gnome-shell crashed at xcb_io.c:260: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost'' failed
This is by far the most common gnome-shell crash we are seeing in 3.36 on Ubuntu:
Stack trace
#6 0x00007f4826322f36 in __GI___assert_fail (assertion=assertion@entry=0x7f4825ee4858 "!xcb_xlib_threads_sequence_lost", file=file@entry=0x7f4825ee46c3 "../../src/xcb_io.c", line=line@entry=260, function=function@entry=0x7f4825ee4b10 <__PRETTY_FUNCTION__.14999> "poll_for_event") at assert.c:101 No locals. #7 0x00007f4825e70493 in poll_for_event (dpy=dpy@entry=0x5563a5206000, queued_only=queued_only@entry=0) at ../../src/xcb_io.c:260 request = req = event = event_sequence = __PRETTY_FUNCTION__ = "poll_for_event" #8 0x00007f4825e7053d in poll_for_response (dpy=dpy@entry=0x5563a5206000) at ../../src/xcb_io.c:278 response = error = 0x5563a5206000 req = __PRETTY_FUNCTION__ = "poll_for_response" #9 0x00007f4825e7083a in _XEventsQueued (mode=, dpy=0x5563a5206000) at ../../src/xcb_io.c:362 response = response = #10 _XEventsQueued (dpy=0x5563a5206000, mode=) at ../../src/xcb_io.c:344 response = #11 0x00007f4825e7382d in _XGetRequest (dpy=dpy@entry=0x5563a5206000, type=type@entry=43 '+', len=len@entry=4) at ../../src/XlibInt.c:1764 req = #12 0x00007f4825e6c62f in XSync (dpy=0x5563a5206000, discard=0) at ../../src/Sync.c:43 rep = {type = 224 '\340', revertTo = 64 '@', sequenceNumber = 42307, length = 21859, focus = 2770640640, pad1 = 21859, pad2 = 1, pad3 = 0, pad4 = 540412912, pad5 = 32584} req = #13 0x00007f4825fdaa53 in _cogl_winsys_onscreen_bind () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-cogl-6.so.0 No symbol table info available. #14 0x00007f4825f998eb in _cogl_framebuffer_gl_bind () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-cogl-6.so.0 No symbol table info available. #15 0x00007f4825f99ec5 in _cogl_framebuffer_gl_flush_state () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-cogl-6.so.0 No symbol table info available. #16 0x00007f4825fd0c5a in cogl_framebuffer_clear4f () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-cogl-6.so.0 No symbol table info available. #17 0x00007f482676be54 in clutter_root_node_pre_draw () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-clutter-6.so.0 No symbol table info available. #18 0x00007f482676ee69 in clutter_paint_node_paint () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-clutter-6.so.0 No symbol table info available. #19 0x00007f482676ee93 in clutter_paint_node_paint () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-clutter-6.so.0 No symbol table info available. #20 0x00007f482671dc2c in clutter_actor_continue_paint () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-clutter-6.so.0 No symbol table info available. #21 0x00007f482676ee7a in clutter_paint_node_paint () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-clutter-6.so.0 No symbol table info available. #22 0x00007f482676ee93 in clutter_paint_node_paint () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-clutter-6.so.0 No symbol table info available. #23 0x00007f48267250ab in clutter_actor_paint () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-clutter-6.so.0 No symbol table info available. #24 0x00007f4826784aeb in clutter_stage_do_paint_view () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-clutter-6.so.0 No symbol table info available. #25 0x00007f48265581a0 in meta_stage_paint_view (stage=0x5563a5431900, view=0x5563a523d340, redraw_clip=0x5563aaf58e20) at ../src/backends/meta-stage.c:221 meta_stage = 0x5563a5431900 #26 0x00007f48267aa3c5 in paint_stage () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-clutter-6.so.0 No symbol table info available. #27 0x00007f48267ab789 in clutter_stage_cogl_redraw_view () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-clutter-6.so.0 No symbol table info available. #28 0x00007f48267ac12a in clutter_stage_cogl_redraw () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-clutter-6.so.0 No symbol table info available. #29 0x00007f4826781d3f in _clutter_stage_do_update () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-clutter-6.so.0 No symbol table info available. #30 0x00007f4826769471 in clutter_clock_dispatch () from /srv/daisy.ubuntu.com/production/cache/Ubuntu 20.04/cache-bRihWG/sandbox/Ubuntu 20.04/amd64/report-sandbox/usr/lib/x86_64-linux-gnu/mutter-6/libmutter-clutter-6.so.0
Edited by Daniel van Vugt