Guru Meditation Error

[sita]

Hello all,

I am doing a project with two Lopy4's, Initially it went well but from last three weeks i am getting an error in receiver side which is shown in the below.
i have tried updating firmware but no change, Even for simple basic data transmission also getting the error.
Can any one please suggest me how to solve this issue.

Thanks in advance.

Guru Meditation Error: Core 1 panic'ed (InstrFetchProhibited)
. Exception was unhandled.
Register dump:
PC : 0x00000000 PS : 0x00060031 A0 : 0x400836f8 A1 : 0x3ffc13f0
A2 : 0x3ffc560c A3 : 0x00800000 A4 : 0x00000000 A5 : 0x00000000
A6 : 0x3ffd5b3c A7 : 0x00000060 A8 : 0x80084126 A9 : 0x00000070
A10 : 0x3ffd2b24 A11 : 0x3ffd5ba9 A12 : 0x8008ecd0 A13 : 0x3ffdafb0
A14 : 0x3ffd2b14 A15 : 0x00000004 SAR : 0x00000020 EXCCAUSE: 0x00000014
EXCVADDR: 0x00000000 LBEG : 0x4009b7bc LEND : 0x4009b7c7 LCOUNT : 0xffffffff

Backtrace: 0x00000000:0x3ffc13f0 0x400836f5:0x3ffc1410 0x4000bfed:0x00000000

================= CORE DUMP START =================
MBsAAAkAAABsAQAA
sF/9PzBe/T+oX/0/
MF79P0Bf/T+QJHaULGX9PxhR/D+wX/0/EFH8PxkAAADMX/0/zF/9P7Bf/T8AAAAA
AAAAAKxb/T9JRExFAM0WDNIA68ZKaiEAAAAAAKhf/T8AAAAAIQAGAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADEa/0/LGz9P5Rs/T8AAAAAAAAAAAEAAAAAAAAA
vmdAPwAAAAC4vQlAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGHf6w==
pDQIQJT5FEAwBAYAgMsIgPBe/T8gAAAAAQAAAAAAAAAkqfw/BFP8P6xQ/D9Aqfw/
0F79PwAAAAAAAAAAAAAAANBV/T+4GPw/IAYGAAAAAADKvgCAsF79PwAAAAAAAAAA
AAAAAJ02CEDQVf0/1NsIQLy7+T8AAAAAAAAAAAAAAAD//z+zAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAACAABgDQVf0/uBj8PyAGBgAAAAAAEF/9PwAAAAAAAAAA
AAAAAAQZ/D8EU/w/rFD8PwAAAABAX/0/AAAAAAAAAAAEGfw/AAAAAAAAAAAAAAAA
AQAAAAAAAAAEAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAExf/T8AAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==
JGX9P6Bj/T8cZf0/
oGP9P7Bk/T8ZTcqqGFH8P7hf/T8kZf0/EFH8PxkAAAApj52S1AlfACRl/T8AAAAA
AAAAACBh/T9JRExFAIoPhDLfEKL4G7cAAQAAABxl/T8AAAAAIQAGAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADEa/0/LGz9P5Rs/T8AAAAAAAAAAAEAAAAAAAAA
vmdAPwAAAAC4vQlAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAANsUWA==
pDQIQJT5FEAwAAYAgMsIgGBk/T8gAAAAAQAAACAAAAAkqfw/CFP8P6xQ/D9gqfw/
UGT9PwAAAAAjAAYAIAAGACB9/T+4GPw/IAAGAAAAAAAAAAAAnTYIQAAAAAAAAAAA
AAAAAJ02CEAgff0/1NsIQCzB+T8AAAAAAAAAAAAAAAD//z+zAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAHfLCIBgZP0/BBn8PwRT/D8AAAAAgGT9PwAAAAABAAAA
AAAAAAQZ/D8IU/w/rFD8PwAAAACwZP0/AAAAAAAAAAAEGfw/AAAAAAAAAAAAAAAA
AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAALxk/T8AAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
FGj9P+BP/T/AUf0/
4E/9P2BR/T+KAAAABFH8P9RZ/T8UaP0//FD8PwcAAAAstP0/LLT9PxRo/T8ktP0/
EgAAAMRD/T90aVQAdADaj/7nIapbWj0A////f8BR/T8AAAAAIQAGABIAAAABAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADEa/0/LGz9P5Rs/T8AAAAAAAAAAAEAAAAAAAAA
vmdAPwAAAAC4vQlAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAB9O0g==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YFj9P2BZ/T8pAAAAHGj9PwRR/D/MWf0//FD8PxQAAAAAAAAAAAAAAMxZ/T8AAAAA
BQAAAMhR/T9TZXJ2ZXJzAAAAAAAAAAAAAQAAAMRZ/T8AAAAAIQAGAAUAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADEa/0/LGz9P5Rs/T8AAAAAAAAAAAEAAAAAAAAA
vmdAPwAAAAC4vQlAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==
pDQIQPDKCEAwAAYA89INgCBZ/T8pAAAACFP8PwQZ/D8BAAAAAAD/AAAAAP/wygiA
AFn9PwEAAAApAAAAzFn9PwEAAAD+AAAAUP/6PwAAAABgWf0/AAAAADm6CUBPuglA
+////502CEABAAAA1NsIQNy1+T8AAAAAAAAAAAAAAAD//z+zAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAQFn9PwAAAAABAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAABgWf0/AAAAAAAAAAAAAAAAAQAAAMJY/D8AAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAbFn9PwAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAA=
lGb9P9B5/T8oe/0/
0Hn9P8B6/T8AAAAA8FD8P/BQ/D+UZv0/6FD8Pw8AAABgcP0/YHD9P5Rm/T9YcP0/
CgAAACxx/T9UbXIgU3ZjANm3dthIMeUAAAAAACh7/T8AAAAAIQAGAAoAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADEa/0/LGz9P5Rs/T8AAAAAAAAAAAEAAAAAAAAA
vmdAPwAAAAC4vQlAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAKcFAA==
pDQIQCXaCEAwAAYAAAAAAJB6/T8AAAAAAAAAAAAAAAAUU/w/DFP8PwkAAAAl2giA
cHr9PwAAAAAEGfw/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAJ02CEAAAAAA1NsIQDzX+T8AAAAAAAAAAAAAAAD//z+zAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAADzX+T8AAAAAAAAAAAAAAAAAAAAAwHr9PwAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAADMev0/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAA=
VEL9P8BA/T9MQv0/
wED9P+BB/T9Sl31k6Dz9Pzw3/T9UQv0/jFD8PwEAAACwb/0/sG/9P1RC/T+ob/0/
GAAAAFA+/T9pcGMxAKB1/8FpO2AE0esAAQAAAExC/T8AAAAAIQAGABgAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADEa/0/LGz9P5Rs/T8AAAAAAAAAAAEAAAAAAAAA
vmdAPwAAAAC4vQlAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAPFtsg==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4Dz9P1A7/T/YPP0/
UDv9P3A8/T9R2KeRjGn9P1xC/T/gPP0/jFD8PwEAAABYb/0/WG/9P+A8/T9Qb/0/
GAAAANw4/T9pcGMwAOMZlKA2NicS6UkAAAAAANg8/T8AAAAAIQAGABgAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADEa/0/LGz9P5Rs/T8AAAAAAAAAAAEAAAAAAAAA
vmdAPwAAAAC4vQlAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH230Q==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hGn9P6DG/T9cyP0/
oMb9P/DH/T/W5nGolFD8P+g8/T+Eaf0/jFD8PwUAAAA0tv0/NLb9P4Rp/T8stv0/
FAAAAGC8/T9ldmVudFRhc2sAMNCDKLoAAAAAAFzI/T8AAAAAIQAGABQAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADEa/0/LGz9P5Rs/T8AAAAAAAAAAAEAAAAAAAAA
vmdAPwAAAAC4vQlAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAOWJZg==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NDf9P6A1/T8sN/0/
oDX9P8A2/T/vyAjrXEL9P5RQ/D80N/0/jFD8PwMAAACUbf0/lG39PzQ3/T+Mbf0/
FgAAADAr/T9lc3BfdGltZXIAI9agme4AAAAAACw3/T8AAAAAIQAGABYAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADEa/0/LGz9P5Rs/T8AAAAAAAAAAAEAAAAAAAAA
vmdAPwAAAAC4vQlAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAALgJWg==
pDQIQKi9CEAwAAYA7SYNgGA2/T9obf0/AAAAALRt/T8AAAAAaG39PwAAAACovQiA
QDb9PwAAAAD/////BFP8PwAAAAAEGfw/IAAGAAAAAAClpaWlpaWlpQAAAAAAAAAA
AAAAAJ02CEAAAAAA1NsIQDyT+T8AAAAAAAAAAAAAAAD//z+zAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAoDb9P5RP/D8AAAAA
AAAAAAAAAAAAAAAAAAAAAP////8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAMA2/T8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAADMNv0/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAA
================= CORE DUMP END =================
E (1148) esp_core_dump: Skipped 1 tasks with bad TCB!
E (1152) esp_core_dump: Crashed task has been skipped!
Rebooting...
ets Jun 8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x17 (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:1688
load:0x4009fa00,len:0
load:0x4009fa00,len:14592
entry 0x400a059c

[Don-iot]

I just want to share my experience. I think this can happen if your power supply voltage is not sufficient. For example the device we are working on will handle most commands but when it tries to write to memory and voltage is below 3 V it will stall and output this kind of message. I have had this issue on two GPys and could replicate that the problem was solved by merely upping the voltage and rebooting the device.

[g0hww]

@peterp My implementation is quite different to that shown above and uses a home-baked Navigator class, which provides a work() method that is called in a loop from main().

It directly invokes L76GNSS._read() to consume data. Every 10 secs, when a repeating timer callback sets a flag to process the GPS data, Navigator.work() repeatedly reads a block of 256 bytes and feeds it to a temporary instance of MicropyGPS (which is always in a pristine state due to it being a single use temporary instance). Blocks of 256 bytes are fed into that MicropyGPS instance until a specific set of NMEA messages have been ingested and MicropyGPS.satellite_data_updated() returns true. It then extracts nav solution info from the MicropyGPS instance and transmits/publishes it, before clearing the flag.

Subsequent calls to Navigator.work() cause it to invoke L76GNSS._read() and discard the data, until the flag is set again by the timer callback.

I found this approach to be necessary as a backlog of data from the GPS would sometimes build up if I attempted to ingest every byte from the GPS into MicropyGPS, with MQTT publishables indicating a latency of up to 10 seconds. With this approach, I can get the current nav solution, prepare an AES-128 encrypted payload, add HMAC-MD5, send it over LoRa, receive it on another LoPy4 acting as a LoRa/MQTT bridge and publish it on MQTT within 2 seconds of the nav solution timestamp, which is pretty good IMHO.

The LoPy4 with Pytrack running this stuff is now at an uptime of 485234 secs (5 days,15 hrs) and seems to be still going strong.. The software load was new at the start of this boot cycle, so I have no prior experience with this specific configuration to indicate how long I might expect it to actually run for, but as of this time it's beaten my previous best uptime for any software load by about 2 days. I'm now preparing for the jinx effect to make it break.

UPDATE: Uptime experiment terminated due to lack of patience (and no apparent jinx effect) after 645684 (about 7.5 days) as I needed to transplant the LoPy4/Pytack into its new IP67 case.

[peterp]

@sita so, lets focus on the simplest reproduction, ie

• without L76
• without SD card

Can you try without writing the logfile? (fyi, with some of the previous panics, there were indications that it has to do with writing to flash)

[sita]

Hello @peterp,

For a clarification, i had tried all the type of experiment like

1. With L76 library
   • Transmitted only numbers (length of 1 -4 max)
   • Transmitted data (length of 3)
   • Transmitted data (length of 35)
   • Transmitted GPS (length of 25)
   • Transmitted only time (length od 10)
   • Transmitted both time & GPS (length of 35)
2. Without L76 Library
   • Transmitted only numbers (length of 1 -4 max)
   • Transmitted data (length of 3)
   • Transmitted data (length of 35)

With above all the experiments I got error. I have tried with & without SD card also. One thing is previously the frequency of error is very often. But after updating the firmware it is reduced.

[peterp]

@g0hww anything that comes to your mind what could be different with your setup?

[peterp]

@sita so let me recap and see whether I understand your reproduction.

• lopy4
• pytrack
• v1.20.2.rc3
• this script https://forum.pycom.io/topic/5560/guru-meditation-error/16
• except, do not import and use L76GNSS
• crash after 2h

That about right?
How quickly, reliable can you reproduce it WITH L76GNSS?

Could you try without sdcard, and/or without writing to logfile?

[g0hww]

My Lopy4 has been sending position info from the PyTrack GPS over LoRa every 10 seconds since startup, and has 420254.5 seconds of uptime right now. That's pretty much a record up-time for me, and I have done a lot of refactoring and simplification of my code-base recently to get this kind of stability. It also publishes info on the GPS status and node health over MQTT at the same rate. This is with FW 1.20.2.rc3. I did have quite a few issues with LoRa on previous FW versions.

[sita]

Hello @andreas,

After transmitting the data 2 hours (without L76 lib and message length 35), just now i have observed Guru meditation error.

[sita]

Hello @andreas,

So as per my opinion, these things (reading the L76 and submitting data using LoRa) effecting the device.

[andreas]

@sita said in Guru Meditation Error:

without L76 i tested the device, there is no error present

So, do you believe we can deduce from that that doing both things (reading the L76 and submitting data using LoRa) influence each other unfavourably?

That might finally be a trace we could follow up here.

[sita]

Hello @andreas,

a) The length of message is 35
b) With same length (35) message without L76 i tested the device, there is no error present.

[andreas]

@sita said in Guru Meditation Error:

If i send basic message then i didn't find any error, but if send GPS the error is still coming.

Thanks for clarifying this. While I believe there has to be some protection for that case, might it be possible that the message is just getting too long?

coord = l76.coordinates()
gps_datetime = l76.get_datetime()
lat,lon = coord

timestamp =('20' + gps_datetime[4][4] + gps_datetime[4][5]+gps_datetime[4][2] + gps_datetime[4][3]+gps_datetime[4][0] + gps_datetime[4][1]+gps_datetime[2][0] + gps_datetime[2][1]+gps_datetime[2][2] + gps_datetime[2][3]+gps_datetime[2][4] + gps_datetime[2][5] )

message = ''+str(lat)+','+str(lon)+','+str(timestamp)+','+str(value)

s.send(message)

a) Can you tell us about the final result of len(message) here?
b) Can you make up another arbitrary message of the same length (e.g. by using message = 'X' * length) without reading the L76 in order to check if both things produce the error independently from each other?

[sita]

Hello @peterp,

I am using latest firmware ( v1.20.2.rc3 ). I have tested the device different codes.
If i send basic message then i didn't find any error, but if send GPS the error is still coming.

[peterp]

Which firmware are you using now? Or let me ask it differently, can you reproduce the error with v1.20.2.rc3?

[sita]

Hello @andreas,

I am tried all the ways (like removing SD card, changing the time ..etc) still same error is continuing :( :(
Now i will test the device by sending data via TTN to check whether this error is coming in ad-hoc lora mode or not and let you know.

Thanks for your support.

Have a nice day

[andreas]

Dear @sita,

any news on your side about this issue?

With kind regards,
Andreas.

[andreas]

Dear @sita,

@ps47 also experienced similar errors like you have been observing [1]. He is also using pure LoRa. Using the most recent 1.20.2.rc3 release seems to help here [2]. Thanks @husigeza and the whole Pycom team for mitigating this issue.

I tried the new build LoPy4-1.20.2.rc3-0.8.0-vanilla-squirrel.tar.gz and not any “bad00bad bad00bad bad00bad” Core Panic happened till now.

With kind regards,
Andreas.

[1] https://forum.pycom.io/topic/5514/random-core-panic-with-lora-socket-send-recv-device-doesnt-restart-try-with-config_esp32_panic_silent_reboot
[2] https://community.hiveeyes.org/t/investigating-core-panics-on-the-lopy4/2878/29

[andreas]

Thanks @sita. This yields...

==================== CURRENT THREAD STACK =====================
#0  0x4009774e in vTaskDelay (xTicksToDelay=<optimized out>) at /home/gezahusi/Work/Repositories/pycom-esp-idf/components/freertos/tasks.c:1484
#1  0x4011338c in TASK_LoRa (pvParameters=<optimized out>) at mods/modlora.c:804

[sita]

Hello @andreas,

I have attached the core dump which is observed after a short run.

Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled.
Core 1 register dump:
PC      : 0x40098fbb  PS      : 0x00060033  A0      : 0x80097e99  A1      : 0x3ffbf0c0
A2      : 0x3ffbb95c  A3      : 0x00060023  A4      : 0x3ffc45f4  A5      : 0x00000001
A6      : 0x000000fe  A7      : 0x3f95038a  A8      : 0x00000000  A9      : 0x3ffbb95c
A10     : 0x3ffbb95c  A11     : 0x00000000  A12     : 0x8010a802  A13     : 0x3ffd8260
A14     : 0x00000001  A15     : 0x00000000  SAR     : 0x00000003  EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000004  LBEG    : 0x400ed8d0  LEND    : 0x400ed913  LCOUNT  : 0x00000000
Core 1 was running in ISR context:
EPC1    : 0x40098fbb  EPC2    : 0x00000000  EPC3    : 0x00000000  EPC4    : 0x00000000

ELF file SHA256: 0000000000000000000000000000000000000000000000000000000000000000

Backtrace: 0x40098fbb:0x3ffbf0c0 0x40097e96:0x3ffbf0e0 0x4009656d:0x3ffbf100 0x400890bb:0x3ffbf120 0x40083949:0x3ffbf160 0x400e7009:0x3ffd81f0 0x401023ba:0x3ffd8220 0x400fe7c1:0x3ffd8240 0x400fe851:0x3ffd8260 0x4010a7ff:0x3ffd8280 0x401024b0:0x3ffd8320 0x400fe7c1:0x3ffd8350 0x400fe7ee:0x3ffd8370 0x400e208d:0x3ffd8390 0x400e231d:0x3ffd8430 0x400e0d81:0x3ffd8450

================= CORE DUMP START =================
pDQAAAEAAAAQAAAAbAEAAA==
ZP39P6Ak/T+UJv0/
oCT9PzAm/T/I5AEAqEL8P6hC/D9k/f0/oEL8PxMAAAB8/f0/AAAAAGT9/T8AAAAA
BgAAAJgW/T9Mb1JhAAAAAAQAAAAAUFkAAQAAAJQm/T8AAAAAIQAGAAYAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADUZPs/PGX7P6Rl+z8AAAAAAAAAAAEAAAAAAAAA
l4dAPwAAAAD4WwlAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADD+Pw==
5DYIQE53CUAwDQYAjDMRgGAl/T/I5AEAQN37Pxgh/j8AAAAAAAAAAAAAAABOdwmA
QCX9PwEAAADI5AEAZP39PwEAAAD+AAAAEAAAAA4AAADUCfo/AAAAAE4+CUBZPglA
AAAAAOQ4CEABAAAAzIoJQNQJ+j8AAAAAAAAAAAAAAAD//z+zAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAIBB/D8BAAAA/gAAAAEAAAAAAAAAgCX9P8SZ/D9Ymvw/
GCH+PwAAAAAAAAAAAAAAAAAAAAAwJv0/AAAAAAAAAAAIAAAAAAAAAAAAAAABAAAA
AAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADkOAhAAAAAAMyKCUDUCfo/AAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAKUNQgcAAAAAAAAAAAAAAADMNkE/eAT8P1ia/D+W////
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAPCb9PwAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAA=
HLP7PyCx/T+Isv0/
ILH9PyCy/T/I5AEAlEL8P5RC/D8cs/s/jEL8PxQAAAAwOv4/MDr+Pxyz+z8AAAAA
BQAAAIyi/T9TZXJ2ZXJzAAAAAAAAAAAAAQAAAIiy/T8AAAAAIQAGAAUAAAAAAAAA
9H/7PwAAAAAAAAAAAAAAAAsAAADUZPs/PGX7P6Rl+z8AAAAAAAAAAAEAAAAAAAAA
l4dAPwAAAAD4WwlAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==
5DYIQE53CUAwDQYAyA4OgOCx/T/I5AEAQN37PwsAAAAA/wAAAAD/AAAAAP9OdwmA
wLH9PwEAAADI5AEAHLP7PwEAAAD+AAAAIwAGAAAAAADEVg+AoLH9P+BNCUD8TQlA
/////+Q4CEABAAAAzIoJQMSV+j8AAAAAAAAAAAAAAAD//z+zAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAsv0/MPj7PwAAAAAAAAAAALL9PwAAAAAAAAAA
AgAAAAD/AAAAAP8AAAAA/wAAAAAgsv0/AAAAAAAAAAAAAAAAAQAAAGpK/D8AAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAALLL9PwAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
QLn7PxC3+z84ufs/
ELf7P9C4+z9RFb1vvL77PzBC/D9Aufs/KEL8PxkAAABcufs/XLn7P0C5+z8AAAAA
AAAAADy1+z9JRExFMABWwAmj07v92E4AAAAAADi5+z8AAAAAIAcGAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAADUZPs/PGX7P6Rl+z8AAAAAAAAAAAEAAAAAAAAA
l4dAPwAAAAD4WwlAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEX5Fw==
5DYIQLBmCUAwDwYApBQXgNC3+z/ktPs/AAAAADC1+z8AAAAA5LT7PwEAAACwZgmA
sLf7PwAAAAD/////QN37PxxE/D/+AAAAqQ28PwoAAADkNghAsl4hQNDYDkAT2Q5A
AAAAAOQ4CEAcRPw/zIoJQHSc+D8AAAAAAAAAAAAAAAD//z+zAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAGC4+z8AAAAAAAAAAAAAAAAl2Q6AELj7PwEAAABAAAAA
AAAAAAPlAQAAAAAAAAAAAP////8AgAAA//8AgAoAAACguPs/AAAAANDYDkAT2Q5A
WEgPgEC4+z8AAAAAAQAAAHSc+D8Qkvw/AAAAAAAAAAAYAAAAAAAAAHTr/T8BAAAA
ZGgXgGC4+z/4kfw/AQAAAAAAAAAJAAAAAIAAAP//AIAseQmAgLj7PwAAAAABAAAA
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================= CORE DUMP END =================
Rebooting...
ets Jun  8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x17 (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:0x3fff8020,len:8
load:0x3fff8028,len:2176
load:0x4009fa00,len:19740
entry 0x400a05bc