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flutter_linux_webview Validation Report

  • flutter_linux_webview version: 0.1.0
  • Validated on 2023-12-13

Validation Apps

  • example/lib/multiple_webviews_example.dart
    • A simple demo app that allows us to "Add a new WebView" or "Remove a WebView" to/from the ListView by pressing the buttons.
    • The validation procedure:
      • Repeat the process of "Adding about 10 times then Removing about 10 times" about 10 times.
  • example/integration_test/flutter_linux_webview_test.dart
    • The integration test brought from webview_flutter v3.0.4.
    • During the test, more than 10 WebViews repeatedly start and disappear in a few seconds.

Flutter versions used for the validation

Using Flutter Linux stable channel.

  • Flutter 3.10.0 [release date: 2023-05-11]
  • Flutter 3.13.9 [release date: 2023-10-26]
  • Flutter 3.16.3 [release date: 2023-12-07] (stable as of 2023-12-13)

Target Platforms

  • (1) [laptop] Macbook Air 2014 x86_64 / Ubuntu 22.04 Desktop
  • (2) [laptop] NEC LE150/N (2013) x86_64 / Debian 11 (bullseye)
  • (3) [Desktop PC] Ryzen9 5900X + GeForce GTX 1650 x86_64 / Ubuntu 18.04 Chrome Remote Desktop
  • (4) [Desktop PC] Ryzen9 5900X + Radeon RX 7800 XT x86_64 / Ubuntu 22.04 Desktop
  • (5) Raspberry Pi 4 Model B arm64 / Raspberry Pi OS bullseye 64bit
  • (6) Raspberry Pi 4 Model B arm64 / Ubuntu 22.04 Desktop

Results

(1) [laptop] Macbook Air 2014 x86_64 / Ubuntu 22.04 Desktop

Flutter 3.10.0 [2023-05-11] Flutter 3.13.9 [2023-10-26] Flutter 3.16.3 [2023-12-07]
X11 lib/multiple_webviews_example.dart It works. No errors. It works. No errors. It works. No errors.
X11 integration_test/flutter_linux_webview_test.dart Test completes to the end. Test completes to the end. Test hangs on the first item.
Wayland lib/multiple_webviews_example.dart It works. No errors. It works. No errors. It works. No errors.
Wayland integration_test/flutter_linux_webview_test.dart Test completes to the end. Test sometimes crashes in the middle? Test hangs on the first item.

(2) [laptop] NEC LE150/N (2013) x86_64 / Debian 11 (bullseye)

Almost same results as above (1) Macbook Air Ubuntu 22.04 Desktop.

(3) [Desktop PC] Ryzen9 5900X + GeForce GTX 1650 x86_64 / Ubuntu 18.04 Chrome Remote Desktop

Same results for X11 as above (1) Macbook Air Ubuntu 22.04 Desktop. (Not trying with Wayland.)

(4) [Desktop PC] Ryzen9 5900X + Radeon RX 7800 XT x86_64 / Ubuntu 22.04 Desktop

Flutter 3.10.0 Flutter 3.13.9 Flutter 3.16.3
X11 lib/multiple_webviews_example.dart It works, but crashes about once every few dozen times when "Add a new webview" is pressed. (the crash message below) It works, but crashes about once every few dozen times when "Add a new webview" is pressed. (the crash message below) It works, but crashes about once every few dozen times when "Add a new webview" is pressed. (the crash message below)
X11 integration_test/flutter_linux_webview_test.dart Test crashes in the middle. Test crashes in the middle. Test hangs on the first item.
Wayland lib/multiple_webviews_example.dart It works. No errors. It works. No errors. It works. No errors.
Wayland integration_test/flutter_linux_webview_test.dart Test crashes in the middle. Test crashes in the middle. Test hangs on the first item.

Crash message: X Window System BadAccess (attempt to access private resource denied)

(flutter_linux_webview_example:7404): Gdk-ERROR **: 19:05:33.186: The program 'flutter_linux_webview_example' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadAccess (attempt to access private resource denied)'.
  (Details: serial 16332 error_code 10 request_code 152 (GLX) minor_code 26)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the GDK_SYNCHRONIZE environment
   variable to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)

(5) Raspberry Pi 4 Model B arm64 / Raspberry Pi OS bullseye 64bit

Flutter 3.10.0 Flutter 3.13.9 Flutter 3.16.3
X11 lib/multiple_webviews_example.dart It works. No errors. Pressing "Add a new WebView" causes the app to hang (force termination required). But sometimes it does not hang at all. (*) Pressing "Add a new WebView" causes the app to hang (force termination required). But sometimes it does not hang at all.
X11 integration_test/flutter_linux_webview_test.dart Test completes to the end. Test completes to the end. Test hangs on the first item.

(*) In Flutter 3.13.9, on rare occasions, I have seen crashes with the following errors instead of hangs.

[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
flutter_linux_webview_example: ../../src/xcb_io.c:269: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.
[0100/000000.502783:ERROR:zygote_linux.cc(607)] Zygote could not fork: process_type renderer numfds 4 child_pid -1
[0100/000000.503420:ERROR:zygote_linux.cc(639)] write: Broken pipe (32)

(6) Raspberry Pi 4 Model B arm64 / Ubuntu 22.04 Desktop

Flutter 3.10.0 Flutter 3.13.9 Flutter 3.16.3
X11 lib/multiple_webviews_example.dart It works. No errors. It works. No errors. It works. No errors.
X11 integration_test/flutter_linux_webview_test.dart Test completes to the end. Test completes to the end. Test hangs on the first item.
Wayland lib/multiple_webviews_example.dart No hang, but only black texture is displayed. (*) No hang, but only black texture is displayed. (*) No hang, but only black texture is displayed. (*)
Wayland integration_test/flutter_linux_webview_test.dart Test crashes in the middle. Test crashes in the middle. Test hangs on the first item.

(*) On RPi4 Ubuntu 22.04 Wayland, any Flutter app will not work without GDK_GL=gles.
(ref. Flutter app can't create a GL context on RPi 4/Ubuntu Core 20 - Issue #49 - MirServer/ubuntu-frame - GitHub)
However, with GDK_GL=gles, off-screen rendering does not work. The texture is not rendered and we get a black WebView.
$ GDK_GL=gles cefclient --off-screen-rendering-enabled also results in a white screen.