Started kontact normally in kwin_wayland terminal output: Using Wayland-EGL WebEngine compiled with X11 support, however qpa backend is not xcb. This may fail. [7504:7531:0614/132938.621037:ERROR:gl_surface_qt.cpp(230)] eglGetProcAddress not found. No text-to-speech plug-ins were found. Using the 'xdg-shell-v6' shell integration [7504:7531:0614/132939.874890:ERROR:gl_surface_qt.cpp(299)] Requested OpenGL implementation is not supported. Implementation: 0 Received signal 11 SEGV_MAPERR 000000000000 #0 0x7fbb541a91cf <unknown> #1 0x7fbb52bcce17 <unknown> #2 0x7fbb541a96de <unknown> #3 0x7fbb630ad4b0 <unknown> #4 0x7fbb52c37e42 <unknown> #5 0x7fbb52c220e8 <unknown> #6 0x7fbb54c68a8d <unknown> #7 0x7fbb56cdd927 <unknown> #8 0x7fbb56ce08f0 <unknown> #9 0x7fbb56cdbe16 <unknown> #10 0x7fbb56cd9adf <unknown> #11 0x7fbb56cdb022 <unknown> #12 0x7fbb56cdcbbd <unknown> #13 0x7fbb541a98d9 <unknown> #14 0x7fbb541cada0 <unknown> #15 0x7fbb541cb7fd <unknown> #16 0x7fbb541cbae7 <unknown> #17 0x7fbb541c7679 <unknown> #18 0x7fbb541edbcf <unknown> #19 0x7fbb5420f71f <unknown> #20 0x7fbb5420ad80 <unknown> #21 0x7fbb5eed26ba start_thread #22 0x7fbb6317f41d clone r8: 0000000000000000 r9: 0000000000000001 r10: 0000000000000080 r11: 0000000000000000 r12: 00007fbb097f8ad0 r13: 0000000000000000 r14: 00007fbac400afb0 r15: 00007fbb097f8ce0 di: 0000000000000000 si: 0000000000000000 bp: 00007fbb097f8ab0 bx: 00007fbac40165c0 dx: 0000000000000000 ax: 00007fbb592aa138 cx: 00007fbb097f88d0 sp: 00007fbb097f88d0 ip: 00007fbb52c37e42 efl: 0000000000010246 cgf: 002b000000000033 erf: 0000000000000004 trp: 000000000000000e msk: 0000000000000000 cr2: 0000000000000000 [end of stack trace] Calling _exit(1). Core file will not be generated.
Looks related - https://bugs.kde.org/show_bug.cgi?id=395678
indeed *** This bug has been marked as a duplicate of bug 395678 ***