Irremoteesp8266: ESP32 crashes with Guru Meditation Error: Core 1 panic'ed (Cache disabled but cached memory region accessed)

[Jueff]

Version/revision of the library used

name=IRremoteESP8266
version=2.7.13
platform=ESP32

Error behavior

In case IRReceive is initialized (interrupts enabled) the ESP32 is crashing in case a SPI flash access is active and an IRReceive interrupt occurs.
To reproduce this problem I took the IRrecvDemo sample and added some code, that access the SPI flash.
Start the program and see that it will crash after some seconds.

Suggestion: the function
static void USE_IRAM_ATTR gpio_intr()
is marked with the IRAM_ATTR, so the code will run as a copy in memory. But this function calls

  timerWrite(timer, 0);  // Reset the timeout.
  timerAlarmEnable(timer);

which are both functions not marked with IRAM_ATTR.

I tried to remove this two line, then no exception occurs. But then the receive also doesn't work anymore.

Console output

IRrecvDemo is now running and waiting for IR message on Pin 22
Guru Meditation Error: Core  1 panic'ed (Cache disabled but cached memory region accessed)
Core 1 register dump:
PC      : 0x400f8fc4  PS      : 0x00060034  A0      : 0x80080f94  A1      : 0x3ffbe790  
A2      : 0x3ffc017c  A3      : 0x3ffb94f4  A4      : 0x80086959  A5      : 0x3ffb1b50  
A6      : 0x00000026  A7      : 0x3ffc16e4  A8      : 0x80080f19  A9      : 0x00000001  
A10     : 0x3ffbec20  A11     : 0x00000002  A12     : 0x00000000  A13     : 0x00000000  
A14     : 0x00000020  A15     : 0xffffffff  SAR     : 0x00000011  EXCCAUSE: 0x00000007  
EXCVADDR: 0x00000000  LBEG    : 0x4000c2e0  LEND    : 0x4000c2f6  LCOUNT  : 0x00000000  
Core 1 was running in ISR context:
EPC1    : 0x40086f80  EPC2    : 0x00000000  EPC3    : 0x00000000  EPC4    : 0x400f8fc4

Backtrace: 0x400f8fc4:0x3ffbe790 0x40080f91:0x3ffbe7b0 0x40084751:0x3ffbe7d0 0x40086f7d:0x3ffb1b90 0x400f7b52:0x3ffb1c00 0x400e05c9:0x3ffb1c30 0x400e07ff:0x3ffb1c60 0x400e1d6b:0x3ffb1c90 0x400e38e6:0x3ffb1cd0 0x400e01b4:0x3ffb1d10 0x400deefc:0x3ffb1d40 0x400e7665:0x3ffb1da0 0x4000bcc5:0x3ffb1dc0 0x400e89c1:0x3ffb1de0 0x400d932f:0x3ffb1e00 0x400d967f:0x3ffb1e30 0x400d9959:0x3ffb1e70 0x400d906f:0x3ffb1ef0 0x400d12b5:0x3ffb1f20 0x400d139e:0x3ffb1f90 0x400da84d:0x3ffb1fb0 0x40088379:0x3ffb1fd0

### Stack trace
PC: 0x400f8fc4: timerWrite at C:\Users\AnonymousUser\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\cores\esp32\esp32-hal-timer.c line 106
EXCVADDR: 0x00000000

Decoding stack results
0x400f8fc4: timerWrite at C:\Users\AnonymousUser\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\cores\esp32\esp32-hal-timer.c line 106
0x40080f91: __onPinInterrupt at C:\Users\AnonymousUser\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\cores\esp32\esp32-hal-gpio.c line 220
0x40086f7d: spi_flash_read at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/spi_flash/flash_ops.c line 565
0x400f7b52: esp_partition_read at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/spi_flash/partition.c line 242
0x400e05c9: spiffs_api_read at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/spiffs/spiffs_api.c line 36
0x400e07ff: spiffs_phys_rd at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/spiffs/spiffs/src/spiffs_cache.c line 161
0x400e1d6b: spiffs_obj_lu_find_entry_visitor at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/spiffs/spiffs/src/spiffs_nucleus.c line 166
0x400e38e6: spiffs_object_find_object_index_header_by_name at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/spiffs/spiffs/src/spiffs_nucleus.c line 1694
0x400e01b4: SPIFFS_stat at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/spiffs/spiffs/src/spiffs_hydrogen.c line 765
0x400deefc: vfs_spiffs_stat at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/spiffs/esp_spiffs.c line 536
0x400e7665: esp_vfs_stat at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/vfs/vfs.c line 492
0x400e89c1: stat at ../../../.././newlib/libc/syscalls/sysstat.c line 12
0x400d932f: VFSFileImpl::VFSFileImpl(VFSImpl*, char const*, char const*) at C:\Users\AnonymousUser\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\libraries\FS\src\vfs_api.cpp line 232
0x400d967f: std::__shared_ptr ::__shared_ptr  , VFSImpl*&, char const*, char const*&>(std::_Sp_make_shared_tag, std::allocator  const&, VFSImpl*&, char const*&&, char const*&) at c:\users\AnonymousUser\appdata\local\arduino15\packages\esp32\tools\xtensa-esp32-elf-gcc\1.22.0-80-g6c4433a-5.2.0\xtensa-esp32-elf\include\c++\5.2.0\ext/new_allocator.h line 120
0x400d9959: VFSImpl::open(char const*, char const*) at c:\users\AnonymousUser\appdata\local\arduino15\packages\esp32\tools\xtensa-esp32-elf-gcc\1.22.0-80-g6c4433a-5.2.0\xtensa-esp32-elf\include\c++\5.2.0\bits/shared_ptr.h line 319
0x400d906f: fs::FS::open(char const*, char const*) at C:\Users\AnonymousUser\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\libraries\FS\src\FS.cpp line 191
0x400d12b5: ListFiles() at C:\Users\JRGEN~1\AppData\Local\Temp\arduino_modified_sketch_874785/IRrecvDemo.ino line 66
0x400d139e: loop() at C:\Users\JRGEN~1\AppData\Local\Temp\arduino_modified_sketch_874785/IRrecvDemo.ino line 61
0x400da84d: loopTask(void*) at C:\Users\AnonymousUser\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\cores\esp32\main.cpp line 19
0x40088379: vPortTaskWrapper at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/port.c line 143

Example code used

/*
 * IRremoteESP8266: IRrecvDemo - demonstrates receiving IR codes with IRrecv
 * This is very simple teaching code to show you how to use the library.
 * If you are trying to decode your Infra-Red remote(s) for later replay,
 * use the IRrecvDumpV2.ino (or later) example code instead of this.
 * An IR detector/demodulator must be connected to the input kRecvPin.
 * Copyright 2009 Ken Shirriff, http://arcfn.com
 * Example circuit diagram:
 *  https://github.com/crankyoldgit/IRremoteESP8266/wiki#ir-receiving
 * Changes:
 *   Version 0.2 June, 2017
 *     Changed GPIO pin to the same as other examples.
 *     Used our own method for printing a uint64_t.
 *     Changed the baud rate to 115200.
 *   Version 0.1 Sept, 2015
 *     Based on Ken Shirriff's IrsendDemo Version 0.1 July, 2009
 */

#include <Arduino.h>
#include <IRremoteESP8266.h>
#include <IRrecv.h>
#include <IRutils.h>

// An IR detector/demodulator is connected to GPIO pin 14(D5 on a NodeMCU
// board).
// Note: GPIO 16 won't work on the ESP8266 as it does not have interrupts.
const uint16_t kRecvPin = SCL;

IRrecv irrecv(kRecvPin);
decode_results results;

TaskHandle_t  TaskHnd ;
void SecondTask(void* parameter);

#include "SPIFFS.h"

void setup() {
  Serial.begin(115200);
  irrecv.enableIRIn();  // Start the receiver
  while (!Serial)  // Wait for the serial connection to be establised.
    delay(50);
  Serial.println();
  Serial.print("IRrecvDemo is now running and waiting for IR message on Pin ");
  Serial.println(kRecvPin);
  //xTaskCreatePinnedToCore(SecondTask,"Second",4096,NULL,1,&TaskHnd,0);
    if (!SPIFFS.begin(true)) {
    Serial.println("An Error has occurred while mounting SPIFFS");
    return;
  }

}

void loop() {
  if (irrecv.decode(&results)) {
    // print() & println() can't handle printing long longs. (uint64_t)
    serialPrintUint64(results.value, HEX);
    Serial.println("");
    irrecv.resume();  // Receive the next value
  }
  delay(100);
  ListFiles();
}


void ListFiles() {
    File root = SPIFFS.open("/");
    File file = root.openNextFile();

    while(file){
       Serial.print("FILE: ");
       Serial.println(file.name());
       file = root.openNextFile();
    }
}

I have followed the steps in the Troubleshooting Guide & read the FAQ

yes, had a look there, didn't find this issue.

Has this library/code previously worked as expected for you?

no

Other useful information

[crankyoldgit]

Thanks for the report. Your info is really helpful. This might be a tricky fix, as we really do need those functions in the interrupt, thus Iram.

[crankyoldgit]

Note to self:
In theory, if I replace those functions with:

https://github.com/espressif/arduino-esp32/blob/6b0114366baf986c155e8173ab7c22bc0c5fcedc/cores/esp32/esp32-hal-timer.c#L107-L109

&

https://github.com/espressif/arduino-esp32/blob/6b0114366baf986c155e8173ab7c22bc0c5fcedc/cores/esp32/esp32-hal-timer.c#L177

It will probably work.

[Jueff]

good idea, may work.
another issue which is a quick fix - the definition of
static ETSTimer timer;
static hw_timer_t * timer = NULL;
defines the variable timer at global scope. I already had an overlap with another library, I would suggest to use a more specific name for the variable, e.g. irremote_timer.

[crankyoldgit]

Good suggestion. I'll change it and see if I can namespace/scoping it.

[crankyoldgit]

Hey @Jueff I think I've got a workaround (I'm not sure I like calling it a fix) for your issue.

Can you please download and try out the code in branch: https://github.com/crankyoldgit/IRremoteESP8266/tree/Issue1350 and let me know how it goes?

[crankyoldgit]

ping.

[Jueff]

pong :-)
just starting to test

[crankyoldgit]

How did your testing go?

[Jueff]

Testing is complete, no more crashes.

[crankyoldgit]

Huzzah!