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After a fix to glibc that fixed Unity 3D based games (Fedora ref: https:// bugzilla.redhat.com/show_bug.cgi?id=1440287), I have noticed that when I play Cities: Skylines that the system becomes unresponsive when digging into swap. I have 10Gb of RAM in this system and run Fedora 26. If I launch Cities: Skylines with no swap space, things run well performance wise until I get an OOM - and it all dies - which is expected. When I turn on swap to /dev/sda2 which resides on an SSD, I get complete system freezes while swap is being accessed. The first swap was after loading a saved game, then launching kmail in the background. This caused ~500Mb to be swapped to /dev/sda2 on an SSD. The system froze for about 8 minutes - barely being able to move the mouse. The HDD LED was on constantly during the entire time. To hopefully rule out the above glibc issue, I started the game via jemalloc - but experienced even more severe freezes while swapping. I gave up waiting after 13 minutes of non-responsiveness - not even being able to move the mouse properly. During these hangs, I could typed into a Konsole window, and some of the typing took 3+ minutes to display on the screen (yay for buffers?). I have tested this with both the default vm.swappiness values, as well as the following: vm.swappiness = 1 vm.min_free_kbytes = 32768 vm.vfs_cache_pressure = 60 I noticed that when I do eventually get screen updates, all 8 cpus (4 cores / 2 threads) show 100% CPU usage - and kswapd is right up there in the process list for CPU usage. Sadly I haven't been able to capture this information fully yet due to said unresponsiveness. This seems to be a relatively new problem that I did not encounter during the Fedora 26 beta - but do now.
Forgot to add kernel version! Currently testing with: kernel-4.11.10-300.fc26.x86_64
Related bug reports: https://bugzilla.redhat.com/show_bug.cgi?id=1357032 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/159356
We apologize for the inconvenience. There is a large number of bugs to go through and several of them have gone stale. The kernel moves very fast so bugs may get fixed as part of a kernel update. Due to this, we are doing a mass bug update across all of the Fedora 26 kernel bugs. Fedora 26 has now been rebased to 4.15.4-200.fc26. Please test this kernel update (or newer) and let us know if you issue has been resolved or if it is still present with the newer kernel. If you have moved on to Fedora 27, and are still experiencing this issue, please change the version to Fedora 27. If you experience different issues, please open a new bug report for those.
it still happens with Fedora 28
I don't have a system I can randomly remove RAM from now to test. My current system is unhappy running on a single RAM stick. Report above still says it occurs, so I would say this is still an issue in recent kernels.
This message is a reminder that Fedora 26 is nearing its end of life. Approximately 4 (four) weeks from now Fedora will stop maintaining and issuing updates for Fedora 26. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a Fedora 'version' of '26'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora 26 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Fedora version prior this bug is closed as described in the policy above. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete.
Fedora 26 changed to end-of-life (EOL) status on 2018-05-29. Fedora 26 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.