Thanks for the bug report.
> #4 0x0000751585ec1a32 pixman_region32_n_rects (libpixman-1.so.0 + 0x62a32)
> #5 0x0000000000000001 n/a (n/a + 0x0)
This looks like the stack frame has been clobbered by a pixman function.
> #6 0x00007515892ae592 n/a (libmutter-14.so.0 + 0xae592)
This looks like region_apply_transform_expand_maybe_ref() calling
mtk_region_apply_matrix_transform_expand(), but the former has been
inlined in cull_out_children_common().
Overall, it looks like mtk_region_apply_matrix_transform_expand is
misbehaving. That code did change in Mutter 50.0 with commit
e0d02d0e2ed785, but no fixes were ever backported (if they fixed the
issue at all).
I suggest:
1. First, try deleting all local extensions:
cd ~/.local/share/gnome-shell/
rm -rf extensions
and log in again. In case an unsupported extension is leading you to
this situation.
2. Try Ubuntu 26.04 which contains the aforementioned fix.
** Tags added: noble
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2167614
Title:
gnome-shell SIGSEGV in pixman_region32_n_rects from libmutter-14 paint
path (Wayland), GDM greeter shell also crashes
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