Public bug reported: Environment:
OS: Kubuntu 25.10 (Plucky Puffin) PPA: ppa:kubuntu-ppa/backports Plasma Version: 6.5.5 Session: Wayland Graphics: NVIDIA (Driver 580.126.09) Issue: I have identified a persistent file descriptor leak in plasmashell. Every time a window thumbnail preview is triggered in the Task Manager, the process leaks exactly 4 file descriptors. Since my system is on Wayland with NVIDIA, this quickly leads to reaching the FD limit, causing plasmashell to become unresponsive or crash. Steps to reproduce: Use Kubuntu 25.10 with the Backports PPA (Plasma 6.5.5). Monitor FD count: watch "ls /proc/$(pidof plasmashell)/fd | wc -l" Hover over a taskbar icon to show a thumbnail preview, then move away. Observe the FD count increasing by 4 every time. Key Findings: This is confirmed to be related to the new Explicit Sync implementation. Setting __NV_DISABLE_EXPLICIT_SYNC=1 completely stops the leak. Upstream KDE bug report: https://bugs.kde.org/show_bug.cgi?id=516950 Request: Since Plasma 6.6 is already out and likely contains fixes for synchronization logic, could the Kubuntu Backports team please look into backporting the fix or updating the PPA to a newer point release? This bug makes the current backport unstable for NVIDIA users. ** Affects: plasma-workspace (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2143044 Title: File descriptor leak in plasmashell (Task Manager thumbnails) on Kubuntu 25.10 with Backports PPA To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-workspace/+bug/2143044/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
