

from ciscoconfparse2 import CiscoConfParse
parse = CiscoConfParse(config)
serial_objs = parse.find_objects("^interface Serial")
print(serial_objs)

Steps to reproduce:

Start debuging the code.
execute line serial_objs = parse.find_objects("^interface Serial")
In Variables window try to expand object serial_obj
serial_obj -> 0 -> all children -> 0
VS Code freezes
Afrer clicking red square button several times the xode execution cancelled and VS Code will unfreeze

It reproduses with all unnecessary plug-ins disabled
It reproduces in VS Code Insiders
There is no freeze in PyCharm wile expanding objects

Python 3.13.7
ciscoconfparse2==0.8.34

VS Code version: Code 1.104.1 (0f0d87fa9e96c856c5212fc86db137ac0d783365, 2025-09-17T23:36:24.973Z)
OS version: Windows_NT x64 10.0.19045
Modes:

System Info

Item	Value
CPUs	12th Gen Intel(R) Core(TM) i5-1240P (16 x 2112)
GPU Status	2d_canvas: enabled direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off trees_in_viz: disabled_off video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	undefined
Memory (System)	15.73GB (2.27GB free)
Process Argv	--crash-reporter-id 5a772a63-00ab-4152-a0e3-b65436ccc523
Screen Reader	no
VM	0%

Extensions (12)

Extension	Author (truncated)	Version
vscode-django	bat	1.15.0
python-environment-manager	don	1.2.7
python-extension-pack	don	1.7.0
vsc-python-indent	Kev	1.21.0
debugpy	ms-	2025.10.0
python	ms-	2025.14.0
vscode-pylance	ms-	2025.8.1
vscode-python-envs	ms-	1.8.0
autodocstring	njp	0.6.1
intellicode-api-usage-examples	Vis	0.2.9
vscodeintellicode	Vis	1.3.2
jinja	who	0.0.8

A/B Experiments

vsliv368:30146709
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
996jf627:31283433
pythonrdcb7:31342333
usemplatestapi:31297334
aj953862:31281341
nesew2to5:31336538
agentgpt4:31387437
nes-set-on:31351930
6abeh943:31336334
0927b901:31350571
ovs_t:31383295
0cj2b977:31352657
gaj49834:31362110
cloudbuttont:31379625
todos-1:31384886
multireplacestring:31387918
control_gpt5applypatchexclusively:31387916
3efgi100_wstrepl:31382709
trigger-command-fix:31379601
auto_model_enabled:31385282

Dominant language: Python
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Forks: 202
Avg merge: 5d 1h
Merged PRs (30d): 1

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