apport information ** Attachment added: "ShellJournal.txt" https://bugs.launchpad.net/bugs/1880723/+attachment/5377029/+files/ShellJournal.txt
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1880723 Title: gnome-shell high CPU usage on Ubuntu 20.04 Status in gnome-shell package in Ubuntu: New Bug description: After having a couple of terminals and and Chrome windows open for most of the day, everything becomes sluggish. Switching desktops is clearly very slow and Chrome's windows don't react to all mouse actions. Looking at htop I can see gnome-shell takes anywhere between 5% and 50% of CPU, normally between 10% and 20%. With Chrome and terminal windows open, an strace on the PID of gnome- shell shows the following: jpmeijers@jpmeijers-XPS13-9333:~$ sudo strace -c -p 3491 [sudo] password for jpmeijers: strace: Process 3491 attached ^Cstrace: Process 3491 detached % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 36.37 0.108651 3 30932 16434 recvmsg 34.99 0.104531 3 29278 poll 26.20 0.078272 5 14601 writev 1.06 0.003158 2 1181 ioctl 0.35 0.001041 2 430 write 0.27 0.000812 1 602 getpid 0.26 0.000773 4 158 read 0.11 0.000316 3 96 timerfd_create 0.10 0.000313 3 96 close 0.10 0.000300 4 73 4 futex 0.08 0.000241 2 96 timerfd_settime 0.07 0.000201 0 228 mprotect 0.04 0.000111 27 4 getrusage 0.01 0.000038 12 3 sendmsg 0.00 0.000008 0 11 munmap 0.00 0.000005 0 6 mmap 0.00 0.000002 1 2 1 recvfrom ------ ----------- ----------- --------- --------- ---------------- 100.00 0.298773 77797 16439 total After closing Chrome windows: jpmeijers@jpmeijers-XPS13-9333:~$ sudo strace -c -p 3491 strace: Process 3491 attached ^Cstrace: Process 3491 detached % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 36.24 0.099458 3 30319 15900 recvmsg 35.15 0.096450 3 29053 poll 26.86 0.073711 5 14500 writev 0.68 0.001858 1 930 ioctl 0.40 0.001092 3 318 write 0.14 0.000386 6 64 close 0.13 0.000344 0 469 getpid 0.11 0.000295 4 64 timerfd_create 0.11 0.000292 1 222 mprotect 0.06 0.000177 2 64 timerfd_settime 0.06 0.000153 6 25 munmap 0.04 0.000121 1 121 read 0.01 0.000038 0 49 4 futex 0.01 0.000018 6 3 sendmsg 0.00 0.000013 13 1 restart_syscall 0.00 0.000000 0 7 mmap 0.00 0.000000 0 2 getrusage ------ ----------- ----------- --------- --------- ---------------- 100.00 0.274406 76211 15904 total After closing the terminal windows too, therefore only the terminal running strace is open: jpmeijers@jpmeijers-XPS13-9333:~$ sudo strace -c -p 3491 strace: Process 3491 attached ^Cstrace: Process 3491 detached % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 36.43 0.196569 3 54115 27576 recvmsg 35.25 0.190224 3 53266 poll 26.92 0.145275 5 26592 writev 0.30 0.001631 4 405 write 0.23 0.001245 5 248 mprotect 0.23 0.001229 9 136 close 0.21 0.001120 1 621 ioctl 0.16 0.000889 6 136 timerfd_create 0.13 0.000711 5 136 timerfd_settime 0.06 0.000328 1 300 getpid 0.03 0.000180 2 68 3 futex 0.03 0.000159 1 85 read 0.01 0.000053 8 6 sendmsg 0.01 0.000027 3 9 mmap 0.00 0.000002 0 3 munmap 0.00 0.000002 0 4 getrusage 0.00 0.000000 0 1 recvfrom ------ ----------- ----------- --------- --------- ---------------- 100.00 0.539644 136131 27579 total I see the calls and errors to recvmsg climbing. What does this mean, and what is causing this? --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME DisplayManager: gdm3 DistroRelease: Ubuntu 20.04 InstallationDate: Installed on 2020-04-25 (31 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) Package: gnome-shell 3.36.2-1ubuntu1~20.04.1 PackageArchitecture: amd64 ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34 RelatedPackageVersions: mutter-common 3.36.2-1ubuntu1~20.04.1 Tags: focal Uname: Linux 5.4.0-31-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dialout dip docker lpadmin lxd plugdev sambashare sudo _MarkForUpload: True To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1880723/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
