Fvwm3 segfaults on xterm with short lifetime

[farblos]

Upfront Information

• Fvwm3 version (run: fvwm3 --version)

fvwm3 1.0.5 (released)
with support for:  ReadLine, XPM, PNG, SVG, Shape, XShm, SM, Bidi text, XRandR, XRender, XCursor, XFT, NLS

fvwm3 comes with NO WARRANTY, to the extent permitted by law. You may
redistribute copies of fvwm under the terms of the GNU General Public License.
For more information about these matters, see the file named COPYING.

• Linux distribution or BSD name/version

[~]$ cat /etc/debian_version 
bookworm/sid

• Platform (run: uname -sp)

[~]$ uname -sp
Linux unknown

Expected Behaviour

Executing xterm -e true does not crash Fvwm3.

Actual Behaviour

Executing xterm -e true crashes Fvwm3 rather frequently (4 out of 5 times).

Enabling logging

fvwm logging goes to the journal on my system. The relevant excerpt is:

Dec 25 18:40:29 sappc1 xsession[5682]: [1671990029.739298] setup_window_placement: Expanding screen from 'null' -> ''
Dec 25 18:40:29 sappc1 kernel: fvwm3[5679]: segfault at 19ffffffff ip 00007f3cbeb93cda sp 00007ffc7bfb9f80 error 4 in libc.so.6[7f3cbeb21000+155000]
Dec 25 18:40:29 sappc1 kernel: Code: ac 2e 10 00 e8 b7 63 fe ff 0f 1f 80 00 00 00 00 48 85 ff 0f 84 bf 00 00 00 55 48 8d 77 f0 53 48 83 ec 18 48 8b 1d 06 91 13 00 <48> 8b 47 f8 64 8b 2b a8 02 75 5b 48 8b 15 8c 90 13 00 64 48 83 3a
Dec 25 18:40:29 sappc1 lightdm[5675]: pam_unix(lightdm-autologin:session): session closed for user jschmidt
Dec 25 18:40:29 sappc1 systemd-logind[913]: Session 21 logged out. Waiting for processes to exit.

Steps to Reproduce

Execute below test case with following minimal .fvwm/config:

DestroyFunc StartFunction
AddToFunc StartFunction
+ I Module FvwmMFL
+ I Exec exec xterm -name testwindow

In the test window, execute xterm -e true until Fvwm3 crashes.

Does Fvwm3 crash?

Yes:

(gdb) bt
#0  0x00007f5a6766fcda in free () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f5a68504b69 in XFree (data=<optimized out>) at ../../src/XlibInt.c:1633
#2  0x000055dfb18b487a in AddWindow (ret_initial_map_command=ret_initial_map_command@entry=0x7ffe5322aee8, exc=<optimized out>, ReuseWin=ReuseWin@entry=0x0, win_opts=win_opts@entry=0x7ffe5322aef0) at ./fvwm/add_window.c:2609
#3  0x000055dfb1899c1d in HandleMapRequestKeepRaised (ea=0x7ffe5322af60, KeepRaised=0, ReuseWin=0x0, win_opts=0x7ffe5322aef0) at ./fvwm/events.c:3111
#4  0x000055dfb189be9b in dispatch_event (e=e@entry=0x7ffe5322afd0) at ./fvwm/events.c:4244
#5  0x000055dfb189bfb4 in HandleEvents () at ./fvwm/events.c:4290
#6  0x000055dfb1876610 in main (argc=<optimized out>, argv=<optimized out>) at ./fvwm/fvwm3.c:2523

Full:

#0  0x00007f5a6766fcda in free () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007f5a68504b69 in XFree (data=<optimized out>) at ../../src/XlibInt.c:1633
No locals.
#2  0x000055dfb18b487a in AddWindow (ret_initial_map_command=ret_initial_map_command@entry=0x7ffe5322aee8, exc=<optimized out>, ReuseWin=ReuseWin@entry=0x0, win_opts=win_opts@entry=0x7ffe5322aef0) at ./fvwm/add_window.c:2609
        nchildren = 21983
        parent = 94419258340720
        children = 0x1a00000007
        rc = 0
        fw = 0x55dfb25d7e80
        tmp = 0x55dfb25d7e80
        valuemask = 6144
        attributes = {background_pixmap = 0, background_pixel = 1769526526596, border_pixmap = 6292066, border_pixel = 12500670, bit_gravity = 0, win_gravity = 0, backing_store = 0, backing_planes = 0, backing_pixel = 16, save_under = 0, event_mask = 14811184, do_not_propagate_mask = 12, override_redirect = 64, colormap = 9, cursor = 6291469}
        wattr = {x = 658, y = 0, width = 644, height = 412, border_width = 1, depth = 24, visual = 0x55dfb25b6570, root = 1959, class = 1, bit_gravity = 1, win_gravity = 1, backing_store = 0, backing_planes = 4294967295, backing_pixel = 0, save_under = 0, colormap = 32, map_installed = 1, map_state = 0, all_event_masks = 6422579, your_event_mask = 0, do_not_propagate_mask = 0, override_redirect = 0, screen = 0x55dfb25a89e0}
        style = {next = 0x0, prev = 0x0, id = {name = 0x0, window_id = 0, flags = {has_name = 0, has_window_id = 0}}, icon_name = 0x0, mini_icon_name = 0x0, decor_name = 0x0, min_icon_width = 0 '\000', max_icon_width = 0 '\000', min_icon_height = 0 '\000', max_icon_height = 0 '\000', icon_resize_type = 0, icon_background_padding = 0 '\000', icon_background_relief = 0 '\000', icon_title_relief = 0 '\000', icon_font = 0x0, window_font = 0x0, fore_color_name = 0x55dfb25ce970 "lightgrey", back_color_name = 0x55dfb25cea10 "dimgrey", fore_color_name_hi = 0x55dfb25cec90 "black", back_color_name_hi = 0x55dfb25d18d0 "grey", colorset = 0, colorset_hi = 0, border_colorset = 0, border_colorset_hi = 0, icon_title_colorset = 0, icon_title_colorset_hi = 0, icon_background_colorset = 0, border_width = 0, handle_width = 0, layer = 0, start_desk = 0, start_page_x = 0, start_page_y = 0, start_screen = 0x0, min_window_width = 0, min_window_height = 0, max_window_width = 0, max_window_height = 0, min_window_width_is_c = false, min_window_height_is_c = false, max_window_width_is_c = false, max_window_height_is_c = false, shade_anim_steps = 0, snap_attraction = {proximity = 0, mode = 0, types = SNAP_NONE}, snap_grid_x = 0, snap_grid_y = 0, edge_delay_ms_move = 0, edge_delay_ms_resize = 0, edge_resistance_move = 0, edge_resistance_screen_move = 0, icon_boxes = 0x0, norm_placement_penalty = 0, pl_penalty = {normal = 1, ontop = 5, icon = 10, sticky = 1, below = 0.0500000007, strut = 50}, pl_percent_penalty = {p99 = 12, p95 = 6, p85 = 4, p75 = 1}, pl_position_string = 0x0, initial_map_command_string = 0x0, title_format_string = 0x0, icon_title_format_string = 0x0, flags = {common = {is_sticky_across_pages = 0, is_sticky_across_desks = 0, has_icon_font = 0, has_no_border = 0, has_window_font = 0, title_dir = 0, user_states = 0, s = {do_circulate_skip = 0, do_circulate_skip_icon = 0, do_circulate_skip_shaded = 0, do_ewmh_donate_icon = 0, do_ewmh_donate_mini_icon = 0, do_ewmh_ignore_state_hints = 0, do_ewmh_ignore_strut_hints = 0, do_ewmh_mini_icon_override = 0, do_ewmh_use_stacking_hints = 0, do_ewmh_ignore_window_type = 0, do_iconify_window_groups = 0, do_ignore_icon_boxes = 0, do_ignore_restack = 0, do_use_window_group_hint = 0, do_lower_transient = 1, do_not_show_on_map = 0, do_raise_transient = 1, do_resize_opaque = 0, do_shrink_windowshade = 0, do_stack_transient_parent = 1, do_window_list_skip = 0, ewmh_maximize_mode = 2, has_depressable_border = 0, has_mwm_border = 0, has_mwm_buttons = 0, has_mwm_override = 0, has_no_icon_title = 0, has_override_size = 0, has_stippled_title = 0, has_stippled_icon_title = 0, has_no_sticky_stippled_title = 0, has_no_sticky_stippled_icon_title = 0, icon_override = 0, is_bottom_title_rotated = 0, is_fixed = 0, is_fixed_ppos = 0, is_uniconifiable = 0, is_unmaximizable = 0, is_unclosable = 0, is_maximize_fixed_size_disallowed = 0, is_icon_sticky_across_pages = 0, is_icon_sticky_across_desks = 0, is_icon_suppressed = 0, is_left_title_rotated_cw = 0, is_lenient = 0, is_size_fixed = 0, is_psize_fixed = 0, is_right_title_rotated_cw = 1, is_top_title_rotated = 0, use_icon_position_hint = 1, use_indexed_window_name = 0, use_indexed_icon_name = 0, windowshade_laziness = 0, use_title_decor_rotation = 1, focus_policy = {do_raise_focused_click = {client = 0, decor = 0, icon = 0}, do_raise_unfocused_click = {client = 0, decor = 0, icon = 0}, do_focus_click = {client = 0, decor = 0, icon = 0}, do_focus_enter = 1, do_unfocus_leave = 1, do_focus_by_program = 1, do_focus_by_function = 1, do_warp_pointer_on_focus_func = 1, is_lenient = 0, use_mouse_buttons = 7, use_modifiers = 0, do_pass_focus_click = 1, do_pass_raise_click = 1, do_ignore_focus_click_motion = 0, do_ignore_raise_click_motion = 0, do_allow_func_focus_click = 0, do_allow_func_raise_click = 0, do_open_grabs_focus = 0, do_open_grabs_focus_transient = 1, do_override_grab_focus = 0, do_close_releases_focus = 0, do_close_releases_focus_transient = 1, do_override_release_focus = 0, do_sort_windowlist_by = 0}}}, do_decorate_transient = 0, placement_mode = 5, ewmh_placement_mode = 2, ws_cr_motion_method = 0, do_save_under = 0, do_start_iconic = 0, do_start_lowered = 0, do_start_shaded = 0, start_shaded_dir = 0, has_border_width = 0, has_color_back = 1, has_color_fore = 1, has_color_back_hi = 1, has_color_fore_hi = 1, has_decor = 0, has_edge_delay_ms_move = 0, has_edge_delay_ms_resize = 0, has_edge_resistance_move = 0, has_edge_resistance_screen_move = 0, has_handle_width = 0, has_icon = 0, has_icon_boxes = 0, has_icon_size_limits = 0, has_min_window_size = 0, has_max_window_size = 0, has_icon_background_padding = 0, has_icon_background_relief = 0, has_icon_title_relief = 0, has_window_shade_steps = 0, has_mini_icon = 0, has_mwm_decor = 0, has_mwm_functions = 0, has_no_handles = 0, has_no_title = 0, has_ol_decor = 0, has_snap_grid = 0, has_snap_attraction = 0, is_button_disabled = 0, is_unmanaged = 0, use_backing_store = 0, use_parent_relative = 0, use_colorset = 0, use_colorset_hi = 0, use_border_colorset = 0, use_border_colorset_hi = 0, use_icon_title_colorset = 0, use_icon_title_colorset_hi = 0, use_icon_background_colorset = 0, use_layer = 0, use_no_pposition = 0, use_no_usposition = 0, use_no_transient_pposition = 0, use_no_transient_usposition = 0, use_start_on_desk = 0, use_start_on_page_for_transient = 0, use_start_on_screen = 0, manual_placement_honors_starts_on_page = 0, um_placement_honors_starts_on_page = 0, capture_honors_starts_on_page = 1, recapture_honors_starts_on_page = 0, has_placement_penalty = 0, has_placement_percentage_penalty = 0, has_placement_position_string = 0, has_initial_map_command_string = 0, has_title_format_string = 0, has_icon_title_format_string = 0, initial_placement_done = 1}, flag_default = {common = {is_sticky_across_pages = 0, is_sticky_across_desks = 0, has_icon_font = 0, has_no_border = 0, has_window_font = 0, title_dir = 0, user_states = 0, s = {do_circulate_skip = 0, do_circulate_skip_icon = 0, do_circulate_skip_shaded = 0, do_ewmh_donate_icon = 0, do_ewmh_donate_mini_icon = 0, do_ewmh_ignore_state_hints = 0, do_ewmh_ignore_strut_hints = 0, do_ewmh_mini_icon_override = 0, do_ewmh_use_stacking_hints = 0, do_ewmh_ignore_window_type = 0, do_iconify_window_groups = 0, do_ignore_icon_boxes = 0, do_ignore_restack = 0, do_use_window_group_hint = 0, do_lower_transient = 0, do_not_show_on_map = 0, do_raise_transient = 0, do_resize_opaque = 0, do_shrink_windowshade = 0, do_stack_transient_parent = 0, do_window_list_skip = 0, ewmh_maximize_mode = 0, has_depressable_border = 0, has_mwm_border = 0, has_mwm_buttons = 0, has_mwm_override = 0, has_no_icon_title = 0, has_override_size = 0, has_stippled_title = 0, has_stippled_icon_title = 0, has_no_sticky_stippled_title = 0, has_no_sticky_stippled_icon_title = 0, icon_override = 0, is_bottom_title_rotated = 0, is_fixed = 0, is_fixed_ppos = 0, is_uniconifiable = 0, is_unmaximizable = 0, is_unclosable = 0, is_maximize_fixed_size_disallowed = 0, is_icon_sticky_across_pages = 0, is_icon_sticky_across_desks = 0, is_icon_suppressed = 0, is_left_title_rotated_cw = 0, is_lenient = 0, is_size_fixed = 0, is_psize_fixed = 0, is_right_title_rotated_cw = 0, is_top_title_rotated = 0, use_icon_position_hint = 0, use_indexed_window_name = 0, use_indexed_icon_name = 0, windowshade_laziness = 0, use_title_decor_rotation = 0, focus_policy = {do_raise_focused_click = {client = 1, decor = 1, icon = 0}, do_raise_unfocused_click = {client = 1, decor = 1, icon = 0}, do_focus_click = {client = 0, decor = 0, icon = 0}, do_focus_enter = 0, do_unfocus_leave = 0, do_focus_by_program = 1, do_focus_by_function = 0, do_warp_pointer_on_focus_func = 1, is_lenient = 0, use_mouse_buttons = 0, use_modifiers = 0, do_pass_focus_click = 1, do_pass_raise_click = 1, do_ignore_focus_click_motion = 0, do_ignore_raise_click_motion = 0, do_allow_func_focus_click = 1, do_allow_func_raise_click = 1, do_open_grabs_focus = 1, do_open_grabs_focus_transient = 0, do_override_grab_focus = 0, do_close_releases_focus = 1, do_close_releases_focus_transient = 0, do_override_release_focus = 0, do_sort_windowlist_by = 1}}}, do_decorate_transient = 0, placement_mode = 0, ewmh_placement_mode = 0, ws_cr_motion_method = 0, do_save_under = 0, do_start_iconic = 0, do_start_lowered = 0, do_start_shaded = 0, start_shaded_dir = 0, has_border_width = 0, has_color_back = 0, has_color_fore = 0, has_color_back_hi = 0, has_color_fore_hi = 0, has_decor = 0, has_edge_delay_ms_move = 0, has_edge_delay_ms_resize = 0, has_edge_resistance_move = 0, has_edge_resistance_screen_move = 0, has_handle_width = 0, has_icon = 0, has_icon_boxes = 0, has_icon_size_limits = 0, has_min_window_size = 0, has_max_window_size = 0, has_icon_background_padding = 0, has_icon_background_relief = 0, has_icon_title_relief = 0, has_window_shade_steps = 0, has_mini_icon = 0, has_mwm_decor = 0, has_mwm_functions = 0, has_no_handles = 0, has_no_title = 0, has_ol_decor = 0, has_snap_grid = 0, has_snap_attraction = 0, is_button_disabled = 0, is_unmanaged = 0, use_backing_store = 0, use_parent_relative = 0, use_colorset = 0, use_colorset_hi = 0, use_border_colorset = 0, use_border_colorset_hi = 0, use_icon_title_colorset = 0, use_icon_title_colorset_hi = 0, use_icon_background_colorset = 0, use_layer = 0, use_no_pposition = 0, use_no_usposition = 0, use_no_transient_pposition = 0, use_no_transient_usposition = 0, use_start_on_desk = 0, use_start_on_page_for_transient = 0, use_start_on_screen = 0, manual_placement_honors_starts_on_page = 0, um_placement_honors_starts_on_page = 0, capture_honors_starts_on_page = 0, recapture_honors_starts_on_page = 0, has_placement_penalty = 0, has_placement_percentage_penalty = 0, has_placement_position_string = 0, has_initial_map_command_string = 0, has_title_format_string = 0, has_icon_title_format_string = 0, initial_placement_done = 0}, flag_mask = {common = {is_sticky_across_pages = 0, is_sticky_across_desks = 0, has_icon_font = 0, has_no_border = 0, has_window_font = 0, title_dir = 0, user_states = 0, s = {do_circulate_skip = 0, do_circulate_skip_icon = 0, do_circulate_skip_shaded = 0, do_ewmh_donate_icon = 0, do_ewmh_donate_mini_icon = 0, do_ewmh_ignore_state_hints = 0, do_ewmh_ignore_strut_hints = 0, do_ewmh_mini_icon_override = 0, do_ewmh_use_stacking_hints = 0, do_ewmh_ignore_window_type = 0, do_iconify_window_groups = 0, do_ignore_icon_boxes = 0, do_ignore_restack = 0, do_use_window_group_hint = 0, do_lower_transient = 1, do_not_show_on_map = 0, do_raise_transient = 1, do_resize_opaque = 0, do_shrink_windowshade = 0, do_stack_transient_parent = 1, do_window_list_skip = 0, ewmh_maximize_mode = 3, has_depressable_border = 0, has_mwm_border = 0, has_mwm_buttons = 0, has_mwm_override = 0, has_no_icon_title = 0, has_override_size = 0, has_stippled_title = 0, has_stippled_icon_title = 0, has_no_sticky_stippled_title = 0, has_no_sticky_stippled_icon_title = 0, icon_override = 0, is_bottom_title_rotated = 0, is_fixed = 0, is_fixed_ppos = 0, is_uniconifiable = 0, is_unmaximizable = 0, is_unclosable = 0, is_maximize_fixed_size_disallowed = 0, is_icon_sticky_across_pages = 0, is_icon_sticky_across_desks = 0, is_icon_suppressed = 0, is_left_title_rotated_cw = 0, is_lenient = 0, is_size_fixed = 0, is_psize_fixed = 0, is_right_title_rotated_cw = 1, is_top_title_rotated = 0, use_icon_position_hint = 1, use_indexed_window_name = 0, use_indexed_icon_name = 0, windowshade_laziness = 0, use_title_decor_rotation = 1, focus_policy = {do_raise_focused_click = {client = 0, decor = 0, icon = 0}, do_raise_unfocused_click = {client = 0, decor = 0, icon = 0}, do_focus_click = {client = 1, decor = 1, icon = 1}, do_focus_enter = 1, do_unfocus_leave = 1, do_focus_by_program = 0, do_focus_by_function = 1, do_warp_pointer_on_focus_func = 0, is_lenient = 0, use_mouse_buttons = 0, use_modifiers = 0, do_pass_focus_click = 0, do_pass_raise_click = 0, do_ignore_focus_click_motion = 0, do_ignore_raise_click_motion = 0, do_allow_func_focus_click = 0, do_allow_func_raise_click = 0, do_open_grabs_focus = 0, do_open_grabs_focus_transient = 0, do_override_grab_focus = 0, do_close_releases_focus = 0, do_close_releases_focus_transient = 0, do_override_release_focus = 0, do_sort_windowlist_by = 0}}}, do_decorate_transient = 0, placement_mode = 15, ewmh_placement_mode = 3, ws_cr_motion_method = 0, do_save_under = 0, do_start_iconic = 0, do_start_lowered = 0, do_start_shaded = 0, start_shaded_dir = 0, has_border_width = 0, has_color_back = 1, has_color_fore = 1, has_color_back_hi = 1, has_color_fore_hi = 1, has_decor = 0, has_edge_delay_ms_move = 0, has_edge_delay_ms_resize = 0, has_edge_resistance_move = 0, has_edge_resistance_screen_move = 0, has_handle_width = 0, has_icon = 0, has_icon_boxes = 0, has_icon_size_limits = 0, has_min_window_size = 0, has_max_window_size = 0, has_icon_background_padding = 0, has_icon_background_relief = 0, has_icon_title_relief = 0, has_window_shade_steps = 0, has_mini_icon = 0, has_mwm_decor = 0, has_mwm_functions = 0, has_no_handles = 0, has_no_title = 1, has_ol_decor = 0, has_snap_grid = 0, has_snap_attraction = 0, is_button_disabled = 0, is_unmanaged = 0, use_backing_store = 0, use_parent_relative = 0, use_colorset = 1, use_colorset_hi = 1, use_border_colorset = 0, use_border_colorset_hi = 0, use_icon_title_colorset = 0, use_icon_title_colorset_hi = 0, use_icon_background_colorset = 0, use_layer = 0, use_no_pposition = 0, use_no_usposition = 0, use_no_transient_pposition = 0, use_no_transient_usposition = 0, use_start_on_desk = 0, use_start_on_page_for_transient = 0, use_start_on_screen = 0, manual_placement_honors_starts_on_page = 0, um_placement_honors_starts_on_page = 0, capture_honors_starts_on_page = 0, recapture_honors_starts_on_page = 0, has_placement_penalty = 0, has_placement_percentage_penalty = 0, has_placement_position_string = 0, has_initial_map_command_string = 0, has_title_format_string = 0, has_icon_title_format_string = 0, initial_placement_done = 0}, change_mask = {common = {is_sticky_across_pages = 0, is_sticky_across_desks = 0, has_icon_font = 0, has_no_border = 0, has_window_font = 0, title_dir = 0, user_states = 0, s = {do_circulate_skip = 0, do_circulate_skip_icon = 0, do_circulate_skip_shaded = 0, do_ewmh_donate_icon = 0, do_ewmh_donate_mini_icon = 0, do_ewmh_ignore_state_hints = 0, do_ewmh_ignore_strut_hints = 0, do_ewmh_mini_icon_override = 0, do_ewmh_use_stacking_hints = 0, do_ewmh_ignore_window_type = 0, do_iconify_window_groups = 0, do_ignore_icon_boxes = 0, do_ignore_restack = 0, do_use_window_group_hint = 0, do_lower_transient = 0, do_not_show_on_map = 0, do_raise_transient = 0, do_resize_opaque = 0, do_shrink_windowshade = 0, do_stack_transient_parent = 0, do_window_list_skip = 0, ewmh_maximize_mode = 0, has_depressable_border = 0, has_mwm_border = 0, has_mwm_buttons = 0, has_mwm_override = 0, has_no_icon_title = 0, has_override_size = 0, has_stippled_title = 0, has_stippled_icon_title = 0, has_no_sticky_stippled_title = 0, has_no_sticky_stippled_icon_title = 0, icon_override = 0, is_bottom_title_rotated = 0, is_fixed = 0, is_fixed_ppos = 0, is_uniconifiable = 0, is_unmaximizable = 0, is_unclosable = 0, is_maximize_fixed_size_disallowed = 0, is_icon_sticky_across_pages = 0, is_icon_sticky_across_desks = 0, is_icon_suppressed = 0, is_left_title_rotated_cw = 0, is_lenient = 0, is_size_fixed = 0, is_psize_fixed = 0, is_right_title_rotated_cw = 0, is_top_title_rotated = 0, use_icon_position_hint = 0, use_indexed_window_name = 0, use_indexed_icon_name = 0, windowshade_laziness = 0, use_title_decor_rotation = 0, focus_policy = {do_raise_focused_click = {client = 0, decor = 0, icon = 0}, do_raise_unfocused_click = {client = 0, decor = 0, icon = 0}, do_focus_click = {client = 0, decor = 0, icon = 0}, do_focus_enter = 0, do_unfocus_leave = 0, do_focus_by_program = 0, do_focus_by_function = 0, do_warp_pointer_on_focus_func = 0, is_lenient = 0, use_mouse_buttons = 0, use_modifiers = 0, do_pass_focus_click = 0, do_pass_raise_click = 0, do_ignore_focus_click_motion = 0, do_ignore_raise_click_motion = 0, do_allow_func_focus_click = 0, do_allow_func_raise_click = 0, do_open_grabs_focus = 0, do_open_grabs_focus_transient = 0, do_override_grab_focus = 0, do_close_releases_focus = 0, do_close_releases_focus_transient = 0, do_override_release_focus = 0, do_sort_windowlist_by = 0}}}, do_decorate_transient = 0, placement_mode = 0, ewmh_placement_mode = 0, ws_cr_motion_method = 0, do_save_under = 0, do_start_iconic = 0, do_start_lowered = 0, do_start_shaded = 0, start_shaded_dir = 0, has_border_width = 0, has_color_back = 0, has_color_fore = 0, has_color_back_hi = 0, has_color_fore_hi = 0, has_decor = 0, has_edge_delay_ms_move = 0, has_edge_delay_ms_resize = 0, has_edge_resistance_move = 0, has_edge_resistance_screen_move = 0, has_handle_width = 0, has_icon = 0, has_icon_boxes = 0, has_icon_size_limits = 0, has_min_window_size = 0, has_max_window_size = 0, has_icon_background_padding = 0, has_icon_background_relief = 0, has_icon_title_relief = 0, has_window_shade_steps = 0, has_mini_icon = 0, has_mwm_decor = 0, has_mwm_functions = 0, has_no_handles = 0, has_no_title = 0, has_ol_decor = 0, has_snap_grid = 0, has_snap_attraction = 0, is_button_disabled = 0, is_unmanaged = 0, use_backing_store = 0, use_parent_relative = 0, use_colorset = 0, use_colorset_hi = 0, use_border_colorset = 0, use_border_colorset_hi = 0, use_icon_title_colorset = 0, use_icon_title_colorset_hi = 0, use_icon_background_colorset = 0, use_layer = 0, use_no_pposition = 0, use_no_usposition = 0, use_no_transient_pposition = 0, use_no_transient_usposition = 0, use_start_on_desk = 0, use_start_on_page_for_transient = 0, use_start_on_screen = 0, manual_placement_honors_starts_on_page = 0, um_placement_honors_starts_on_page = 0, capture_honors_starts_on_page = 0, recapture_honors_starts_on_page = 0, has_placement_penalty = 0, has_placement_percentage_penalty = 0, has_placement_position_string = 0, has_initial_map_command_string = 0, has_title_format_string = 0, has_icon_title_format_string = 0, initial_placement_done = 0}, has_style_changed = 0, has_title_format_string = 0, has_icon_title_format_string = 0}
        sflags = 0x7ffe5322a7a8
        buttons = 1023
        used_sm = <optimized out>
        do_resize_too = <optimized out>
        b = {top_left = {width = 7, height = 26}, bottom_right = {width = 7, height = 7}, total_size = {width = 14, height = 33}}
        mr_args = <optimized out>
        state_args = {shade_dir = 0, do_shade = 0, used_title_dir_for_shading = 0, do_max = 0}
        w = 10485774
        exc2 = <optimized out>
        ecc = {type = 0, x = {etrigger = 0x0, elast = 0x7ffe5322a660}, w = {fw = 0x0, w = 140728898420762, wcontext = 140728898420736}, m = {module = 0x1ab25dc6d0}}
        mon = <optimized out>
        __func__ = "AddWindow"
#3  0x000055dfb1899c1d in HandleMapRequestKeepRaised (ea=0x7ffe5322af60, KeepRaised=0, ReuseWin=0x0, win_opts=0x7ffe5322aef0) at ./fvwm/events.c:3111
        is_on_this_page = 0
        is_new_window = 0
        tmp = <optimized out>
        sf = <optimized out>
        win_opts_bak = {initial_state = 0, flags = {do_override_ppos = 0, is_iconified_by_parent = 0, is_menu = 0, use_initial_icon_xy = 0}, initial_icon_x = 0, initial_icon_y = 0, default_icon_x = 0, default_icon_y = 0}
        ew = 10485774
        fw = 0x0
        initial_map_command = 0x0
        m = 0x0
        __func__ = "HandleMapRequestKeepRaised"
#4  0x000055dfb189be9b in dispatch_event (e=e@entry=0x7ffe5322afd0) at ./fvwm/events.c:4244
        ea = {exc = 0x55dfb25dc040}
        ecc = {type = EXCT_EVENT, x = {etrigger = 0x7ffe5322afd0, elast = 0x0}, w = {fw = 0x0, w = 10485774, wcontext = 8}, m = {module = 0x7ffe5322afd0}}
        dummyw = 0
        w = <optimized out>
        fw = 0x0
        event_group = 0x55dfb25c12b0
        sce = <optimized out>
#5  0x000055dfb189bfb4 in HandleEvents () at ./fvwm/events.c:4290
        ev = {type = 20, xany = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, window = 1959}, xkey = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, window = 1959, root = 10485774, subwindow = 18446744073709551615, time = 223338299476, x = 2, y = 0, x_root = 8388639, y_root = 0, state = 0, keycode = 4, same_screen = 12}, xbutton = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, window = 1959, root = 10485774, subwindow = 18446744073709551615, time = 223338299476, x = 2, y = 0, x_root = 8388639, y_root = 0, state = 0, button = 4, same_screen = 12}, xmotion = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, window = 1959, root = 10485774, subwindow = 18446744073709551615, time = 223338299476, x = 2, y = 0, x_root = 8388639, y_root = 0, state = 0, is_hint = 4 '\004', same_screen = 12}, xcrossing = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, window = 1959, root = 10485774, subwindow = 18446744073709551615, time = 223338299476, x = 2, y = 0, x_root = 8388639, y_root = 0, mode = 0, detail = 4, same_screen = 12, focus = 0, state = 0}, xfocus = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, window = 1959, mode = 10485774, detail = 0}, xexpose = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, window = 1959, x = 10485774, y = 0, width = -1, height = -1, count = 84}, xgraphicsexpose = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, drawable = 1959, x = 10485774, y = 0, width = -1, height = -1, count = 84, major_code = 52, minor_code = 2}, xnoexpose = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, drawable = 1959, major_code = 10485774, minor_code = 0}, xvisibility = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, window = 1959, state = 10485774}, xcreatewindow = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, parent = 1959, window = 10485774, x = -1, y = -1, width = 84, height = 52, border_width = 2, override_redirect = 0}, xdestroywindow = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, event = 1959, window = 10485774}, xunmap = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, event = 1959, window = 10485774, from_configure = -1}, xmap = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, event = 1959, window = 10485774, override_redirect = -1}, xmaprequest = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, parent = 1959, window = 10485774}, xreparent = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, event = 1959, window = 10485774, parent = 18446744073709551615, x = 84, y = 52, override_redirect = 2}, xconfigure = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, event = 1959, window = 10485774, x = -1, y = -1, width = 84, height = 52, border_width = 2, above = 8388639, override_redirect = 0}, xgravity = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, event = 1959, window = 10485774, x = -1, y = -1}, xresizerequest = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, window = 1959, width = 10485774, height = 0}, xconfigurerequest = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, parent = 1959, window = 10485774, x = -1, y = -1, width = 84, height = 52, border_width = 2, above = 8388639, detail = 0, value_mask = 12}, xcirculate = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, event = 1959, window = 10485774, place = -1}, xcirculaterequest = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, parent = 1959, window = 10485774, place = -1}, xproperty = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, window = 1959, atom = 10485774, time = 18446744073709551615, state = 84}, xselectionclear = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, window = 1959, selection = 10485774, time = 18446744073709551615}, xselectionrequest = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, owner = 1959, requestor = 10485774, selection = 18446744073709551615, target = 223338299476, property = 2, time = 8388639}, xselection = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, requestor = 1959, selection = 10485774, target = 18446744073709551615, property = 223338299476, time = 2}, xcolormap = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, window = 1959, colormap = 10485774, new = -1, state = -1}, xclient = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, window = 1959, message_type = 10485774, format = -1, data = {b = "T\000\000\000\064\000\000\000\002\000\000\000\000\000\000\000\037\000\200", s = {84, 0, 52, 0, 2, 0, 0, 0, 31, 128}, l = {223338299476, 2, 8388639, 17179869184, 12}}}, xmapping = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, window = 1959, request = 10485774, first_keycode = 0, count = -1}, xerror = {type = 20, display = 0xa82, resourceid = 0, serial = 94419258340720, error_code = 167 '\247', request_code = 7 '\a', minor_code = 0 '\000'}, xkeymap = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, window = 1959, key_vector = "\016\000\240\000\000\000\000\000\377\377\377\377\377\377\377\377T\000\000\000\064\000\000\000\002\000\000\000\000\000\000"}, xgeneric = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, extension = 1959, evtype = 0}, xcookie = {type = 20, serial = 2690, send_event = 0, display = 0x55dfb25a7570, extension = 1959, evtype = 0, cookie = 10485774, data = 0xffffffffffffffff}, pad = {288230376151711764, 2690, 0, 94419258340720, 1959, 10485774, -1, 223338299476, 2, 8388639, 17179869184, 12, 72057594037927936, 0, 0, 360287970206416896, 4899916395015307264, -4942020635640002809, -73187909594792001, -1, -1529316465461821955, -7779111786184085135, 6629298653603299328, 864691129226887168}}
#6  0x000055dfb1876610 in main (argc=<optimized out>, argv=<optimized out>) at ./fvwm/fvwm3.c:2523
        valuemask = 8202
        attributes = {background_pixmap = 0, background_pixel = 12500670, border_pixmap = 140026278677200, border_pixel = 0, bit_gravity = 1754686680, win_gravity = 32602, backing_store = 1754686720, backing_planes = 140730293203508, backing_pixel = 140026278506938, save_under = 30, event_mask = 2097155, do_not_propagate_mask = 140026278677200, override_redirect = 1, colormap = 32, cursor = 6291469}
        i = <optimized out>
        display_string = 0x55dfb25a9890 ""
        do_force_single_screen = <optimized out>
        single_screen_num = -1
        replace_wm = <optimized out>
        visualClass = <optimized out>
        visualId = -1
        colorLimitop = {color_limit = -1, strict = -1, allocate = -1, not_dynamic = -1, use_named_table = -1}
        exc = <optimized out>
        ecc = {type = EXCT_INIT, x = {etrigger = 0x7f5a675f8f80, elast = 0x7f5a00000000}, w = {fw = 0x7ffe5322b300, w = 140728898420736, wcontext = 8}, m = {module = 0x7f5a66e0c1e8}}
        m = <optimized out>
        __func__ = "main"

[ThomasAdam]

@farblos

Thanks. Can you please check the ta/gh-985 with your same tests, and let me know how you get on with that?

[farblos]

@ThomasAdam Thanks for the quick fix.

And yes, your commit indeed fixes the issue.

Just one minor nitpick, not sure whether this worries you: When running the test case, Fvwm succeeds to draw the window placement frame (just to discard it when it gets placed) in approx. 1 of 5 tries, in all other cases nothing at all happens. So something races there ...

[ThomasAdam]

@farblos -- that will have always been the case.