Event Manager crashes in Submit Event

[RUBEN D]

Hello, 
I'm working with the event manager doing a customized Asset Tracking version firmware. The problem is that when I attempt to submit an event with an array with fixed size, the app crashes, I can't figure it out where the problem is. 

This is the EventType structure: 

This is how I create and submit this event:

But I getting this error: 



This error occurs only when assign values to 3 or more elements of the array, otherwise the firmware is working excellent without errors or bugs.

Also, this is my configuration in prj.conf

# Heap and stacks
CONFIG_MAIN_STACK_SIZE=2048
CONFIG_HEAP_MEM_POOL_SIZE=32768
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096

[Mariano Goluboff]

Hi Ruben,

The code looks very similar to the way that Asset Tracker v2 is done. A few questions:

1) What is the array that you are trying to assign values to? 

2) What version of the SDK are you using?

3) In src/events/app_module_event.c, in function log_event, can you try changing the size of the data_types buffer from the current 50 to something larger, like 100? This is not a recommended possible solution, but just to test if the buffer overflow is happening in this function.

Mariano

[RUBEN D]

Hi Mariano, 

I solved this problem; I modified the array size as you recommended and it works, thanks!
I'm using the 1.9.1 SDK version.

[Mariano Goluboff]

That's good to hear. Increasing the size of the buffer will fix it for now, but if you increase the amount of data over 100, it will happen again. A more permanent fix is to check the amount of data going into the buffer. Here are the changes necessary to app_module_event.c to do that:

github.com/.../aafbb215174b2b684985b413d1f49304a23d9c26