https://bugs.kde.org/show_bug.cgi?id=393748
Bug ID: 393748
Summary: Plasma freezes on multiple file CUT - Length of time
determined by number of file
Product: dolphin
Version: 18.04.0
Platform: Neon Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: dolphin-bugs-n...@kde.org
Reporter: nick.craig....@gmail.com
CC: elvis.angelac...@kde.org
Target Milestone: ---
The bug I'm about to describe is 100% reproducible on three different KDE based
systems, an I7/Nvidia GPU laptop, a AMD/Nvidia desktop and a I5/Intel GPU
desktop. (version details at the end of this report).
Although I have specified this bug as Dolphin it has a severe affect on the
plasma desktop & panel. I find it surprising the desktop freezes when cutting &
pasting, surely dolphin & plasma are different processes and shouldn't cause
each other to hang ?
If you use Dolphin to CUT (copy not affected) multiple files the plasma desktop
and panel freeze for a period of time. The period of time plasma freezes for is
subject to the number of files being cut & pasted. If you are cutting one or
two files you won't notice a problem, if you are cutting & pasting 100+ files
you will see a freeze that lasts nearly 60 seconds on a I7 based system, much
longer on lower powered systems. When you experience this freeze Dolphin is
sending the following messages to std-err "QXcbClipboard: SelectionRequest too
old"
** How to reproduce this bug **
To reproduce this bug I would first suggest you always have the plasma task
panel visible, if your using auto-hide disable it, you want the panel visible
at all times so you can see it freeze. In addition enable the seconds display
on the digital clock that resides on the plasma panel. This allows you to see
when and for how long plasma freezes.
Create two directories on the same disk/partition ie /home/bloggs/test1 and
/home/bloggs/test2 as follows ..
cd /home/myusername
mkdir /home/myusername/test1 /home/myusername/test2
Then populate the directory test1 with 120 files, each 1Mbyte in size. I use
the following command to do this, the size is not that important however the
number of files is directly proportional to the length of time plasma hangs..
cd /home/myusername/test1
n=0;while [ $n -lt 120 ]; do dd if=/dev/urandom of=file$n bs=1M
count=1;((n++));done;
Next, start dolphin from the command line so you can monitor the stdout/stderr
messages it produces.
Then within dolphin, navigate to the /home/myusername/test1 directory and do a
CNTRL A to select all files, then click right on the select files and select
CUT (NOT COPY) and then navigate to /home/myusername/test2 and paste.
You will see the files get pasted in the view pane AND the seconds on the clock
will freeze for 48 seconds (as seen on my I7 laptop).
During this time all desktop widgets freeze and clicking on any shortcuts
doesn't appear to work or at least not yet, not until the freeze ends. While
the desktop is frozen the files have already been cut & pasted within a second,
however Dolphin is outputting over 1000 messages to stderr, all repeating
"QXcbClipboard: SelectionRequest too old".
At the end of the plasma freeze all the icons you clicked on are then
activated.
I varied the number of files I was cutting & pasting and found the following ..
1 to 2 file cut & paste, Dolphin DOES NOT output "QXcbClipboard:
SelectionRequest too old" at all.
3 to 6 files cut and pasted. Dolphin outputs "QXcbClipboard: SelectionRequest
too old" to stderr 50 times, causing plasma to freeze for about 3 seconds.
15 files cut & pasted, Dolphin outputs "QXcbClipboard: SelectionRequest too
old" to stderr 129 times, causing plasma to freeze for about 6 seconds.
30 files cut & pasted, Dolphin outputs "QXcbClipboard: SelectionRequest too
old" to stderr 288 times, causing plasma to freeze for about 12 seconds.
60 files cut & pasted, Dolphin outputs "QXcbClipboard: SelectionRequest too
old" to stderr 566 times, causing plasma to freeze for about 24 seconds.
120 files cut & pasted, Dolphin outputs "QXcbClipboard: SelectionRequest too
old" to stderr 1,169 ! times, causing Plasma to freeze for 48 seconds.
It would seem that the more files you cut & paste the longer plasma freezes
for.
The systems I'm testing this on are as follows, of note is the fact this
problem exists on KDE Plasma 5.12.4 (the latest stable) and on an earlier 5.8.9
and I'm assuming all version in between and possibly earlier ?
Can somebody test this using the method I've outlined above and see if you also
can confirm this bug .. Thanks.
Laptop: KDE NEON LTS 5.12
8-core I72670QM@2.2GHz, 16Gbyte memory, Nvidia GTX 570M/PCIe/SSE2, Nvidia
driver 4.5.0 NVIDIA 384.130, Plasma 5.12.4, KDE frameworks 5.45.0, QT version
5.9.3, kernel 4.13.0-39-generic, 64bit. Dolphin version 18.04.0.
Desktop #1: Kubuntu 16.04
8-core AMD FX 8350, 24Gbyte memory, Nvidia GT610/PCIe/SSE2, driver 4.4.0 NVIDIA
340.104, Plasma 5.8.9, frameworks 5.36.0, QT version 5.6.1, kernel
4.4.0-119-generic, 64 bit.
Desktop #2
4-core Intel i5-7400@3.00GHz, Intel Open source technology MESA DRI Intel HD
Graphics 630 (Kaby Lake GT2), Plasma 5.12.4, KDE frameworks 5.45.0, QT Version
5.10.0, kernel 4.13.0-39-generic, 64 bit.
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