vscode hangs by hitting <tab> in the editor (easily reproducible)

[pavlos256]

• VSCode Version: 1.2.1
• OS Version: Arch Linux

Steps to Reproduce:

1. Save the following as a .css file:

.test {
white-space: pre-line;"
}

1. Open the file in vscode.
2. Place the cursor at the beginning of the second line (before white-space).
3. Hit tab.

The editor hangs with 100% CPU on a core, needs kill -9 to die.

I am able to reproduce this every time without failure.

[rebornix]

Reproduce on Mac with 1.3.0-Insider.

[dbaeumer]

@aeschli FYI.

[alexdima]

This is not a regression. Also happens in VS Code 1.2.1. Looks like emmet gets stuck in:

C:\Alex\src\vscode\node_modules\emmet\lib\parser\css.js:186 - function eatString()

Here are the locals I'm seeing in there, looks like that while loop never finishes:

[alexdima]

We use [email protected]. Just checked and [email protected] also loops in there indefinitely.

[miparnisari]

I can reproduce this as well using VS Code 1.5.2 on Windows 10. After 15 seconds I get the "The window is no longer responding" popup.

[neculaiandrei]

@miparnisari Same here.

[alexdima]

@miparnisari @neculaiandrei It is an issue with emmet -> emmetio/emmet#453

[pavlos256]

If you don't use emmet, a workaround is to disable tab expansion with:

"emmet.triggerExpansionOnTab": false

[gianpaj]

OMG @pavlos256 !! you're a life saver!!

I had trouble with a file.scss.liquid file without any VSCode extensions enabled and manually setting the file language to sass. (Mac OSX 10.11.6 - VSCode 1.8.1)

It took days to find this workaround! No stacktrace, just hangs... No idea if there's a way to enable debugging to better find the root cause of this

[ramya-rao-a]

Fixed with #19655
The upstream emmet library has been fixed.
The fix will be available in the 1.10 insiders from tomorrow.