[Linux] Failed to setup Skia Gr context.

[ckopsa]

Following the instructions in the README for the example application briefly opens the application, but then yields the following error:

./example/out/flutter_embedder_example 
flutter: Observatory listening on http://127.0.0.1:42549/
[ERROR:flutter/shell/gpu/gpu_surface_gl.cc(73)] Failed to setup Skia Gr context.
Segmentation fault (core dumped)

Ubuntu 18.04

[stuartmorgan-g]

@chinmaygarde This is flutter/engine#6353 right? Do we need to add the resolver callback, or are you going to add fallbacks as discussed in the other bug?

[chinmaygarde]

I am going to add the fallback for OpenGL proc accessors. Though, it is a good idea for embedders to be explicit about the same. I'll submit a patch to both.

Sorry about the delay, I thought flutter/engine#6353 was already reverted while I was on vacation.

[chinmaygarde]

This has been patched in the engine (flutter/engine#6523). No changes should necessary for embedders once the updates are pulled in.

[stuartmorgan-g]

Awesome, thanks!

[malkia]

This is still broken for me.

[malkia]

`malkia@penguin:~/p/flutter/bin$ ./flutter doctor -v
[✓] Flutter (Channel master, v0.10.3-pre.123, on Linux, locale en_US.UTF-8)
• Flutter version 0.10.3-pre.123 at /home/malkia/p/flutter
• Framework revision 028087d0fc (49 minutes ago), 2018-11-06 22:44:01 -0800
• Engine revision 4f4c470d24
• Dart version 2.1.0 (build 2.1.0-dev.8.0 bf26f760b1)

[✗] Android toolchain - develop for Android devices
✗ Unable to locate Android SDK.
Install Android Studio from: https://developer.android.com/studio/index.html
On first launch it will assist you in installing the Android SDK components.
(or visit https://flutter.io/setup/#android-setup for detailed instructions).
If Android SDK has been installed to a custom location, set $ANDROID_HOME to that location.
You may also want to add it to your PATH environment variable.

[!] Android Studio (not installed)
• Android Studio not found; download from https://developer.android.com/studio/index.html
(or visit https://flutter.io/setup/#android-setup for detailed instructions).

[!] VS Code (version 1.28.2)
• VS Code at /usr/share/code
• Flutter extension not installed; install from
https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[!] Connected device
! No devices available

! Doctor found issues in 4 categories.`

[malkia]

malkia@penguin:~/p/flutter-desktop-embedding/example/linux$ ./out/flutter_embedder_example
flutter: Observatory listening on http://127.0.0.1:45017/
[ERROR:flutter/shell/gpu/gpu_surface_gl.cc(81)] Failed to setup Skia Gr context.
Segmentation fault

[malkia]

malkia@penguin:~/p/flutter-desktop-embedding/example/linux/out$ ldd ./flutter_embedder_example
linux-vdso.so.1 (0x00007ffcba9b1000)
libglfw.so.3 => /usr/lib/x86_64-linux-gnu/libglfw.so.3 (0x00007b451ac0f000)
libjsoncpp.so.1 => /usr/lib/x86_64-linux-gnu/libjsoncpp.so.1 (0x00007b451a9db000)
libflutter_embedder.so => /home/malkia/p/flutter-desktop-embedding/example/linux/out/./lib/libflutter_embedder.so (0x00007b451a790000)
libflutter_engine.so => /home/malkia/p/flutter-desktop-embedding/example/linux/out/./lib/libflutter_engine.so (0x00007b4519216000)
libflutter_embedder_color_panel.so => /home/malkia/p/flutter-desktop-embedding/example/linux/out/./lib/libflutter_embedder_color_panel.so (0x00007b451900e000)
libflutter_embedder_file_chooser.so => /home/malkia/p/flutter-desktop-embedding/example/linux/out/./lib/libflutter_embedder_file_chooser.so (0x00007b4518e02000)
libflutter_embedder_menubar.so => /home/malkia/p/flutter-desktop-embedding/example/linux/out/./lib/libflutter_embedder_menubar.so (0x00007b4518bf8000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007b4518876000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007b4518572000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007b451835b000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007b4517fbc000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007b4517db4000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007b4517bb0000)
libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007b4517870000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007b4517653000)
libXrandr.so.2 => /usr/lib/x86_64-linux-gnu/libXrandr.so.2 (0x00007b4517448000)
libXinerama.so.1 => /usr/lib/x86_64-linux-gnu/libXinerama.so.1 (0x00007b4517245000)
libXxf86vm.so.1 => /usr/lib/x86_64-linux-gnu/libXxf86vm.so.1 (0x00007b451703f000)
libXcursor.so.1 => /usr/lib/x86_64-linux-gnu/libXcursor.so.1 (0x00007b4516e34000)
libgtk-3.so.0 => /usr/lib/x86_64-linux-gnu/libgtk-3.so.0 (0x00007b451651e000)
libgdk-3.so.0 => /usr/lib/x86_64-linux-gnu/libgdk-3.so.0 (0x00007b4516227000)
libpangocairo-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libpangocairo-1.0.so.0 (0x00007b451601a000)
libpango-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libpango-1.0.so.0 (0x00007b4515dce000)
libatk-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libatk-1.0.so.0 (0x00007b4515ba8000)
libcairo-gobject.so.2 => /usr/lib/x86_64-linux-gnu/libcairo-gobject.so.2 (0x00007b451599f000)
libcairo.so.2 => /usr/lib/x86_64-linux-gnu/libcairo.so.2 (0x00007b451568b000)
libgdk_pixbuf-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgdk_pixbuf-2.0.so.0 (0x00007b4515467000)
libgio-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0 (0x00007b45150d1000)
libgobject-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 (0x00007b4514e7e000)
libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007b4514b6a000)
libepoxy.so.0 => /usr/lib/x86_64-linux-gnu/libepoxy.so.0 (0x00007b4514874000)
libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007b4514602000)
/lib64/ld-linux-x86-64.so.2 (0x00007b451b035000)
libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007b45143da000)
libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007b45141c8000)
libXrender.so.1 => /usr/lib/x86_64-linux-gnu/libXrender.so.1 (0x00007b4513fbe000)
libXfixes.so.3 => /usr/lib/x86_64-linux-gnu/libXfixes.so.3 (0x00007b4513db8000)
libgmodule-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgmodule-2.0.so.0 (0x00007b4513bb4000)
libXi.so.6 => /usr/lib/x86_64-linux-gnu/libXi.so.6 (0x00007b45139a4000)
libXcomposite.so.1 => /usr/lib/x86_64-linux-gnu/libXcomposite.so.1 (0x00007b45137a1000)
libXdamage.so.1 => /usr/lib/x86_64-linux-gnu/libXdamage.so.1 (0x00007b451359e000)
libatk-bridge-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libatk-bridge-2.0.so.0 (0x00007b451336f000)
libxkbcommon.so.0 => /usr/lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007b451312f000)
libwayland-cursor.so.0 => /usr/lib/x86_64-linux-gnu/libwayland-cursor.so.0 (0x00007b4512f27000)
libwayland-egl.so.1 => /usr/lib/x86_64-linux-gnu/libwayland-egl.so.1 (0x00007b4512d25000)
libwayland-client.so.0 => /usr/lib/x86_64-linux-gnu/libwayland-client.so.0 (0x00007b4512b16000)
libpangoft2-1.0.so.0 => /usr/lib/x86_64-linux-gnu/libpangoft2-1.0.so.0 (0x00007b4512900000)
libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007b45126c2000)
libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007b4512413000)
libgthread-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007b4512211000)
libthai.so.0 => /usr/lib/x86_64-linux-gnu/libthai.so.0 (0x00007b4512007000)
libpixman-1.so.0 => /usr/lib/x86_64-linux-gnu/libpixman-1.so.0 (0x00007b4511d60000)
libpng16.so.16 => /usr/lib/x86_64-linux-gnu/libpng16.so.16 (0x00007b4511b2d000)
libxcb-shm.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007b4511929000)
libxcb-render.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007b451171b000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007b4511501000)
libselinux.so.1 => /lib/x86_64-linux-gnu/libselinux.so.1 (0x00007b45112d9000)
libresolv.so.2 => /lib/x86_64-linux-gnu/libresolv.so.2 (0x00007b45110c2000)
libmount.so.1 => /lib/x86_64-linux-gnu/libmount.so.1 (0x00007b4510e74000)
libffi.so.6 => /usr/lib/x86_64-linux-gnu/libffi.so.6 (0x00007b4510c6b000)
libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007b45109f8000)
libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007b45107ce000)
libxcb-dri3.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-dri3.so.0 (0x00007b45105cb000)
libxcb-present.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-present.so.0 (0x00007b45103c8000)
libxcb-sync.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007b45101c1000)
libxshmfence.so.1 => /usr/lib/x86_64-linux-gnu/libxshmfence.so.1 (0x00007b450ffbf000)
libglapi.so.0 => /usr/lib/x86_64-linux-gnu/libglapi.so.0 (0x00007b450fd90000)
libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007b450fb8e000)
libxcb-glx.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-glx.so.0 (0x00007b450f973000)
libxcb-dri2.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-dri2.so.0 (0x00007b450f76e000)
libdrm.so.2 => /usr/lib/x86_64-linux-gnu/libdrm.so.2 (0x00007b450f55e000)
libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007b450f35a000)
libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007b450f154000)
libatspi.so.0 => /usr/lib/x86_64-linux-gnu/libatspi.so.0 (0x00007b450ef23000)
libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007b450ecd3000)
libharfbuzz.so.0 => /usr/lib/x86_64-linux-gnu/libharfbuzz.so.0 (0x00007b450ea3e000)
libdatrie.so.1 => /usr/lib/x86_64-linux-gnu/libdatrie.so.1 (0x00007b450e836000)
libblkid.so.1 => /lib/x86_64-linux-gnu/libblkid.so.1 (0x00007b450e5f0000)
libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007b450e3da000)
libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007b451b198000)
libgraphite2.so.3 => /usr/lib/x86_64-linux-gnu/libgraphite2.so.3 (0x00007b450e1ad000)
libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007b450dfa8000)
liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007b450dd82000)
liblz4.so.1 => /usr/lib/x86_64-linux-gnu/liblz4.so.1 (0x00007b450db70000)
libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007b450d860000)
libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007b450d64c000)

[ckopsa]

I had found that I needed to go into some of the scripts and specify the correct commit hash in order for it to pull in the changes mentioned above. I can check my local repository and see what those changes were once I get to my computer.

[ckopsa]

Here is the diff of the file I had to change to make things work:

modified   linux/library/Makefile
@@ -46,7 +46,7 @@ $(LIBRARY_OUT): $(SOURCES) $(HEADERS) $(LIBRARIES)
 # already has, and makes things slightly more fragile, in exchange for
 # avoiding unnecessary relinks.
 $(FLUTTER_ENGINE_LIB_FILE): $(FLUTTER_DIR)/bin/internal/engine.version
-	$(ENGINE_UPDATER) --flutter_root=$(FLUTTER_DIR) ./
+	$(ENGINE_UPDATER) --hash=1242f6dfe11f8c16d083265e1afd50886a383ec2 ./
 	if [ -f $(FLUTTER_ENGINE_HEADER) ]; then \
 		mv $(FLUTTER_ENGINE_HEADER) include/; \
 		fi

[stuartmorgan-g]

I had found that I needed to go into some of the scripts and specify the correct commit hash

In general, forcing a specific engine version is a bad idea. There can be dependencies between the Flutter tree version and the engine version, which is why there's an auto-roller in Flutter that tests the engine before pulling in a new version. You may have arbitrary problems when using an untested combination.

Except in rare cases where you really know what you are doing, the right way to pick up an engine change is to roll your Flutter tree forward to a version whose engine pin has advanced beyond the engine commit you want.

(In this case, your hard-coded version is nearly a month behind the version of the engine that @malkia should be using with that Flutter tree, so forcing that version would likely regress something.)

• Framework revision 028087d0fc (49 minutes ago), 2018-11-06 22:44:01 -0800
• Engine revision 4f4c470d24

That should definitely have the fix. @malkia, could you check your library/linux/.last_engine_version file to see that it is in fact showing that engine hash?

[ckopsa]

I completely understand, I was just offering a work around that fixed it for me. Thanks for sharing the proper steps to diagnose/solve the issue.

[malkia]

@stuartmorgan - I have this:

malkia@penguin:~/p/flutter-desktop-embedding$ find . | grep last_engine
./library/linux/.last_engine_version

malkia@penguin:~/p/flutter-desktop-embedding$ cat ./library/linux/.last_engine_version 
4f4c470d2419abed2cac6b02761e207d9b2aa920

[stuartmorgan-g]

That means you do have the correct engine version (unless something went wrong with the update step such that the library didn't get updated, but the version stamp did). I've updated my Linux machine to your exact Flutter version though, and it's working for me.

Have you ever had it working on this machine? If not, perhaps your issue isn't related to the resolver change even though the failure mode is the same. (If so, the only other thing I can think to try is a completely clean build in case something is stale and not getting rebuilt.)