puppeteer-sharp: Use Page.DisposeAsync and Browser.DisposeAsync hang forever

Before you file a bug, have you:

• Tried upgrading to newest version of PuppeteerSharp, to see if your issue has already been resolved and released? Yes, I am using the latest version.

• Checked existing open and closed issues, to see if the issue has already been reported? Yes, I do search quite a lots and also try to find solution from the original puppeteer repo also.

• Tried reproducing your problem in a new isolated project? Not yet, I might try next time but since it’s a production issue, so I need to fix it quickly.

• Considered if this is a general question and not a bug?. For general questions please use StackOverflow. Not sure but after I change to use Dispose() seems these chrome process close correctly.

Description

I am running puppeteer-sharp with docker, I found there are quite a lot of zombie chrome process never be kill. I was try to use tini as entry point (tips from here tips) also no luck. I was check the logs, I found that some DisposeAsync sometime never complete. So I change to use Dispose instead, looks good so far.

Complete minimal example reproducing the issue

There is not complete code right now, I might update later. I just simply to call DisposeAsync. E.g.

var options = new LaunchOptions
{
    Headless = Configurations.Puppeteer.Headless,
    Args = new string[]
    {
        "--no-sandbox",
        "--disable-dev-shm-usage",
        "--incognito"
    }
};
Browser = await Puppeteer.LaunchAsync(options, loggerFactory);
var browserPages = await Browser.PagesAsync();
if (browserPages.Length > 0) {
    Page = browserPages[0];
    await Task.WhenAll(browserPages.Skip(1).Select(x => x.CloseAsync()));
} else {
    Page = await Browser.NewPageAsync();
}

// some other steps 

logger.LogInformation("browser is disposing");
await Page.DisposeAsync();
await Browser.DisposeAsync();
// this log sometime never print out
logger.LogInformation("browser is disposed");

Expected behavior:

Browser dispose correctly, and no zombie process

Actual behavior:

I found some zombie process never be kill

Versions

• Which version of PuppeteerSharp are you using?

• Version: 2.0.3

• Which .NET runtime and version are you targeting? E.g. .NET framework 4.6.1 or .NET Core 2.0.

• netcoreapp3.1, aspnet core mvc

Additional Information

Running puppeteer-sharp in docker, dockerfile similar with the one you provided, I just added tini as entry-point. (BTW, I think the docker example should also add this and run with args --disable-dev-shm-usage).