Sergei Poljanski
1d1f5600eb
gnome-shell keeps segfaulting in libmutter, and with the PAM core limit at 0 systemd-coredump threw every dump away, so there was no backtrace to work from. Raise the limit to unlimited; dumps land root-owned in /var/lib/systemd/coredump, readable only by their owner. Enable nixseparatedebuginfod2 so gdb/coredumpctl can fetch symbols for store paths on demand. The user manager inherits the limit at its first login, so it takes a reboot (or a full logout) to apply. Assisted-by: Claude:opus-5
30 lines
1 KiB
Diff
30 lines
1 KiB
Diff
From: asxpi <asxpi@narayana.im>
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Subject: [PATCH] wayland/touch: Don't crash on grab requests for cancelled touches
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meta_wayland_touch_cancel() clears focus_surface on every active
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MetaWaylandTouchInfo but keeps the entries (and their slot_serial)
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until the touch ends. A client that sends xdg_toplevel.resize/move,
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an xdg_popup grab, start_drag or an activation request with the serial
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of such a touch makes meta_wayland_touch_find_grab_sequence() call
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touch_can_grab_surface(), which dereferences the NULL focus_surface:
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#0 touch_can_grab_surface
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#1 meta_wayland_touch_find_grab_sequence
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#2 meta_wayland_seat_get_grab_info
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#3 xdg_toplevel_resize
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A cancelled touch cannot grab anything; treat it as such.
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---
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--- a/src/wayland/meta-wayland-touch.c
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+++ b/src/wayland/meta-wayland-touch.c
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@@ -656,6 +656,10 @@
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{
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MetaWaylandSurface *subsurface;
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+ /* Cleared by meta_wayland_touch_cancel() while the touch is still down */
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+ if (!touch_info->focus_surface)
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+ return FALSE;
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+
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if (touch_info->focus_surface->surface == surface)
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return TRUE;
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