WPE 2.38: OOM(Out of Memory) error with HLS and DASH playback while streaming any content with WebInspector open

[hridhya-narayanan-infosys]

We are seeing Out of memory error with HLS and DASH playback when streaming any content with webinspector open. We could see the memory max usage increases and then finally WebKitBrowser Plugin gets deactivated due to reason Memory Exceeded.

Below are the observations on Sagemcom VA device while streaming the content with webinspector open:

cat /sys/fs/cgroup/memory/memory.max_usage_in_bytes
sleep 60
done
688664576
688664576
688664576
688664576
688664576
688664576
688664576
688664576
692006912
705425408
715304960
730238976
747614208
773545984
774053888
784330752
794058752
805359616
817238016
830091264
844013568
849997824
862879744
871493632
883142656
895012864
904065024
915701760
923099136
931594240
959557632
966942720
973156352
975294464
975294464

"Monitor"data: {callsign: WebKitBrowser, action: Deactivate, reason: MemoryExceeded}
"Monitor"data: {callsign: WebKitBrowser, action: Activate, reason: Automatic}
"WebKitBrowser"data: {state: deactivated, reason: MemoryExceeded}

Scenario to reproduce:

1. Open any DASH/HLS based app and start playback.
2. Open Webinspector
3. Observe memory usage.

Below are the logs from Sagemcom VA for DASH and HLS playbacks:
Pluto TV (https://app-virginmedia360.pluto.tv/) HLS playback:
wpeframework.log

ITVX App (https://app.10ft.itv.com/3.449.2/virginmedia) DASH playback:
wpeframework.log

[pgorszkowski-igalia]

Unfortunately, I don't have access to PlutoTV and ITVX App so I cannot test them, so I focus on MVT tests. I found that in the case of Shaka tests, each test creates a new "video" element, and in theory, the existing one from the previous test is removed. Nevertheless, after adding some logs, I discovered that the "video" element from the previous test was not removed completely (probably shaka keeps some reference to it), which caused it to be kept in memory.

It works as expected in the case of "DashJS tests" and "Progressive HTML5 tests".

@hridhya-narayanan-infosys : Can you run PlutoTV or/and ITVX with WEBKIT_DEBUG=Media,MemoryPressure to gather more info (and reproduce OOM with RWI) and provide me logs?

[hridhya-narayanan-infosys]

@pgorszkowski-igalia should I need to share logs with including the downstream patch changes 39f3e68 which is shared as part of #1335 ?

[pgorszkowski-igalia]

@hridhya-narayanan-infosys : yes