| Summary: | plasmashell hangs at a futex related to QXcbConnection::xi2HandleDeviceChangedEvent | ||
|---|---|---|---|
| Product: | [Plasma] plasmashell | Reporter: | Pellaeon Lin <nfsmwlin> |
| Component: | generic-performance | Assignee: | Plasma Bugs List <plasma-bugs> |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | normal | CC: | nate |
| Priority: | NOR | ||
| Version: | 5.25.5 | ||
| Target Milestone: | 1.0 | ||
| Platform: | Ubuntu | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | ||
| Sentry Crash Report: | |||
| Attachments: | backtrace | ||
Thank you for the bug report! Please note that Plasma 5.25.5 is not supported for much longer by KDE; supported versions are 5.24, and 5.26 or newer. If at all possible please upgrade to a supported version and verify that the bug is still happening there. If you're unsure how to do this, contact your distributor about it. The bug happened a few more times after my initial reporting, usually once around every 3 days. I'd like to add a few points of observations and questions: When the last time freeze happened, I tried doing the following things: 1. Switch to tty2 using Ctrl+Alt+F2 and log in 2. Run `killall plasmashell` 3. Switch back to tty1 using Ctrl+Alt+F1 4. I observe that the screen does not change, displaying the same content as it was frozen. It does not respond to any keyboard input (except for Capslock). I can still move the mouse but clicking has no effect. 5. I observe that I can still toggle Caps Lock (the light will switch on/off). I have the following questions: 1. According to this thread https://forum.manjaro.org/t/plasmashell-freezes/127677 , `killall plasmashell` should stop the shell and I can launch a new terminal and run `plasmashell --replace` to restart it. However as I mentioned in (4) above it stays frozen. Does this mean that this problem is not related to plasmashell? 2. According to https://wiki.ubuntu.com/X/Troubleshooting/Freeze , my symptons might indicate a X server issue? I saw a similar bug report https://bugs.kde.org/show_bug.cgi?id=457847 and tried its workaround downgrading Mesa. It seems to work. I haven't experienced any freezes for two weeks now. Closing this as duplicate. *** This bug has been marked as a duplicate of bug 457847 *** |
Created attachment 155554 [details] backtrace SUMMARY Plasmashell and applications freeze randomly, none of them respond to keyboard or mouse input. I use my computer everyday and this happens about twice a week. It only happens since my upgrade from Ubuntu 22.04 to 22.10. I switched to tty and used `sudo strace -p` on the plasmashell process. It showed that plasmashell stucked at a futex call. I loaded the debug symbols and attached the process with gdb. It showed that plasmashell stuck at a xcb_wait_for_reply call inside QXcbConnection::xi2HandleDeviceChangedEvent. However, I did not plug / unplug any device from the computer at the time of freeze. This freeze also happens when the computer (Thinkpad X13 Gen 2 AMD) is not connected to any external device (no bluetooth device either). The backtrace is attached. I understand this might be hard to debug, so please tell me things I can try and information to collect, and I will collect them when the next crash happens. STEPS TO REPRODUCE 1. Use desktop normally OBSERVED RESULT Desktop freezes EXPECTED RESULT Desktop not freeze SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Ubuntu 22.10 (System installed via Ubuntu installer, then apt install kubuntu-desktop afterwards) (available in About System) KDE Plasma Version: 5.25.5 KDE Frameworks Version: 5.98.0 Qt Version: 5.15.6 ADDITIONAL INFORMATION Graphics platform: X11