Public bug reported:
Both Cheese and GNOME Snapshot (gnome-snapshot) segfault on launch when using
the hardware GL path on my Lenovo ThinkPad X9-15 Gen 1 with Intel Lunar Lake
Xe2 integrated graphics. Apparently occurs inside libgallium (memcpy?) with a
texture. I'm no expert and the trace has some ??s. Setting
LIBGL_ALWAYS_SOFTWARE=1 avoids the crash entirely, confirming the bug is in the
hardware GL driver.
Other applications that use the camera (Zoom, OBS) work fine.
Hardware: Lenovo ThinkPad X9-15 Gen 1 (Intel Core Ultra 7 268V, Lunar Lake)
GPU: Intel Xe2 integrated graphics
OS: Ubuntu 24.04 LTS (Noble)
Kernel: 6.17.0-1020-oem
Mesa: 25.2.8-0ubuntu0.24.04.1 (from noble-updates)
GStreamer: 1.24.2-1ubuntu0.4
Session: Wayland
Camera: Intel MIPI (IPU7) via v4l2loopback
$ apt-cache policy mesa-va-drivers libgstreamer-gl1.0-0
mesa-va-drivers:
Installed: 25.2.8-0ubuntu0.24.04.1
Candidate: 25.2.8-0ubuntu0.24.04.1
Version table:
*** 25.2.8-0ubuntu0.24.04.1 500
500 http://nl.archive.ubuntu.com/ubuntu noble-updates/universe amd64
Packages
100 /var/lib/dpkg/status
24.0.5-1ubuntu1 500
500 http://nl.archive.ubuntu.com/ubuntu noble/universe amd64 Packages
libgstreamer-gl1.0-0:
Installed: 1.24.2-1ubuntu0.4
Candidate: 1.24.2-1ubuntu0.4
Version table:
*** 1.24.2-1ubuntu0.4 500
500 http://nl.archive.ubuntu.com/ubuntu noble-updates/main amd64
Packages
500 http://security.ubuntu.com/ubuntu noble-security/main amd64 Packages
100 /var/lib/dpkg/status
1.24.2-1 500
500 http://nl.archive.ubuntu.com/ubuntu noble/main amd64 Packages
Steps to Reproduce
Install Ubuntu 24.04 on a Lunar Lake system with current noble-updates
Launch Cheese: cheese
`DEBUGINFOD_URLS="https://debuginfod.ubuntu.com"; gdb -batch -ex "set debuginfod
enabled on" -ex run -ex bt -ex quit --args cheese 2>&1`
```
Download failed: Invalid argument. Continuing without source file
./string/../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S.
__memcpy_avx_unaligned_erms () at
../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:265
warning: 265 ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S: No
such file or directory
#0 __memcpy_avx_unaligned_erms () at
../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:265
#1 0x00007fffd9b6a804 in ?? () from
/lib/x86_64-linux-gnu/libgallium-25.2.8-0ubuntu0.24.04.1.so
#2 0x00007fffda28cb7a in ?? () from
/lib/x86_64-linux-gnu/libgallium-25.2.8-0ubuntu0.24.04.1.so
#3 0x00007fffd9584f9b in ?? () from
/lib/x86_64-linux-gnu/libgallium-25.2.8-0ubuntu0.24.04.1.so
#4 0x00007fffd958598a in ?? () from
/lib/x86_64-linux-gnu/libgallium-25.2.8-0ubuntu0.24.04.1.so
#5 0x00007fffd955a878 in ?? () from
/lib/x86_64-linux-gnu/libgallium-25.2.8-0ubuntu0.24.04.1.so
#6 0x00007fffd955cd31 in ?? () from
/lib/x86_64-linux-gnu/libgallium-25.2.8-0ubuntu0.24.04.1.so
#7 0x00007ffff6e5a0de in _cogl_texture_driver_upload_to_gl
(ctx=0x555555a0d410, gl_target=3553, gl_handle=<optimized out>, is_foreign=0,
source_bmp=0x5555562bd490, internal_gl_format=6403, source_gl_format=6403,
source_gl_type=5121, error=0x7fffffffd620) at
driver/gl/gl/cogl-texture-driver-gl.c:347
#8 0x00007ffff6e3dbc2 in allocate_from_bitmap (error=0x7fffffffd620,
loader=<optimized out>, tex_2d=0x55555587be40) at
driver/gl/cogl-texture-2d-gl.c:255
#9 _cogl_texture_2d_gl_allocate (tex=0x55555587be40, error=0x7fffffffd620) at
driver/gl/cogl-texture-2d-gl.c:462
#10 0x00007ffff6e7d0cb in cogl_texture_allocate (error=0x7fffffffd620,
texture=0x55555587be40) at
/build/cogl-YZID4v/cogl-1.22.8/cogl/cogl-texture.c:1398
#11 cogl_texture_allocate (texture=texture@entry=0x55555587be40,
error=error@entry=0x7fffffffd620) at
/build/cogl-YZID4v/cogl-1.22.8/cogl/cogl-texture.c:1384
#12 0x00007ffff6e7ebc7 in cogl_texture_2d_new_from_data (ctx=<optimized out>,
width=<optimized out>, height=<optimized out>,
format=format@entry=COGL_PIXEL_FORMAT_A_8, rowstride=<optimized out>,
data=<optimized out>, error=0x7fffffffd620) at
/build/cogl-YZID4v/cogl-1.22.8/cogl/cogl-texture-2d.c:225
#13 0x00007ffff7df27da in video_texture_new_from_data (ctx=<optimized out>,
width=<optimized out>, height=<optimized out>,
format=format@entry=COGL_PIXEL_FORMAT_A_8, rowstride=<optimized out>,
data=<optimized out>) at
/build/clutter-gst-3.0-ei5QZ1/clutter-gst-3.0-3.0.27/clutter-gst/clutter-gst-video-sink.c:1108
#14 0x00007ffff7df40fe in clutter_gst_nv12_upload (sink=0x555556082ed0,
buffer=<optimized out>) at
/build/clutter-gst-3.0-ei5QZ1/clutter-gst-3.0-3.0.27/clutter-gst/clutter-gst-video-sink.c:1717
#15 0x00007ffff7df5efe in clutter_gst_source_dispatch (source=0x5555561d5e80,
callback=<optimized out>, user_data=<optimized out>) at
/build/clutter-gst-3.0-ei5QZ1/clutter-gst-3.0-3.0.27/clutter-gst/clutter-gst-video-sink.c:2053
#16 0x00007ffff72e1585 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007ffff7340977 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007ffff72e0a23 in g_main_context_iteration () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007ffff751789d in g_application_run () from
/lib/x86_64-linux-gnu/libgio-2.0.so.0
#20 0x00005555555603a6 in ?? ()
#21 0x00007ffff6c2a1ca in __libc_start_call_main
(main=main@entry=0x555555560300, argc=argc@entry=1,
argv=argv@entry=0x7fffffffdd38) at ../sysdeps/nptl/libc_start_call_main.h:58
#22 0x00007ffff6c2a28b in __libc_start_main_impl (main=0x555555560300, argc=1,
argv=0x7fffffffdd38, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fffffffdd28) at ../csu/libc-start.c:360
#23 0x0000555555560445 in ?? ()
A debugging session is active.
```
`GST_DEBUG=3 snapshot 2>&1`
```
GST_DEBUG=3 snapshot 2>&1
2026-05-06T16:51:21.332134Z INFO snapshot::application::imp: Snapshot
(org.gnome.Snapshot)
2026-05-06T16:51:21.332153Z INFO snapshot::application::imp: Version: 46.2
2026-05-06T16:51:21.332155Z INFO snapshot::application::imp: Datadir:
/usr/share/snapshot
0:00:00.370056572 20209 0x7857a80039c0 FIXME default
gstutils.c:4088:gst_element_decorate_stream_id_internal:<preview-appsrc>
Creating random stream-id, consider implementing a deterministic way of
creating a stream-id
0:00:00.370135312 20209 0x7857a8003c80 FIXME default
gstutils.c:4088:gst_element_decorate_stream_id_internal:<camerasrc-real-src-actual-src-pipewir>
Creating random stream-id, consider implementing a deterministic way of
creating a stream-id
0:00:00.371562393 20209 0x78570001afc0 FIXME glcontext
gstglcontext.c:2038:gst_gl_wrapped_context_get_config:<glwrappedcontext0>
wrapped context could not retrieve config. The application may be missing a
call to gst_gl_context_fill_info() or the specific platform implemention is not
implemented for retrieving the config from a wrapped OpenGL context.
0:00:00.439359582 20209 0x7857a8003c80 FIXME default
gstutils.c:4088:gst_element_decorate_stream_id_internal:<preview-appsrc>
Creating random stream-id, consider implementing a deterministic way of
creating a stream-id
0:00:00.439398913 20209 0x7857a80039c0 FIXME default
gstutils.c:4088:gst_element_decorate_stream_id_internal:<pipewiresrc0> Creating
random stream-id, consider implementing a deterministic way of creating a
stream-id
0:00:00.443473307 20209 0x7857a80039c0 FIXME decodebin3
gstdecodebin3.c:1690:update_requested_selection:<decodebin3-0> Implement
EXPOSE_ALL_MODE
0:00:00.705317836 20209 0x7857a80039c0 FIXME decodebin3
gstdecodebin3-parse.c:454:unblock_pending_input:<decodebin3-0> Re-use existing
input streams if/when possible
0:00:00.705830052 20209 0x7857a8001e40 FIXME decodebin3
gstdecodebin3.c:2273:get_output_for_slot:<decodebin3-0> emit autoplug-continue
0:00:00.705858688 20209 0x7857a8001e40 FIXME decodebin3
gstdecodebin3.c:2276:get_output_for_slot:<decodebin3-0> Handle EXPOSE_ALL_MODE
0:00:00.706863864 20209 0x78574800a940 FIXME glcontext
gstglcontext.c:2038:gst_gl_wrapped_context_get_config:<glwrappedcontext0>
wrapped context could not retrieve config. The application may be missing a
call to gst_gl_context_fill_info() or the specific platform implemention is not
implemented for retrieving the config from a wrapped OpenGL context.
Segmentation fault (core dumped)
```
Observe segfault
Installed:
```
mesa-va-drivers 25.2.8-0ubuntu0.24.04.1
mesa-vulkan-drivers 25.2.8-0ubuntu0.24.04.1
mesa-vdpau-drivers 25.2.8-0ubuntu0.24.04.1
mesa-libgallium 25.2.8-0ubuntu0.24.04.1
libgl1-mesa-dri 25.2.8-0ubuntu0.24.04.1
libegl-mesa0 25.2.8-0ubuntu0.24.04.1
libglx-mesa0 25.2.8-0ubuntu0.24.04.1
libgstreamer-gl1.0-0 1.24.2-1ubuntu0.4
cheese 46.1-3
gnome-snapshot 46.2-1ubuntu2
```
Hope this helps. Tried my best to provide the traces to confirm if this
is indeed a bug.
** Affects: mesa (Ubuntu)
Importance: Undecided
Status: New
** Summary changed:
- Mesa 25.2.8 segfaults during GL texture upload on Intel Lunar Lake (Xe2) —
crashes Cheese (and GNOME Snapshot)
+ Mesa 25.2.8 segfaults during GL texture upload on Intel Lunar Lake (Xe2)
crashes Cheese (and GNOME Snapshot)
--
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https://bugs.launchpad.net/bugs/2151718
Title:
Mesa 25.2.8 segfaults during GL texture upload on Intel Lunar Lake
(Xe2) crashes Cheese (and GNOME Snapshot)
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https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/2151718/+subscriptions
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