Details from address sanitizer:

Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]: AddressSanitizer:DEADLYSIGNAL
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]: 
=================================================================
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]: ==11918==ERROR: 
AddressSanitizer: SEGV on unknown address 0x000000000006 (pc 0x7f58b1ab7c7d bp 
0x000000000002 sp 0x7ffd3aad4da0 T0)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]: ==11918==The signal is caused 
by a READ memory access.
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]: ==11918==Hint: address points 
to the zero page.
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #0 0x7f58b1ab7c7c in 
g_slice_alloc (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x6fc7c)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #1 0x7f58b1abc687 in 
g_string_sized_new (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x74687)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #2 0x7f58b1a9baef  
(/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x53aef)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #3 0x7f58b1a9e01a in 
g_markup_parse_context_parse (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x5601a)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #4 0x7f58b22f1bdd  
(/lib/x86_64-linux-gnu/libgtk-3.so.0+0x13abdd)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #5 0x7f58b22ebd50 in 
gtk_builder_add_from_resource (/lib/x86_64-linux-gnu/libgtk-3.so.0+0x134d50)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #6 0x7f58b22ef2eb in 
gtk_builder_new_from_resource (/lib/x86_64-linux-gnu/libgtk-3.so.0+0x1382eb)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #7 0x7f58b22d5c9f  
(/lib/x86_64-linux-gnu/libgtk-3.so.0+0x11ec9f)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #8 0x7f58b1b87de2 in 
g_cclosure_marshal_VOID__OBJECTv 
(/lib/x86_64-linux-gnu/libgobject-2.0.so.0+0x17de2)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #9 0x7f58b1b84935  
(/lib/x86_64-linux-gnu/libgobject-2.0.so.0+0x14935)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #10 0x7f58b1ba136b in 
g_signal_emit_valist (/lib/x86_64-linux-gnu/libgobject-2.0.so.0+0x3136b)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #11 0x7f58b1ba19b2 in 
g_signal_emit (/lib/x86_64-linux-gnu/libgobject-2.0.so.0+0x319b2)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #12 0x7f58b2565e57 in 
gtk_window_set_application (/lib/x86_64-linux-gnu/libgtk-3.so.0+0x3aee57)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #13 0x7f58b1b8a710  
(/lib/x86_64-linux-gnu/libgobject-2.0.so.0+0x1a710)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #14 0x7f58b1b8c277 in 
g_object_new_valist (/lib/x86_64-linux-gnu/libgobject-2.0.so.0+0x1c277)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #15 0x7f58b1b8c5cc in 
g_object_new (/lib/x86_64-linux-gnu/libgobject-2.0.so.0+0x1c5cc)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #16 0x56047418a910 in 
gcal_application_activate ../src/gui/gcal-application.c:385
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #17 0x7f58b1b84935  
(/lib/x86_64-linux-gnu/libgobject-2.0.so.0+0x14935)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #18 0x7f58b1ba136b in 
g_signal_emit_valist (/lib/x86_64-linux-gnu/libgobject-2.0.so.0+0x3136b)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #19 0x7f58b1ba1fa8 in 
g_signal_emit_by_name (/lib/x86_64-linux-gnu/libgobject-2.0.so.0+0x31fa8)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #20 0x7f58b1cb0bbc  
(/lib/x86_64-linux-gnu/libgio-2.0.so.0+0xe1bbc)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #21 0x7f58b1cda053  
(/lib/x86_64-linux-gnu/libgio-2.0.so.0+0x10b053)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #22 0x7f58b1a9972d in 
g_main_context_dispatch (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x5172d)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #23 0x7f58b1a99adf  
(/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x51adf)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #24 0x7f58b1a99b82 in 
g_main_context_iteration (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x51b82)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #25 0x7f58b1caea64 in 
g_application_run (/lib/x86_64-linux-gnu/libgio-2.0.so.0+0xdfa64)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #26 0x56047418881f in main 
../src/main.c:40
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #27 0x7f58b15aa1e2 in 
__libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x271e2)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]:     #28 0x56047418460d in 
_start (/usr/bin/gnome-calendar+0x5360d)
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]: AddressSanitizer can not 
provide additional info.
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]: SUMMARY: AddressSanitizer: 
SEGV (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x6fc7c) in g_slice_alloc
Oct 03 11:46:38 pop-os org.gnome.Calendar[3834]: ==11918==ABORTING

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-calendar in Ubuntu.
https://bugs.launchpad.net/bugs/1846541

Title:
  sigsegv in gtk_widget_get_scale_factor

Status in gnome-calendar package in Ubuntu:
  New

Bug description:
  Occasionally when launching the calendar from the overview, it
  segfaults at startup. This does not seem to happen when launched from
  the terminal. Logs from journald:

  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:51 pop-os kernel: gnome-calendar[8992]: segfault at 1 ip 
00007f289e26bc7d sp 00007ffce534fa60 error 4 in 
libglib-2.0.so.0.6200.0[7f289e218000+83000]

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