and/or causes kstart5 to crash like this: kstart5 dolphin . Omitting both --window and --windowclass arguments is not recommended KCrash: crashing... crashRecursionCounter = 2 KCrash: Application Name = kstart5 path = /usr/bin pid = 7475 KCrash: Arguments: /usr/bin/kstart5 dolphin . KCrash: Attempting to start /usr/lib/drkonqi from kdeinit sock_file=/run/user/1000/kdeinit5__1 KDE Frameworks Version: 5.54 Qt Version: 5.12.1 ADDITIONAL INFORMATION Only on wayland
More logs: Application: KStart (kstart5), signal: Segmentation fault Using host libthread_db library "/usr/lib/libthread_db.so.1". [Current thread is 1 (Thread 0x7f5412b8a800 (LWP 16675))] Thread 2 (Thread 0x7f540f45e700 (LWP 16676)): #0 0x00007f54168bdc21 in poll () from /usr/lib/libc.so.6 #1 0x00007f541541f540 in ?? () from /usr/lib/libglib-2.0.so.0 #2 0x00007f541541f62e in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0 #3 0x00007f5416df0d04 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5 #4 0x00007f5416d99b2c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5 #5 0x00007f5416bdd569 in QThread::exec() () from /usr/lib/libQt5Core.so.5 #6 0x00007f5416691ba6 in ?? () from /usr/lib/libQt5DBus.so.5 #7 0x00007f5416bde96c in ?? () from /usr/lib/libQt5Core.so.5 #8 0x00007f5415e74a9d in start_thread () from /usr/lib/libpthread.so.0 #9 0x00007f54168c8b23 in clone () from /usr/lib/libc.so.6 Thread 1 (Thread 0x7f5412b8a800 (LWP 16675)): [KCrash Handler] #6 0x00007f54166600ce in xcb_send_request_with_fds64 () from /usr/lib/libxcb.so.1 #7 0x00007f541666066a in xcb_send_request () from /usr/lib/libxcb.so.1 #8 0x00007f5416666da5 in xcb_intern_atom () from /usr/lib/libxcb.so.1 #9 0x00007f5417922102 in ?? () from /usr/lib/libKF5WindowSystem.so.5 #10 0x00007f5417926aa7 in ?? () from /usr/lib/libKF5WindowSystem.so.5 #11 0x00007f5417928a12 in NETRootInfo::NETRootInfo(xcb_connection_t*, QFlags<NET::Property>, QFlags<NET::Property2>, int, bool) () from /usr/lib/libKF5WindowSystem.so.5 #12 0x000055b2ae5b2802 in ?? () #13 0x000055b2ae5b1541 in ?? () #14 0x00007f54167f1223 in __libc_start_main () from /usr/lib/libc.so.6 #15 0x000055b2ae5b1ace in _start () [Inferior 1 (process 16675) detached]
it crashes here too. Operating System: Arch Linux KDE Plasma Version: 5.15.2 KDE Frameworks Version: 5.55.0 Qt Version: 5.12.1
Please install debug symbols for libKF5WindowSystem and add an updated backtrace.
Created attachment 118666 [details] Backtrace after rebuilding kwindowsystem with debug option Is this any better?
Checking the sources, kstart not only requires X11, but also seems to be just a wrapper to run applications with the X11 startup notification info for those applications that don't provide their own. As such, I think this application cannot be ported to Wayland. I don't know if applications can itself request to run with Qt's xcb windowing backend. If not, you can manually start it with QT_QPA_PLATFORM=xcb kstart5 ... Crash caused by connection=0x0 Thread 1 (Thread 0x7f6921d1c800 (LWP 17822)): [KCrash Handler] #6 0x00007f69257f20ce in xcb_send_request_with_fds64 () from /usr/lib/libxcb.so.1 #7 0x00007f69257f266a in xcb_send_request () from /usr/lib/libxcb.so.1 #8 0x00007f69257f8da5 in xcb_intern_atom () from /usr/lib/libxcb.so.1 #9 0x00007f6926ab4132 in Atoms::init (this=this@entry=0x562cb3567260) at /usr/src/debug/kwindowsystem-5.56.0/src/platforms/xcb/netwm.cpp:304 #10 0x00007f6926ab8af7 in Atoms::Atoms (c=<optimized out>, this=0x562cb3567260) at /usr/src/debug/kwindowsystem-5.56.0/src/platforms/xcb/netwm.cpp:82 #11 atomsForConnection (c=<optimized out>, c@entry=0x0) at /usr/src/debug/kwindowsystem-5.56.0/src/platforms/xcb/netwm.cpp:68 #12 0x00007f6926abaa62 in NETRootInfo::NETRootInfo (this=0x7fff974a9f40, connection=0x0, properties=..., properties2=..., screen=-1, doActivate=<optimized out>) at /usr/src/debug/kwindowsystem-5.56.0/src/platforms/xcb/netwm.cpp:517
Created attachment 121360 [details] kstart5 fix wayland crash I confirm this issue exists with kde-cli-tools-5.16.2 Running on gentoo under plasma wayland 'kstart5 plasmashell' does crash with the same backtrace. I did a change following porting guide, patch attached, please have a look.
Git commit 88533ac66bf9fb89a823dbcf07a3b7b6dd0de2eb by Albert Astals Cid, on behalf of Igor Kovalenko. Committed on 07/07/2019 at 11:22. Pushed by aacid into branch 'Plasma/5.16'. fix kstart5 crash on wayland Make kstart query NETRootInfo only if it is running on QX11Info::isPlatformX11 following porting guidelines. Verified by starting just crashed plasmashell via 'kstart5 plasmashell' M +9 -1 kstart/kstart.cpp https://commits.kde.org/kde-cli-tools/88533ac66bf9fb89a823dbcf07a3b7b6dd0de2eb