Thread C++ Error not showing up in GUI

[npip99]

Godot version: v3.2.alpha0.official

OS/device including version: Ubuntu 18.04.3

Issue description:

My game seems to randomly just close down, leaving ** Debug Process Stopped **. I have no error at all in the godot GUI, it all looks clear.

But, when I run from commandline, I get

ERROR: operator[]: FATAL: Index p_index=109 out of size (((Vector<T> *)(this))->_cowdata.size()=109)
   At: ./core/vector.h:49.
handle_crash: Program crashed with signal 4
Dumping the backtrace. Please include this when reporting the bug on https://github.com/godotengine/godot/issues
[1] /lib/x86_64-linux-gnu/libc.so.6(+0x3ef20) [0x7ff448390f20] (??:0)
[2] godot-raw() [0xdbe1ff] (??:?)
[3] godot-raw() [0xdbe357] (??:?)
[4] godot-raw() [0xb3a361] (<artificial>:?)
[5] godot-raw() [0xb6285d] (??:?)
[6] godot-raw() [0x2931b00] (<artificial>:?)
[7] godot-raw() [0x294fdc8] (<artificial>:?)
[8] godot-raw() [0xbe75ef] (??:?)
[9] godot-raw() [0xb6294d] (??:?)
[10] godot-raw() [0x2931b00] (<artificial>:?)
[11] godot-raw() [0x294fdc8] (<artificial>:?)
[12] godot-raw() [0xbe75ef] (??:?)
[13] godot-raw() [0xb6294d] (??:?)
[14] godot-raw() [0x2931b00] (<artificial>:?)
[15] godot-raw() [0x294fdc8] (<artificial>:?)
[16] godot-raw() [0xbe75ef] (??:?)
[17] godot-raw() [0xb6294d] (??:?)
[18] godot-raw() [0x2931b00] (<artificial>:?)
[19] godot-raw() [0x294fdc8] (<artificial>:?)
[20] godot-raw() [0xbe75ef] (??:?)
[21] godot-raw() [0xb6294d] (??:?)
[22] godot-raw() [0x2931b00] (<artificial>:?)
[23] godot-raw() [0x294fdc8] (<artificial>:?)
[24] godot-raw() [0xbe75ef] (??:?)
[25] godot-raw() [0xb6294d] (??:?)
[26] godot-raw() [0x2931b00] (<artificial>:?)
[27] godot-raw() [0x294fdc8] (<artificial>:?)
[28] godot-raw() [0xbe75ef] (??:?)
[29] godot-raw() [0xb6294d] (??:?)
[30] godot-raw() [0x2931b00] (<artificial>:?)
[31] godot-raw() [0x294fdc8] (<artificial>:?)
[32] godot-raw() [0xbe75ef] (??:?)
[33] godot-raw() [0xb6294d] (??:?)
[34] godot-raw() [0x2931b00] (<artificial>:?)
[35] godot-raw() [0x294fdc8] (<artificial>:?)
[36] godot-raw() [0xbe75ef] (??:?)
[37] godot-raw() [0xb6294d] (??:?)
[38] godot-raw() [0x2931b00] (<artificial>:?)
[39] godot-raw() [0x294fdc8] (<artificial>:?)
[40] godot-raw() [0xbe75ef] (??:?)
[41] godot-raw() [0xb6294d] (??:?)
[42] godot-raw() [0x2931b00] (<artificial>:?)
[43] godot-raw() [0x294fdc8] (<artificial>:?)
[44] godot-raw() [0xbe75ef] (??:?)
[45] godot-raw() [0xb6294d] (??:?)
[46] godot-raw() [0x2931b00] (<artificial>:?)
[47] godot-raw() [0x294fdc8] (<artificial>:?)
[48] godot-raw() [0xbe75ef] (??:?)
[49] godot-raw() [0xb6294d] (??:?)
[50] godot-raw() [0x2931b00] (<artificial>:?)
[51] godot-raw() [0x294fdc8] (<artificial>:?)
[52] godot-raw() [0xbe75ef] (??:?)
[53] godot-raw() [0xb6294d] (??:?)
[54] godot-raw() [0x2931b00] (<artificial>:?)
[55] godot-raw() [0x294fdc8] (<artificial>:?)
[56] godot-raw() [0xbe75ef] (??:?)
[57] godot-raw() [0xb6294d] (??:?)
[58] godot-raw() [0x2931b00] (<artificial>:?)
[59] godot-raw() [0x294fdc8] (<artificial>:?)
[60] godot-raw() [0xbe75ef] (??:?)
[61] godot-raw() [0xb6294d] (??:?)
[62] godot-raw() [0x2931b00] (<artificial>:?)
[63] godot-raw() [0x294fdc8] (<artificial>:?)
[64] godot-raw() [0xbe75ef] (??:?)
[65] godot-raw() [0xb6294d] (??:?)
[66] godot-raw() [0x2931b00] (<artificial>:?)
[67] godot-raw() [0x294fdc8] (<artificial>:?)
[68] godot-raw() [0xbe75ef] (??:?)
[69] godot-raw() [0xb6294d] (??:?)
[70] godot-raw() [0x2931b00] (<artificial>:?)
[71] godot-raw() [0x294fdc8] (<artificial>:?)
[72] godot-raw() [0xbe75ef] (??:?)
[73] godot-raw() [0xb6294d] (??:?)
[74] godot-raw() [0x2931b00] (<artificial>:?)
[75] godot-raw() [0x294fdc8] (<artificial>:?)
[76] godot-raw() [0xbe75ef] (??:?)
[77] godot-raw() [0xb6294d] (??:?)
[78] godot-raw() [0x2931b00] (<artificial>:?)
[79] godot-raw() [0x294fdc8] (<artificial>:?)
[80] godot-raw() [0xbe75ef] (??:?)
[81] godot-raw() [0xb6294d] (??:?)
[82] godot-raw() [0x2931b00] (<artificial>:?)
[83] godot-raw() [0x294fcf0] (<artificial>:?)
[84] godot-raw() [0x193dadf] (??:?)
[85] godot-raw() [0x27fd986] (??:?)
[86] godot-raw() [0xba32d4] (??:?)
[87] godot-raw() [0x181551e] (<artificial>:?)
[88] godot-raw() [0x1855d0e] (??:?)
[89] godot-raw() [0x28c0310] (??:?)
[90] godot-raw() [0x834b7d] (??:?)
[91] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7ff448373b97] (??:0)
[92] godot-raw() [0x841d3e] (??:?)

So, it seems this error should have been appearing in the Godot GUI, but it wasn't. I tried pulling up gdb, and found this:

[New Thread 0x7fffc3566700 (LWP 15646)]
ERROR: operator[]: FATAL: Index p_index=68 out of size (((Vector<T> *)(this))->_cowdata.size()=68)
   At: ./core/vector.h:49.

Thread 1 "godot-raw" received signal SIGILL, Illegal instruction.
0x0000000000dbe1ff in Array::operator[](int) ()
(gdb) stop
(gdb) disas
Dump of assembler code for function _ZN5ArrayixEi:
   0x0000000000dbe180 <+0>:	push   %rbp
   0x0000000000dbe181 <+1>:	push   %rbx
   0x0000000000dbe182 <+2>:	movslq %esi,%rbx
   0x0000000000dbe185 <+5>:	sub    $0x8,%rsp
   0x0000000000dbe189 <+9>:	mov    (%rdi),%rbp
   0x0000000000dbe18c <+12>:	mov    0x10(%rbp),%rax
   0x0000000000dbe190 <+16>:	test   %ebx,%ebx
   0x0000000000dbe192 <+18>:	js     0xdbe1c0 <_ZN5ArrayixEi+64>
   0x0000000000dbe194 <+20>:	test   %rax,%rax
   0x0000000000dbe197 <+23>:	je     0xdbe1d0 <_ZN5ArrayixEi+80>
   0x0000000000dbe199 <+25>:	cmp    $0x4,%rax
   0x0000000000dbe19d <+29>:	je     0xdbe1d0 <_ZN5ArrayixEi+80>
   0x0000000000dbe19f <+31>:	cmp    -0x4(%rax),%ebx
   0x0000000000dbe1a2 <+34>:	jge    0xdbe210 <_ZN5ArrayixEi+144>
   0x0000000000dbe1a4 <+36>:	lea    0x10(%rbp),%rdi
   0x0000000000dbe1a8 <+40>:	callq  0x28a7d70 <_ZN7CowDataI7VariantE14_copy_on_writeEv>
   0x0000000000dbe1ad <+45>:	mov    0x10(%rbp),%rax
   0x0000000000dbe1b1 <+49>:	lea    (%rbx,%rbx,2),%rdx
   0x0000000000dbe1b5 <+53>:	add    $0x8,%rsp
   0x0000000000dbe1b9 <+57>:	pop    %rbx
   0x0000000000dbe1ba <+58>:	pop    %rbp
   0x0000000000dbe1bb <+59>:	lea    (%rax,%rdx,8),%rax
   0x0000000000dbe1bf <+63>:	retq   
   0x0000000000dbe1c0 <+64>:	test   %rax,%rax
   0x0000000000dbe1c3 <+67>:	je     0xdbe1d0 <_ZN5ArrayixEi+80>
   0x0000000000dbe1c5 <+69>:	cmp    $0x4,%rax
   0x0000000000dbe1c9 <+73>:	jne    0xdbe210 <_ZN5ArrayixEi+144>
   0x0000000000dbe1cb <+75>:	nopl   0x0(%rax,%rax,1)
   0x0000000000dbe1d0 <+80>:	xor    %r8d,%r8d
   0x0000000000dbe1d3 <+83>:	lea    0x1c5c6c6(%rip),%rax        # 0x2a1a8a0
   0x0000000000dbe1da <+90>:	pushq  $0x1
   0x0000000000dbe1dc <+92>:	movslq %ebx,%rcx
   0x0000000000dbe1df <+95>:	lea    0x1d2afc9(%rip),%r9        # 0x2ae91af
   0x0000000000dbe1e6 <+102>:	push   %rax
   0x0000000000dbe1e7 <+103>:	mov    $0x31,%edx
   0x0000000000dbe1ec <+108>:	lea    0x1c6582c(%rip),%rsi        # 0x2a23a1f
   0x0000000000dbe1f3 <+115>:	lea    0x1cb26ae(%rip),%rdi        # 0x2a708a8 <_ZZN16VectorWriteProxyI7VariantEixEiE12__FUNCTION__>
   0x0000000000dbe1fa <+122>:	callq  0xdbd1c0 <_Z22_err_print_index_errorPKcS0_illS0_S0_b>
=> 0x0000000000dbe1ff <+127>:	ud2    
   0x0000000000dbe201 <+129>:	data16 data16 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
   0x0000000000dbe210 <+144>:	movslq -0x4(%rax),%r8
   0x0000000000dbe214 <+148>:	jmp    0xdbe1d3 <_ZN5ArrayixEi+83>

The program hangs when it tried to execute "ud2", which is an illegal instruction. But, you can see right before that is when it called _Z22_err_print_index_errorPKcS0_illS0_S0_b, or demangled it would be _err_print_index_error(char const*, char const*, int, long, long, char const*, char const*, bool). This correctly prints to terminal, but fails to print to the Godot console. I'm thinking it's because it almost immediately crashes after calling _err_print_index_error.

Most desirably, this should be showing where in the GDScript the error is. But, I understand sometimes that's hard to implement. But, it should at the minimum be showing the C++ error in the console, as it usually does.

Minimal reproduction project:
I've tried to create one but I can't other than this specific instance in my project. Hopefully I've left enough information, if you want more data collection I'd be happy to help.

[KoBeWi]

Can anyone still reproduce this bug in Godot 3.2.3 or any later release?

If yes, please ensure that an up-to-date Minimal Reproduction Project (MRP) is included in this report (a MRP is a zipped Godot project with the minimal elements necessary to reliably trigger the bug). You can upload ZIP files in an issue comment with a drag and drop.