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pycom / pycom-micropython-sigfox

A fork of MicroPython with the ESP32 port customized to run on Pycom's IoT multi-network modules.
MIT License
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Lopy4 unable to start WLAN.AP - Guru Meditation error: core 0 panic'ed (instrfetchprohibited) #314

Open SalomonHenao opened 5 years ago

SalomonHenao commented 5 years ago

Hello everyone,

I'm using a Lopy4 board. Firmware: (sysname='LoPy4', nodename='LoPy4', release='1.18.2.r7', version='v1.8.6-849-df9f237 on 2019-05-14', machine='LoPy4 with ESP32', lorawan='1.0.2', sigfox='1.0.1')

I have more than 8 Lopy4 with the same problem. The boards are getting damaged, and I can't realize the reason yet.

  1. The problem is that when trying to start the WLAN Access Point the board crashes and prints the "Guru Meditation error: core 0 panic'ed (instrfetchprohibited)" error.
  2. I thought that it was because of any wrong line on my code, so I deleted everything from the boards and even updated the pycom firmware to the last version in order to fix them, but the boards are still crashing.
  3. Lopy4 launches the WLAN.AP by default on boot, so with this problem the boards are unusefull because they fall in to a loop in which they reboot all the time.
  4. In order to recover the boards, I had to become creative to achieve running "wifi_on_boot(False)" before they reboot, so they quit crashing because they are not launching the WLAN.AP on boot.
  5. It's difficult to diagnose because some times the rebooting happens inmediatelly, while in others it takes some time to crash... WITHOUT MOVING ANYTHING OR RUNNING ANY LINE!

Any idea? Hope you do. Thanks!

iwahdan88 commented 5 years ago

Hello , can you send the crash log for investigation?

SalomonHenao commented 5 years ago

Hello , can you send the crash log for investigation?

Sure!

Here... This is the log of a Lopy4 which is empty. I've only run the "wifi_on_boot(True)" command and rebooted manually to get it:

Guru Meditation Error: Core 0 panic'ed (InstrFetchProhibited) . Exception was unhandled. Register dump: PC : 0x00000000 PS : 0x00060430 A0 : 0x80118f25 A1 : 0x3ffbd650 A2 : 0x00000000 A3 : 0x00000037 A4 : 0xffffffb7 A5 : 0x3fbc0af4 A6 : 0x00000008 A7 : 0x00060023 A8 : 0x801241f8 A9 : 0x3ffbd640 A10 : 0x3fbc0b10 A11 : 0x00000037 A12 : 0xffffffb7 A13 : 0x3ffbd6e4 A14 : 0x7777e18c A15 : 0x7777e18c SAR : 0x00000010 EXCCAUSE: 0x00000014 EXCVADDR: 0x00000000 LBEG : 0x4009b67d LEND : 0x4009b6b1 LCOUNT : 0xffffffff

Backtrace: 0x00000000:0x3ffbd650 0x40118f22:0x3ffbd670 0x40119f2f:0x3ffbd740 0x401304c5:0x3ffbd760 0x40132027:0x3ffbd7b0

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================= Rebooting...

johandse commented 5 years ago

This issue have been discussed in the forum multiple times: https://forum.pycom.io/topic/4342/guru-meditation-error-magnetic-interference-emi-rfi https://forum.pycom.io/topic/3892/my-new-gpy-keeps-core-dumping https://forum.pycom.io/topic/3217/lopy4-guru-meditation-error https://forum.pycom.io/topic/5177/frequency-disturbance-causing-my-pycom-modules-to-crash

This happens when in reach of some WIFI access points.

SalomonHenao commented 5 years ago

This issue have been discussed in the forum multiple times: https://forum.pycom.io/topic/4342/guru-meditation-error-magnetic-interference-emi-rfi https://forum.pycom.io/topic/3892/my-new-gpy-keeps-core-dumping https://forum.pycom.io/topic/3217/lopy4-guru-meditation-error https://forum.pycom.io/topic/5177/frequency-disturbance-causing-my-pycom-modules-to-crash

This happens when in reach of some WIFI access points.

Hi Johandse, thank you for your answer. According to that, there is nothing to do in order to solve this issue?

johandse commented 5 years ago

Not that I am aware of. I "solved" the problem by disabling WIFI becuase I didn´t need that for my application.

amotl commented 4 years ago

Dear @SalomonHenao and @johandse,

if you feel lucky, you might want to try our custom build just released on [1]. More background about this is available through [2].

If we are lucky together, this will improve the stability significantly. If you will be still receiving the core dumps, I will be happy if you would share its content with us. Please just don't paste it into the comment itself but put it into a file which you will be able to upload by dragging it into the text area.

Please be aware that you will have to erase your device completely before flashing in order to keep things straight. You will find respective references to this on the forum. Hint: Use pycom-fwtool-cli --port /dev/ttyUSB0 erase_all, see also [3].

Please also be aware that this procedure will also erase the LoRa MAC stored on the device. @robert-hh thankfully outlined the procedure to restore it appropriately:

  • If you still know the value the LoraMac had before, then you can follow the procedure explained at https://forum.pycom.io/topic/1272/lora-mac-ffffffffffffffff/21.
  • If you do not know it, you will have to use the Pycom updater to restore it:
    • First, use the Pycom updater (GUI version) to install a recent image (like pybytes 1.20.1) from the Internet. You do not have to use it, the installation process itself already restores both the LoRa MAC and the Sigfox ID.
    • Then, use the Pycom updater to flash the custom image. Do not erase the flash in between.

As it turned out to gain more robustness for others already [4,5], we will be happy to learn if this happens to you as well.

With kind regards, Andreas.

[1] https://packages.hiveeyes.org/hiveeyes/foss/pycom/vanilla/LoPy4-1.20.1.r1-0.6.0-vanilla-dragonfly.tar.gz [2] https://community.hiveeyes.org/t/investigating-random-core-panics-on-pycom-esp32-devices/2480 [3] https://community.hiveeyes.org/t/installing-the-recent-pycom-firmware-1-20-1-r1-requires-erasing-the-flash-memory-completely/2688 [4] https://community.hiveeyes.org/t/testing-the-custom-dragonfly-builds-on-pycom-devices/2746 [5] https://github.com/pycom/pycom-micropython-sigfox/issues/361#issuecomment-553399627

amotl commented 4 years ago

Hi there,

several people have been able to mitigate similar issues with one of our custom/unofficial Dragonfly builds based on Pycom’s 1.20.1.r1 [1] as mentioned above. We've refreshed this the other day and published corresponding Squirrel builds based on Pycom’s most recent 1.20.2.rc3 [2].

If you are lucky to try this build, we will be happy to hear about the outcome for you.

When upgrading from earlier releases like 1.18.2.r7, please read both the installation instructions and the notes for LoPy, LoPy4, SiPy and FiPy devices carefully, a) regarding the erase_all procedure and b) for restoring the Lora MAC after the erase_all procedure.

With kind regards, Andreas.

[1] https://community.hiveeyes.org/t/dragonfly-firmware-for-pycom-esp32/2746 [2] https://community.hiveeyes.org/t/squirrel-firmware-for-pycom-esp32/2960