Public bug reported:
I am getting high CPU from gnome-shell and I can't track down whats
causing the issue.
$ strace: Process 2793 detached
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
38.27 0.047677 1 26640 13464 recvmsg
35.76 0.044550 1 26406 poll
25.77 0.032103 2 13191 writev
0.08 0.000100 2 37 write
0.05 0.000068 0 144 mprotect
0.04 0.000044 0 60 52 stat
0.01 0.000018 0 22 3 futex
0.01 0.000013 0 72 getpid
0.00 0.000006 0 23 read
0.00 0.000003 3 1 sendmsg
0.00 0.000000 0 3 mmap
0.00 0.000000 0 2 munmap
0.00 0.000000 0 86 ioctl
------ ----------- ----------- --------- --------- ----------------
100.00 0.124582 66687 13519 total
$ sudo strace -p 2793 -e trace=recvmsg
recvmsg(19, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(19, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\34\0J\356\7\0`\0\301\1\0\0\32\344HM\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(19, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(19, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\34\0K\356\7\0`\0\301\1\0\0\32\344HM\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(19, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(19, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\34\0L\356\7\0`\0\301\1\0\0\33\344HM\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
$ ls -al /proc/2793/fd/19
lrwx------ 1 <removed> <removed> 64 Apr 15 09:07 /proc/2793/fd/19 ->
'socket:[59892]'
lsof |grep 59892
lsof: WARNING: can't stat() nsfs file system /run/docker/netns/11c4a1f5359b
Output information may be incomplete.
lsof: WARNING: can't stat() nsfs file system /run/docker/netns/d603ef1fe841
Output information may be incomplete.
lsof: WARNING: can't stat() nsfs file system /run/docker/netns/a9c329decb40
Output information may be incomplete.
gnome-she 2793 <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
gnome-she 2793 2802 gmain <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
gnome-she 2793 2805 gdbus <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
gnome-she 2793 2806 dconf\x20 <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
gnome-she 2793 2808 gnome-s:d <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
gnome-she 2793 2809 gnome-s:d <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
gnome-she 2793 2810 gnome-s:d <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
gnome-she 2793 2811 gnome-s:d <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
gnome-she 2793 2813 JS\x20Hel <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
gnome-she 2793 2814 JS\x20Hel <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
gnome-she 2793 2815 JS\x20Hel <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
gnome-she 2793 2816 JS\x20Hel <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
gnome-she 2793 2817 JS\x20Hel <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
gnome-she 2793 2818 JS\x20Hel <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
gnome-she 2793 2819 JS\x20Hel <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
gnome-she 2793 2820 JS\x20Hel <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
gnome-she 2793 5764 threaded- <removed> 19u unix
0x0000000000000000 0t0 59892 type=STREAM
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell 3.36.7-0ubuntu0.20.04.1
ProcVersionSignature: Ubuntu 5.8.0-48.54~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-48-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Apr 15 08:53:43 2021
DisplayManager: gdm3
InstallationDate: Installed on 2021-02-05 (68 days ago)
InstallationMedia: Ubuntu 20.04.2 LTS "Focal Fossa" - Release amd64 (20210204)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
RelatedPackageVersions: mutter-common 3.36.7+git20201123-0.20.04.1
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
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https://bugs.launchpad.net/bugs/1924550
Title:
High CPU from gnome-shell with high errors for recvmsg
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