[frameworks-kio] [Bug 353813] File System Browser freezes Kate when opening a file in a folder with thousands of files

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=353813

Nate Graham  changed:

   What|Removed |Added

 Resolution|--- |UPSTREAM
 Status|CONFIRMED   |RESOLVED

--- Comment #6 from Nate Graham  ---
#6  QMessageLogger::fatal (this=this@entry=0x7fffd70c5ba0,
msg=msg@entry=0x7ff994ac00b8 "The Wayland connection broke. Did the Wayland
compositor die?") at global/qlogging.cpp:893

This means that the compositor crashed. Due to a Qt issue, when this happens,
the app using it will crash too. KDE developers submitted a fix, but sadly it
was not merged. See https://codereview.qt-project.org/c/qt/qtwayland/+/308984.

Until we get better handling of this in Qt, the best we can do is debug why the
compositor crashed in the first place. So can you please get a backtrace of the
crash in kwin_wayland and then file a new bug report with it on kwin |
wayland-generic? Thanks!

You may be able to use the `coredumpctl` utility to retrieve the backtrace. See
https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports#Retrieving_a_backtrace_using_coredumpctl

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[frameworks-kio] [Bug 353813] File System Browser freezes Kate when opening a file in a folder with thousands of files

[Patrick Silva]

https://bugs.kde.org/show_bug.cgi?id=353813

Patrick Silva  changed:

   What|Removed |Added

 CC||bugsefor...@gmx.com

--- Comment #5 from Patrick Silva  ---
This bug persists :(

Operating System: Arch Linux 
KDE Plasma Version: 5.15.3
KDE Frameworks Version: 5.56.0
Qt Version: 5.12.2

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[frameworks-kio] [Bug 353813] File System Browser freezes Kate when opening a file in a folder with thousands of files

[Méven Car]

https://bugs.kde.org/show_bug.cgi?id=353813

--- Comment #4 from Méven Car  ---
The problem is more likely related to the lines in

void KDirOperator::setUrl(const QUrl &_newurl, bool clearforward)

d->openUrl(newurl);

And

bool KDirOperator::Private::openUrl(const QUrl , KDirLister::OpenUrlFlags
flags)
{
const bool result = KProtocolManager::supportsListing(url)
&& isSchemeSupported(url.scheme())
&& dirLister->openUrl(url, flags);


They call dirLister->openUrl which calls in the end
KCoreDirListerCache::listDir, which is a synchronous call, hence the freeze of
the UI during the IO.

About the crash, it happens under wayland (I haven't tried with X):

# dolphin // opens the dir with 25000 files
Using Wayland-EGL
qt.accessibility.core: Cannot create accessible child interface for object: 
PlacesView(0x55d684e6f100)  index:  15
Using the 'xdg-shell-v6' shell integration
The Wayland connection broke. Did the Wayland compositor die?

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[frameworks-kio] [Bug 353813] File System Browser freezes Kate when opening a file in a folder with thousands of files

[Méven Car]

https://bugs.kde.org/show_bug.cgi?id=353813

--- Comment #3 from Méven Car  ---
I believe this can be explained indeed by kdiroperator.cpp

In

void KDirOperator::setUrl(const QUrl &_newurl, bool clearforward)

[...]
KIO::StatJob *job = KIO::stat(newurl);
KJobWidgets::setWindow(job, this);
bool res = job->exec(); // <- The job is executed synchronously, main
thread is paused
[...]

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[frameworks-kio] [Bug 353813] File System Browser freezes Kate when opening a file in a folder with thousands of files

[Méven Car]

https://bugs.kde.org/show_bug.cgi?id=353813

Méven Car  changed:

   What|Removed |Added

 Status|REPORTED|CONFIRMED
 Ever confirmed|0   |1
 CC||meve...@gmail.com

--- Comment #2 from Méven Car  ---
I reproduced on a SSD drive with 25000 0 byte files.
Dolphin can even crashes.

python code to reproduce creating 25000 files:
for i in range(0, 25000):
open("file_%d" % i, "w")

When testing with kdeconnect (introducing slower IO) on a mounted phone in a
directory containing thousands of files, the issue is more severe.

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[frameworks-kio] [Bug 353813] File System Browser freezes Kate when opening a file in a folder with thousands of files

[Christoph Cullmann via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=353813

Christoph Cullmann  changed:

   What|Removed |Added

  Component|kfile   |general
   Assignee|pfeif...@kde.org|fa...@kde.org
 CC||kdelibs-b...@kde.org
Product|kio |frameworks-kio

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