Invoking kdialog causes a crash in KDE. For example when saving a file from Chrome the save dialog crashes and simply running the following command results in a crash: kdialog -title="Save File" --getsavefilename /tmp The crash report shows: Application: kdialog (kdialog), signal: Segmentation fault Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185 [Current thread is 1 (Thread 0x7fdcf05d4940 (LWP 10373))] Thread 3 (Thread 0x7fdcec886700 (LWP 10375)): [KCrash Handler] #6 0x00007fdcfe9cace7 in QObject::disconnect(QObject const*, char const*, QObject const*, char const*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #7 0x00007fdd01c42c50 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5 #8 0x00007fdd01c2f816 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5 #9 0x00007fdcfe7ceb48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #10 0x00007fdcf9f686ba in start_thread (arg=0x7fdcec886700) at pthread_create.c:333 #11 0x00007fdcfe0db82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 Thread 2 (Thread 0x7fdcee1e1700 (LWP 10374)): #0 0x00007fdcfe0cfb5d in poll () at ../sysdeps/unix/syscall-template.S:84 #1 0x00007fdcfb519c62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1 #2 0x00007fdcfb51b8d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1 #3 0x00007fdcf0112d79 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5 #4 0x00007fdcfe7ceb48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #5 0x00007fdcf9f686ba in start_thread (arg=0x7fdcee1e1700) at pthread_create.c:333 #6 0x00007fdcfe0db82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 Thread 1 (Thread 0x7fdcf05d4940 (LWP 10373)): #0 pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185 #1 0x00007fdcfe7cf9fb in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #2 0x00007fdcfe7ce6f6 in QThread::wait(unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #3 0x00007fdd01c2f5a6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5 #4 0x00007fdd01c2f639 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5 #5 0x00007fdcfe00eff8 in __run_exit_handlers (status=1, listp=0x7fdcfe3985f8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true) at exit.c:82 #6 0x00007fdcfe00f045 in __GI_exit (status=<optimized out>) at exit.c:104 #7 0x00007fdcfe7df06e in QCommandLineParser::process(QStringList const&) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #8 0x000000000040c4a0 in ?? () #9 0x00007fdcfdff5830 in __libc_start_main (main=0x409f30, argc=4, argv=0x7fff8aa257d8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff8aa257c8) at ../csu/libc-start.c:291 #10 0x0000000000410159 in _start () This maybe is related to https://bugs.kde.org/show_bug.cgi?id=372239
For the record I have updated KDE Neon with qt 5.7.1 and plasma 5.9
It should not crash (and does not here with Qt 5.8.0). But the correct option is --title instead of -title
Interesting, if I use the correct --title parameter it does not crash. But if I use the wrong one -title it does crash. I will close this issue but I believe a crash due to an invalid input parameter is a bug.
Crash is in Qt library.
*** Bug 376347 has been marked as a duplicate of this bug. ***
*** Bug 377616 has been marked as a duplicate of this bug. ***
Does anyone know which Qt commit this was fixed in? I have the crash with Qt 5.8.0, but not if I use the 5.8 branch from git, though this would require rebuilding all Qt libraries.
I have similar issue with slightly different stacktrace, attached.
Created attachment 105099 [details] My crash details
I just verified that there's an issue with kdialog version 17.04.1 (in KDE Neon). kdialog will crash when it's passed either the "--version" or "-v" flag. Unfortunately, the fact that the "--version" flag causes kdialog to crash is a big issue for Google Chrome and Chromium. Both of those apps call kdialog with the "--version" flag right before the first time that they try to display a KDE "Save" dialog (when running within KDE Plasma). After kdialog crashes, Chrome or Chromium become unresponsive for a very long time. Here's a couple of examples of the output on the command line: micron@gnr:~$ /usr/bin/kdialog -v Invalid Context= "stock" line for icon theme: "/usr/share/icons/Colorsubuntu-mono-light/stock/16/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/Colorsubuntu-mono-light/stock/22/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/Colorsubuntu-mono-light/stock/24/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/Colorsubuntu-mono-light/stock/32/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/Colorsubuntu-mono-light/stock/48/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/Colorsubuntu-mono-light/stock/64/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/Colorsubuntu-mono-light/stock/128/" Icon theme "ubuntu-mono-light" not found. Icon theme "Adwaita" not found. kdialog 1.0 KCrash: crashing... crashRecursionCounter = 2 KCrash: Application Name = kdialog path = /usr/bin pid = 23472 KCrash: Arguments: /usr/bin/kdialog -v KCrash: Attempting to start /usr/lib/x86_64-linux-gnu/libexec/drkonqi from kdeinit sock_file=/run/user/1000/kdeinit5__0 [1]+ Stopped /usr/bin/kdialog -v micron@gnr:~$ micron@gnr:~$ /usr/bin/kdialog --version Invalid Context= "stock" line for icon theme: "/usr/share/icons/Colorsubuntu-mono-light/stock/16/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/Colorsubuntu-mono-light/stock/22/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/Colorsubuntu-mono-light/stock/24/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/Colorsubuntu-mono-light/stock/32/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/Colorsubuntu-mono-light/stock/48/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/Colorsubuntu-mono-light/stock/64/" Invalid Context= "stock" line for icon theme: "/usr/share/icons/Colorsubuntu-mono-light/stock/128/" Icon theme "ubuntu-mono-light" not found. Icon theme "Adwaita" not found. kdialog 1.0 KCrash: crashing... crashRecursionCounter = 2 KCrash: Application Name = kdialog path = /usr/bin pid = 23624 KCrash: Arguments: /usr/bin/kdialog --version KCrash: Attempting to start /usr/lib/x86_64-linux-gnu/libexec/drkonqi from kdeinit sock_file=/run/user/1000/kdeinit5__0 [2]+ Stopped /usr/bin/kdialog --version
Read comment #2 and comment #4.
https://bugreports.qt.io/browse/QTBUG-52988
Please backport the fix for Qt 5.7.1. Because KDE Neon LTS User Edition still has this bug.