`rg` uses too much memory

Issue Type: Bug

Easy for me to reproduce:

• git clone https://github.com/babel/babel.git
• cd babel
• make bootstrap
• code-insiders .

View the system monitor, and the process rg quickly starts consuming more and more memory -- as well as 100% of my 8 cpus. If left on for more than a few seconds it will make the system unusable. (This is on Linux Mint 18.3.)

I just noticed this today after updating vscode insiders. I was editing babel yesterday with no problem, so this is probably due to a recent change. Does not reproduce with vscode non-insiders. I have no extensions installed and no custom settings.

VS Code version: Code - Insiders 1.23.0-insider (b845ce9, 2018-04-24T05:12:06.211Z)
OS version: Linux x64 4.13.0-37-generic

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz (8 x 2600)
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 rasterization: disabled_software video_decode: unavailable_software video_encode: enabled vpx_decode: unavailable_software webgl: enabled webgl2: enabled
Load (avg)	4, 4, 3
Memory (System)	7.63GB (1.57GB free)
Process Argv	/usr/share/code-insiders/code-insiders .
Screen Reader	no
VM	0%

Extensions: none

[roblourens]

No recent changes... Can you get the command line args of that process from ps?

Based on ps aux --sort=-pmem --forest:

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
andy      9902  7.0  1.4 1474528 118916 ?      Ssl  14:48   0:01 /usr/share/code-insiders/code-insiders .
andy      9956  1.4  0.8 430212 68468 ?        Sl   14:48   0:00  \_ /usr/share/code-insiders/code-insiders --type=gpu-process --no-sandbox --supports-dual-gpus=false --gpu-driver-bug-workarounds=1,7,23,61,74 --disable-gl-extensions=GL_K
andy      9910  0.0  0.3 330680 29580 ?        S    14:48   0:00  \_ /usr/share/code-insiders/code-insiders --type=zygote --no-sandbox
andy      9969 13.1  2.9 1255184 237876 ?      Sl   14:48   0:01      \_ /usr/share/code-insiders/code-insiders --type=renderer --js-flags=--nolazy --no-sandbox --primordial-pipe-token=E1124D0243E26581FCEC63DB6929C1E5 --lang=en-US --app-
andy     10024 80.5  3.0 1180160 244036 ?      Sl   14:48   0:10      |   \_ /usr/share/code-insiders/code-insiders /usr/share/code-insiders/resources/app/out/bootstrap --type=watcherService
andy     10022  6.8  0.8 997980 67684 ?        Sl   14:48   0:00      |   \_ /usr/share/code-insiders/code-insiders /usr/share/code-insiders/resources/app/out/bootstrap --type=extensionHost
andy     10052  3.0  0.8 1148816 65168 ?       Sl   14:48   0:00      |       \_ /usr/share/code-insiders/code-insiders /usr/share/code-insiders/resources/app/out/bootstrap --type=searchService
andy     10086  692 27.2 2239812 2184364 ?     Sl   14:48   1:23      |           \_ /usr/share/code-insiders/resources/app/node_modules.asar.unpacked/vscode-ripgrep/bin/rg --files --hidden --case-sensitive -g **/package.json --no-ignore
andy      9973  3.6  1.2 1076444 97308 ?       Sl   14:48   0:00      \_ /usr/share/code-insiders/code-insiders --type=renderer --js-flags=--nolazy --no-sandbox --primordial-pipe-token=855B9177D0E6A24EFAE370BB4845C82D --lang=en-US --app-

So the command is: rg --files --hidden --case-sensitive -g **/package.json --no-ignore

[roblourens]

I can't repro this exact case, it's weird that the package.json search would take so long since there's one in the root and so many others. But I do see it with other extensions. This repo has a ton of symlinks for node modules which probably don't need to be followed for search, and setting "search.useSymlinks": false fixes it.

That solution only works until I open a file -- after that rg once again begins consuming all available memory. I am finding this out the hard way and having to hard reset my computer. There is no problem using vscode non-insiders.

[roblourens]

after that rg once again begins consuming all available memory

In that case does the process have the same arguments or are they different?

[roblourens]

I can repro the original case on Linux but I don't see

That solution only works until I open a file

Is that any file or a certain type? .txt vs .js?

[roblourens]

I think we expected rg --quiet --files to terminate immediately when a file is found, but it isn't. Filed BurntSushi/ripgrep#907 @chrmarti

Of course that wouldn't help a case where there is no package.json file anyway. #34711 (comment) is relevant here. I should do that this month.

Ran with ps again and it still seems to be running rg --files --hidden --case-sensitive -g **/package.json --no-ignore. This time it reproduced without opening any files (maybe it was just delayed before). I've double-checked that I have "search.useSymlinks": false set in my user settings, though there is an Unknown configuration setting warning.

[roblourens]

Sorry, I mean "search.followSymlinks": false