1420795 - 3 sec GC page-freeze every 10 sec. from massive youtube leak in content process (ghost window)

Status: RESOLVED DUPLICATE of bug 1409115

(Core :: DOM: Core & HTML, defect, P2)

Description

[Jan-Ivar Bruaroey [:jib] (needinfo? me)]

Attachment: GCFreeze310.png

TL;DR: This is quite bad: a content process is using about a gigabyte of unaccounted-for memory, which GC/CC is choking on, freezing the UI for 3 seconds every 10 seconds!

How I got here:

After a family member had used my laptop and Nightly for youtube for a while, I was working on https://jsfiddle.net/jib1/2jgob190/17/show/ when I noticed its visual audio analyzer rendering was freezing for 3 seconds every 10 seconds (in process id 1560). Oddly, when I ran the same fiddle in a different tab and process (PID 7869) it was running fine without freezing.

Closing all tabs but those two, I found PID 7869 was using 260 mb, while PID 1560 was using 1.1 GB!

about:memory in PID 1560 shows lots of memory still allocated for youtube.com and youtube.be, even though I only have one window with three tabs open, and none of them youtube.

I also did an Instruments profile of PID 1560 showing 4 seconds of GC every 10 seconds like clockwork. During those 4 seconds 92.4% CPU is inside nsCycleCollector::Collect. 

See screenshot. Other logs available on request.

Comment 1

[Jan-Ivar Bruaroey [:jib] (needinfo? me)]

Attachment: aboutMemory.txt (scroll to "Web Content (pid 1560)")

Comment 2

[Ben Kelly [:bkelly, not reviewing]]

Looks like a ghost window.  Are you able to reproduce this?  Did the profile have any addons installed?

Comment 3

[Jan-Ivar Bruaroey [:jib] (needinfo? me)]

about:plugins says:
- OpenH264 Video Codec provided by Cisco Systems, Inc.
- Widevine Content Decryption Module provided by Google Inc.
- Shockwave Flash

I'm not able to repro, though I have the GC logs, and a perf trace, but they're huge.

Comment 4

[Andrew Overholt [:overholt]]

I think I was able to reproduce something similar. smaug was looking at it so I'll needinfo him.

Comment 5

[Andrew McCreight [:mccr8]]

I'm regularly seeing ghost windows on YouTube, too, and billm said he was, too. I haven't come up with any good STR yet.

Comment 6

[Olli Pettay [:smaug][[e-mail]]]

What was I looking at? Certainly not anything like this.

But I can take a look once there is some way to reproduce.
Or I guess I'll need to spend some work time to watch Steve Vai's videos :p

Comment 7

[Andrew McCreight [:mccr8]]

This might be a dupe of bug 1409115. I have one STR that creates a YouTube ghost window in a profile, and it seems to be caused by the same thing. I'll post more about it in that bug.

Comment 8

[Andrew McCreight [:mccr8]]

Are you still seeing this? I landed a fix for bug 1409115 on Nightly on 12/9 (and just landed it on beta) so it may be fixed now.

Comment 9

[Jan-Ivar Bruaroey [:jib] (needinfo? me)]

So far so good, and the timeline in bug 1409115 seems to match when this started for me. I'll reopen it if I see it again. Thanks!