Can you try to run partition manager with

KPMCORE_DEBUG=y partitionmanager

and see at what stage exactly it crashes.

Also it might be useful to have backtrace with debug symbols... But let's get output with KPMCORE_DEBUG=y first.

Hello Andrius Štikonas, KDE Partition Manager seems to crash when it's scanning for devices and scans /dev/sdb which is my external hard drive. Below is the output for KPMCORE_DEBUG=y partitionmanager.

Could not load plugin for core backend  "" :  "The shared library was not found."
Loaded backend plugin:  "pmsfdiskbackendplugin"
"Command: /usr/sbin/dumpe2fs "
"Command: /usr/sbin/e2label "
"Command: /usr/sbin/mkfs.ext2 "
"Command: /usr/sbin/e2fsck -V"
"Command: /usr/sbin/tune2fs "
"Command: /usr/sbin/resize2fs "
"Command: /usr/sbin/dumpe2fs "
"Command: /usr/sbin/e2label "
"Command: /usr/sbin/mkfs.ext2 "
"Command: /usr/sbin/e2fsck -V"
"Command: /usr/sbin/tune2fs "
"Command: /usr/sbin/resize2fs "
"Command: /usr/sbin/dumpe2fs "
"Command: /usr/sbin/e2label "
"Command: /usr/sbin/mkfs.ext2 "
"Command: /usr/sbin/e2fsck -V"
"Command: /usr/sbin/tune2fs "
"Command: /usr/sbin/resize2fs "
"Command: /usr/sbin/mkswap "
"Command: /usr/sbin/mkfs.fat "
"Command: /usr/sbin/fatlabel "
"Command: /usr/sbin/mkfs.fat "
"Command: /usr/sbin/fatlabel "
"Command: /usr/sbin/ntfsresize "
"Command: /usr/sbin/ntfslabel "
"Command: /usr/sbin/mkfs.ntfs "
"Command: /usr/sbin/ntfsclone "
"Command: /usr/sbin/cryptsetup "
"Command: /usr/sbin/cryptsetup "
"Command: /usr/sbin/mkfs.fat "
"Command: /usr/sbin/fatlabel "
"Command: /usr/sbin/fsck.minix "
"Command: /usr/sbin/mkfs.minix "
"Using backend plugin: pmsfdiskbackendplugin (1)"
"Scanning devices..."
"Command: lsblk --nodeps --paths --sort name --json --output type,name"
"Command: blockdev --getsize64 /dev/loop9"
"Command: blockdev --getss /dev/loop9"
"Command: sfdisk --json /dev/loop9"
"Command: lsblk --nodeps --noheadings --output model /dev/loop9"
"Command: lsblk --nodeps --noheadings --output kname /dev/loop9"
"Command: lsblk --nodeps --noheadings --output tran /dev/loop9"
"Device found: loop9"
"Command: smartctl --all --json /dev/loop9"
smartctl initialization failed for  "/dev/loop9" :  No such file or directory
error during smart output parsing for  "/dev/loop9" :  No such file or directory
"Command: udevadm info --query=property /dev/loop9p1"
"Command: lsblk --noheadings --nodeps --output mountpoint /dev/loop9p1"
"Command: udevadm info --query=property /dev/loop9p2"
"Command: lsblk --noheadings --nodeps --output mountpoint /dev/loop9p2"
"Command: udevadm info --query=property /dev/loop9p3"
"Command: lsblk --noheadings --nodeps --output mountpoint /dev/loop9p3"
"Command: udevadm info --query=property /dev/loop9p4"
"Command: lsblk --noheadings --nodeps --output mountpoint /dev/loop9p4"
"Partition ‘/dev/loop9p1’ is not properly aligned (first sector: 1,920,221,984, modulo: 800)."
"Command: blockdev --getsize64 /dev/sda"
"Partition ‘/dev/loop9p1’ is not properly aligned (last sector: 3,736,432,267, modulo: 1,676)."
"Partition ‘/dev/loop9p2’ is not properly aligned (first sector: 1,936,028,192, modulo: 544)."
"Partition ‘/dev/loop9p2’ is not properly aligned (last sector: 3,889,681,299, modulo: 916)."
"Command: blockdev --getss /dev/sda"
"Partition ‘/dev/loop9p4’ is not properly aligned (first sector: 27,722,122, modulo: 394)."
"Partition ‘/dev/loop9p4’ is not properly aligned (last sector: 27,722,568, modulo: 841)."
"Command: sfdisk --json /dev/sda"
"Command: lsblk --nodeps --noheadings --output model /dev/sda"
"Command: lsblk --nodeps --noheadings --output tran /dev/sda"
"Command: smartctl --all --json /dev/sda"
"Device found: Hitachi HDT721010SLA360"
smartctl initialization failed for  "/dev/sda" :  No such file or directory
error during smart output parsing for  "/dev/sda" :  No such file or directory
"Command: udevadm info --query=property /dev/sda1"
"Command: lsblk --noheadings --nodeps --output mountpoint /dev/sda1"
"Command: ntfsresize --info --force --no-progress-bar /dev/sda1"
"Command: udevadm info --query=property /dev/sda1"
"Command: udevadm info --query=property /dev/sda1"
"Command: udevadm info --query=property /dev/sda2"
"Command: lsblk --noheadings --nodeps --output mountpoint /dev/sda2"
"Command: ntfsresize --info --force --no-progress-bar /dev/sda2"
"Command: udevadm info --query=property /dev/sda2"
"Command: udevadm info --query=property /dev/sda2"
"Command: udevadm info --query=property /dev/sda3"
"Command: lsblk --noheadings --nodeps --output mountpoint /dev/sda3"
"Command: ntfsresize --info --force --no-progress-bar /dev/sda3"
"Command: udevadm info --query=property /dev/sda3"
"Command: udevadm info --query=property /dev/sda3"
"Command: udevadm info --query=property /dev/sda4"
unknown file system type  ""  on  "/dev/sda4"
"Command: lsblk --noheadings --nodeps --output mountpoint /dev/sda4"
"Command: udevadm info --query=property /dev/sda5"
"Command: lsblk --noheadings --nodeps --output mountpoint /dev/sda5"
"Command: udevadm info --query=property /dev/sda5"
"Command: udevadm info --query=property /dev/sda5"
"Command: udevadm info --query=property /dev/sda6"
"Command: lsblk --noheadings --nodeps --output mountpoint /dev/sda6"
"Command: udevadm info --query=property /dev/sda6"
"Command: udevadm info --query=property /dev/sda6"
"Partition ‘/dev/sda4’ is not properly aligned (first sector: 1,537,028,094, modulo: 2,046)."
"Command: blockdev --getsize64 /dev/sdb"
"Command: blockdev --getss /dev/sdb"
"Command: sfdisk --json /dev/sdb"
"Command: lsblk --nodeps --noheadings --output model /dev/sdb"
"Command: lsblk --nodeps --noheadings --output tran /dev/sdb"
"Device found: TOSHIBA MK5076GS"
"Command: smartctl --all --json /dev/sdb"
smartctl initialization failed for  "/dev/sdb" :  No such file or directory
error during smart output parsing for  "/dev/sdb" :  No such file or directory
"Command: udevadm info --query=property /dev/sdb1"
"Command: lsblk --noheadings --nodeps --output mountpoint /dev/sdb1"
"Command: lvm vgs --foreign --readonly --noheadings --units B --nosuffix --options vg_name"
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = partitionmanager path = /usr/bin pid = 19642
KCrash: Arguments: /usr/bin/partitionmanager 
KCrash: Attempting to start /usr/lib/x86_64-linux-gnu/libexec/drkonqi from kdeinit
sock_file=/run/user/1000/kdeinit5__0

[1]+  Stopped                 KPMCORE_DEBUG=y partitionmanager

Hmm, last command it runs is scanning for LVM.
By the way, do you happpen to use LVM? LVM scanning is run even if you don't use it (partitionmanager needs to check if you use LVM or not)

And what happens if you manually run

sudo lvm vgs --foreign --readonly --noheadings --units B --nosuffix --options vg_name

Hello Andrius Štikonas, the output of sudo lvm vgs --foreign --readonly --noheadings --units B --nosuffix --options vg_name is sudo: lvm: command not found.

After installing the lvm2 package KDE Partition Manager still crashes, and the output of sudo lvm vgs --foreign --readonly --noheadings --units B --nosuffix --options vg_name is:

/dev/sdc: open failed: No medium found
/dev/sdd: open failed: No medium found
/dev/sde: open failed: No medium found
/dev/sdc: open failed: No medium found
/dev/sdd: open failed: No medium found
/dev/sde: open failed: No medium found

Perhaps LVM was red herring.

Maybe Partition Manager chokes on those "/dev/sdc: open failed: No medium found"

Do these device nodes (sdc, sdd and sde) disappear when you unplug your external media? And does KDE Partition Manager crash in that case?

Hello, those devices are not from the external hard drive but they are from some card (SD, etc) readers built into my PC.

(In reply to Bartek Wreczycki from comment #7)
> Hello, those devices are not from the external hard drive but they are from
> some card (SD, etc) readers built into my PC.

Hmm, I think I have some removable SD card reader which shows extra devices and it doesn't cause crash.

Maybe let's try to get a better backtrace and see if it helps.

Can you try installing at least libkpmcore9-dbgsym and partitionmanager-dbgsym
and get a new backtrace. (Installing debug symbols for more libraries in particular Qt will make backtrace even more complete...). At the moment I can only see function names in the backtrace, with debug symbols it will hopefully show where exactly crash happens.

I actually had some backtraces with PartWidget::paintEvent function before in other bugs, but I can't really see anything wrong with that function and I was never able to reliably reproduce crash that crashed in paintEvent.

By the way, that function is here https://invent.kde.org/kde/kpmcore/-/blob/master/src/gui/partwidget.cpp#L91

Hello, below is the backtrace with the packages libkpmcore9-dbgsym and andpartitionmanager-dbgsym installed.

Application: KDE Partition Manager (partitionmanager), signal: Floating point exception
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fcc5c680800 (LWP 37027))]

Thread 11 (Thread 0x7fcc45dac700 (LWP 37037)):
#0  0x00007fcc5fa1a96f in __GI___poll (fds=0x55b9154df170, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fcc5e6ed1ae in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fcc5e6ed533 in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fcc5057ae9a in  () at /lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fcc5e716931 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fcc5ef34609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fcc5fa27103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7fcc465ad700 (LWP 37036)):
#0  0x00007fcc5e73a33d in g_mutex_lock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fcc5e6ec5cb in g_main_context_prepare () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fcc5e6ed0db in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fcc5e6ed2e3 in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fcc5e6ed331 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fcc5e716931 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fcc5ef34609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007fcc5fa27103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7fcc46dae700 (LWP 37035)):
#0  0x00007fcc5fa1a96f in __GI___poll (fds=0x7fcc28004a20, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fcc5e6ed1ae in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fcc5e6ed2e3 in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fcc5ffb8583 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fcc5ff5f4db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fcc6178205f in DBusThread::run() (this=0x55b91540acf0) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qflags.h:120
#6  0x00007fcc5fd989d2 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fcc5ef34609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#8  0x00007fcc5fa27103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7fcc475af700 (LWP 37034)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55b915552bb8) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55b915552b68, cond=0x55b915552b90) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55b915552b90, mutex=0x55b915552b68) at pthread_cond_wait.c:638
#3  0x00007fcc525813db in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#4  0x00007fcc52580feb in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#5  0x00007fcc5ef34609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fcc5fa27103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7fcc47db0700 (LWP 37033)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55b915552bb8) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55b915552b68, cond=0x55b915552b90) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55b915552b90, mutex=0x55b915552b68) at pthread_cond_wait.c:638
#3  0x00007fcc525813db in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#4  0x00007fcc52580feb in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#5  0x00007fcc5ef34609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fcc5fa27103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fcc50f03700 (LWP 37032)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55b915552bb8) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55b915552b68, cond=0x55b915552b90) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55b915552b90, mutex=0x55b915552b68) at pthread_cond_wait.c:638
#3  0x00007fcc525813db in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#4  0x00007fcc52580feb in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#5  0x00007fcc5ef34609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fcc5fa27103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fcc51704700 (LWP 37031)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55b915552bb8) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55b915552b68, cond=0x55b915552b90) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55b915552b90, mutex=0x55b915552b68) at pthread_cond_wait.c:638
#3  0x00007fcc525813db in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#4  0x00007fcc52580feb in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#5  0x00007fcc5ef34609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fcc5fa27103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fcc52046700 (LWP 37030)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55b9158a9830) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55b9158a97e0, cond=0x55b9158a9808) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55b9158a9808, mutex=0x55b9158a97e0) at pthread_cond_wait.c:638
#3  0x00007fcc525813db in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#4  0x00007fcc52580feb in  () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#5  0x00007fcc5ef34609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fcc5fa27103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fcc59e91700 (LWP 37029)):
#0  0x00007fcc5fa1a96f in __GI___poll (fds=0x7fcc4c01a670, nfds=1, timeout=863936367) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fcc5e6ed1ae in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fcc5e6ed2e3 in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fcc5ffb8583 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fcc5ff5f4db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fcc5fd97785 in QThread::exec() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fcc5f805efa in  () at /lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007fcc5fd989d2 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fcc5ef34609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007fcc5fa27103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fcc5b7cd700 (LWP 37028)):
#0  0x00007fcc5fa1a96f in __GI___poll (fds=0x7fcc5b7ccca8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fcc5e629c1a in  () at /lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fcc5e62b90a in xcb_wait_for_event () at /lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fcc5bfcc298 in  () at /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fcc5fd989d2 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fcc5ef34609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fcc5fa27103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fcc5c680800 (LWP 37027)):
[KCrash Handler]
#6  0x00007fcc6178d4e5 in PartWidget::paintEvent(QPaintEvent*) (this=0x55b91559c950) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qrect.h:184
#7  0x00007fcc609bb2b6 in QWidget::event(QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#8  0x00007fcc60978a66 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#9  0x00007fcc609820f0 in QApplication::notify(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#10 0x00007fcc5ff6093a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007fcc609b3f4a in QWidgetPrivate::sendPaintEvent(QRegion const&) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#12 0x00007fcc609b4799 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#13 0x00007fcc609b5423 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#14 0x00007fcc609b44a4 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007fcc609b5423 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007fcc609b44a4 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007fcc609b5423 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007fcc609b5306 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007fcc609b5306 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#20 0x00007fcc609b44a4 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#21 0x00007fcc6098abfc in  () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#22 0x00007fcc6098adc1 in  () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007fcc609a3385 in QWidgetPrivate::syncBackingStore() () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007fcc609bbcac in QWidget::event(QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#25 0x00007fcc60ad0148 in QMainWindow::event(QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#26 0x00007fcc614d19ab in KMainWindow::event(QEvent*) () at /lib/x86_64-linux-gnu/libKF5XmlGui.so.5
#27 0x00007fcc6151c5bb in KXmlGuiWindow::event(QEvent*) () at /lib/x86_64-linux-gnu/libKF5XmlGui.so.5
#28 0x00007fcc60978a66 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#29 0x00007fcc609820f0 in QApplication::notify(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#30 0x00007fcc5ff6093a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00007fcc6098be53 in  () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#32 0x00007fcc6098cdb0 in  () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#33 0x00007fcc609a5231 in QWidget::repaint(QRect const&) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#34 0x00007fcc609a52a0 in QWidget::repaint() () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#35 0x00007fcc6178d93a in PartWidget::setFileSystemColorCode(std::vector<QColor, std::allocator<QColor> > const&) (this=<optimized out>, colorCode=...) at ./src/gui/partwidget.cpp:77
#36 0x000055b91456f09b in PartTableWidget::setPartitionTable(PartitionTable const*) (this=0x55b9155424c0, ptable=<optimized out>) at ./src/gui/parttablewidget.cpp:56
#37 0x000055b914565d91 in PartitionManagerWidget::updatePartitions() (this=0x55b91530c5f0) at ./src/gui/partitionmanagerwidget.h:121
#38 0x000055b914566179 in PartitionManagerWidget::updatePartitions() (this=<optimized out>) at ./src/gui/partitionmanagerwidget.h:85
#39 PartitionManagerWidget::setSelectedPartition(Partition const*) (this=<optimized out>, p=<optimized out>) at ./src/gui/partitionmanagerwidget.cpp:170
#40 0x0000000000000000 in  ()
[Inferior 1 (process 37027) detached]

Hmm,

/usr/include/x86_64-linux-gnu/qt5/QtCore/qrect.h

suggest that something is wrong with calls to QRect.

I still don't see what might be going wrong there... Maybe I'll have to ask somebody else to take a look, to get a second pair of eyes...

Can you test latest kpmcore master code?

One check was added to test if partition capacity is non-zero before dividing by partition capacity:

https://invent.kde.org/kde/kpmcore/-/commit/cacdb7b634fa8fbe15cb98cc6f5b17fd6a122a9c

Hello, I require some assistance with compiling kpmcore, I always get this output:

Installing in /usr/local. Run /home/bartek/kpmcore/build/prefix.sh to set the environment for kpmcore.
-- Could NOT find KF5Auth (missing: KF5Auth_DIR)
-- Could NOT find KF5Auth: found neither KF5AuthConfig.cmake nor kf5auth-config.cmake 
-- Could NOT find KF5CoreAddons (missing: KF5CoreAddons_DIR)
-- Could NOT find KF5CoreAddons: found neither KF5CoreAddonsConfig.cmake nor kf5coreaddons-config.cmake 
-- Could NOT find KF5I18n (missing: KF5I18n_DIR)
-- Could NOT find KF5I18n: found neither KF5I18nConfig.cmake nor kf5i18n-config.cmake 
-- Could NOT find KF5WidgetsAddons (missing: KF5WidgetsAddons_DIR)
-- Could NOT find KF5WidgetsAddons: found neither KF5WidgetsAddonsConfig.cmake nor kf5widgetsaddons-config.cmake 
CMake Error at /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:146 (message):
  Could NOT find KF5 (missing: Auth CoreAddons I18n WidgetsAddons) (Required
  is at least version "5.56")
Call Stack (most recent call first):
  /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:393 (_FPHSA_FAILURE_MESSAGE)
  /usr/share/ECM/find-modules/FindKF5.cmake:110 (find_package_handle_standard_args)
  CMakeLists.txt:67 (find_package)

(In reply to Bartek Wreczycki from comment #12)
> Hello, I require some assistance with compiling kpmcore, I always get this
> output:
> 
> Installing in /usr/local. Run /home/bartek/kpmcore/build/prefix.sh to set
> the environment for kpmcore.
> -- Could NOT find KF5Auth (missing: KF5Auth_DIR)
> -- Could NOT find KF5Auth: found neither KF5AuthConfig.cmake nor
> kf5auth-config.cmake 
> -- Could NOT find KF5CoreAddons (missing: KF5CoreAddons_DIR)
> -- Could NOT find KF5CoreAddons: found neither KF5CoreAddonsConfig.cmake nor
> kf5coreaddons-config.cmake 
> -- Could NOT find KF5I18n (missing: KF5I18n_DIR)
> -- Could NOT find KF5I18n: found neither KF5I18nConfig.cmake nor
> kf5i18n-config.cmake 
> -- Could NOT find KF5WidgetsAddons (missing: KF5WidgetsAddons_DIR)
> -- Could NOT find KF5WidgetsAddons: found neither
> KF5WidgetsAddonsConfig.cmake nor kf5widgetsaddons-config.cmake 
> CMake Error at
> /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:146
> (message):
>   Could NOT find KF5 (missing: Auth CoreAddons I18n WidgetsAddons) (Required
>   is at least version "5.56")
> Call Stack (most recent call first):
>   /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:393
> (_FPHSA_FAILURE_MESSAGE)
>   /usr/share/ECM/find-modules/FindKF5.cmake:110
> (find_package_handle_standard_args)
>   CMakeLists.txt:67 (find_package)

You are missing build dependencies.

Try running sudo apt-get build-dep kpmcore

(In reply to Bartek Wreczycki from comment #12)
> Hello, I require some assistance with compiling kpmcore, I always get this
> output:
> 
> Installing in /usr/local. Run /home/bartek/kpmcore/build/prefix.sh to set
> the environment for kpmcore.
> -- Could NOT find KF5Auth (missing: KF5Auth_DIR)
> -- Could NOT find KF5Auth: found neither KF5AuthConfig.cmake nor
> kf5auth-config.cmake 
> -- Could NOT find KF5CoreAddons (missing: KF5CoreAddons_DIR)
> -- Could NOT find KF5CoreAddons: found neither KF5CoreAddonsConfig.cmake nor
> kf5coreaddons-config.cmake 
> -- Could NOT find KF5I18n (missing: KF5I18n_DIR)
> -- Could NOT find KF5I18n: found neither KF5I18nConfig.cmake nor
> kf5i18n-config.cmake 
> -- Could NOT find KF5WidgetsAddons (missing: KF5WidgetsAddons_DIR)
> -- Could NOT find KF5WidgetsAddons: found neither
> KF5WidgetsAddonsConfig.cmake nor kf5widgetsaddons-config.cmake 
> CMake Error at
> /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:146
> (message):
>   Could NOT find KF5 (missing: Auth CoreAddons I18n WidgetsAddons) (Required
>   is at least version "5.56")
> Call Stack (most recent call first):
>   /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:393
> (_FPHSA_FAILURE_MESSAGE)
>   /usr/share/ECM/find-modules/FindKF5.cmake:110
> (find_package_handle_standard_args)
>   CMakeLists.txt:67 (find_package)

Also, I'm not sure if installing to /usr/local would work, polkit (which is used by kauth) might not like files installed in non-standard location.

I usually just install to /usr with 
"cmake .. -DINSTALL_PREFIX=/usr"

(it's a bit ugly since it has pottential to  polute your /usr, although, now master installs the same version of libraries as 4.1.0, so it should just overwrite your system install of kpmcore)

Created attachment 128437 [details]
New crash information added by DrKonqi

partitionmanager (4.1.0) using Qt 5.12.8

I can not get into KDE partition manager either. It recently started crashing immediately after entering my password.

-- Backtrace (Reduced):
#6  0x00007f043ba5f4e5 in PartWidget::paintEvent(QPaintEvent*) () from /lib/x86_64-linux-gnu/libkpmcore.so.9
#7  0x00007f043ac8d2b6 in QWidget::event(QEvent*) () from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#8  0x00007f043ac4aa66 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#9  0x00007f043ac540f0 in QApplication::notify(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#10 0x00007f043a23293a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt5Core.so.5

(In reply to trwantare from comment #15)
> Created attachment 128437 [details]
> New crash information added by DrKonqi
> 
> partitionmanager (4.1.0) using Qt 5.12.8
> 
> I can not get into KDE partition manager either. It recently started
> crashing immediately after entering my password.
> 
> -- Backtrace (Reduced):
> #6  0x00007f043ba5f4e5 in PartWidget::paintEvent(QPaintEvent*) () from
> /lib/x86_64-linux-gnu/libkpmcore.so.9
> #7  0x00007f043ac8d2b6 in QWidget::event(QEvent*) () from
> /lib/x86_64-linux-gnu/libQt5Widgets.so.5
> #8  0x00007f043ac4aa66 in QApplicationPrivate::notify_helper(QObject*,
> QEvent*) () from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
> #9  0x00007f043ac540f0 in QApplication::notify(QObject*, QEvent*) () from
> /lib/x86_64-linux-gnu/libQt5Widgets.so.5
> #10 0x00007f043a23293a in QCoreApplication::notifyInternal2(QObject*,
> QEvent*) () from /lib/x86_64-linux-gnu/libQt5Core.so.5

Hi,

Unfortunately, this backtrace is not useful.

I have committed a few fixes to paintEvent function that might or might not fix the crash. Would you be able to compile kpmcore from git master and test them?

Alternatively, it would be useful to have a backtrace with debug symbols AND compiler optimizations disabled.

I just got kpmcore github.com/KDE/kpmcore and went through the process of building from source. I'm not sure I'm running it correctly though because ./kpmcore_external command in /usr/local/lib/kauth/libexec doesn't do anything.

(In reply to Titus Rwantare from comment #17)
> I just got kpmcore github.com/KDE/kpmcore and went through the process of
> building from source. I'm not sure I'm running it correctly though because
> ./kpmcore_external command in /usr/local/lib/kauth/libexec doesn't do
> anything.

That's probably because you installed it to /usr/local. Polkit expects its helpers to be installed in /usr (I think for security reasons). By the way, you shouldn't run kpmcore_external manually in any case. kpmcore is library that spawns kpmcore_external command helper but you use kpmcore via KDE Partition Manager or some other program like Calamares

I get the following error if I try to run partitionmanager

partitionmanager: symbol lookup error: partitionmanager: undefined symbol: _ZN9FSFeatureD1Ev

(In reply to Titus Rwantare from comment #19)
> I get the following error if I try to run partitionmanager
> 
> partitionmanager: symbol lookup error: partitionmanager: undefined symbol:
> _ZN9FSFeatureD1Ev

It looks like you also need to rebuild partitionmanager.

It appears to be functioning correctly after installing partitionmanager from source.

(In reply to Titus Rwantare from comment #21)
> It appears to be functioning correctly after installing partitionmanager
> from source.

Would it be possible for you to compile kpmcore 4.1.0 from source to confirm that it crashes.

If you mean the latest source on kde/kpmcore master, then no, it doesn't crash with that version. However, removing partitionmanager and kpmcore, and reinstalling through apt, which is versioned 4.1.0 also, the apt version insta crashes. I've gone back and forth between the two.

(In reply to Titus Rwantare from comment #23)
> If you mean the latest source on kde/kpmcore master, then no, it doesn't
> crash with that version. However, removing partitionmanager and kpmcore, and
> reinstalling through apt, which is versioned 4.1.0 also, the apt version
> insta crashes. I've gone back and forth between the two.

Sorry, I meant uninstalling apt version and compiling 4.1.0 (not from latest git version but from "git checkout v4.1.0") to make sure that the fix is between 4.1.0 and master. As opposed to some other factors.

(In reply to Andrius Štikonas from comment #24)
> 
> Sorry, I meant uninstalling apt version and compiling 4.1.0 (not from latest
> git version but from "git checkout v4.1.0") to make sure that the fix is
> between 4.1.0 and master. As opposed to some other factors.

I've just tried this and yes, 4.1.0 crashes and master does not. Both from source

(In reply to Titus Rwantare from comment #25)
> (In reply to Andrius Štikonas from comment #24)
> > 
> > Sorry, I meant uninstalling apt version and compiling 4.1.0 (not from latest
> > git version but from "git checkout v4.1.0") to make sure that the fix is
> > between 4.1.0 and master. As opposed to some other factors.
> 
> I've just tried this and yes, 4.1.0 crashes and master does not. Both from
> source

Ok, so hopefully the speculative fix works. I'll close this and other bugs with similar backtrace as fixed. If it still crashes for somebody, then please reopen (or file a new bug).

*** Bug 422331 has been marked as a duplicate of this bug. ***