Code run _thread.start_new_thread, that includes AWS MQTT causes guru meditation



  • Hi

    I have FiPy/GPY running with LTE-CAT-M1 or Wifi connections for a while.

    I wanted to look at including pybytes.

    However I find that if I run my code inside a new thread. _thread.start_new_thread
    LTE and WLAN can be setup in this thread, however as soon as I try to create an MQTT connection using the underlying AWS library I get a guru meditation error.

    Connected <WLAN>
    WDT enabled
    Connecting to mqtt
    Guru Meditation Error: Core  0 panic'ed (LoadProhibited)
    . Exception was unhandled.
    Register dump:
    PC      : 0x4008aa9d  PS      : 0x00060033  A0      : 0x4008c117  A1      : 0x3ffd54f0
    A2      : 0x3ffc513c  A3      : 0x00050023  A4      : 0x3ffc4fb4  A5      : 0x00000000
    A6      : 0x00000000  A7      : 0x00000000  A8      : 0x00000002  A9      : 0x3ffc4fac
    A10     : 0x00000000  A11     : 0x00000001  A12     : 0x3ffb7cdc  A13     : 0x00000000
    A14     : 0x00000005  A15     : 0x7fffffff  SAR     : 0x0000001f  EXCCAUSE: 0x0000001c
    EXCVADDR: 0x0000000c  LBEG    : 0x400e67e4  LEND    : 0x400e6820  LCOUNT  : 0x00000000
    
    Backtrace: 0x4008aa9d:0x3ffd54f0 0x4008c114:0x3ffd5520 0x4008c0ca:0x3ffc5ca0
    

    The AWS mqtt library creates it's own threads to handle connection and inbound messages.

    Not sure if this is a restriction of the platform or my approach.

    Thanks

    Tim



  • I have the same problem using this library or simple mqtt in another thread with version (1.18/1.19 Pybytes)

    rst:0x7 (TG0WDT_SYS_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
    configsip: 0, SPIWP:0xee
    clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
    mode:DIO, clock div:1
    load:0x3fff8028,len:8
    load:0x3fff8030,len:1984
    load:0x4009fa00,len:0
    load:0x4009fa00,len:19112
    entry 0x400a05e4
    Initializing filesystem as FatFS!
    Guru Meditation Error: Core  0 panic'ed (Cache disabled but cached memory region accessed)
    Core 0 register dump:
    PC      : 0x401f27e8  PS      : 0x00060c34  A0      : 0x8005582c  A1      : 0x3ffc0970
    A2      : 0x00000000  A3      : 0x00000001  A4      : 0x800995d1  A5      : 0x3ffea5f0
    A6      : 0x0000b030  A7      : 0x3ffea6a4  A8      : 0x8008cc86  A9      : 0x01000000
    A10     : 0x07040000  A11     : 0x00000000  A12     : 0x00000013  A13     : 0x00000000
    A14     : 0x3ffae270  A15     : 0x00000000  SAR     : 0x0000000e  EXCCAUSE: 0x00000007
    EXCVADDR: 0x00000000  LBEG    : 0x40099276  LEND    : 0x40099285  LCOUNT  : 0x00000000
    Core 0 was running in ISR context:
    EPC1    : 0x40092e5f  EPC2    : 0x00000000  EPC3    : 0x00000000  EPC4    : 0x401f27e8
    

    with the old version (1.17.3.b1 or 1.18.0) the error was different but there was.

    Connecting to MQTT broker....
    1
    2
    3
    4
    ***ERROR*** A stack overflow in task MPThread has been detected.
    abort() was called at PC 0x4008e66c on core 1
    

    the mqtt library is:
    https://github.com/yutter/micropython-mqtt

    Furthermore
    after updating to the 1.18.0 or 1.19.4.b4 to try to understand if the problem related to the threads and mqtt had been solved I had another problem, I can not load some files ...
    example of what happens that did not happen before; I added the size of the files in which I have problems

    Reading file status
    Failed to read project status, uploading all files
    Creating dir lib
    Creating dir www
    Creating dir www/bootstrap
    Creating dir www/bootstrap/css
    Creating dir www/bootstrap/fonts
    Creating dir www/bootstrap/js
    Creating dir www/js
    [1/18] Writing file SI7006A20.py
    [2/18] Writing file boot.py
    [3/18] Writing file hal.py
    [4/18] Writing file lib/mqttserver.pub.pem
    [5/18] Writing file main.py
    [6/18] Writing file mqtt.py
    [7/18] Writing file umqtt.py
    [8/18] Writing file www/bootstrap/css/bootstrap.min.css  "filesize (121.3kb)"
    Failed to write file, trying again...
    Failed to write file, trying again...
    Filecheck failed
    [9/18] Writing file www/bootstrap/js/bootstrap.min.js "filesize (36.9kb)"
    Failed to write file, trying again...
    [10/18] Writing file www/index.html
    [11/18] Writing file www/js/angular.min.js "filesize (99.0kb)"
    Failed to write file, trying again...
    Failed to write file, trying again...
    Filecheck failed
    [12/18] Writing file www/js/app.js
    [13/18] Writing file www/js/jquery-1.11.1.js "filesize (282.8kb)"
    Failed to write file, trying again...
    Failed to write file, trying again...
    Filecheck failed
    [14/18] Writing file xApp.py
    Failed to write file, trying again...
    [15/18] Writing file xConfigureFile.py
    [16/18] Writing file xHTTPConfigure.py
    [17/18] Writing file xWebServer.py
    [18/18] Writing file xWebSocket.py
    

    why?

    waiting for a quick reply
    best regards

    Giacomo


 

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