2.5.0 SPIFFS fatal crash with Illegal Instruction on call to millis() within interrupt handler

[ks12]

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.
• [ x] If there is a stack dump, I have decoded it.
• [ x] I have filled out all fields below.

Platform

• Hardware: ESP 12E on Nodemcu 1.0
• Core Version: 2.5.0
• Development Env: Arduino IDE
• Operating System: Windows

Settings in IDE

• Module: Nodemcu
• Flash Mode: qio
• Flash Size: 4MB/1MB]
• lwip Variant: v2 Higher Bandwidth (no features)
• Reset Method: --
• Flash Frequency: --
• CPU Frequency: 80Mhz
• Upload Using: OTA
• Upload Speed: --

Problem Description

In 2.5.0 core, I am facing recurrent ESP crashes at the millis() line of the code:

void doCnt() // This is an interrupt handler function
{
if ((millis() - CntLMillis) > cntBounce) // << This line of code
{
CntLMillis = millis();
checkCnt = true;
}
}

The crash decode shows that its a Fatal Exception 0 - Illegal Command.
millis() is the only command on that line.
The stack shows a lot of SPIFFS activity then a esp_yield and then this crash.

I think it has something to do with interrupt handling along with SPIFFS activity. I cannot stop my interrupt captures during SPIFFS writes, due to application requirements.

I upgraded from the 2.4.2 core to 2.5.0.
My same sketch was very stable in the older core.

After I shifted to the older code, things are stable again.

[devyte]

The issue template requires a MCVE sketch to reproduce the issue. Without that, it is unlikely this will be looked at.
Please provide a minimal sketch.

[faparo]

Hi devyte, i have the same problem. From one day to the next my sketch stopped working.
The description of the cause is the same as described by ks12:

"Fatal Exception 0 - Illegal Command.
millis() is the only command on that line.
The stack shows a lot of SPIFFS activity then a esp_yield and then this crash.".

If, within my sketch, I comment SPIFFS.begin () the program does not crash, the FS also stops working too.
I´m using Platformio/arduino IDE.
I´m new in this, veryyyy new but if you explain to me that it is an "MCVE sketch",
I promise to help to the best of my ability.

[faparo]

Hi devyte, it´s me again.
i found it "MCVE sketch: Minimial Complete Verifiable Example."
i will try to provide you the MCVE.

[laercionit]

I have the same problem.

[earlephilhower]

The bug has been oven for >6 months and no MCVE or even a decoded stack trace are available. There's nothing we can look at here. Closing.