Bug 408885 - plasmashell is nearly maxing out one of my cpu cores constantly since 5.16.1 update
Summary: plasmashell is nearly maxing out one of my cpu cores constantly since 5.16.1 ...
Status: RESOLVED WORKSFORME
Alias: None
Product: plasmashell
Classification: Plasma
Component: general (show other bugs)
Version: 5.16.1
Platform: Neon Linux
: NOR normal
Target Milestone: 1.0
Assignee: David Edmundson
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-06-18 20:47 UTC by Doug
Modified: 2019-07-03 09:12 UTC (History)
1 user (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
attachment-28289-0.html (9.37 KB, text/html)
2019-06-18 23:44 UTC, Doug 		Details
attachment-15819-0.html (1.57 KB, text/html)
2019-06-19 16:56 UTC, Doug 		Details
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Description Doug 2019-06-18 20:47:33 UTC 
SUMMARY
Since updating plasmashell is working one of my CPU cores at or near max constantly, causing my computer to run slow.  No problems before update to 5.16.1.

STEPS TO REPRODUCE
1. It's happening at all times I'm logged in
2. 
3. 

OBSERVED RESULT
Computer is running slow.  plasmashell process is observed to be using one of my CPU cores to near max at all times.

EXPECTED RESULT
Computer runs smoothly and efficiently (it did in 5.16.0)

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: KDE Neon 5.16 User Edition
(available in About System)
KDE Plasma Version: 5.16.1
KDE Frameworks Version: 5.59.0
Qt Version: 5.12.3

ADDITIONAL INFORMATION
Linux Kernel 4.15.0-52 generic
CPU- 4 x Intel Core i3 CPU M 370 @ 2.40 GHz
3.5 GiB RAM
Intel Integrated Graphics Processor
Comment 1 David Edmundson 2019-06-18 21:58:52 UTC 
Can you run

"sudo gdb --pid `pidof plasmashell` when it's at full CPU
and type "bt" then "continue"  and do that a few times and paste the result.



(or ideally run hotspot and attach the flamegraph, but that's arguably harder)
Comment 2 Doug 2019-06-18 23:44:32 UTC 
Created attachment 120989 [details]
attachment-28289-0.html

Hello David!

Thank you so much for getting back to me so soon.  Here is the results of
gdb --pid:

GNU gdb (Ubuntu 8.1-0ubuntu3) 8.1.0.20180409-git
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html
>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".
Attaching to process 1306
[New LWP 1317]
[New LWP 1342]
[New LWP 1398]
[New LWP 1431]
[New LWP 1464]
[New LWP 1465]
[New LWP 1485]
[New LWP 1486]
[New LWP 1521]
[New LWP 1746]
[New LWP 1747]
[New LWP 4765]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007f2d1f268b64 in QIODevicePrivate::read(char*, long long, bool) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
(gdb) bt
#0  0x00007f2d1f268b64 in QIODevicePrivate::read(char*, long long, bool) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007f2d1f3afa57 in QDataStream::readBlock(char*, int) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f2d1f3afbea in QDataStream::operator>>(long long&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f2d1f204339 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f2d1f209444 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f2d1f20991c in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f2d1f1fc788 in QTimeZone::QTimeZone(QByteArray const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f2d1f1fc8cf in QTimeZone::systemTimeZone() ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f2d22db79a8 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f2d22e91c76 in
QV4::Runtime::method_callPropertyLookup(QV4::ExecutionEngine*, QV4::Value*,
unsigned int, QV4::Value*, int) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f2cf4e629fa in ?? ()
#11 0x0000000000000000 in ?? ()
(gdb) bt
#0  0x00007f2d1f268b64 in QIODevicePrivate::read(char*, long long, bool) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007f2d1f3afa57 in QDataStream::readBlock(char*, int) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f2d1f3afbea in QDataStream::operator>>(long long&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f2d1f204339 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f2d1f209444 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f2d1f20991c in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f2d1f1fc788 in QTimeZone::QTimeZone(QByteArray const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f2d1f1fc8cf in QTimeZone::systemTimeZone() ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f2d22db79a8 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f2d22e91c76 in
QV4::Runtime::method_callPropertyLookup(QV4::ExecutionEngine*, QV4::Value*,
unsigned int, QV4::Value*, int) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f2cf4e629fa in ?? ()
#11 0x0000000000000000 in ?? ()
(gdb) bt
#0  0x00007f2d1f268b64 in QIODevicePrivate::read(char*, long long, bool) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007f2d1f3afa57 in QDataStream::readBlock(char*, int) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f2d1f3afbea in QDataStream::operator>>(long long&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f2d1f204339 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f2d1f209444 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f2d1f20991c in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f2d1f1fc788 in QTimeZone::QTimeZone(QByteArray const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f2d1f1fc8cf in QTimeZone::systemTimeZone() ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f2d22db79a8 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f2d22e91c76 in
QV4::Runtime::method_callPropertyLookup(QV4::ExecutionEngine*, QV4::Value*,
unsigned int, QV4::Value*, int) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f2cf4e629fa in ?? ()
#11 0x0000000000000000 in ?? ()
(gdb) bt
#0  0x00007f2d1f268b64 in QIODevicePrivate::read(char*, long long, bool) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007f2d1f3afa57 in QDataStream::readBlock(char*, int) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f2d1f3afbea in QDataStream::operator>>(long long&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f2d1f204339 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f2d1f209444 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f2d1f20991c in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f2d1f1fc788 in QTimeZone::QTimeZone(QByteArray const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f2d1f1fc8cf in QTimeZone::systemTimeZone() ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f2d22db79a8 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f2d22e91c76 in
QV4::Runtime::method_callPropertyLookup(QV4::ExecutionEngine*, QV4::Value*,
unsigned int, QV4::Value*, int) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f2cf4e629fa in ?? ()
#11 0x0000000000000000 in ?? ()
(gdb) bt
#0  0x00007f2d1f268b64 in QIODevicePrivate::read(char*, long long, bool) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007f2d1f3afa57 in QDataStream::readBlock(char*, int) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f2d1f3afbea in QDataStream::operator>>(long long&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f2d1f204339 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f2d1f209444 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f2d1f20991c in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f2d1f1fc788 in QTimeZone::QTimeZone(QByteArray const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f2d1f1fc8cf in QTimeZone::systemTimeZone() ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f2d22db79a8 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f2d22e91c76 in
QV4::Runtime::method_callPropertyLookup(QV4::ExecutionEngine*, QV4::Value*,
unsigned int, QV4::Value*, int) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f2cf4e629fa in ?? ()
#11 0x0000000000000000 in ?? ()
(gdb)


Thank you!

-Doug



On Tue, Jun 18, 2019 at 5:58 PM David Edmundson <bugzilla_noreply@kde.org>
wrote:

> https://bugs.kde.org/show_bug.cgi?id=408885
>
> David Edmundson <kde@davidedmundson.co.uk> changed:
>
>            What    |Removed                     |Added
>
> ----------------------------------------------------------------------------
>          Resolution|---                         |WAITINGFORINFO
>              Status|REPORTED                    |NEEDSINFO
>
> --- Comment #1 from David Edmundson <kde@davidedmundson.co.uk> ---
> Can you run
>
> "sudo gdb --pid `pidof plasmashell` when it's at full CPU
> and type "bt" then "continue"  and do that a few times and paste the
> result.
>
>
>
> (or ideally run hotspot and attach the flamegraph, but that's arguably
> harder)
>
> --
> You are receiving this mail because:
> You reported the bug.
Comment 3 David Edmundson 2019-06-19 08:48:41 UTC 
Can you remove the clock and see if it goes away?

I have one other report of the agenda on the clock view constantly repainting.

It's hard to guage what code you're in, but it's something with timezone lookups so that seems similar.
Comment 4 Doug 2019-06-19 16:56:50 UTC 
Created attachment 121007 [details]
attachment-15819-0.html

Hello David,

When I started my computer this morning, it didn't have the problem that I
reported yesterday.  Before I reported the bug yesterday I tried logging in
and out to restart Plasma, and rebooting, but maybe because it was shut
down and left off for a while overnight that made the difference.  I turned
the computer on and off a couple of times to make sure it didn't come back,
and it didn't.  Sorry if this wasted any of your time, and thank you for
your help!

Regards,
Doug

On Wed, Jun 19, 2019 at 4:48 AM David Edmundson <bugzilla_noreply@kde.org>
wrote:

> https://bugs.kde.org/show_bug.cgi?id=408885
>
> --- Comment #3 from David Edmundson <kde@davidedmundson.co.uk> ---
> Can you remove the clock and see if it goes away?
>
> I have one other report of the agenda on the clock view constantly
> repainting.
>
> It's hard to guage what code you're in, but it's something with timezone
> lookups so that seems similar.
>
> --
> You are receiving this mail because:
> You reported the bug.
Comment 5 Christoph Feck 2019-07-03 09:12:54 UTC 
Thanks for the update; changing status.