1517440 - "Find in files" in debugger for string with lot of occurrences requires gigabytes of memory (leak)

Status: RESOLVED INVALID

(DevTools :: Debugger, defect)

Description

[gwarser]

Attachment: memory-report.json.gz

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0

Steps to reproduce:

- open clean firefox profile
- switch to  "Firefox Privacy Notice" tab ( https://www.mozilla.org/en-US/privacy/firefox/ )
- open dev tools (F12)
- switch to debugger tab
- ctrl+shift+f for "Find in files"
- type dot ("." without quotes)
- enter


Actual results:

Memory starts rising fast (~200MB/s), filling my 4GB ram + 4GB swap.

Dialog can appear:

>A script on this page may be busy, or it may have stopped responding. You can stop >the script now, open the script in the debugger, or let the script continue.
>
>Script: resource://devtools/shared/bas…rc/components/ProjectSearch.js:100


First happened to me on https://duckduckgo.com/?q=property&t=ffsb&ia=web with search for "fe" (without quotes) but after some time started to "behave" (needed "only" 1GB of memory) and then I also tried on other pages (for example https://duckduckgo.com) and different strings "fe", "fn", "return".


Memory report attached. Can be incomplete because it's nearly impossible to switch tabs and save.

2,561.15 MB (100.0%) -- explicit
├──2,319.83 MB (90.58%) ── heap-unclassified

Comment 1

[Sylvestre Ledru [:Sylvestre]]

Not sure the debugger is the right place ? (still better than untriaged)

Comment 2

[Jason Laster [:jlast]]

Thanks for filing. This is currently being tracked here https://github.com/devtools-html/debugger.html/issues/7629.

The Debugger UI is a bit different than other projects in that it is primarily developed in https://github.com/devtools-html/debugger.html.