Emacs crashes:
#0 0x00007f4c889aaefb in raise () from /lib/x86_64-linux-gnu/libpthread.so.0
#1 0x0000000000517898 in terminate_due_to_signal (sig=sig@entry=6,
backtrace_limit=backtrace_limit@entry=2147483647) at emacs.c:378
#2 0x000000000057d644 in die (msg=msg@entry=0x644af8 "FRAMEP
(globals.f_Vmenu_updating_frame)",
file=file@entry=0x644c03 "menu.c", line=line@entry=469) at alloc.c:6833
#3 0x000000000047c543 in encode_menu_string (str=<optimized out>) at menu.c:469
#4 encode_menu_string (str=<optimized out>) at menu.c:465
#5 0x000000000047c7e5 in list_of_panes (menu=<optimized out>) at menu.c:515
#6 0x0000000000480b42 in xw_popup_dialog (f=0x129eca8, header=13116274,
contents=20629990)
at xmenu.c:2051
#7 0x000000000059dbda in eval_sub (form=form@entry=20632694) at eval.c:2191
#8 0x00000000005a0542 in Feval (form=20632694, lexical=<optimized out>) at
eval.c:2003
[...]