When debugging an extension, closing the extension dev host exception-breaks with EPIPE

[itowlson]

Issue Type: Bug

I maintain a VS Code extension. Recently I have started to experience the following behaviour:

• I run the extension under the debugger and the Extension Development Host runs. I activate my extension.
• I close the Extension Development Host.
• VS Code triggers a debug break in an internal VS Code function called afterWriteDispatched. It displays an exception popup and the code location where the exception occurred. The error is write EPIPE. None of my code appears to be on the stack at this time.
• After a few seconds, the debug toolbar and exception popup disappear. The internal file remains open.

Although this seems harmless, it's a bit annoying, and it does make me anxious that there's something I'm doing wrong. This never used to happen but I'm not sure whether it started due to changes in my extension or changes in VS Code; it now happens more often than not. Other extensions I maintain do not seem to be hitting this problem so I can well believe it's an extension problem but the error message doesn't give me any clue where to look!

The operating system is Windows and the extension source code is at https://github.com/Azure/vscode-kubernetes-tools/

Here's a screenshot of the error (sorry, it doesn't stay around long enough for me to copy as text):

And a screenshot with the full file path:

VS Code version: Code 1.36.1 (2213894, 2019-07-08T22:59:35.033Z)
OS version: Windows_NT x64 10.0.18912

System Info

Item	Value
CPUs	Intel(R) Xeon(R) CPU E5-1650 v2 @ 3.50GHz (12 x 3492)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: disabled_software oop_rasterization: disabled_off protected_video_decode: unavailable_off rasterization: enabled skia_deferred_display_list: disabled_off skia_renderer: disabled_off surface_synchronization: enabled_on video_decode: enabled viz_display_compositor: disabled_off webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	63.93GB (33.24GB free)
Process Argv	--folder-uri file:///d%3A/GitHub/vscode-kubernetes-tools
Screen Reader	no
VM	0%

Extensions (14)

Extension	Author (truncated)	Version
better-toml	bun	0.3.2
gitlens	eam	9.9.1
EditorConfig	Edi	0.13.0
vscode-pull-request-github	Git	0.9.1
terraform	mau	1.3.12
vscode-docker	ms-	0.7.0
python	ms-	2019.6.24221
azure-account	ms-	0.8.4
csharp	ms-	1.21.0
Go	ms-	0.11.4
powershell	ms-	2019.5.0
vscode-typescript-tslint-plugin	ms-	1.2.2
java	red	0.47.0
vscode-yaml	red	0.4.1

[weinand]

What breakpoint settings are you using?

[itowlson]

@weinand Uncaught Exceptions is ticked. The other two are unticked.

[itowlson]

@weinand Kia ora, I see this was tagged as needs more info. What more information do you need? I'm working on webpacking my extension and this is now biting me every time, so it would be great to know if there is anything we can do about it. Thanks!

[weinand]

This problem should be fixed in recent builds.
Please try latest Insiders.