unexpected and random InstrFetchProhibited errors

[Praveen.kullu]

I am developing on ESP32 dev board. I am getting instrFetchProhibited error randomly. I am unable to understand what is causing it because there is no consistent behaviour.

following image has the error message from serial log(sorry i have a photo for the moment.)

https://jpg3.su/img/Y0iio3I

i converted the backtrace information, and here is that:

/home/praveen/.espressif/tools/xtensa-esp32-elf/esp-2020r3-8.4.0/xtensa-esp32-elf/bin/xtensa-esp32-elf-addr2line -pfiaC -e ./build/firewires_sba 0xfffffffd:0x3ffe1c10 0x4009782e:0x3ffe1c30 0x40097a09:0x3ffe1d50 0x4009b48d:0x3ffe1d70 0x40099460:@x3ffe1dc0
0xfffffffd: ?? ??:0
0x4009782e: rcUpdateTxDoneAmpdu2 at ??:?
0x40097a09: rcUpdateTxDoneAmpdu2 at ??:?
0x4009b48d: rtc_clk_cpu_freq_to_xtal at /home/praveen/firewires/sba/sba-uartswitchboard-temp-dev-15/freertos/vendors/espressif/esp-idf/components/soc/src/esp32/rtc_clk.c:433
0x40099460: ppRxPkt at ??:?

this does not provide with much information, and this is the backtrace i get consistently but at random. if anyone can provide some sights on how this happens i'd appreciate it.

[Praveen.kullu]

photo as attachment..