1934535 - Developer tools crash when trying to display a WebAssembly

Status: UNCONFIRMED

(DevTools :: Debugger, defect, P2)

Description

[David Gausmann]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:133.0) Gecko/20100101 Firefox/133.0

Steps to reproduce:

I am on a website with a WebAssembly file. I open the developer tools and click on the wasm file.
The text displays "Reload to debug this module". Then I press F5 to reload the page.

Actual results:

Firefox crashes because it consumes 100 % processor calculation (like with an infinite loop).

Expected results:

I should have been able to debug the WebAssembly.

Comment 1

[David Gausmann]

I've run a bisection and found this commit as reason:
2024-12-02T11:52:00.067000: DEBUG : Found commit message:
Bug 1900395 - [devtools] Fix keyboard navigation and outline tests r=devtools-reviewers,ochameau

Differential Revision: https://phabricator.services.mozilla.com/D224881

Comment 2

[David Gausmann]

I think this bug has something to do with syntax highlighting. In all working Firefox versions the text "Reload to debug this module." was just text without syntax higlighting. In all crashing Firefox versions the text was blue and the word "this" had a different color.

Comment 3

[David Gausmann]

Attachment: Example website with WebAssembly that causes a crash when displaying the content

Comment 4

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::JavaScript: WebAssembly' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 5

[Mayank Bansal]

(In reply to David Gausmann from comment #1)

I've run a bisection and found this commit as reason:
2024-12-02T11:52:00.067000: DEBUG : Found commit message:
Bug 1900395 - [devtools] Fix keyboard navigation and outline tests r=devtools-reviewers,ochameau

Differential Revision: https://phabricator.services.mozilla.com/D224881

Thanks for the bisection. Marking dependency.

Comment 6

[Hubert Boma Manilla (:bomsy)]

Thanks for the ping! i'll take a look!