If I start lazarus-qt5-2.0.10_1 (installed from packages) under sway (Wayland) and FreeBSD 13 with i915 KMS drivers, lazarus fails to start with an exception (before any window appears): $ lazarus [FORMS.PP] ExceptionOccurred Sender=EAccessViolation Exception=Access violation Stack trace: $000000000044F43C $00007FFFFFFFF003 $0000000000572469 $00000000006FCAC8 $00000000006FC45A $00000000006F807C $0000000000600B99 $0000000000600A9F $000000000048D83A [FORMS.PP] ExceptionOccurred If I force Lazarus to use the X11 backend with the following command, Lazarus works fine, so the error is very likely related to the Wayland backend: $ QT_QPA_PLATFORM=xcb lazarus
Some notes: - kwin_wayland (from x11-wm/plasma5-kwin) and https://github.com/unrelentingtech/weston are affected as well - setting XDG_CURRENT_DESKTOP=GNOME via environ(7) launches lazarus via QT_QPA_PLATFORM=xcb (Xwayland) - lazarus-qt5 built WITH_DEBUG=1 shows better stacktrace - running from lldb/gdb hints at direct X11 calls that but (a) Xwayland maybe disabled (b) Xwayland -rootless relies on Wayland compositor for WM interop $ WAYLAND_DEBUG=1 lazarus [0.733] -> wl_display@1.get_registry(new id wl_registry@2) [0.805] -> wl_display@1.sync(new id wl_callback@3) [0.876] wl_display@1.delete_id(3) [0.885] wl_registry@2.global(1, "wl_shm", 1) [0.894] -> wl_registry@2.bind(1, "wl_shm", 1, new id [unknown]@4) [0.901] wl_registry@2.global(2, "wl_drm", 2) [0.907] wl_registry@2.global(3, "zwp_linux_dmabuf_v1", 3) [0.913] wl_registry@2.global(4, "wl_compositor", 4) [0.918] -> wl_registry@2.bind(4, "wl_compositor", 3, new id [unknown]@5) [0.924] wl_registry@2.global(5, "wl_subcompositor", 1) [0.929] -> wl_registry@2.bind(5, "wl_subcompositor", 1, new id [unknown]@6) [0.936] wl_registry@2.global(6, "wl_data_device_manager", 3) [0.942] -> wl_registry@2.bind(6, "wl_data_device_manager", 1, new id [unknown]@7) [0.948] wl_registry@2.global(7, "zwlr_gamma_control_manager_v1", 1) [0.953] wl_registry@2.global(8, "zxdg_output_manager_v1", 3) [0.960] -> wl_registry@2.bind(8, "zxdg_output_manager_v1", 3, new id [unknown]@8) [0.966] -> wl_display@1.sync(new id wl_callback@9) [0.970] wl_registry@2.global(9, "org_kde_kwin_idle", 1) [0.976] wl_registry@2.global(10, "zwp_idle_inhibit_manager_v1", 1) [0.982] wl_registry@2.global(11, "zwlr_layer_shell_v1", 4) [0.987] wl_registry@2.global(12, "xdg_wm_base", 2) [0.993] wl_registry@2.global(13, "zwp_tablet_manager_v2", 1) [0.999] -> wl_registry@2.bind(13, "zwp_tablet_manager_v2", 1, new id [unknown]@10) [1.007] wl_registry@2.global(14, "org_kde_kwin_server_decoration_manager", 1) [1.012] wl_registry@2.global(15, "zxdg_decoration_manager_v1", 1) [1.021] wl_registry@2.global(16, "zwp_relative_pointer_manager_v1", 1) [1.026] wl_registry@2.global(17, "zwp_pointer_constraints_v1", 1) [1.032] wl_registry@2.global(18, "wp_presentation", 1) [1.037] wl_registry@2.global(19, "zwlr_output_manager_v1", 2) [1.043] wl_registry@2.global(20, "zwlr_output_power_manager_v1", 1) [1.048] wl_registry@2.global(21, "zwp_input_method_manager_v2", 1) [1.053] wl_registry@2.global(22, "zwp_text_input_manager_v3", 1) [1.059] wl_registry@2.global(23, "zwlr_foreign_toplevel_manager_v1", 3) [1.064] wl_registry@2.global(24, "zwlr_export_dmabuf_manager_v1", 1) [1.070] wl_registry@2.global(25, "zwlr_screencopy_manager_v1", 3) [1.075] wl_registry@2.global(26, "zwlr_data_control_manager_v1", 2) [1.080] wl_registry@2.global(27, "zwp_primary_selection_device_manager_v1", 1) [1.086] -> wl_registry@2.bind(27, "zwp_primary_selection_device_manager_v1", 1, new id [unknown]@11) [1.093] wl_registry@2.global(28, "wp_viewporter", 1) [1.098] wl_registry@2.global(29, "zxdg_exporter_v1", 1) [1.104] wl_registry@2.global(30, "zxdg_importer_v1", 1) [1.109] wl_registry@2.global(31, "zxdg_exporter_v2", 1) [1.118] wl_registry@2.global(32, "zxdg_importer_v2", 1) [1.124] wl_registry@2.global(33, "zwp_virtual_keyboard_manager_v1", 1) [1.130] wl_registry@2.global(34, "zwlr_virtual_pointer_manager_v1", 2) [1.135] wl_registry@2.global(35, "zwlr_input_inhibit_manager_v1", 1) [1.140] wl_registry@2.global(36, "zwp_keyboard_shortcuts_inhibit_manager_v1", 1) [1.146] wl_registry@2.global(37, "wl_seat", 7) [1.151] -> wl_registry@2.bind(37, "wl_seat", 5, new id [unknown]@12) [1.159] -> wl_data_device_manager@7.get_data_device(new id wl_data_device@13, wl_seat@12) [1.164] -> zwp_primary_selection_device_manager_v1@11.get_device(new id zwp_primary_selection_device_v1@14, wl_seat@12) [1.170] -> zwp_tablet_manager_v2@10.get_tablet_seat(new id zwp_tablet_seat_v2@15, wl_seat@12) [1.175] wl_registry@2.global(38, "zwp_pointer_gestures_v1", 1) [1.180] wl_registry@2.global(39, "wl_output", 3) [1.187] -> wl_registry@2.bind(39, "wl_output", 2, new id [unknown]@16) [1.198] -> zxdg_output_manager_v1@8.get_xdg_output(new id zxdg_output_v1@17, wl_output@16) [1.203] wl_callback@3.done(12456) [1.252] wl_display@1.delete_id(9) [1.256] wl_shm@4.format(0) [1.259] wl_shm@4.format(1) [1.261] wl_shm@4.format(875709016) [1.263] wl_shm@4.format(875708993) [1.265] wl_callback@9.done(12456) [1.267] wl_seat@12.name("seat0") [1.269] wl_seat@12.capabilities(3) [1.277] -> wl_seat@12.get_keyboard(new id wl_keyboard@9) [1.282] -> wl_seat@12.get_pointer(new id wl_pointer@3) [1.285] wl_output@16.geometry(0, 0, 600, 340, 2, "Goldstar Company Ltd", "LG Ultra HD", 0) [1.295] wl_output@16.mode(1, 3840, 2160, 60000) [1.300] wl_output@16.scale(1) [1.303] wl_output@16.done() [1.329] zxdg_output_v1@17.name("DP-1") [1.333] zxdg_output_v1@17.description("Goldstar Company Ltd LG Ultra HD 0x0000C784 (DP-1)") [1.336] zxdg_output_v1@17.logical_position(0, 0) [1.339] zxdg_output_v1@17.logical_size(3840, 2160) [1.341] wl_output@16.done() [FORMS.PP] ExceptionOccurred Sender=EAccessViolation Exception=Access violation Stack trace: $000000000044F3FC $00007FFFFFFFF003 $0000000000572419 COLORTORGB, line 2531 of graphics.pp $00000000006FCA78 CREATEOBJECTS, line 2363 of qtobjects.pas $00000000006FC40A CREATE, line 2271 of qtobjects.pas $00000000006F802C QTDEFAULTCONTEXT, line 919 of qtobjects.pas $0000000000600B49 DESTROY, line 93 of qtobject.inc $0000000000600A4F CREATE, line 70 of qtobject.inc $000000000048D7FA CREATEWIDGETSET, line 2223 of forms.pp [FORMS.PP] ExceptionOccurred $ (cd /usr/local/share/lazarus-* && lldb ./startlazarus) (lldb) run Process 48202 launching Process 48202 stopped * thread #1, name = 'startlazarus', stop reason = signal SIGBUS frame #0: 0x0000000801044516 libX11.so.6`_XInternAtom(dpy=0x00000008045a6600, name="_NET_WM_DESKTOP", onlyIfExists=1, psig=0x00007fffffffe830, pidx=0x00007fffffffe82c, pn=0x00007fffffffe828) at IntAtom.c:77:25 74 /* look in the cache first */ 75 if (!(atoms = dpy->atoms)) { 76 dpy->atoms = atoms = Xcalloc(1, sizeof(AtomTable)); -> 77 dpy->free_funcs->atoms = _XFreeAtomTable; 78 } 79 sig = 0; 80 for (s1 = (char *)name; (c = *s1++); ) (lldb) bt * thread #1, name = 'startlazarus', stop reason = signal SIGBUS * frame #0: 0x0000000801044516 libX11.so.6`_XInternAtom(dpy=0x00000008045a6600, name="_NET_WM_DESKTOP", onlyIfExists=1, psig=0x00007fffffffe830, pidx=0x00007fffffffe82c, pn=0x00007fffffffe828) at IntAtom.c:77:25 frame #1: 0x0000000801044339 libX11.so.6`XInternAtom(dpy=0x00000008045a6600, name="_NET_WM_DESKTOP", onlyIfExists=1) at IntAtom.c:176:17 frame #2: 0x00000000006c5d90 startlazarus`XLIB_$$_XINTERNATOM$PDISPLAY$PCHAR$BOOLEAN$$QWORD + 16 frame #3: 0x0000000000600044 startlazarus`GETWINDOWMANAGER at qtx11.inc:208:13 frame #4: 0x00000000006008dd startlazarus`CREATE(this=0x000000080452dd10, vmt=0x0000000000000001) at qtobject.inc:58:51 frame #5: 0x000000000048d7fa startlazarus`CREATEWIDGETSET(AWIDGETSETCLASS=0x0000000000bc7a60) at forms.pp:2223:31 frame #6: 0x0000000000454b13 startlazarus`INTERFACES_$$_init$ at interfaces.pp:36:31 frame #7: 0x0000000000440932 startlazarus`fpc_initializeunits + 98 frame #8: 0x0000000000423212 startlazarus`main at startlazarus.lpr:45:1 (lldb) f 3 frame #3: 0x0000000000600044 startlazarus`GETWINDOWMANAGER at qtx11.inc:208:13 201 Display := QX11Info_display(); 202 203 if Display = nil then 204 exit; 205 206 ScreenNum := QX11Info_appScreen(); 207 RootWin := XRootWindow(Display, ScreenNum); -> 208 WMAtom := XInternAtom(Display,'_NET_WM_DESKTOP', True); 209 210 if WMAtom > 0 then 211 begin 212 WMAtom := XInternAtom(Display,'_NET_SUPPORTING_WM_CHECK', False); 213 if WMAtom > 0 then 214 begin 215 data := nil; (lldb) f 4 frame #4: 0x00000000006008dd startlazarus`CREATE(this=0x000000080452dd10, vmt=0x0000000000000001) at qtobject.inc:58:51 53 FAppActive := False; 54 {$IFDEF HASX11} 55 SavedHintHandlesList := TFPList.Create; 56 FMinimizedByPager := False; 57 FLastMinimizeEvent := 0; -> 58 FWindowManagerName := LowerCase(GetWindowManager); 59 // metacity wm forks. marco = mint mate wm, gnome shell = gnome 3 wm 60 if (FWindowManagerName = 'marco') or (FWindowManagerName = 'gnome shell') or 61 (UTF8Pos('mutter', FWindowManagerName) > 0) then 62 FWindowManagerName := 'metacity'; 63 {$ENDIF}
(In reply to Jan Beich from comment #1) > - setting XDG_CURRENT_DESKTOP=GNOME via environ(7) launches lazarus via QT_QPA_PLATFORM=xcb (Xwayland) Caused by https://codereview.qt-project.org/c/qt/qtbase/+/231227