https://bugs.kde.org/show_bug.cgi?id=455625
Bug ID: 455625
Summary: Deleting copied file triggers Klipper::checkClipData
-> Klipper::setClipboard -> repeat storm with memleak
of QMimeData objects
Product: plasmashell
Version: 5.24.4
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Clipboard
Assignee: plasma-b...@kde.org
Reporter: philipp-...@knechtges.com
Target Milestone: 1.0
SUMMARY
This bug report potentially reveals two issues:
- An infinite loop in Klipper, if the clip data is an deleted file.
- A memleak in Klipper::checkClipData or Klipper::setClipboard when dealing
with QMimeData
STEPS TO REPRODUCE
(0. Optionally start plasmashell with environment variable
QT_LOGGING_RULES="org.kde.klipper.debug=true" set)
1. Open Dolphin, create some temporary file. Let's call it "a.txt"
2. "Ctrl+C" this file "a.txt".
3. Now delete the "a.txt" file with "Shift+DEL".
4. Watch the memory consumption of plasmashell grow indefinitely.
5. "Ctrl+C" sth else and observe how the growth stops.
OBSERVED RESULT
1. Watch memory consumption of plasmashell grow
2. Qt logging output will yield a loop of the following
org.kde.klipper: Checking clip data
org.kde.klipper: was empty. Retried, now still empty
org.kde.klipper: Resetting clipboard (Prevent empty clipboard)
org.kde.klipper: Setting clipboard to < "file:///home/asd/a.txt" >
org.kde.klipper: Checking clip data
org.kde.klipper: was empty. Retried, now still empty
org.kde.klipper: Resetting clipboard (Prevent empty clipboard)
org.kde.klipper: Setting clipboard to < "file:///home/asd/a.txt" >
org.kde.klipper: Checking clip data
org.kde.klipper: was empty. Retried, now still empty
org.kde.klipper: Resetting clipboard (Prevent empty clipboard)
org.kde.klipper: Setting clipboard to < "file:///home/asd/a.txt" >
org.kde.klipper: Checking clip data
org.kde.klipper: was empty. Retried, now still empty
org.kde.klipper: Resetting clipboard (Prevent empty clipboard)
org.kde.klipper: Setting clipboard to < "file:///home/asd/a.txt" >
org.kde.klipper: Checking clip data
org.kde.klipper: was empty. Retried, now still empty
org.kde.klipper: Resetting clipboard (Prevent empty clipboard)
org.kde.klipper: Setting clipboard to < "file:///home/asd/a.txt" >
EXPECTED RESULT
- no memleak in plasmashell
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version:
KDE Frameworks Version:
Qt Version:
ADDITIONAL INFORMATION
Attaching to plasmashell with heaptrack reveals that the leaks come from
QMimeData::QMimeData() and QMimeData::setData calls. Unfortunately, the rest of
the heaptrack log is not so useful, since heaptrack mixes up symbols for .so
files with dwarf version 6 debug info.
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