Guru meditation error

[fsergeys]

At random intervals I notice that my wipy/pytrack board reboots. I finally managed to get the core dump (this is another core dump than the one I posted yesterday when doing FTP)
The error I get is below.
How do I interpret this to find where the problem is in my code?

Guru Meditation Error: Core  1 panic'ed (Unhandled debug exception)
Debug exception reason: BREAK instr
Register dump:
PC      : 0x400803c0  PS      : 0x00060036  A0      : 0x00000000  A1      : 0x3ffe94d0
A2      : 0x3ffe972c  A3      : 0x3ffdd82c  A4      : 0x00000000  A5      : 0x0000ff00
A6      : 0x00ff0000  A7      : 0xff000000  A8      : 0x00060023  A9      : 0x00000000
A10     : 0x00000004  A11     : 0x7fffffff  A12     : 0x80089c57  A13     : 0x3ffd93d0
A14     : 0x00000003  A15     : 0x00060023  SAR     : 0x0000001e  EXCCAUSE: 0x00000001
EXCVADDR: 0xffffffd0  LBEG    : 0x40099934  LEND    : 0x40099962  LCOUNT  : 0x00000000

Backtrace: 0x400803c0:0x3ffe94d0 0x7ffffffd:0x00000000

Also, after rebooting: the main.py seems not to work anymore

Unhandled exception in callback handler
Traceback (most recent call last):
  File "main.py", line 370, in launchWriters
NameError: name 'dispatcher' is not defined

If I reset the board (via the button), It starts up again and runs normally until the next random crash (sometime a few minutes later, sometimes hours later).

I can provide the entire core dump

system: (sysname='WiPy', nodename='WiPy', release='1.17.3.b1', version='v1.8.6-849-83e2f7f on 2018-03-19', machine='WiPy with ESP32')

[fsergeys]

anyone?
any tip to get me further is welcome.

[seb]

@fsergeys

Can you post the complete core dump so we can decode and discover where the error is coming from?

[fsergeys]

@seb

Guru Meditation Error: Core  1 panic'ed (Unhandled debug exception)
Debug exception reason: BREAK instr
Register dump:
PC      : 0x400803c0  PS      : 0x00060036  A0      : 0x00000000  A1      : 0x3ffe94d0
A2      : 0x3ffe972c  A3      : 0x3ffdd82c  A4      : 0x00000000  A5      : 0x0000ff00
A6      : 0x00ff0000  A7      : 0xff000000  A8      : 0x00060023  A9      : 0x00000000
A10     : 0x00000004  A11     : 0x7fffffff  A12     : 0x80089c57  A13     : 0x3ffd93d0
A14     : 0x00000003  A15     : 0x00060023  SAR     : 0x0000001e  EXCCAUSE: 0x00000001
EXCVADDR: 0xffffffd0  LBEG    : 0x40099934  LEND    : 0x40099962  LCOUNT  : 0x00000000

Backtrace: 0x400803c0:0x3ffe94d0 0x7ffffffd:0x00000000

================= CORE DUMP START =================
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================= CORE DUMP END =================
Rebooting...

[fsergeys]

@seb
Found anything interesting?
Is there a good resource that explains how I can decode it myself. This is something I haven't done before.

[AJMansfield]

I'm getting a very similar issue, at least for me it appears to be an issue with multi-threaded code. I've tried writing my code both with and without threading and I only have this issue on the threaded version.

I'll try to put together an MCVE if I have time so that hopefully this can get fixed.

[VST Admin]

Why is it that admins and official tech support @ pycom never really answer these questions? Do they not understand that many people get these same problems and then leave in disgust and eventually abandon their projects or find another chip? Or do they just not care?

[Gijs]

Hi,
Im sorry if I accidentally ignored your coredump post. You notice that this post is from 2018 and that there is no added value in solving this issue anymore right?

Now, let me start by mentioning it is never okay for the controller to present a coredump and they should be avoided at all costs.

The issue with these coredumps is that they can have a variety of reasons, and that debugging them takes a lot of effort, as I need to know the exact firmware version used (incl development board version), the coredump parameters (top section) and it is very useful to see the python code and learn about its workings and when it breaks (if it breaks at the same location every time). Even then, it is still a wild goose chase. There can be many reasons for a coredump (including inadequate power supply, incorrect use of threading, firmware errors etc.)

What we can do, is provide you with better tools to research the coredump and I will be working on that. Note that I have already started a documentation page here: https://docs.pycom.io/advance/coredump/, but I want to do better. Please let me know how we can improve the situation!

Best,
Gijs