Bug: Cache disabled but cached memory region accessed

[TheRealKasumi]

I recently experienced different, randomly appearing crashes like:

Guru Meditation Error: Core  1 panic'ed (Cache disabled but cached memory region accessed). 

Core  1 register dump:
PC      : 0x4011b968  PS      : 0x00060035  A0      : 0x800814ae  A1      : 0x3ffbf1fc
A2      : 0x00000002  A3      : 0x00000001  A4      : 0xbad00bad  A5      : 0x00000000  
A6      : 0x00000006  A7      : 0x00000000  A8      : 0x8011b963  A9      : 0x3ffbf1dc  
A10     : 0x00000001  A11     : 0xffffffff  A12     : 0x000f8023  A13     : 0x00000006  
A14     : 0x007bf2a8  A15     : 0x00000000  SAR     : 0x0000000f  EXCCAUSE: 0x00000007
EXCVADDR: 0x00000000  LBEG    : 0x00000000  LEND    : 0x00000000  LCOUNT  : 0x00000000  


Backtrace:0x4011b965:0x3ffbf1fc |<-CORRUPTED

  #0  0x4011b965:0x3ffbf1fc in xPortEnterCriticalTimeoutSafe at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/freertos/port/xtensa/include/freertos/portmacro.h:590
      (inlined by) vPortEnterCriticalSafe at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/freertos/port/xtensa/include/freertos/portmacro.h:599
      (inlined by) rmt_set_tx_intr_en at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/driver/rmt.c:497

Guru Meditation Error: Core  1 panic'ed (Cache disabled but cached memory region accessed). 

Core  1 register dump:
PC      : 0x4011bae0  PS      : 0x00060035  A0      : 0x800817f2  A1      : 0x3ffbf22c  
A2      : 0x3ffc3220  A3      : 0x00000002  A4      : 0x0ffd114c  A5      : 0xfffffffe  
A6      : 0x0000001a  A7      : 0x00000008  A8      : 0x800813d5  A9      : 0x00000008  
A10     : 0x00000002  A11     : 0x00000000  A12     : 0x00000010  A13     : 0x00000000  
A14     : 0x00000003  A15     : 0x00060323  SAR     : 0x00000012  EXCCAUSE: 0x00000007  
EXCVADDR: 0x00000000  LBEG    : 0x00000000  LEND    : 0x00000000  LCOUNT  : 0x00000000  


Backtrace:0x4011badd:0x3ffbf22c |<-CORRUPTED

  #0  0x4011badd:0x3ffbf22c in rmt_set_tx_thr_intr_en at ??:?

Guru Meditation Error: Core  1 panic'ed (Cache disabled but cached memory region accessed). 

Core  1 register dump:
PC      : 0x4011b92c  PS      : 0x00060035  A0      : 0x800817f2  A1      : 0x3ffbf22c
A2      : 0x3ffc3080  A3      : 0x0028800a  A4      : 0x0ffd114c  A5      : 0xfffffffe  
A6      : 0x0000001a  A7      : 0x00000008  A8      : 0x800814ae  A9      : 0x3ffbf20c  
A10     : 0x00000002  A11     : 0x00000001  A12     : 0x3ff56ac8  A13     : 0x00000000  
A14     : 0x00000006  A15     : 0x00000000  SAR     : 0x00000007  EXCCAUSE: 0x00000007  
EXCVADDR: 0x00000000  LBEG    : 0x00000000  LEND    : 0x00000000  LCOUNT  : 0x00000000  


Backtrace:0x4011b929:0x3ffbf22c |<-CORRUPTED

  #0  0x4011b929:0x3ffbf22c in rmt_module_enable at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/driver/rmt.c:130

I have no clue at the moment, why this is happening, what exactly is causing it and how to fix it. But we need to do something about this otherwise I see the project at risk. Unfortunately, I can't provide any code that is constantly reproducing it. click. Using WiFi in STA mode seems to trigger it more frequently. Same for using the Os optimization flag. Also, it seems to be related to the rmt driver. At least it can be found in almost every stack trace.

Maybe related, but should be fixed in the meantime: espressif/esp-idf#9487

[TheRealKasumi]

Closing this issue with #141 since it potentially disapeared with the new LED driver.