This is already fixed in Debian as bug #1142771 (https://bugs.debian.org/1142771), resolved by maintainer Alberto Garcia in webkit2gtk 2.53.90-1 (2026-08-10), changelog: "Use the SHM transport with NVIDIA GPUs (Closes: #1142771)".
Ubuntu 26.04 still ships 2.52.6-0ubuntu0.26.04.1, which carries the older disable-nvidia-dmabuf.patch that disables the SharedMemory transport on NVIDIA too (not just DMABuf), leaving AcceleratedBackingStore null and crashing the UI process (SIGSEGV in AcceleratedBackingStore::update via EnterAcceleratedCompositingMode) as soon as a page forces compositing. Request: backport the Debian fix (keep the SHM transport on NVIDIA — move the isNVIDIA() early-return after mode.add(SharedMemory)) to 26.04's 2.52.6, or sync a webkit2gtk that already contains it. A standalone patch is attached to this bug. ** Bug watch added: Debian Bug tracker #1142771 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1142771 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2167164 Title: disable-nvidia-dmabuf.patch also disables SharedMemory transport, causing null AcceleratedBackingStore SIGSEGV on NVIDIA To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/webkit2gtk/+bug/2167164/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
