VSCode hangs with 100% CPU in Code Helper process when viewing specific file

[aeschli]

From @akoeplinger on June 23, 2017 12:8

• VSCode Version: Code 1.13.1 (379d2efb5539b09112c793d3d9a413017d736f89, 2017-06-14T18:13:05.928Z)
• OS Version: Darwin x64 16.6.0
• Extensions:

Extension	Author	Version
vscode-markdownlint	DavidAnson	0.9.1
vscode-docker	PeterJausovec	0.0.16
sort-lines	Tyriar	1.3.0
githistory	donjayamanne	0.2.0
python	donjayamanne	0.6.5
cpptools	ms-vscode	0.11.4
csharp	ms-vscode	1.10.0
mono-debug	ms-vscode	0.15.6
Ruby	rebornix	0.12.1

---

Steps to Reproduce:

1. mkdir vscodehang && cd vscodehang
2. wget https://raw.githubusercontent.com/mono/mono/c7b19b52fd671233cf2daab451f09c7591c859b1/mcs/class/Mono.Security/Mono.Xml/MiniParser.cs
3. code .
4. Open MiniParser.cs
5. VSCode gets unresponsive and offers to reopen window

Copied from original issue: Microsoft/vscode#29319

[aeschli]

From @jens1o on June 23, 2017 12:18

Can reproduce this in latest insider, even when only pasting the file contents from https://raw.githubusercontent.com/mono/mono/c7b19b52fd671233cf2daab451f09c7591c859b1/mcs/class/Mono.Security/Mono.Xml/MiniParser.cs

[aeschli]

From @isidorn on June 23, 2017 14:31

I can also repro, vscode crashes, might be a text mate grammer going inffinite. Adding important since we crash

[aeschli]

Reproduced with

private static readonly ushort[] tbl = {
		(ushort)(((ushort)CharKind.LEFT_BR << 12) | ((ushort)ActionCode.STATE_CHANGE << 8) | 1),

and adding additional

(ushort)(((ushort)CharKind.LEFT_BR << 12) | ((ushort)ActionCode.STATE_CHANGE << 8) | 1),

array items brings TextMate to a standstill.

[DustinCampbell]

@aeschli: I can reproduce this as well. Any tips on how to debug this sort of issue?

[DustinCampbell]

Note: I can reproduce it by adding array items on the same line, but not by adding them on separate lines.