Crash: PCB must be deallocated outside this function

[fsergeys]

When I do FTP transfers sometimes (at irregular intervals) I get this crash.
I have noticed other spontaneous reboots of the system (not using FTP) but could never catch the core dump and I never found errors in my logs neither although every piece of code is inside a try except finally. So I don't know whether they are related.

This is the error I get with the FTP:
assertion "PCB must be deallocated outside this function" failed: file "/Users/danicampora/Code/Espressif/IDF/esp-idf-20180112/comERROR A stack overflow in task Servers has been detected.
abort() was called at PC 0x4008d1cc on core 1

Backtrace: 0x4008d183:0x3ffd32d0 0x4008d1b4:0x3ffd32f0 0x4008d1cc:0x3ffd3310 0x4008a79d:0x3ffd3330 0x4008be38:0x3ffd3360 0x4008bdee:0x00000000

The system is:
(sysname='WiPy', nodename='WiPy', release='1.15.0.b1', version='v1.8.6-849-baa8c33 on 2018-01-29', machine='WiPy with ESP32')

I can give you the entire core dump too.

[livius]

@fsergeys said in Crash: PCB must be deallocated outside this function:

'1.15.0.b1'

is there any particular reason that you use old firmware?
current one is 1.17.3.b1
update firmware and look if your problem persist.

[fsergeys]

@livius Euh, no. I haven't upgraded the firmware since januari when I first installed the devices. And I thought I used the latest version at that time. Need to check whether I missed something.

[fsergeys]

Crash persists after upgrade firmware
(sysname='WiPy', nodename='WiPy', release='1.17.3.b1', version='v1.8.6-849-83e2f7f on 2018-03-19', machine='WiPy with ESP32')

assertion "PCB must be deallocated outside this function" failed: file "/Users/danicampora/Code/Espressif/IDF/esp-idf-20180112/componentERROR A stack overflow in task Servers has been detected.
abort() was called at PC 0x4008d4a8 on core 1

Backtrace: 0x4008d45f:0x3ffd3770 0x4008d490:0x3ffd3790 0x4008d4a8:0x3ffd37b0 0x4008aa41:0x3ffd37d0 0x4008c114:0x3ffd3800 0x4008c0ca:0x00000000

[fsergeys]

anyone?
This crash more or less renders my pycom boards useless as any data I capture, I can't FTP to the server for analysis ...

[fsergeys]

the entire core dump:

assertion "PCB must be deallocated outside this function" failed: file "/Users/danicampora/Code/Espressif/IDF/esp-idf-20180112/component***ERROR*** A stack overflow in task Servers has been detected.
abort() was called at PC 0x4008d4a8 on core 1

Backtrace: 0x4008d45f:0x3ffd3770 0x4008d490:0x3ffd3790 0x4008d4a8:0x3ffd37b0 0x4008aa41:0x3ffd37d0 0x4008c114:0x3ffd3800 0x4008c0ca:0x00000000

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

[robert-hh]

@fsergeys How do you use FTP. Are you useing the server on the device, which is connected by a remote client, or do you use a (python coded) ftp client, which connects to a sever,?

[fsergeys]

@robert-hh
Filezilla cliënt or FTP cliënt in a cron scheduled Task Connecting to the FTP server on the device.

[robert-hh]

@fsergeys Could it be that there a problem with the concurrent access of writing and reading? Does the core dump also happen when you do no FTP access? You tell that it does not. Then you may consider another method for data transfer, which is initiated by the WiPy. I used a ftplib once for a ftp client, but that may be too bulky, unless you embed it as frozen bytecode. that will give you better control on the times of data exchange. As far as I recall, it was the esp8266 version of this variant: https://github.com/SpotlightKid/micropython-ftplib

[fsergeys]

@robert-hh
Concurrent access was my first idea too.
To test it: I erased the flash to standard boot and main. Then I preloaded the SD with data. Re-ran the FTP test and it still had the same crashes.
Using the FTP server on the device is for me is the easiest way.
Otherwise I would need to create a Timer to upload data at regular intervals. To keep data transfer low I would need keep the intervals long avoiding me to have the flexibility of choosing which data I want to download and when.
To be honest, I'm a bit disappointed by the eagerness of pycom to attack this problem.
The same with my other crash report.