831374 - Firefox (debuggee) hangs after accepting the incoming connection for the Browser Debugger

Status: RESOLVED WORKSFORME

(DevTools :: Debugger, defect, P3)

Description

[Jared Wein [:jaws] (please needinfo? me)]

STR:
Start a new Firefox instance
Go to Web Developer -> Browser Debugger
Accept incoming connection

Expected:
Browser debugger shows list of scripts and is ready to begin working.

Actual:
Debugee (Firefox) hangs for about 30 seconds while it is, presumably, gathering the list of scripts that can be debugged.

Perhaps this generation can happen off the main-thread? I'll also run it through the Gecko Profiler to see if anything more pointed can be found.

Comment 1

[Jared Wein [:jaws] (please needinfo? me)]

This is a profile of it, and while it doesn't mark it as jank, you can see that there is a super-long running function that appears to be waiting in TA_nest() @ dbg-script-actors.js:785.

http://people.mozilla.com/~bgirard/cleopatra/#report=04315f7bd685c51104d99ded108bb923076579b6

Comment 2

[Rob Campbell [:rc] (:robcee)]

were you running an opt or debug build, Jared?

Comment 3

[Jared Wein [:jaws] (please needinfo? me)]

Opt build, this was while running a Nightly build.

Comment 4

[Panos Astithas (he/him) [:past] (please ni?)]

I believe this is now fixed with the new scripts panel. Can you retest Jared?

Comment 5

[Jared Wein [:jaws] (please needinfo? me)]

Thanks, this is much faster now! :)