#0  PyEval_GetFrame () at Python/ceval.c:5664
#1  0x00000000012fba6f in BPY_python_backtrace ()
#2  0x000000000087ebb5 in sig_handle_crash ()
#3  <signal handler called>
#4  0x00007f895ac27585 in __GI___clock_nanosleep (clock_id=clock_id@entry=0, flags=flags@entry=0, req=req@entry=0x7fffed49ba20, rem=rem@entry=0x0) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:48
#5  0x00007f895ac2c097 in __GI___nanosleep (req=req@entry=0x7fffed49ba20, rem=rem@entry=0x0) at ../sysdeps/unix/sysv/linux/nanosleep.c:25
#6  0x00007f895ac57f59 in usleep (useconds=<optimized out>) at ../sysdeps/posix/usleep.c:31
#7  0x00000000010383aa in drw_deferred_shader_add.part ()
#8  0x00000000010388b9 in DRW_shader_from_material ()
#9  0x0000000000fc8f7a in eevee_material_get_ex.constprop ()
#10 0x0000000000fc910a in EEVEE_material_get ()
#11 0x0000000000fbeeac in material_opaque ()
#12 0x0000000000fc048d in EEVEE_materials_cache_populate ()
#13 0x0000000000fb53c3 in EEVEE_cache_populate ()
#14 0x0000000000f9f738 in drw_engines_cache_populate ()
#15 0x0000000000fa1260 in DRW_draw_render_loop_ex ()
#16 0x0000000000fa1401 in DRW_draw_render_loop_offscreen ()
#17 0x0000000001cb5532 in ED_view3d_draw_offscreen ()
#18 0x0000000001cb5c41 in ED_view3d_draw_offscreen_imbuf ()
#19 0x0000000001cb607c in ED_view3d_draw_offscreen_imbuf_simple ()
#20 0x0000000000e082a6 in wm_save_as_mainfile_exec ()
#21 0x0000000000e084e2 in wm_save_mainfile_invoke ()
#22 0x0000000000dfe372 in wm_operator_invoke(bContext*, wmOperatorType*, wmEvent const*, PointerRNA*, ReportList*, bool, bool) [clone .part.0] ()
#23 0x0000000000e01d52 in wm_handler_operator_call(bContext*, ListBase*, wmEventHandler*, wmEvent*, PointerRNA*, char const*) ()
#24 0x0000000000e02151 in wm_handlers_do_keymap_with_keymap_handler(bContext*, wmEvent*, ListBase*, wmEventHandler_Keymap*, wmKeyMap*, bool) ()
#25 0x0000000000e02b23 in wm_handlers_do_intern(bContext*, wmWindow*, wmEvent*, ListBase*) ()
#26 0x0000000000e0356d in wm_handlers_do(bContext*, wmEvent*, ListBase*) ()
#27 0x0000000000e04907 in wm_event_do_handlers ()
#28 0x0000000000df7b80 in WM_main ()
#29 0x000000000077f735 in main ()