Processing tons of data with pointers causes code to constantly crash.

[XanCraft21]

Basic Infos

• [X ] This issue complies with the issue POLICY doc.
• [X ] I have read the documentation at readthedocs and the issue is not addressed there.
• [X ] I have tested that the issue is present in current master branch (aka latest git).
• [X ] I have searched the issue tracker for a similar issue.
• If there is a stack dump, I have decoded it. (I will do this part soon.)
• [X ] I have filled out all fields below.

Platform

• Hardware: ESP-12E
• Core Version: 3.1.1
• Development Env: Arduino IDE
• Operating System: Windows 10

Settings in IDE

• Module: NodeMCU 1.0 (ESP-12E Module)

• Flash Mode: DOUT (I don't remember the default setting for NodeMCU since the option is not present for this board selection)

• Flash Size: 4MB (FS:none OTA:~1019KB)

• lwip Variant: v2 Lower Memory

• Reset Method: dtr nodemcu (Not sure of setting for NodeMCU, not listed when this is selected)

• Flash Frequency: 40Mhz

• CPU Frequency: 160MHz

• Upload Using: SERIAL

• Upload Speed: 256000 (Highest i can go before it gets unstable)

Problem Description

I posted this in a discussion since the issue template is over complicated, but i got no answer, so i tried my hardest to make an issue with the given template. When i process tons of data using data pointers, the code crashes every time. I tried different settings, i made sure i have enough ram, i even tried force optimizing the code in the platform .txt file. Nothing makes it work. The code i am working with is basic 3D rendering, i even used a very lightweight header only code i found on codeberg by DrummyFish called Small3DLib. It works fine on my other controllers, and i only think it crashes when reading from a large array from a pointer, and maybe when writing to some other arrays using pointers. I'm surprised no-one else has this same problem, and this bug has been there for many past versions of the Arduino core. I have not decoded the stack dump yet but i will when i get to it. So far the errors i can see are Exception 3, reset reason 2. If i enable the debug output port to CORE mode i get a Load store error. If anyone can figure out the problem and fix it i will gladly appreciate it. Thank you for any help i can get.

MCVE Sketch

The sketch is too complicated and large to make a minimal version of it. if you need me to i will create a gist and link it here.

Debug Messages

If this is the debug message using the debug setting in Arduino i have one, but if not i need to decode my stack dump.

SDK:2.2.2-dev(38a443e)/Core:3.1.1=30101000/lwIP:STABLE-2_1_3_RELEASE/glue:1.2-65-g06164fb/BearSSL:b024386
Fatal exception 3(LoadStoreErrorCause):
epc1=0x40201764, epc2=0x00000000, epc3=0x00000000, excvaddr=0x4024e0e8, depc=0x00000000

[mcspr]

Does it work with Non-32-bit access menu option enabled?

The idea of template is to have as much info as possible. Exception address above is meaningless without some context like code and / or decoded stack trace, as it points to some of your functions (which we obviously don't known anything about)

[XanCraft21]

No, it does not work with that setting enabled.

What other information do you think i should add? I will add a code soon, i hope it’s ok i use gist since it’s too complex for me to condense.

I will decode the stack trace when i get a chance, i was low on time when i wrote this.

[d-a-v]

Software-only code can be tested and debugged on computers (linux, mac, windows/WSL2) using emulation on host.
Tools like valgrind can help tracking issues.

[XanCraft21]

Ok, it might take a while before i can get the decoded message done.

I still don’t understand what MCVE sketch is, is that my sketch i wrote my program on? Since my sketch is too complex to make smaller would you like me to send a link to a gist for each file, or should i attach to download?

[mcspr]

Whatever you think is sufficient.

The goal here is to have some small example of the code that fails; it can be reproduced by anyone reading this issue, not just by you alone. If it is something related to core, we can fix it. If not, up to you I am afraid
Decoded exception usually points at the failing line, or at least somewhere in the vicinity

[XanCraft21]

Sorry for the late reply, i’ve been having trouble with time, i will send a code file here soon. But for now i feel like the bug may never get fixed for a long time, since i don’t think many people have reported this type of bug. I will temporarily close this issue and reopen it when i am able to test more things and send links.