Control: retitle -1 libsdl2 breaks cataclysm-dda autopkgtest in lxc: only bottom left corner appears in screenshot
On Thu, 08 Dec 2022 at 21:55:07 +0100, Paul Gevers wrote: > With a recent upload of libsdl2 the autopkgtest of cataclysm-dda fails in > testing when that autopkgtest is run with the binary packages of libsdl2 > from unstable. It passes when run with only packages from testing. In > tabular form: > > pass fail > libsdl2 from testing 2.26.0+dfsg-1 > cataclysm-dda from testing 0.F-3-8 > all others from testing from testing The test is to: * run cataclysm-tiles in the background * wait 15 seconds * focus the cataclysm-tiles window * take a screenshot * use tesseract to do OCR on the window contents * look for some specific strings in the window contents This seems to be quite flaky regardless of SDL version: while trying to reproduce the bug I've seen "New Game" OCR as "(NEWIGAME]", and "World" OCR as "Morld" or "Hor 1d". On ci.debian.net with the old SDL, it renders like this: https://people.debian.org/~smcv/bug1025775/good.png https://people.debian.org/~smcv/bug1025775/good.txt On ci.debian.net with the new SDL, it renders like this: https://people.debian.org/~smcv/bug1025775/bad.png https://people.debian.org/~smcv/bug1025775/bad.txt which seems to be the same as the bottom left 640x384 pixel region of the good rendering? I can reproduce this with a lxc container inside a bookworm VM: $ sudo autopkgtest-build-lxc debian bookworm amd64 $ apt download libsdl2-2.0-0=2.26.0+dfsg-1 $ rm -fr ~/artifacts; \ autopkgtest \ --no-built-binaries \ --shell-fail \ -o ~/artifacts \ ~/libsdl2-2.0-0_2.26.0+dfsg-1_amd64.deb \ . \ -- lxc --sudo autopkgtest-bookworm-amd64 Adapting the test script to take a screenshot of the whole screen instead of just the window, and use a white background instead of black, it looks like the game is only rendering into a small region of the screen: https://people.debian.org/~smcv/bug1025775/bad-screen.png I *cannot* reproduce this interactively in a bookworm VM with the upgraded libsdl2. I don't know why lxc is any different, but it seems that it is. When I run $ rm -fr ~/artifacts; \ mkdir ~/artifacts; \ AUTOPKGTEST_ARTIFACTS=$HOME/artifacts timeout -v 5m xvfb-run debian/tests/test-tiles in my VM, even with the upgraded SDL I get a rendering similar to good.png, good.txt above. I was also unable to reproduce this interactively in a podman container. Please see https://salsa.debian.org/smcv/cataclysm-dda-branches/-/tree/autopkgtest-misc for some adjustments to the autopkgtest that might make it easier to debug. smcv
