Thread 1 "gnome-shell" received signal SIGSEGV, Segmentation fault.
0x00007f50612a82e7 in gbm_surface_release_buffer () from 
/lib/x86_64-linux-gnu/libgbm.so.1
(gdb) bt full
#0  0x00007f50612a82e7 in gbm_surface_release_buffer () at 
/lib/x86_64-linux-gnu/libgbm.so.1
#1  0x00007f5063665dbf in meta_drm_buffer_gbm_finalize (object=0x55a6d0d9c690) 
at ../src/backends/native/meta-drm-buffer-gbm.c:485
        buffer_gbm = <optimized out>
#2  0x00007f5064379dfd in g_object_unref () at 
/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#3  0x00007f506366f5b0 in g_set_object (new_object=0x55a6d0d9c890, 
object_ptr=0x55a6cefbc490) at /usr/include/glib-2.0/gobject/gobject.h:762
        old_object = 0x55a6d0d9c690
        _object_ptr = {in = 0x55a6cefbc490 "\220\310\331ЦU", out = 
0x55a6cefbc490}
        plane_state = 0x55a6cefbc490
#4  swap_plane_buffers (key=<optimized out>, user_data=<optimized out>, 
value=0x55a6cefbc490) at ../src/backends/native/meta-kms-crtc.c:487
        _object_ptr = {in = 0x55a6cefbc490 "\220\310\331ЦU", out = 
0x55a6cefbc490}
        plane_state = 0x55a6cefbc490
#5  swap_plane_buffers (key=<optimized out>, value=0x55a6cefbc490, 
user_data=<optimized out>) at ../src/backends/native/meta-kms-crtc.c:479
        plane_state = 0x55a6cefbc490
#6  0x00007f5064256698 in g_hash_table_foreach () at 
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007f506367b86c in meta_kms_crtc_on_scanout_started (crtc=<optimized 
out>, crtc=<optimized out>) at ../src/backends/native/meta-kms-crtc.c:496
        page_flip_data = 0x55a6cf69d180
        l = <optimized out>
        __func__ = "meta_kms_page_flip_data_flipped"
#8  meta_kms_page_flip_data_flipped (kms=<optimized out>, 
user_data=0x55a6cf69d180) at ../src/backends/native/meta-kms-page-flip.c:153
        page_flip_data = 0x55a6cf69d180
        l = <optimized out>
        __func__ = "meta_kms_page_flip_data_flipped"
#9  0x00007f5063695bce in flush_callbacks.isra.0 (kms=kms@entry=0x55a6cec0e9c0) 
at ../src/backends/native/meta-kms.c:478
        callback_data = 0x55a6cf078c30
        l = 0x55a6d08b2ec0 = {0x55a6cf078c30}
        callback_count = <optimized out>
#10 0x00007f506367b8dd in callback_idle (user_data=0x55a6cec0e9c0) at 
../src/backends/native/meta-kms.c:494
        kms = 0x55a6cec0e9c0
#11 0x00007f5064272c24 in g_main_context_dispatch () at 
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007f50642c76f8 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007f5064272293 in g_main_loop_run () at 
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007f50635e35c9 in meta_context_run_main_loop (context=<optimized out>, 
error=0x7ffc4dbf21e8) at ../src/core/meta-context.c:437
        priv = 0x55a6cec03050
        __func__ = "meta_context_run_main_loop"
#15 0x000055a6cce14f12 in  ()
#16 0x00007f5063314d90 in __libc_start_call_main 
(main=main@entry=0x55a6cce14a70, argc=argc@entry=1, 
argv=argv@entry=0x7ffc4dbf2388) at ../sysdeps/nptl/libc_start_call_main.h:58
        self = <optimized out>
        result = <optimized out>

                      unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 
6610810358620701876, 140721612858248, 94174890248816, 94174890265080, 
139983260733504, -6609371649918810956, -6548631210224696140}, mask_was_saved = 
0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, 
canceltype = 0}}}
        not_first_call = <optimized out>
#17 0x00007f5063314e40 in __libc_start_main_impl (main=0x55a6cce14a70, argc=1, 
argv=0x7ffc4dbf2388, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>, stack_end=0x7ffc4dbf2378) at ../csu/libc-start.c:392
#18 0x000055a6cce151b5 in  ()

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https://bugs.launchpad.net/bugs/1969422

Title:
  gnome-shell crashed with SIGSEGV in gbm_surface_release_buffer() from
  meta_drm_buffer_gbm_finalize() from g_object_unref() from
  g_object_unref() from g_set_object()

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