Created attachment 1033209 [details]
File: backtrace

Created attachment 1033210 [details]
File: cgroup

Created attachment 1033211 [details]
File: core_backtrace

Created attachment 1033212 [details]
File: dso_list

Created attachment 1033213 [details]
File: environ

Created attachment 1033214 [details]
File: limits

Created attachment 1033215 [details]
File: maps

Created attachment 1033216 [details]
File: mountinfo

Created attachment 1033217 [details]
File: namespaces

Created attachment 1033218 [details]
File: open_fds

Created attachment 1033219 [details]
File: proc_pid_status

Created attachment 1033220 [details]
File: var_log_messages

So the crash happens at line 135 of the src/gcal-date-selector.c file:

    static void
    parse_entries (GcalDateSelector *selector)
    {
      [... snip ...]
      day = atoi (gtk_entry_get_text (GTK_ENTRY (priv->entries[DAY])));
      month = atoi (gtk_entry_get_text (GTK_ENTRY (priv->entries[MONTH])));
      year = atoi (gtk_entry_get_text (GTK_ENTRY (priv->entries[YEAR])));
      [... snip ...]
    }

That's the "year = ..." line above.

I've set a breakpoint on that line with gdb, and here's what I get:

    (gdb) p priv->entries[YEAR]
    $4 = 0x0
    (gdb) p priv->entries[MONTH]
    $5 = 0x9bb200 [GtkEntry]
    (gdb) p priv->entries[DAY]
    $6 = 0x9bb440 [GtkEntry]

So the year entry is pointing to NULL, which doesn't seem like the expected value. :)

Created attachment 1033378 [details]
Screenshot of the date editing dialog

This is a screenshot of the dialog I get when trying to add an event to my calendar.

Clearly, you can see that the year entry is empty.

This is what causes the crash, as soon as I do anything that closes the date-picker. (for example, select a date, or just click anywhere outside the date picker)

My locale is en_HK.utf8.

If I run GNOME Calendar as follows:

  $ LC_TIME=C gnome-calendar

Then everything works as expected. Same with:

  $ LC_TIME=en_US.utf8 gnome-calendar

However, with the en_HK.utf8 locale:

  $ LC_TIME=en_HK.utf8 gnome-calendar
  
  (gnome-calendar:8055): Gtk-CRITICAL **: gtk_label_set_text: assertion 'GTK_IS_LABEL (label)' failed
  
  (gnome-calendar:8055): Gtk-CRITICAL **: gtk_label_set_text: assertion 'GTK_IS_LABEL (label)' failed
  
  (gnome-calendar:8055): Gtk-CRITICAL **: gtk_entry_set_text: assertion 'GTK_IS_ENTRY (entry)' failed
  
  (gnome-calendar:8055): Gtk-CRITICAL **: gtk_entry_set_text: assertion 'GTK_IS_ENTRY (entry)' failed

Those critical warnings show up with this locale, indicating that something is wrong with some labels/entries, and then eventually, I get the attached screenshot, and the crash.

So here's what I think is happening.

At gcal-date-selector.c:236 there is this line:

  priv->mask = nl_langinfo (D_FMT);

When running with LC_TIME=C, priv->mask will point to the "%m/%d/%y" string.

The rest of the code in that same function tries to identify the order in which to show the day, month and year widgets for the user locale, based on that date mask.

When running with LC_TIME=C, that will end up being:

  (gdb) p priv->month_pos
  $1 = 0
  (gdb) p priv->day_pos
  $2 = 1
  (gdb) p priv->year_pos
  $3 = 2

When showing the entry widgets, the entry 0 will thus contain the month, the entry 1 will contain the day, and the entry 2 will contain the year.

However, when running with LC_TIME=en_HK.utf8, priv-mask will point to the "%A, %B %d, %Y" string.

As a result, we get:

  (gdb) p priv->month_pos
  $1 = 1
  (gdb) p priv->day_pos
  $2 = 2
  (gdb) p priv->year_pos
  $3 = 3

This is because there are two identifiers for the day in this locale (%A and %d), which bumps all values off by one.

When showing the entry widgets, the entry 0 will thus contain... well, nothing, as can be seen on my screenshot. :)

The entry 1 will contain the month, entry 2 the day.

And there's no entry for the year, because entries are only 0, 1 and 2, not 3, which explains why priv->entries[YEAR] is NULL, as shown in comment 13.

Closing this issue as it is old. If you still think that it exists - reopen please. Thanks!