Thank you so much for getting back to me so quickly. I've deleted the extensions as you suggested, and I can now reproduce the problem easily.
The issue being related to virtual memory is very strange, I agree. Under normal circumstances I could see a program's RSS usage climb up until it eats up the memory. However, in this case I can't observe anything like that - RSS usage stays constant, and the only thing that climbs up is the virtual memory. However, the effects are the same as if the program was consuming RSS memory: Ubuntu will start feel sluggish, programs will start responding slower and slower (probably they're swapped out), and at some point a program crashes with out-of-memory. You can observe this behavior with 24GB of RAM and 4GB of swap, however it takes an hour in this kind of setup - that's why I've recorded a video reproducing the issue on a VM with 4GB RAM/0GB swap. I'll attach the video shortly. Steps to reproduce: 1. Create a VM (arm64 with 4GB of RAM/0GB of swap running in UTM/MacBook M3 Max; but I'm setting up an Ubuntu-on-Ubuntu x86-64 machine and I'll test the same thing there as well). 2. Install Ubuntu 25.10 (or install Ubuntu 25.04 and upgrade it to Ubuntu 25.10) 3. Run `htop` and `watch free` in two separate terminals. 4. Run `head -c 2G /dev/zero | tail | sleep 10` - it works 5. Now start alt-tabbing between terminal windows, or try moving the console window around with super+arrow keys, and observe the shared memory usage climbing up, both in `htop` and in `free` 6. After some time, re-run `head -c 2G /dev/zero | tail | sleep 10` and watch it crash I've recorded my desktop and posted it on YouTube: https://youtu.be/fFmwWh9LM84 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2122654 Title: Ubuntu 25.10 uses increasingly lots of memory To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/2122654/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
