CEF freezing after upgrade

[kilo9delta]

I've upgraded my application from CEF79 to use the latest version CEF87 (87.0.4280.88). Ever since my application freezes randomly and is no longer usable.

It only seems to happen when a new browser is created.
How can I investigate that problem?

Details:
- Windows 10 x64, AMD Ryzen CPU, NVIDIA GPU
- Build from Spotify
- No sandbox
- OSR

Switches:

disable-gpu
disable-gpu-compositing
disable-gpu-vsync
off-screen-rendering-enabled
disable-gpu-shader-disk-cache = 1
autoplay-policy = no-user-gesture-required

Last messages from verbose cef log:

[1219/152047.010:VERBOSE1:dispatcher.cc(553)] Num tracked contexts: 0
[1219/152047.849:INFO:cpu_info.cc(53)] Available number of cores: 48
[1219/152047.851:VERBOSE1:script_context.cc(273)] Created context:
extension id: (none)
frame: 000001B809C822B8
URL:
context_type: WEB_PAGE
effective extension id: (none)
effective context type: WEB_PAGE
[1219/152047.852:VERBOSE1:script_context.cc(273)] Created context:
extension id: (none)
frame: 0000000000000000
URL:
context_type: UNSPECIFIED
effective extension id: (none)
effective context type: UNSPECIFIED
[1219/152047.852:VERBOSE1:dispatcher.cc(373)] Num tracked contexts: 1

Thank you!

[digory]

Does your application run out of memory? May be this bug:
https://www.magpcss.org/ceforum/viewtopic.php?f=6&t=18070&p=47687#p47687
https://bitbucket.org/chromiumembedded/cef/issues/3066/starting-cef-takes-lots-of-cpu-and

[kilo9delta]

Does your application run out of memory? May be this bug:
https://www.magpcss.org/ceforum/viewtopic.php?f=6&t=18070&p=47687#p47687
https://bitbucket.org/chromiumembedded/cef/issues/3066/starting-cef-takes-lots-of-cpu-and

Thanks for your reply. I've read through those issues but in my case there is no increased memory or CPU usage.
I still have this problem described in my post. What else could I try to figure out what is going on?

[magreenblatt]

What content are you loading? Does the problem reproduce with the cefclient sample application?

[kilo9delta]

What content are you loading? Does the problem reproduce with the cefclient sample application?

It's a pretty simple HTML page with CSS and some Javascript. But it also happens with different other HTML pages.
I've tried loading the same page with the cefclient but wasn't able to get a freeze there.

Maybe it's really up to my implementation because it didn't change much since CEF 59 (only changes to solve the breaking changes).
But I'm a bit stuck on how to debug this. Appreciate any tips or hints!
Thank you.

[magreenblatt]

How are you running the CEF message loop?

[kilo9delta]

Here's the code:
https://pastebin.com/BhZCTN6p

Using the CefDoMessageLoopWork with OnScheduleMessagePumpWork method.

[ndesktop]

I would say you are deadlocking in TickMessagePump. If the lock is acquired from OnScheduleMessagePumpWork or some other place, CefDoMessageLoopWork is locked.
I would rewrite (blindly) TickMessagePump as:

Code: Select all

void FCEFBrowserApp::TickMessagePump(float DeltaTime, bool bForce)
{
    bool should_loop = false;
    // scope the locking only to the variables and logic
    // and move CefRunMessageLoop outside locking
    {
        FScopeLock Lock(&MessagePumpCountdownCS);
 
        bool bPump = false;
        // count down in order to call message pump
        if (MessagePumpCountdown >= 0)
        {
            MessagePumpCountdown -= DeltaTime * 1000;
            if (MessagePumpCountdown <= 0)
            {
                bPump = true;
            }
        }
        if (bPump || bForce)
        {
            // -1 indicates that no countdown is currently happening
            MessagePumpCountdown = -1;
            should_loop = true;
        }
    }

    if(should_loop) {
        CefDoMessageLoopWork();
    }
}


[kilo9delta]

Did some tests and I didn't get a freeze so far. I wonder why it worked before CEF79, did CefDoMessageLoopWork not trigger OnScheduleMessagePumpWork before?

Anyway, thank you so much!