1564154 - `listWorkers` throws exception on some websites

Status: RESOLVED WORKSFORME

(DevTools :: Application Panel, defect, P2)

Description

[Belén [:ladybenko]]

STR:

• Open https://serviceworke.rs/strategy-network-or-cache.html
• Open the Application panel
  Result: listWorker exception in the console
  (Alternatively, clicking on Start service worker button, will also trigger this error).

error occurred while processing 'listWorkers': [Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIServiceWorkerManager.getRegistrationByPrincipal]"  nsresult: "0x80004005 (NS_ERROR_FAILURE)"  location: "JS frame :: resource://devtools/server/actors/targets/worker.js :: _getServiceWorkerRegistrationInfo :: line 160"  data: no]

Comment 1

[Ola Gasidlo [:ogasidlo] [:ola] OOO - please ping :ladybenko:]

You might need to change 2 values in the about:config

1. devtools.application.enabled -> true
2. dom.ipc.processCount -> set to 1

Comment 2

[Ola Gasidlo [:ogasidlo] [:ola] OOO - please ping :ladybenko:]

Perry + Andrew:
After some investigation, it seems the issue appears when we have an automated updating cycle in SW, so I guess it might be related to the SW feature patch.

Johann:
Console also spit out a few Tracking Protection warnings. I'm not sure, if this is related but I feel it might be worth a look.

Thanks!

Comment 3

[Julian Descottes [:jdescottes]]

potential duplicate of https://bugzilla.mozilla.org/show_bug.cgi?id=1447197

Comment 4

[Perry Jiang [:perry] [no longer employee, use ni?]]

I haven't been able to reproduce...what OSes is this present on?

Comment 5

[Ola Gasidlo [:ogasidlo] [:ola] OOO - please ping :ladybenko:]

OS: macOS 10.14.5
Browser: Firefox Nightly recent central tip

As mentioned here: https://bugzilla.mozilla.org/show_bug.cgi?id=1447197#c2
It is not happening for every SW.

Comment 6

[Johann Hofmann [:johannh]]

Sorry for the delay. tbh I couldn't really reproduce this, but I doubt it's related to ETP. Let me know if you have any further suspicions in that direction, though.

Comment 7

[:Harald Kirschner :digitarald]

Can't reproduce anymore, please re-open if this comes back up for anybody.