Since webkitgtk 2.41.6 landed in Fedora Rawhide, the Fedora openQA tests which test that viewing Help pages work are all failing (this includes tests of the installer's Help pages, and tests of various applications that include testing that their Help pages work). In all cases, we see the Yelp application open, but there is no content displayed, just a blank grey rectangle. openQA tests in (qemu) virtual machines. I can reproduce this problem manually in a local virtual machine - just grab a recent Fedora nightly image, e.g. https://kojipkgs.fedoraproject.org/compose/rawhide/Fedora-Rawhide-20230718.n.0/compose/Workstation/x86_64/iso/Fedora-Workstation-Live-x86_64-Rawhide-20230718.n.0.iso , and try running Yelp. I *cannot* reproduce this issue on my bare metal system, so it's most likely to do with the 3D graphics stack, I guess. Some info requested by mcatanzaro: 1. Running with WEBKIT_DISABLE_COMPOSITING_MODE=1 does indeed work around the issue. 2. Running `WEBKIT_DISABLE_COMPOSITING_MODE=1 epiphany` and browsing to `webkit://gpu` then hitting 'Copy to clipboard' gives me the following: { "Version Information": { "WebKit version": "WebKitGTK 2.41.6 (tarball)", "Operating system": "Linux 6.5.0-0.rc1.20230711git3f01e9fed845.12.fc39.x86_64 #1 SMP PREEMPT_DYNAMIC Wed Jul 12 14:03:10 UTC 2023 x86_64", "Desktop": "GNOME", "Cairo version": "1.17.8 (build) 1.17.8 (runtime)", "GStreamer version": "1.22.4 (build) GStreamer 1.22.4 (runtime)", "GTK version": "4.11.4 (build) 4.11.4 (runtime)" }, "Display Information": { "Type": "Wayland", "Screen geometry": "0,0 1280x800", "Screen work area": "0,0 1280x800", "Depth": "24", "Bits per color component": "8", "DPI": "96" }, "Hardware Acceleration Information": { "Policy": "never", "WebGL enabled": "Yes" } } Without WEBKIT_DISABLE_COMPOSITING_MODE=1 I can't see anything in the Epiphany window (i.e. it suffers from the same bug).
Same on ssh forwarded X11
Oh, sorry, forgot one more thing: when running yelp or epiphany - with or without WEBKIT_DISABLE_COMPOSITING_MODE=1 - on an affected system, these messages are printed to the console: libEGL warning: failed to get driver name for fd 0 libEGL warning: MESA-LOADER: failed to retrieve device information libEGL warning: failed to get driver name for fd 0 libEGL warning: egl: failed to create dri2 screen these messages don't appear when running on a non-affected system (i.e. bare metal).
Um, I know what I'm about to request is a little difficult, but we need to see the webkit://gpu output when you're *not* running with WEBKIT_DISABLE_COMPOSITING_MODE=1. I know you cannot see anything in that case, but if the mouse cursor works then it should change to a little hand rather than a little pointer when hovering the Copy to Clipboard link. Alternatively, you could just manually select and copy all the text even if you can't see what you're selecting.
Ah, I was afraid that might be the case =) After some blind clicking, I think this is it: { "Version Information": { "WebKit version": "WebKitGTK 2.41.6 (tarball)", "Operating system": "Linux 6.5.0-0.rc1.20230711git3f01e9fed845.12.fc39.x86_64 #1 SMP PREEMPT_DYNAMIC Wed Jul 12 14:03:10 UTC 2023 x86_64", "Desktop": "GNOME", "Cairo version": "1.17.8 (build) 1.17.8 (runtime)", "GStreamer version": "1.22.4 (build) GStreamer 1.22.4 (runtime)", "GTK version": "4.11.4 (build) 4.11.4 (runtime)" }, "Display Information": { "Type": "Wayland", "Screen geometry": "0,0 1280x800", "Screen work area": "0,0 1280x800", "Depth": "24", "Bits per color component": "8", "DPI": "96" }, "API": "OpenGL (libepoxy)", "Hardware Acceleration Information": { "Policy": "always", "WebGL enabled": "Yes", "Renderer": "DMABuf", "Native interface": "EGL", "GL_RENDERER": "llvmpipe (LLVM 16.0.5, 256 bits)", "GL_VENDOR": "Mesa", "GL_VERSION": "4.5 (Core Profile) Mesa 23.1.3", "GL_SHADING_LANGUAGE_VERSION": "4.50", 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Pull request: https://github.com/WebKit/WebKit/pull/15929
I can't reproduce it, because for me surfaceless display never claims to support EGL_MESA_image_dma_buf_export with llvmpipe driver, but I think the patch I pushed to https://github.com/WebKit/WebKit/pull/15929 should fix the issue.
Thanks! I guess it may depend on some fairly new feature in llvmpipe or mesa or something too, since we're seeing this on Rawhide. I will test the patch and let you know.
Can confirm that solves the problem! Thanks. Sorry, the scratch build took so long I wasn't able to test it yesterday. It also doesn't break things in an accelerated config.
Committed 266201@main (ad44d7bf323c): <https://commits.webkit.org/266201@main> Reviewed commits have been landed. Closing PR #15929 and removing active labels.