1773944 - Memory increase in backgrounded (paused) twitch.tv tab

Status: RESOLVED INCOMPLETE

(Firefox :: Untriaged, defect)

Description

[matthias koplenig [:metasieben]]

Attachment: memory-report.json.gz

While trying to recreate bug 1772806, I saved a memory report of the browser with the twitch tab using more than 1GB.

The tab was in the background and stopped, the computer(Mac mini M1, 8GB) was locked.

Here a profile created in about:processes: https://share.firefox.dev/3HkgvRD

Comment 1

[Steve Fink [:sfink] [:s:]]

Wow, I've never seen so much storage for WeakMaps.

webIsolated=https://twitch.tv (pid 61798)
Explicit Allocations

1,300.09 MB (100.0%) -- explicit
├──1,034.13 MB (79.54%) -- window-objects/top(https://www.twitch.tv/videos/1486195733, id=288)
│  ├────932.67 MB (71.74%) -- active/window(https://www.twitch.tv/videos/1486195733)
│  │    ├──890.98 MB (68.53%) -- js-realm(https://www.twitch.tv/videos/1486195733)
│  │    │  ├──877.23 MB (67.47%) -- classes
│  │    │  │  ├──302.32 MB (23.25%) -- class(Object)/objects
│  │    │  │  │  ├──218.31 MB (16.79%) ── gc-heap
│  │    │  │  │  └───84.01 MB (06.46%) -- malloc-heap
│  │    │  │  │      ├──83.95 MB (06.46%) ── slots
│  │    │  │  │      └───0.06 MB (00.00%) ── elements/normal
│  │    │  │  ├──159.96 MB (12.30%) -- class(Set)/objects
│  │    │  │  │  ├──125.65 MB (09.66%) ── malloc-heap/misc
│  │    │  │  │  └───34.31 MB (02.64%) ── gc-heap
│  │    │  │  ├──123.52 MB (09.50%) -- class(WeakMap)/objects
│  │    │  │  │  ├──119.46 MB (09.19%) ── malloc-heap/misc
│  │    │  │  │  └────4.06 MB (00.31%) ── gc-heap
│  │    │  │  ├──105.75 MB (08.13%) -- class(Map)/objects
│  │    │  │  │  ├───86.96 MB (06.69%) ── malloc-heap/misc
│  │    │  │  │  └───18.79 MB (01.45%) ── gc-heap

I suspect the page is leaking, for some definition of "leaking". Would you happen to know if it exhibits similar behavior on another browser?

It looks like we have a whole meta bug on problems with Twitch on Firefox vs. Chrome. I don't know whether this bug should be on that list or not.

Comment 2

[BugBot [:suhaib / :marco]]

The severity field is not set for this bug.
:glandium, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 3

[Mike Hommey [:glandium]]

I'll assume this has disappeared in the past two years, but if it hasn't please feel free to reopen with an up-to-date report.