unity8 crashes when running ubuntu keyboard test

The actual trigger appears to be when maliit restarts (which the tests do to enable extra introspection), so this can be reproduced by simply running "restart maliit-server"

Shell rejecting OSK's re-connection attempts, which is wrong. It shouldn't also crash...

Seems to be crashing in the scene graph renderer?

#0 0xb68c53ec in QSGOpaqueTextureMaterial::compare (this=0x23b9b00, o=0x23bf1d8) at scenegraph/util/qsgtexturematerial.cpp:295
#1 0xb68b3566 in QSGBatchRenderer::Renderer::prepareAlphaBatches (this=this@entry=0x15b8fd8) at scenegraph/coreapi/qsgbatchrenderer.cpp:1594
#2 0xb68baac4 in QSGBatchRenderer::Renderer::render (this=0x15b8fd8) at scenegraph/coreapi/qsgbatchrenderer.cpp:2544
#3 0xb68c1560 in QSGRenderer::renderScene (this=0x15b8fd8, bindable=...) at scenegraph/coreapi/qsgrenderer.cpp:206
#4 0xb68c18e8 in QSGRenderer::renderScene (this=<optimized out>, fboId=0) at scenegraph/coreapi/qsgrenderer.cpp:168
#5 0xb68cc2b4 in QSGRenderContext::renderNextFrame (this=0x1234498, renderer=0x15b8fd8, fboId=<optimized out>) at scenegraph/qsgcontext.cpp:554
#6 0xb68feab8 in QQuickWindowPrivate::renderSceneGraph (this=this@entry=0x12351b8, size=...) at items/qquickwindow.cpp:379
#7 0xb68df738 in QSGRenderThread::syncAndRender (this=this@entry=0x14f68a0) at scenegraph/qsgthreadedrenderloop.cpp:582
#8 0xb68e0908 in QSGRenderThread::run (this=0x14f68a0) at scenegraph/qsgthreadedrenderloop.cpp:663
#9 0xb63cf496 in ?? () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5
#10 0xb6055490 in start_thread () from /lib/arm-linux-gnueabihf/libpthread.so.0
#11 0xb6216c4c in ?? () from /lib/arm-linux-gnueabihf/libc.so.6

I assigned you Daniel as I recall we had this same issue last week with the welcome wizard

@michael-sheldon

Thanks a lot for comment #4. Saved me a lot of time.

I am still seeing a crash in unity8 with the stack trace similar to what's in comment #8 here. Do we need to open a separate bug for that crash?

- Flashed my mako with r248 (using "ubuntu-device-flash touch ubuntu-system --channel ubuntu-touch/rc-proposed/ubuntu").
- Unlocked the phone and had in a ssh terminal "powerd-cli display on"
- did "sudo gdb -p $(pidof unity8)" in another ssh terminal and resumed unity8 with "cont"
- Run "phablet-test-run -v ubuntu_keyboard.tests.test_keyboard.UbuntuKeyboardTestsAccess" in another terminal, 4 times in a row.

Didn't get any crash.

Therefore I consider this bug as indeed fixed.

dobey, if you're still getting similar crashes please file a new bug with the exact steps and preconditions to reproduce the issue. It's likely a different, but similar, bug.

I've filed bug #1499388