Public bug reported:
## Summary
gnome-shell 46.0 crashes with SIGTRAP when mutter's
`meta_window_destroy_frame()` calls `XReparentWindow` on a window being
destroyed. Because X11 delivers the resulting `BadWindow` error
asynchronously, it surfaces later at the next synchronous X call
(`XInternAtom` in `meta_x11_selection_handle_selection_request`), where
`mtk_x_error` → `g_error()` kills gnome-shell fatally.
The root cause is missing error traps around `XReparentWindow` calls in
`src/x11/meta-x11-frame.c`. These traps were added upstream in May 2024
— after the gnome-46 branch was created — and were never backported to
Ubuntu 24.04.
## Missing upstream commits
The following three commits on mutter main (all 2024-05-27) add the
required error traps:
- `b0df2d0f` — x11: Add error trap around XReparentWindow in
meta_window_destroy_frame
- `e1dbf102` — x11: Add error trap around XReparentWindow in
meta_window_create_frame
- `2065214b` — x11: Related cleanup / consolidation
Confirmed by mutter developer @skeller
(gitlab.gnome.org/GNOME/mutter/-/issues/4684#note_2713562):
> "On 50 and a few earlier versions all calls to XReparentWindow in mutter and
> gnome-shell are surrounded by error traps. So this is probably Ubuntu missing
> some fixes."
## Stack trace (mutter 46.2, Ubuntu 24.04, with debug symbols from
ddebs.ubuntu.com)
```
#0 g_log_structured_array (log_level=G_LOG_LEVEL_ERROR) at gmessages.c:426
#1 g_log_default_handler (log_domain="Mtk",
message="Received an X Window System error.
The error was 'BadWindow (invalid Window parameter)'.
Details: serial 418053 error_code 3 request_code 7 (core protocol)
minor_code 0")
#4 display_error_event (error=...) at mtk/mtk/mtk-x11-errors.c:116
#5 mtk_x_error () at mtk/mtk/mtk-x11-errors.c:139
#6 _XError () at libX11.so.6
#9 _XReply () at libX11.so.6
#10 XInternAtom () at libX11.so.6
#11 meta_x11_selection_handle_selection_request (xevent=..., x11_display=...)
at src/x11/meta-x11-selection.c:238
#12 meta_x11_selection_handle_event () at src/x11/meta-x11-selection.c:450
#13 process_selection_event () at src/x11/events.c:1799
#14 meta_x11_display_handle_xevent () at src/x11/events.c:1878
#16 meta_x11_event_source_dispatch () at src/x11/meta-x11-event-source.c:62
#17 g_main_dispatch () at gmain.c:3344
#20 g_main_loop_run () at gmain.c:4419
#21 meta_context_run_main_loop () at src/core/meta-context.c:523
```
## Environment
- OS: Ubuntu 24.04 (Noble)
- gnome-shell: 46.0-0ubuntu6~24.04.13
- mutter: 46.2-1ubuntu0.24.04.14
- Kernel: 6.17.0-19-generic x86_64
## Upstream reference
gitlab.gnome.org/GNOME/mutter/-/issues/4684
## Fix
Backport commits b0df2d0f, e1dbf102, 2065214b to the Ubuntu 24.04 mutter
package.
** Affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Tags: backport-request crash gnome-shell x11
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https://bugs.launchpad.net/bugs/2145049
Title:
mutter 46.2 missing error trap fixes for XReparentWindow (BadWindow
crash in gnome-shell)
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