Guru Meditation Error

sita

I got an issue again with this Guru meditation error. While sending the data suddenly this error is coming, if i switch off and on the battery data is transferring normally. Because of this discontinuity i am not able to calculate the packet loss. Is there any solution for this ?

andreas

Dear @sita,

I got an issue again with this Guru meditation error.

@andreas said in Guru Meditation Error:

If core panics are still happening, I will be happy to receive respective core dumps from it. If you could share the MicroPython code it would even be better in order to reproduce the problem.

With kind regards,
Andreas.

sita

@andreas

Below is the coredump that i got in my Atom IDE for the guru meditation error.

rst:0xc (SW_CPU_RESET),boot:0x12 (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:2136
load:0x4009fa00,len:19860
entry 0x400a05d0
Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled.
Core 1 register dump:
PC      : 0x400933c3  PS      : 0x00060033  A0      : 0x80092079  A1      : 0x3ffbf060
A2      : 0x3ffbb8d8  A3      : 0x00060023  A4      : 0x3ffc44a4  A5      : 0x00000001
A6      : 0x000000fe  A7      : 0x00000000  A8      : 0x00000000  A9      : 0x3ffbb8d8
A10     : 0x3ffbb8d8  A11     : 0x00000000  A12     : 0x800fd97c  A13     : 0x3ffd79a0
A14     : 0x3f403ce4  A15     : 0x00000002  SAR     : 0x00000003  EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000004  LBEG    : 0x400ecf08  LEND    : 0x400ecf4b  LCOUNT  : 0x00000000
Core 1 was running in ISR context:
EPC1    : 0x400933c3  EPC2    : 0x00000000  EPC3    : 0x00000000  EPC4    : 0x40087b2e

Backtrace: 0x400933c3:0x3ffbf060 0x40092076:0x3ffbf080 0x40090a0d:0x3ffbf0a0 0x40089529:0x3ffbf0c0 0x40083be9:0x3ffbf100 0x400ff4ac:0x3ffd7930 0x400e6a17:0x3ffd7950 0x401014de:0x3ffd7980 0x400fd90d:0x3ffd79a0 0x400fd979:0x3ffd79c0 0x4010991b:0x3ffd79e0 0x401015d4:0x3ffd7a80 0x400fd90d:0x3ffd7ab0 0x400fd93a:0x3ffd7ad0 0x400e1aa5:0x3ffd7af0 0x400e1d35:0x3ffd7b90 0x400e0799:0x3ffd7bb0

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================= CORE DUMP END =================
E (9009) esp_core_dump: Skipped 1 tasks with bad TCB!
E (9014) esp_core_dump: Crashed task has been skipped!
Rebooting...
ets Jun  8 2016 00:22:57

I'm trying to send loraraw data packets with GPS, timestamp along with a integer( to calculate the packet loss) in them. Once the data is sent, the same will also be stored in the SD card. After no fixed amount of time, the sender module crashes with guru meditation error, but will restart itself to send the data packets. So i'm seeing a break in the integer number, which will restart from 0 after this error. The sender module code that I wrote is as follows:

import machine
import math
import network
import os
import time
import utime
import gc
import socket
import pycom
import ustruct
#from machine import RTC
from machine import SD
from L76GNSS import L76GNSS
from pytrack import Pytrack
from network import LoRa
from math import ceil

sd = SD()
os.mount(sd, '/sd')
os.listdir('/sd')

#time.sleep(2)
gc.enable()

py = Pytrack()
l76 = L76GNSS(py)

lora = LoRa(mode=LoRa.LORA, region=LoRa.EU868, frequency=433000000, power_mode=LoRa.ALWAYS_ON, tx_power=10, bandwidth=LoRa.BW_125KHZ, sf=8, preamble=8, coding_rate=LoRa.CODING_4_8)
# create a raw LoRa socket
s = socket.socket(socket.AF_LORA, socket.SOCK_RAW)


i = 0
while True:
    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] )

    #s.setblocking(True)
    value = i
    message = ''+str(lat)+','+str(lon)+','+str(timestamp)+','+str(value)
    pycom.heartbeat(True)
    s.send(message)
    i = i+ 1
    print(message)
    pycom.heartbeat(False)
    pycom.rgbled(0xff00)
    f = open('/sd/A_3001SF8.txt', 'a+')
    f.write(message)
    f.write(' ')
    f.write('\n')
    f.close()

Kindly please have a look into this issue and guide me so i can continue my work to calculate the packet loss etc., Thanks a lot in advance and have a nice day.

Best Regards,
Sita

pigamonte

I am also seeing Guru Meditation Errors with latest firmware v1.20.1.r2 and vanilla releases.
Here's just a few:

Guru Meditation Error: Core 1 panic'ed (Unhandled debug exception)
Guru Meditation Error: Core 0 panic'ed (IllegalInstruction). Exception was unhandled.
Guru Meditation Error: Core 0 panic'ed (IllegalInstruction). Exception was unhandled.

The code makes heavy use of the UARTs and runs flawlessly on desktop.

andreas

Dear @sita,

decoding the core dump shows (without guarantee):

==================== CURRENT THREAD STACK =====================
#0  0x4009192e in vTaskExitCritical (mux=0x844a) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/tasks.c:4274
#1  0x401124f0 in lora_join (n_args=1073518712, pos_args=0x3ffc990c <lora_partial_rx_packet+12>, kw_args=0x401124f0 <lora_join+16>) at mods/modlora.c:1843

======================== THREADS INFO =========================
  Id   Target Id         Frame
  16   process 15        0x4000bff0 in ?? ()
  15   process 14        xQueueCreateCountingSemaphoreStatic (uxMaxCount=1073426000, uxInitialCount=1073431200, pxStaticQueue=0x3ffb2e9c) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/queue.c:659
  14   process 13        xQueueCreateCountingSemaphoreStatic (uxMaxCount=1073495820, uxInitialCount=0, pxStaticQueue=0x3ffc3f58 <vflash_mem+1900>) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/queue.c:659
  13   process 12        xQueueCreateCountingSemaphoreStatic (uxMaxCount=1073444348, uxInitialCount=0, pxStaticQueue=0x3ffb7648) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/queue.c:659
  12   process 11        0x4000bff0 in ?? ()
  11   process 10        xQueueCreateCountingSemaphoreStatic (uxMaxCount=1073458244, uxInitialCount=1073580336, pxStaticQueue=0x3ffbac90) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/queue.c:659
  10   process 9         xQueueCreateCountingSemaphoreStatic (uxMaxCount=1073445832, uxInitialCount=0, pxStaticQueue=0x3ffb7c14) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/queue.c:659
  9    process 8         xQueueCreateCountingSemaphoreStatic (uxMaxCount=1073589088, uxInitialCount=1073603328, pxStaticQueue=0x3ffdabac) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/queue.c:659
  8    process 7         0x4000bff0 in ?? ()
  7    process 6         0x40092b55 in xTaskNotify (xTaskToNotify=0x0, ulValue=<optimized out>, eAction=<optimized out>) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/tasks.c:4872
  6    process 5         0x4009192e in vTaskExitCritical (mux=0x8484) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/tasks.c:4274
  5    process 4         xQueueCreateCountingSemaphoreStatic (uxMaxCount=1073468564, uxInitialCount=1073458080, pxStaticQueue=0x3ffbd4e0) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/queue.c:659
  4    process 3         0x40206db2 in API_vhci_host_check_send_available ()
  3    process 2         xQueueCreateCountingSemaphoreStatic (uxMaxCount=1073470132, uxInitialCount=0, pxStaticQueue=0x3ffbdb00) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/queue.c:659
  2    process 1         0x4009192e in vTaskExitCritical (mux=0x844a) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/tasks.c:4274
* 1    <main task>       0x4009192e in vTaskExitCritical (mux=0x844a) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/tasks.c:4274

So, it seems to happen while performing lora_join within mods/modlora.c.

// check for the correct lora radio mode
if (lora_obj.stack_mode != E_LORA_STACK_MODE_LORAWAN) {
    nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, mpexception_os_request_not_possible));
}

~~I assume this is some synchronization issue wrt. the code is already doing other things.~~
~~Maybe waiting for successfully joining the LoRaWAN network helps like outlined within [1] before doing other operations.~~

Forget about my last words. I believe this is wrong as I've probably used the wrong application.elf file for decoding the core dump -- see next post(s).

I just recognized you are using pure LoRa instead of LoRaWAN....

@sita said in Guru Meditation Error:

lora = LoRa(mode=LoRa.LORA, region=LoRa.EU868, frequency=433000000, power_mode=LoRa.ALWAYS_ON, tx_power=10, bandwidth=LoRa.BW_125KHZ, sf=8, preamble=8, coding_rate=LoRa.CODING_4_8)

... so who should be actually invoking lora_join anyway ;].

With kind regards,
Andreas.

P.S.: To be safe that the core dump decoding gives us the correct results: Are you using lopy4-vanilla-dragonfly-onewire or lopy4-vanilla-dragonfly-onewire-i2s?

andreas

What baffles me is that [1] shows:

// check for the correct lora radio mode
if (lora_obj.stack_mode != E_LORA_STACK_MODE_LORAWAN) {
    nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, mpexception_os_request_not_possible));
}

Drawing a conclusion from that, might it be that lora_join is not advisable when doing raw LoRa as outlined within your code

@sita said in Guru Meditation Error:

lora = LoRa(mode=LoRa.LORA, region=LoRa.EU868, frequency=433000000, power_mode=LoRa.ALWAYS_ON, tx_power=10, bandwidth=LoRa.BW_125KHZ, sf=8, preamble=8, coding_rate=LoRa.CODING_4_8)

But who is actually invoking lora_join anyway?

With kind regards,
Andreas.

[1] https://github.com/pycom/pycom-micropython-sigfox/blob/Dev/esp32/mods/modlora.c#L1841-L1844

andreas

@andreas said in Guru Meditation Error:

P.S.: To be safe that the core dump decoding gives us the correct results: Are you using lopy4-vanilla-dragonfly-onewire or lopy4-vanilla-dragonfly-onewire-i2s?

I have to admit I didn't keep track of the application.elf files coming out of my builds which are required to properly decode the core dumps. May I humbly ask you to try again using LoPy4-1.20.1.r3-0.8.0-vanilla-squirrel.tar.gz?

andreas

@andreas said in Guru Meditation Error:

P.S.: To be safe that the core dump decoding gives us the correct results: Are you using lopy4-vanilla-dragonfly-onewire or lopy4-vanilla-dragonfly-onewire-i2s?

I've tried to reproduce a corresponding application.elf file for the LoPy4-0.7.0-vanilla-dragonfly-modonewire-i2s firmware which shows the core dump is happening here:

==================== CURRENT THREAD STACK =====================
#0  0x4009192e in vTaskExitCritical (mux=0x844a) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/tasks.c:4274
#1  0x401124f0 in lora_bandwidth (n_args=<optimized out>, args=0x3ffc990c <lora_partial_rx_packet+12>) at mods/modlora.c:2117

See also [1]. I believe this is also due to a erroneous core dump decoding, so nevermind.

I have now kept the application.elf file for the new build LoPy4-1.20.1.r3-0.8.0-vanilla-squirrel.tar.gz. If you are able to catch another core dump when running this firmware, we would probably get correct results. Sorry for the extra mile.

[1] https://github.com/pycom/pycom-micropython-sigfox/blob/Dev/esp32/mods/modlora.c#L2116-L2118

andreas

Another attempt by trying to reproduce a corresponding application.elf file for the LoPy4-0.7.0-vanilla-dragonfly firmware without support for 1-Wire and I2S.

==================== CURRENT THREAD STACK =====================
#0  0x4009192e in prvAddNewTaskToReadyList (pxNewTCB=0x844a, xCoreID=1073476968, pxTaskCode=<optimized out>) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/tasks.c:1175
#1  0x401124f0 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

======================== THREADS INFO =========================
  Id   Target Id         Frame
  16   process 15        0x4000bff0 in ?? ()
  15   process 14        xQueueGenericSend (xQueue=0x3ffb2e50, pvItemToQueue=<optimized out>, xTicksToWait=4294967295, xCopyPosition=0) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/queue.c:780
  14   process 13        xQueueGenericSend (xQueue=0x3ffc3f0c <vflash_mem+1840>, pvItemToQueue=<optimized out>, xTicksToWait=4294967295, xCopyPosition=0) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/queue.c:780
  13   process 12        xQueueGenericSend (xQueue=0x3ffb75fc, pvItemToQueue=<optimized out>, xTicksToWait=4294967295, xCopyPosition=0) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/queue.c:780
  12   process 11        0x4000bff0 in ?? ()
  11   process 10        xQueueGenericSend (xQueue=0x3ffbac44, pvItemToQueue=<optimized out>, xTicksToWait=4294967295, xCopyPosition=0) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/queue.c:780
  10   process 9         xQueueGenericSend (xQueue=0x3ffb7bc8, pvItemToQueue=<optimized out>, xTicksToWait=4294967295, xCopyPosition=0) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/queue.c:780
  9    process 8         xQueueGenericSend (xQueue=0x3ffdab60, pvItemToQueue=<optimized out>, xTicksToWait=4294967295, xCopyPosition=0) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/queue.c:780
  8    process 7         0x4000bff0 in ?? ()
  7    process 6         0x40092b55 in vTaskNotifyGiveFromISR (xTaskToNotify=0x0, pxHigherPriorityTaskWoken=0x0) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/tasks.c:5044
  6    process 5         0x4009192e in prvAddNewTaskToReadyList (pxNewTCB=0x8484, xCoreID=1073476968, pxTaskCode=<optimized out>) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/tasks.c:1175
  5    process 4         xQueueGenericSend (xQueue=0x3ffbd494, pvItemToQueue=<optimized out>, xTicksToWait=100, xCopyPosition=0) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/queue.c:780
  4    process 3         0x40206db2 in littleFsErrorToErrno (littleFsError=393251) at littlefs/vfs_littlefs.c:175
  3    process 2         xQueueGenericSend (xQueue=0x3ffbdab4, pvItemToQueue=<optimized out>, xTicksToWait=4294967295, xCopyPosition=0) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/queue.c:780
  2    process 1         0x4009192e in prvAddNewTaskToReadyList (pxNewTCB=0x844a, xCoreID=1073476968, pxTaskCode=<optimized out>) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/tasks.c:1175
* 1    <main task>       0x4009192e in prvAddNewTaskToReadyList (pxNewTCB=0x844a, xCoreID=1073476968, pxTaskCode=<optimized out>) at /Users/iwahdan/esp/pycom-esp-idf/components/freertos/tasks.c:1175

Looking at

littleFsErrorToErrno (littleFsError=393251) at littlefs/vfs_littlefs.c:175

here.

andreas

@sita said in Guru Meditation Error:

while True:
  # 
  f = open('/sd/A_3001SF8.txt', 'a+')
  f.write(message)
  f.write(' ')
  f.write('\n')
  f.close()

Could you stop opening and closing the file within such a tight loop? You might want to time.sleep_ms() for at least some milliseconds between iterations. To be safe, try to use longer intervals first and get shorter if things might become more stable.

When being at it, you might also want to think about optimizing things using a single write call like f.write(message + ' \n').

sita

Hello @andreas,

Thanks for the information. I kept time.sleep_ms(10) in the loop and will change f.write as you said.I will do the the experiment again and let you know if i got same again.
Thanks once again.

Have a nice day

sita

Hello @andreas ,

I have changed the firmware to LoPy4-1.20.1.r3-0.8.0-vanilla-squirrel.tar.gz. I will do the experiment again and let you know if i got same issue again.

Thanks once again & have a nice day

sita

Hello @andreas ,

I have now flashed the latest firmware (LoPy4-1.20.1.r3-0.8.0-vanilla-squirrel.tar.gz). I got a new problem.When i try to upload my project, it gets struck while uploading the additional library files required. I attached the screenshot below.
As far i understood, it is trying to compress the library files before uploading and it gets struck with that. I haven't observed this phenomenon with earlier firmware versions. Please have a look

uploading compression.png

Thanks & Best regards,
Have a nice weekend

sita

Hello all,

I got an issue regarding uploading the project and connecting the port after updating new firmware LoPy4-1.20.1.r3-0.8.0-vanilla-squirrel.tar.gz, the respective problem screenshots shown in the below.

My doubt is, Is it related to new firmware update or any change in ATOM editor settings ??

Could anyone please suggest me how to resolve this problem ?

Uploading project (main folder)...
Safe booting device... (see settings for more info)
Safe boot failed, uploading anyway.
Upload failed: timeout. Please reboot your device manually.

Connecting to COM12...
Connection error: Error: timeout

Thanks in advance & Have a nice day

andreas

Dear @sita,

sorry to hear that this didn't work out well. While I have to admit I haven't tested the firmware on a LoPy4 device, I just compiled it like any other Dragonfly builds I have done before.

I haven't seen the error you are observing anytime before.

So, to be better safe than sorry, downgrading to any other former release from [1] might help. If it doesn't you might want to downgrade to a regular release from Pycom using the regular firmware installer.

Sorry for the hassle!

With kind regards,
Andreas.

[1] https://packages.hiveeyes.org/hiveeyes/foss/pycom/vanilla/

sita

Hello @andreas ,

I have tested my devices all the versions in the [1] but in every version i observed the Guru meditation error. Is there any permanent solution for this problem ? It would be very helpful if i know exact reason behind issue ,if you know the reason could you please let me know..

Thanks in advance & have a nice day

[1] https://packages.hiveeyes.org/hiveeyes/foss/pycom/vanilla/

andreas

Dear @sita,

just a short question: Have you been able to run your MicroPython program successfully with LoPy4-1.20.1.r3-0.8.0-vanilla-squirrel until the Guru Meditation error happened again? I am asking because it looked like you had other problems with this the other day.

With kind regards,
Andreas.

sita

Hello @andreas,

The other problems are still there, for temporarily i am running [1] in cmd so that error not coming.

[1]pycom-fwtool-cli.exe --verbose --port COM12 erase_all

andreas

Thanks. So, to make sure we are on the same page...

Invoking erase_all once before uploading a new firmware image is considered good practice. Thanks for letting me know.
After that, you are able to invoke your MicroPython program using the LoPy4-1.20.1.r3-0.8.0-vanilla-squirrel firmware?
However, Guru Meditation errors still occur?

Now, are you able to submit another core dump when running this firmware build? I have saved a local copy of lopy4-0.8.0-vanilla-squirrel.elf on my workstation in order to decode core dumps produced by this build.

sita

@andreas Now i got an issue with the atom editor :( :(
i have updated the ATOM editor evening and now i it is not showing REPL console. I will check with this and send you the core dump (LoPy4-1.20.1.r3-0.8.0-vanilla-squirrel).

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