bug#55672: 29.0.50; Emacs crashes when calling start-process-shell-command xdg-open with process-connection-type set to nil

[Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Ihor Radchenko <yantar92@gmail.com> writes:

> (gdb) up 6
> #6 0x00007ffff6c7dcfe in cairo_xcb_surface_create () from /usr/lib64/libcairo.so.2
> (gdb) up
> #7 0x00005555556fb83b in x_begin_cr_clip (f=0x555556c49ce0, gc=0x0) at xterm.c:4681
> 4681 surface = cairo_xcb_surface_create (FRAME_DISPLAY_INFO (f)->xcb_connection,
> (gdb) p *f->output_data.x
> $1 = {
>   toolbar_top_height = 0,
>   toolbar_bottom_height = 0,
>   toolbar_left_width = 0,
>   toolbar_right_width = 0,
>   border_tile = 6291486,
>   normal_gc = 0x55555703f7e0,
>   reverse_gc = 0x55555979fc40,
>   cursor_gc = 0x5555589f9450,
>   window_desc = 6291481,
>   draw_desc = 6291482,
>   picture = 0,
>   need_buffer_flip = true,
>   icon_desc = 0,
>   parent_desc = 14713974,
>   user_time_window = 6291481,
>   icon_bitmap = 1,
>   font = 0x5555561057b0,
>   baseline_offset = 0,
>   fontset = 2,
>   cursor_pixel = 4278190080,
>   border_pixel = 4278190080,
>   mouse_pixel = 4278190080,
>   cursor_foreground_pixel = 4294967295,
>   scroll_bar_foreground_pixel = 18446744073709551615,
>   scroll_bar_background_pixel = 18446744073709551615,
>   text_cursor = 6291466,
>   nontext_cursor = 6291467,
>   modeline_cursor = 6291469,
>   hand_cursor = 6291470,
>   hourglass_cursor = 6291468,
>   horizontal_drag_cursor = 6291471,
>   vertical_drag_cursor = 6291472,
>   current_cursor = 6291466,
>   left_edge_cursor = 6291473,
>   top_left_corner_cursor = 6291474,
>   top_edge_cursor = 6291475,
>   top_right_corner_cursor = 6291476,
>   right_edge_cursor = 6291477,
>   bottom_right_corner_cursor = 6291478,
>   bottom_edge_cursor = 6291479,
>   bottom_left_corner_cursor = 6291480,
>   hourglass_window = 0,
>   wm_hints = {
>     flags = 39,
>     input = 1,
>     initial_state = 1,
>     icon_pixmap = 6291488,
>     icon_window = 0,
> --Type <RET> for more, q to quit, c to continue without paging--c
>     icon_x = 0,
>     icon_y = 0,
>     icon_mask = 6291490,
>     window_group = 0
>   },
>   display_info = 0x5555562d7980,
>   saved_menu_event = 0x0,
>   hourglass_p = false,
>   explicit_parent = false,
>   asked_for_visible = true,
>   has_been_visible = true,
>   wait_for_wm = true,
>   alpha_identical_p = true,
>   xic = 0x55555c4c79f0,
>   xic_style = 1032,
>   xic_xfs = 0x0,
>   basic_frame_counter = 6291492,
>   extended_frame_counter = 0,
>   pending_basic_counter_value = {
>     hi = 0,
>     lo = 0
>   },
>   current_extended_counter_value = {
>     hi = 0,
>     lo = 0
>   },
>   sync_end_pending_p = false,
>   ext_sync_end_pending_p = false,
>   black_relief = {
>     gc = 0x0,
>     pixel = 18446744073709551615
>   },
>   white_relief = {
>     gc = 0x0,
>     pixel = 18446744073709551615
>   },
>   relief_background = 0,
>   focus_state = 0,
>   move_offset_top = 0,
>   move_offset_left = 0,
>   cr_context = 0x0,
>   cr_surface_desired_width = 674,
>   cr_surface_desired_height = 593,
>   preedit_size = 0,
>   preedit_chars = 0x0,
>   preedit_active = false,
>   preedit_caret = 0,
>   xi_masks = 0x555556bafc90,
>   num_xi_masks = 2
> }
> (gdb) 

Hmm, thanks.  I will look into this, but the bug seems not to be related
to GC creation, but rather something in Cairo.