esp-idf: [TW#27389] Core panic on OTA over BLE (Cache disabled but cached memory region accessed) (IDFGH-1685)

Environment

• Development Kit: [none]
• Module or chip used: [ESP32]
• IDF version (run git describe --tags to find it): v3.2-beta1-34-gfb7ba1b
• Build System: [Make]
• Compiler version (run xtensa-esp32-elf-gcc --version to find it): 1.22.0-80-g6c4433a5
• Operating System: [Linux]
• Power Supply: [external 3.3V]

Problem Description

I started using btstack library with esp32 and encountered a crash which happens about 1/2 times during OTA upgrade over BLE.

I am using custom board with ESP32-D0WDQ6, 4M flash and stable power supply.

Here’s the test project file: BTStackCrash.zip

Before compiling you have to extract btstack component into your esp-idf components: btstack.zip

Then it can be compiled as usual (bin and elf files are also already included). To run the OTA script, you need to have Python 3 and bluepy. Note that bluepy only supports Linux.

After the device has started, find out the device address and run the script: python3 blecontrol.py <device address> otaupgrade build/btstack-crash-test.bin

The OTA upgrade will start and sometimes esp32 will crash during the process. About 1/2 of OTA upgrades are successful.

The crash happens when the following loop is executed in cache_utils.c:

    while (!s_flash_op_complete) {
        // busy loop here and wait for the other CPU to finish flash operation
    }

The issue look similar to #1697

Debug Logs

Guru Meditation Error: Core  0 panic'ed (Cache disabled but cached memory region accessed)
Core 0 register dump:
PC      : 0x400f54bc  PS      : 0x00060534  A0      : 0x80044715  A1      : 0x3ffbe0d0  
0x400f54bc: r_lld_get_mode at ??:?

A2      : 0x00000002  A3      : 0x3ffcffc4  A4      : 0x00000001  A5      : 0x3ffcfebe  
A6      : 0x3ffcfebc  A7      : 0x00000000  A8      : 0x8004297a  A9      : 0x3ffae70c  
A10     : 0x00000000  A11     : 0x400f54bc  A12     : 0x3ff98af0  A13     : 0x00000021  
0x400f54bc: r_lld_get_mode at ??:?

A14     : 0x00000074  A15     : 0x3ffbe858  SAR     : 0x0000001e  EXCCAUSE: 0x00000007  
EXCVADDR: 0x00000000  LBEG    : 0x4000c2e0  LEND    : 0x4000c2f6  LCOUNT  : 0xffffffff  
Core 0 was running in ISR context:
EPC1    : 0x4008202f  EPC2    : 0x00000000  EPC3    : 0x00000000  EPC4    : 0x400f54bc
0x4008202f: portENTER_CRITICAL_NESTED at /home/alex/esp/esp-idf/components/freertos/port.c:403
 (inlined by) xPortInIsrContext at /home/alex/esp/esp-idf/components/freertos/port.c:338

0x400f54bc: r_lld_get_mode at ??:?


Backtrace: 0x400f54bc:0x3ffbe0d0 0x40044712:0x3ffbe110 0x40087822:0x3ffbe140 0x4008612d:0x3ffbe170 0x40086d82:0x3ffbe190 0x40087ac6:0x3ffbe1b0 0x400888ab:0x3ffbe1d0 0x400823d5:0x3ffbe1f0 0x4008334e:0x00000000
0x400f54bc: r_lld_get_mode at ??:?

0x40087822: r_lld_pdu_rx_handler at ??:?

0x4008612d: r_lld_evt_end at ??:?

0x40086d82: r_lld_evt_end_isr at ??:?

0x40087ac6: r_rwble_isr at ??:?

0x400888ab: r_rwbtdm_isr_wrapper at intc.c:?

0x400823d5: _xt_lowint1 at /home/alex/esp/esp-idf/components/freertos/xtensa_vectors.S:1105

0x4008334e: spi_flash_op_block_func at /home/alex/esp/esp-idf/components/spi_flash/cache_utils.c:81


================= CORE DUMP START =================
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================= CORE DUMP END =================
E (11888) esp_core_dump: Skipped 1 tasks with bad TCB!
E (11888) esp_core_dump: Crashed task has been skipped!
CPU halted.