ESP8266 stuck in fatal exception (3)

[patiphan]

I found my esp8266 stuck in fatal exception (3) and below is the log message when in the boot process. (Baud rate = 74880)

It looks like the MCU can't run my code. It happened unexpectedly despite previously being able to function normally.

boot_log.png (39.28 KiB) Viewed 5274 times

[arjen1]

I'm afraid no one can help you with the little info you provide. If you changed nothing, it used to work, and suddenly shows this behaviour, you might check the connections to the board and peripherals you have. I've had the same and it took me days to find out that the power supply cable now and then disconnected from the board. The connector was too loose.

If you did change something in your code, then the suspect is in that new code.

[rin67630]

You could have got a memory overflow with your internal data growing...

[patiphan]

Now, I found a way to make this problem happen. I curious about "make first break last" when uploading firmware to my board. So I do an experiment by holding plug in 3.3V to my board and plug in/out GND repeatedly and see boot message. I've been doing this for a while and finally ESP8266 begin to stuck in fatal exception (3) as seen in the above image. Can anyone explain me why ? What happen in the background circuit ?