1661452 - when doing webrtc call: XML Parsing Error: no root element found

Status: RESOLVED DUPLICATE of bug 1639821

(Core :: WebRTC: Audio/Video, defect)

Description

[Ralf Jung]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:81.0) Gecko/20100101 Firefox/81.0

Steps to reproduce:

I started a WebRTC call (just tried this on a Cisco video system run by my institute).

Actual results:

An unclosable window popped up in the top left corner of my screen:

XML Parsing Error: no root element found

I think this is the window that should show the WebRTC indicator, but it somehow got broken.

Comment 1

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

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Comment 2

[Francesco Lodolo [:flod]]

Could you copy and paste your browser information from about:support?

1. Open about:support
2. Copy the raw data using the button at the top
3. Create a new file in a text editor, save it, then attach it to this bug.

Also, a screenshot might help. Is there any other text in the error?

Comment 3

[Ralf Jung]

Here's the full text (sorry forgot to copy-paste last time, but turns out this reproduces on meet.jit.si):

XML Parsing Error: no root element found
Location: chrome://browser/content/webrtcLegacyIndicator.xhtml
Line Number 1, Column 1:

I can make a screenshot but it's not terribly exciting, just a box with that text floating in the top-left corner of my screen. It looks just like an XML webpage looks when there's an XML parsing error (yellow background, and a thin red line).

As for about:support:

Comment 4

[Ralf Jung]

Attachment: support-data.json

Comment 5

[Francesco Lodolo [:flod]]

OK, I thought it was an issue related to language packs (that's common for XML errors), but it doesn't look like it.

You don't have any language pack installed, it's a full en-US build, and the specific file doesn't seem to load any localized string
https://searchfox.org/mozilla-central/source/browser/base/content/webrtcLegacyIndicator.xhtml

At this point, we need to wait for someone familiar with the code. I tried to start a meeting on meet.jit.si, but I don't get any error on Nightly.

Comment 6

[Ralf Jung]

This seems to be fixed with 81.0b4.

Comment 7

[Byron Campen [:bwc]]

Is the release channel (80) affected by this? What about nightly?

Comment 8

[Ralf Jung]

Sorry, no idea. I am only using beta, and there it only started happening when updating to 81 and it stopped with the latest update.

Comment 9

[Byron Campen [:bwc]]

(In reply to Francesco Lodolo [:flod] from comment #5)

OK, I thought it was an issue related to language packs (that's common for XML errors), but it doesn't look like it.

You don't have any language pack installed, it's a full en-US build, and the specific file doesn't seem to load any localized string
https://searchfox.org/mozilla-central/source/browser/base/content/webrtcLegacyIndicator.xhtml

At this point, we need to wait for someone familiar with the code. I tried to start a meeting on meet.jit.si, but I don't get any error on Nightly.

What version did you attempt to reproduce this on?

Comment 10

[Byron Campen [:bwc]]

^

Comment 11

[Byron Campen [:bwc]]

Does this happen on a new profile?

Comment 12

[Francesco Lodolo [:flod]]

(In reply to Byron Campen [:bwc] from comment #9)

What version did you attempt to reproduce this on?

(In reply to Francesco Lodolo [:flod] from comment #5)

At this point, we need to wait for someone familiar with the code. I tried to start a meeting on meet.jit.si, but I don't get any error on Nightly.

I tried on Nightly at the time of the comment, I assume it was already 82 on Aug 27. Can you reproduce it?

Note that the user is already unable to reproduce on the existing profile, and I'm not exactly sure what could have changed during a beta cycle. Maybe some cache corruption?

Comment 13

[Paul Adenot (:padenot)]

Closing this for now, please reopen if anybody is seeing this again.