[wpe-2.38] Memory leak during video playback on i.MX6DL

[vnd]

I'm trying to play 3 short videos (~2-3 seconds each) in a loop on an i.MX6DL board, running Yocto image (dunfell).

wpewebkit 2.38.3
cog 0.14.1
gstreamer 1.16.3
IMX_DEFAULT_BSP = "mainline"
wpebackend-fdo

Simple HTML page is playing 3 videos in a loop:
https://gist.github.com/vnd/88449eb6fb6d688bc6f4882f18b2736e

WPEWebProcess RssAnon memory is growing with a speed of about 0.7MiB/minute, and eventually OOM killer kicks in.

The only caveat of the above example is that for some reason every couple of playbacks 'ended' event is not fired, and so I've added a timeout for resuming playback. Not sure if it could be causing the leak, but either way there's a bug somewhere.
Note: this page is a minimal reproducible example, production UI leaks 2-3 times faster.

Apart from hopefully fixing the leak, even slowing it down could help. Also I'm genuinely curious in all relevant info, in particular what is leaking: wpewebkit, gstreamer plugins, kernel or cog?

[vnd]

Upon further testing, leak is happening upon loading videos, and not during playback itself. Since we have a bit edgy use case with very short videos (~3 seconds) being played repeatedly, it resulted in a big memory leak. Hopefully UI guys can just switch to a longer videos, then the leak will be negligible.