image provider test fails in CI train for arm64 (Vivid only)

[Michi Henning]

The image provider test fails consistently on arm64 only, in CI train only (passes on Jenkins CI), and only on Vivid (passes on Xenial).

https://launchpadlibrarian.net/230899583/buildlog_ubuntu-vivid-arm64.thumbnailer_2.3%2B15.04.20151222-0ubuntu1_BUILDING.txt.gz

Note the "QSignalSpy: Not a valid signal: ''" messages.

8: [ RUN ] ProviderTest.thumbnail_image
8: thumbnailer-service: [00:35:35.490] Initializing
8: thumbnailer-service: [00:35:35.527] image cache: 0 entries, 0 bytes, hit rate 0.00 (0/0), avg hit run 0.00, avg miss run 0.00
8: thumbnailer-service: [00:35:35.527] thumbnail cache: 0 entries, 0 bytes, hit rate 0.00 (0/0), avg hit run 0.00, avg miss run 0.00
8: thumbnailer-service: [00:35:35.527] failure cache: 0 entries, 0 bytes, hit rate 0.00 (0/0), avg hit run 0.00, avg miss run 0.00
8: QSignalSpy: Not a valid signal: ''
8: thumbnailer-service: [00:35:35.544] "thumbnail: /«BUILDDIR»/thumbnailer-2.3+15.04.20151222/tests/media/orientation-1.jpg (128,128): 0.011494 sec (MISS)"
8: /«BUILDDIR»/thumbnailer-2.3+15.04.20151222/tests/image-providers/provider_test.cpp:84: Failure
8: Value of: spy.wait(SIGNAL_WAIT_TIME)
8: Actual: false
8: Expected: true
8: thumbnailer-service: [00:35:45.704] Exiting
8: [ FAILED ] ProviderTest.thumbnail_image (10553 ms)
8: [ RUN ] ProviderTest.thumbnail_cancel
8: thumbnailer-service: [00:35:46.041] Initializing
8: thumbnailer-service: [00:35:46.073] image cache: 0 entries, 0 bytes, hit rate 0.00 (0/0), avg hit run 0.00, avg miss run 0.00
8: thumbnailer-service: [00:35:46.073] thumbnail cache: 0 entries, 0 bytes, hit rate 0.00 (0/0), avg hit run 0.00, avg miss run 0.00
8: thumbnailer-service: [00:35:46.073] failure cache: 0 entries, 0 bytes, hit rate 0.00 (0/0), avg hit run 0.00, avg miss run 0.00
8: QSignalSpy: Not a valid signal: ''
8: thumbnailer-service: [00:35:46.086] "thumbnail: /«BUILDDIR»/thumbnailer-2.3+15.04.20151222/tests/media/orientation-1.jpg (128,128): 0.010912 sec (MISS)"
8: /«BUILDDIR»/thumbnailer-2.3+15.04.20151222/tests/image-providers/provider_test.cpp:84: Failure
8: Value of: spy.wait(SIGNAL_WAIT_TIME)
8: Actual: false
8: Expected: true
8: thumbnailer-service: [00:35:55.713] Exiting
8: [ FAILED ] ProviderTest.thumbnail_cancel (10009 ms)

[Michi Henning (michihenning)]

I worked around the problem by changing this:

QSignalSpy spy(response, &QQuickImageResponse::finished);

to that:

QSignalSpy spy(response, SIGNAL(finished()));

Seeing this happens only on arm64 on Vivid and passes everywhere else, I'd say this is a Qt problem of some kind?

[Albert Astals Cid (aacid)]

Looks like the old "using function pointers in signal/slot connections doesn't work because the linker is broken" bug we had on regular armhf and got fixed at some point

[Albert Astals Cid (aacid)]

If it's vivid only then it probable means the xenial toolchain is already fixed up?

[Michi Henning (michihenning)]

Presumably, yes. All I know is that the arm64 build works on xenial, but fails on vivid. Strangely, the function pointer syntax works for us everywhere, except in this one test.

The work-around is good enough for us for now. But, seeing the the work-around is rather non-obvious, it would be good to have this fixed in vivid+overlay. Do you know which project to re-assign the bug to for getting that to happen?

[Albert Astals Cid (aacid)]

I'd ask Matthias Klose he does gcc stuff so would be my first person to ask for more pointers

[Michi Henning (michihenning)]

Thanks for that, will do!

[Michi Henning (michihenning)]

Doko, can you comment?