This is probably a duplicate of 1728588 (which itself is marked as a duplicate of 1731911).
apport-retrace gives me this Xwayland stack trace:
(gdb) bt
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1 0x00007fce6a322f5d in __GI_abort () at abort.c:90
#2 0x0000558934f5713a in OsAbort () at ../../../../os/utils.c:1361
#3 0x0000558934f5cc53 in AbortServer () at ../../../../os/log.c:877
#4 0x0000558934f5da75 in FatalError (f=f@entry=0x558934f66fa6 "%s") at ../../../../os/log.c:1015
#5 0x0000558934de2e6c in xwl_log_handler (format=<optimized out>, args=<optimized out>) at ../../../../../hw/xwayland/xwayland.c:885
#6 0x00007fce6c7728ca in wl_log (fmt=<optimized out>) at ../src/wayland-util.c:406
#7 0x00007fce6c76e2d8 in display_handle_error (data=<optimized out>, display=0x558935d07e30, object=0x558935d0c300, code=0, message=<optimized out>)
at ../src/wayland-client.c:810
#8 0x00007fce69c60e18 in ffi_call_unix64 () at ../src/x86/unix64.S:76
#9 0x00007fce69c6087a in ffi_call (cif=cif@entry=0x7ffd318ba470, fn=<optimized out>, rvalue=<optimized out>, rvalue@entry=0x0,
avalue=avalue@entry=0x7ffd318ba540) at ../src/x86/ffi64.c:525
#10 0x00007fce6c771a1b in wl_closure_invoke (closure=<optimized out>, flags=<optimized out>, target=<optimized out>, opcode=0, data=<optimized out>)
at ../src/connection.c:935
#11 0x00007fce6c76e5b8 in dispatch_event (display=display@entry=0x558935d07e30, queue=<optimized out>) at ../src/wayland-client.c:1310
#12 0x00007fce6c76f847 in dispatch_queue (queue=0x558935d07ef8, display=0x558935d07e30) at ../src/wayland-client.c:1449
#13 wl_display_dispatch_queue_pending (display=0x558935d07e30, queue=0x558935d07ef8) at ../src/wayland-client.c:1698
#14 0x00007fce6c76f8cc in wl_display_dispatch_pending (display=<optimized out>) at ../src/wayland-client.c:1761
#15 0x0000558934de341b in xwl_read_events (xwl_screen=0x558935cffa40) at ../../../../../hw/xwayland/xwayland.c:598
#16 0x0000558934f54cb1 in ospoll_wait (ospoll=0x558935cf4a20, timeout=<optimized out>) at ../../../../os/ospoll.c:412
#17 0x0000558934f4dcbb in WaitForSomething (are_ready=<optimized out>) at ../../../../os/WaitFor.c:226
#18 0x0000558934f199f3 in Dispatch () at ../../../../dix/dispatch.c:422
#19 0x0000558934f1dc90 in dix_main (argc=11, argv=0x7ffd318bb4f8, envp=<optimized out>) at ../../../../dix/main.c:287
#20 0x00007fce6a30b1c1 in __libc_start_main (main=0x558934de2a60 <main>, argc=11, argv=0x7ffd318bb4f8, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7ffd318bb4e8) at ../csu/libc-start.c:308
#21 0x0000558934de2a9a in _start ()
This is probably a duplicate of 1728588 (which itself is marked as a duplicate of 1731911).
apport-retrace gives me this Xwayland stack trace:
(gdb) bt unix/sysv/ linux/raise. c:51 ./../os/ utils.c: 1361 ./../os/ log.c:877 0x558934f66fa6 "%s") at ../../. ./../os/ log.c:1015 ./../.. /hw/xwayland/ xwayland. c:885 wayland- util.c: 406 handle_ error (data=<optimized out>, display= 0x558935d07e30, object= 0x558935d0c300, code=0, message=<optimized out>) wayland- client. c:810 x86/unix64. S:76 entry=0x7ffd318 ba470, fn=<optimized out>, rvalue=<optimized out>, rvalue@entry=0x0, avalue@ entry=0x7ffd318 ba540) at ../src/ x86/ffi64. c:525 connection. c:935 display@ entry=0x558935d 07e30, queue=<optimized out>) at ../src/ wayland- client. c:1310 0x558935d07ef8, display= 0x558935d07e30) at ../src/ wayland- client. c:1449 dispatch_ queue_pending (display= 0x558935d07e30, queue=0x558935d 07ef8) at ../src/ wayland- client. c:1698 dispatch_ pending (display=<optimized out>) at ../src/ wayland- client. c:1761 0x558935cffa40) at ../../. ./../.. /hw/xwayland/ xwayland. c:598 0x558935cf4a20, timeout=<optimized out>) at ../../. ./../os/ ospoll. c:412 <optimized out>) at ../../. ./../os/ WaitFor. c:226 ./../dix/ dispatch. c:422 b4f8, envp=<optimized out>) at ../../. ./../dix/ main.c: 287 e2a60 <main>, argc=11, argv=0x7ffd318b b4f8, init=<optimized out>, fini=<optimized out>, fini=<optimized out>, stack_end= 0x7ffd318bb4e8) at ../csu/ libc-start. c:308
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/
#1 0x00007fce6a322f5d in __GI_abort () at abort.c:90
#2 0x0000558934f5713a in OsAbort () at ../../.
#3 0x0000558934f5cc53 in AbortServer () at ../../.
#4 0x0000558934f5da75 in FatalError (f=f@entry=
#5 0x0000558934de2e6c in xwl_log_handler (format=<optimized out>, args=<optimized out>) at ../../.
#6 0x00007fce6c7728ca in wl_log (fmt=<optimized out>) at ../src/
#7 0x00007fce6c76e2d8 in display_
at ../src/
#8 0x00007fce69c60e18 in ffi_call_unix64 () at ../src/
#9 0x00007fce69c6087a in ffi_call (cif=cif@
avalue=
#10 0x00007fce6c771a1b in wl_closure_invoke (closure=<optimized out>, flags=<optimized out>, target=<optimized out>, opcode=0, data=<optimized out>)
at ../src/
#11 0x00007fce6c76e5b8 in dispatch_event (display=
#12 0x00007fce6c76f847 in dispatch_queue (queue=
#13 wl_display_
#14 0x00007fce6c76f8cc in wl_display_
#15 0x0000558934de341b in xwl_read_events (xwl_screen=
#16 0x0000558934f54cb1 in ospoll_wait (ospoll=
#17 0x0000558934f4dcbb in WaitForSomething (are_ready=
#18 0x0000558934f199f3 in Dispatch () at ../../.
#19 0x0000558934f1dc90 in dix_main (argc=11, argv=0x7ffd318b
#20 0x00007fce6a30b1c1 in __libc_start_main (main=0x558934d
rtld_
#21 0x0000558934de2a9a in _start ()