I found the if_lua problem.
If I edit Vim script variables in if_lua, Segmentation Fault will occur.
This is test script:
---------------------------------------------------------------
$ cat foo.vim
lua lst = vim.eval('[]')
call garbagecollect()
$ vim -c 'call feedkeys(repeat(":so foo.vim\<CR>", 10000))'
SEGV
This is stack trace:
---------------------------------------------------------------
warning: core file may not match specified executable file.
[New LWP 18349]
[New LWP 18351]
Cannot access memory at address 0x6
Cannot access memory at address 0x2
(gdb) bt
#0 0xb7778424 in ?? ()
#1 0x0816a859 in get_x11_windis () at os_unix.c:1750
#2 0x082166eb in netbeans_close () at netbeans.c:192
#3 0x0812e0be in get_c_indent () at misc1.c:8456
#4 0x08168c3a in shortmess (x=11) at option.c:11032
#5 <signal handler called>
#6 list_free (l=0x772f7e28, recurse=414) at eval.c:5949
#7 0x080997a5 in list_free (l=0xa717f40, recurse=414) at eval.c:5943
#8 0x08099843 in listitem_free (item=0xa6ca580) at eval.c:5975
#9 0x080997a5 in list_free (l=0xa4de290, recurse=414) at eval.c:5943
#10 0x08099843 in listitem_free (item=0xa49be50) at eval.c:5975
#11 0x08099774 in list_free (l=0xa4d45ac, recurse=414) at eval.c:5935
#12 0x08099499 in get_lit_string_tv (arg=0x0, rettv=0x0, evaluate=0) at
eval.c:5797
#13 0x080f7d82 in AppendToRedobuffLit (str=0x3e8 <Address 0x3e8 out of bounds>,
len=0) at getchar.c:599
#14 0x081f5b56 in gui_write (s=0xffffffff <Address 0xffffffff out of bounds>,
len=7) at gui.c:1760
#15 0x081def13 in replace_termcodes (from=0xa341dc1 "", bufp=0x42,
from_part=-1, do_lt=23598, special=170362528) at term.c:5210
#16 0x080f9f3b in vgetorpeek (advance=171187649) at getchar.c:2199
#17 0x080f9b69 in vgetorpeek (advance=1) at getchar.c:2082
#18 0x080f7ea8 in stuffReadbuffSpec (s=0x1 <Address 0x1 out of bounds>) at
getchar.c:669
#19 0x080f83dc in ins_typebuf (str=0xbffad2fc "\200\323", <incomplete sequence
\372\277>, noremap=-1074081108, offset=52,
nottyped=136160558, silent=169019552) at getchar.c:954
#20 0x08140938 in xim_init () at mbyte.c:4921
#21 0x082163f4 in ruby_vim_init () at if_ruby.c:1347
#22 0x08215d9e in window_set_cursor (self=1, pos=3220886932) at if_ruby.c:1270
#23 0xb6a7b935 in ?? ()
(gdb)
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