CefSharp.MinimalExample open a scond windows by click on a link with target="_blank" .. and the application will hang on close

[stephanema1]

Is there an existing issue for this?

• I have searched both open/closed issues, no issue already exists.

CefSharp Version

112.3.0

Operating System

Windows 10

Architecture

x64

.Net Version

4.5.2

Implementation

WinForms

Reproduction Steps

1. Start the CefSharp.MinimalExample.Wpf application.

2. Navigate to a website containing a link like:
   <a href="https://raw.githubusercontent.com/stephanema1/playground/main/test.pdf" target="_blank"> test.pdf</a>

3. Now a second window opens showing the pdf.

4. close the main window (the first one)

5. the window showing the pdf gets black and never closes, you have to kill the process by the task manager.

PS:
I wanted to prepare such a testpage in my https://github.com/stephanema1/playground
but github replaces my target="_blank" :-(

Or download https://github.com/stephanema1/playground/blob/main/test.html open it with CefSharp.MinimalExample.Wpf
and do the steps above.

Expected behavior

The application should close normally without dangling freezed windows.

Actual behavior

See the Reproduction Steps number 5.

Just tried the same test with the cefclient.exe downloaded from
https://cef-builds.spotifycdn.com/cef_binary_111.2.7%2Bgebf5d6a%2Bchromium-111.0.5563.148_windows64_client.tar.bz2

cefclient.exe --multi-threaded-message-loop --no-sandbox --off-screen-rendering-enabled --enable-gpu

this one is different: it crashes when I klick on the link to open the pdf

Regression?

No response

Known Workarounds

No response

Does this problem also occur in the CEF Sample Application

Yes using WPF/OffScreen command line args

Other information

I am looking the whole das on google stackoverflow and did not find a solution

[amaitland]

If you can reproduce the problem with cefclient then please report the issue on CEF Issue Tracker (Make sure you search before opening an issue). If you open an issue here it will most likely be closed as upstream as the bug needs to be fixed in CEF.

Converted to discussion as this appears to be an upstream issue.

Does your PDF load in Chrome?

If it works in Chrome, then I'd suggest testing with the latest cefclient beta version: https://cef-builds.spotifycdn.com/cef_binary_113.1.1%2Bgfef20aa%2Bchromium-113.0.5672.63_windows64_beta_client.tar.bz2

Try testing with both options below:

cefclient.exe --multi-threaded-message-loop --no-sandbox --off-screen-rendering-enabled --enable-gpu
cefclient.exe --multi-threaded-message-loop --no-sandbox --off-screen-rendering-enabled --enable-gpu --use-default-popup

If either of options has an issue then you need to open an issue at https://github.com/chromiumembedded/cef/issues

[stephanema1]

Hi, I just downloaded the beta version from above and installed it.

Now I run:

1. cefclient.exe --multi-threaded-message-loop --no-sandbox --off-screen-rendering-enabled --enable-gpu
   go to
   my intranet website, klick on the link to open the pdf -> it crashes

2. cefclient.exe --multi-threaded-message-loop --no-sandbox --off-screen-rendering-enabled --enable-gpu --use-default-popup
   do the same as in 1. and it crashes

3. Now I run only cefclient.exe without parameters i klick on the
   link to open the pdf, and a second windows opens showing the pdf.
   Now I close by click on the x top right the main (first) window of cefclient.exe,
   the pdf windows is still shown and does not close.
   Now I click the x top right to close the pdf windows and it closes normally
   (in the windows task manager it takes 5 secs until the process dissapears)

So the funny thing here is:

1. it works without the proposed parameters
2. compared to chrome browser there is one difference:
   When I click in chrome the link to open the pdf I get a second
   window showing the pdf like cefclient.exe but
   when I close the chroma main window the window showing the
   pdf is closed too and the chrome process is terminated.
   (this is the behaviour which I would like to have in my app too)

[stephanema1]

This is the content of the debug.log when running 1. from above after the crash:

[0503/102850.002:WARNING:chrome_browser_cloud_management_controller.cc(87)] Could not create policy manager as CBCM is not enabled.
[0503/102850.479:INFO:CONSOLE(0)] "Error with Permissions-Policy header: Origin trial controlled feature not enabled: 'unload'.", source:  (0)
[0503/102850.549:INFO:CONSOLE(85)] "Autofocus processing was blocked because a document already has a focused element.", source: https://www.google.com/ (85)
[0503/103016.954:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.
[0503/103016.956:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.
[0503/103016.958:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.
[0503/103016.959:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.
[0503/103016.961:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.
[0503/103016.962:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.
[0503/103016.964:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.
[0503/103016.965:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.
[0503/103016.967:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.
[0503/103016.967:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.
[0503/103022.795:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.
[0503/103022.797:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.
[0503/103022.798:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.
[0503/103022.799:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.
[0503/103022.801:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.
[0503/103022.802:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.
[0503/103022.802:ERROR:shared_image_manager.cc(217)] SharedImageManager::ProduceSkia: Trying to Produce a Skia representation from a non-existent mailbox.

[stephanema1]

OK its me again, I did a new test with leaving out one parameter and
cefclient.exe --multi-threaded-message-loop --no-sandbox --enable-gpu --use-default-popup
does open the pdf in a second window without crash.

So far OK, but if I now close the mainwindow while the second windows showing the pdf is still open,
the main windows closes and the windows showing the pdf gets black (so I dont see the pdf) and the "black"
window remains and I have to kill the process in the task manager.

[stephanema1]

And again me, now I did a test by calling
cefclient.exe --no-sandbox --enable-gpu --use-default-popup
like in the comment above but without the --multi-threaded-message-loop parameter.

Now I can click on the pdf link to open the secondary window to show the pdf,
and if I now close the mainwindow, both windows are closed : the mainwindow and the pdf viewer window
and the process dissapears in the task manager.

So it seems to be --multi-threaded-message-loop which causes the problem

[amaitland]

f either of options has an issue then you need to open an issue at https://github.com/chromiumembedded/cef/issues

Have you raised an issue? If yes please link it back here for reference.

Issue will need to be fixed in CEF.

So it seems to be --multi-threaded-message-loop which causes the problem

https://github.com/cefsharp/CefSharp/wiki/General-Usage#multithreadedmessageloop

[stephanema1]

Created issue #4499 for this

[amaitland]

If either of options has an issue then you need to open an issue at https://github.com/chromiumembedded/cef/issues

You need to create an upstream issue.

[amaitland]

chromiumembedded/cef#3499