Kdeconnectd uses 100%

Bug #1396367 reported by Brain
54
This bug affects 12 people
Affects Status Importance Assigned to Milestone
kdeconnect (Ubuntu)
Critical
Unassigned

Bug Description

After several hours from system start-up kdeconnectd starts using 100% of the CPU.

"top" listing:
  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
 5330 brain 20 0 409156 27332 21604 R 100.0 0.4 352:30.94 kdeconnectd

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: kdeconnect 0.5.2.1-0ubuntu0.1
Uname: Linux 3.16.0-031600rc5-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CurrentDesktop: KDE
Date: Tue Nov 25 23:08:23 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-06-15 (528 days ago)
InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
SourcePackage: kdeconnect
UpgradeStatus: Upgraded to trusty on 2014-05-30 (179 days ago)

Revision history for this message
Brain (brain) wrote :
Revision history for this message
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in kdeconnect (Ubuntu):
status: New → Confirmed
Revision history for this message
Peter Ullinger (upthere) wrote :

Same here with

Package: 0.7.1-0ubuntu3
CurrentDesktop: KDE
DistroRelease: 14.10 utopic

tags: added: utopic
Changed in kdeconnect (Ubuntu):
importance: Undecided → Critical
Revision history for this message
Javier Scappini (jscappini) wrote :

I noted that this happens (at least to me) every time my smartphone disconnects from the wifi my laptop is connected to. If I get out of the wifi range, kdeconnect starts to eat my cpu, every time.

Package: 0.7.1-0ubuntu3
Kubuntu 14.10
Qt: 4.8.6
KDE: 4.14.1

Revision history for this message
Mathew Shires (mathewshires) wrote :

When I run kdeconnectd from the terminal the error that appears before it uses all the CPU is:
"fusermount: entry for /home/matty/.kde/share/apps/kdeconnect/caed8a53d8d7bee7 not found in /etc/mtab"

Revision history for this message
Eddie Dunckley (eddiedunckley) wrote :

kdeconnect 0.7.3-0ubuntu1~ubuntu14.04.1

strace reveals its stuck in infinite loop reading a dead resource

LLIN}])
[pid 7539] read(3, "\2\0\0\0\0\0\0\0", 16) = 8
[pid 7539] recvmsg(7, 0xbf819a24, 0) = -1 EAGAIN (Resource temporarily unavailable)
[pid 7539] write(3, "\1\0\0\0\0\0\0\0", 8) = 8
[pid 7539] write(3, "\1\0\0\0\0\0\0\0", 8) = 8
[pid 7539] clock_gettime(CLOCK_MONOTONIC, {1479222, 248670395}) = 0
[pid 7539] recvmsg(7, 0xbf819a04, 0) = -1 EAGAIN (Resource temporarily unavailable)
[pid 7539] poll([{fd=3, events=POLLIN}, {fd=7, events=POLLIN}, {fd=9, events=POLLIN}, {fd=13, events=POLLIN}, {fd=15, events=POLLIN}, {fd=16, events=POLLIN}, {fd=5, events=POLLIN}, {fd=20, events=POLLIN}, {fd=21, events=POLLIN}, {fd=10, events=POLLIN}, {fd=51, events=POLLIN}, {fd=52, events=POLLIN}, {fd=8, events=POLLIN}, {fd=57, events=POLLIN}], 14, 0) = 1 ([{fd=3, revents=POLLIN}])
[pid 7539] read(3, "\2\0\0\0\0\0\0\0", 16) = 8
[pid 7539] recvmsg(7, 0xbf819a24, 0) = -1 EAGAIN (Resource temporarily unavailable)
[pid 7539] write(3, "\1\0\0\0\0\0\0\0", 8) = 8
[pid 7539] write(3, "\1\0\0\0\0\0\0\0", 8) = 8
[pid 7539] clock_gettime(CLOCK_MONOTONIC, {1479222, 249052541}) = 0
[pid 7539] recvmsg(7, 0xbf819a04, 0) = -1 EAGAIN (Resource temporarily unavailable)
[pid 7539] poll([{fd=3, events=POLLIN}, {fd=7, events=POLLIN}, {fd=9, events=POLLIN}, {fd=13, events=POLLIN}, {fd=15, events=POLLIN}, {fd=16, events=POLLIN}, {fd=5, events=POLLIN}, {fd=20, events=POLLIN}, {fd=21, events=POLLIN}, {fd=10, events=POLLIN}, {fd=51, events=POLLIN}, {fd=52, events=POLLIN}, {fd=8, events=POLLIN}, {fd=57, events=POLLIN}], 14, 0) = 1 ([{fd=3, revents=POLLIN}])

Revision history for this message
dotancohen (dotancohen) wrote :

In addition to CPU, sometimes kdeconnectd will use upwards of 300 MiB of RSS:

USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
dotanco+ 1787 1.0 11.6 1055976 342448 ? Sl Nov19 172:14 /usr/lib/x86_64-linux-gnu/libexec/kdeconnectd

This is my system:

$ cat /etc/issue
Ubuntu 15.10 \n \l

$ uname -a
Linux loathe 4.2.0-17-generic #21-Ubuntu SMP Fri Oct 23 19:56:16 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Revision history for this message
qydw (qydwhotmail) wrote :

Operating System: Kubuntu 21.04
KDE Plasma Version: 5.21.3
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2
Kernel Version: 5.11.0-13-generic
OS Type: 64-bit
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i5-3337U CPU @ 1.80GHz
Memory: 3.7 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 4000

I searched on the Internet and found someone also reported on KDE bugtracking system.
Some KDE processes (like kdeconnectd) are not killed after session logout, hog CPU
https://bugs.kde.org/show_bug.cgi?id=433293
The workaround is to configure systemd to KillUserProcesses=yes in /etc/systemd/logind.conf. Although this is most definitely a bug.(https://www.reddit.com/r/kde/comments/lnscdt/kdeconnectd_hogs_cpu/)

Revision history for this message
technobab (mikesafe) wrote :

I confirm same problem as qqydw (qydwhotmail)

Operating System: Kubuntu 21.04
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2
Kernel Version: 5.11.0-16-generic
OS Type: 64-bit
Graphics Platform: X11
Processors: 3 × AMD Phenom(tm) 8650 Triple-Core Processor
Memory: 3.8 GiB of RAM
Graphics Processor: AMD RV730

kdeconnectd is using 100% of cpu (2 instances)
processor temperature reached and remained at 66 deg C
solved easily temporarily by kill -9 both instances
cpu temperature went down to 42 deg C and stable , cpu 10% after kill

apart from that, plasma 5.21.3 is great, I love it.

Revision history for this message
pqwoerituytrueiwoq (pqwoerituytrueiwoq) wrote :

noticed this issue twice today on Kubuntu 22.04

from what i can tell this package is used for communicating with phones, this is not something i would bother using

no idea why this would be sitting there randomly eating 100% of 2 cores waiting on something to happen when i never tried to do anything with a phone

Revision history for this message
Cass Stephen (madeoutofsprings) wrote (last edit ):

Operating System: Kubuntu 21.10
DE: KDE 5.86.0 / Plasma 5.22.5
see also bug/1922465

When a second user attempts to log out it appears to log out, but afterwards gradually the fans rise to full speed.

If the first user (never logged out just locked) logs back in and runs sudo htop you can see 60ish pids running in the name of the second user, 6ish of those are using 100% of all cores.

The pids that are hogging are xdg-desktop-portal-kde and at least one kdeconnectd, usually multiple threads of kdeconnectd.

Each of the threads that those pids are in are end with a drconqi pid that, if you kill it, the entire thread closes and that core frees up.

If all of the hogging threads are killed in that way that still leaves 50ish pids running in the name of the second user, but they use 0% CPU. I have been killing all of second users threads without noticing any repercussions.

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