Why does disableI2C() stalls the Raspberry Pi?

I have a Raspberry Pi 3B+ with MathWorks customized Raspbian image for R2020b. When I execute following commands, I see an error saying failed to disable I2C

>> r = raspi()

r =

raspi with properties:

DeviceAddress: '172.18.186.66'

Port: 18734

BoardName: 'Raspberry Pi 3 Model B'

AvailableLEDs: {'led0'}

AvailableDigitalPins: [2,3,4,5,6,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27]

AvailableSPIChannels: {'CE0','CE1'}

AvailableI2CBuses: {'i2c-0'}

AvailableWebcams: {'Microsoft® LifeCam Cinema(TM): (usb-3f980000.usb-1.4)'}

I2CBusSpeed: 100000

Supported peripherals

>> r.disableI2C

Failed to disable I2C peripheral.

The putty terminal shows following message and hangs.

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.460361] Internal error: Oops: 17 [#1] SMP ARM

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.460726] Process modprobe (pid: 1777, stack limit = 0x28b3d0c1)

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.460738] Stack: (0xa77e7e70 to 0xa77e8000)

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.460754] 7e60: 7f1a92c8 b6adc040 a77e7e9c a77e7e88

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.460772] 7e80: 7f1a92f8 80550c18 b9e56a10 b9e56a10 a77e7eb4 a77e7ea0 805ac594 7f1a92d4

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.460790] 7ea0: b9e56a10 b9e56a44 a77e7edc a77e7eb8 805aaed0 805ac56c 00000002 b9e56a10

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.460808] 7ec0: 7f1ab014 0167ce1c 00000081 801011c4 a77e7ef4 a77e7ee0 805aaff8 805aad54

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.460826] 7ee0: 7f1ab014 7f1ab080 a77e7f0c a77e7ef8 805a9b30 805aafa0 7f1a9db0 7f1ab014

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.460843] 7f00: a77e7f24 a77e7f10 805ab4f0 805a9ae0 7f1a9db0 80d04d48 a77e7f34 a77e7f28

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.460861] 7f20: 805ac67c 805ab4c4 a77e7f44 a77e7f38 7f1a9dc8 805ac66c a77e7fa4 a77e7f48

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.460879] 7f40: 801b5fdc 7f1a9dbc 5f633269 326d6362 00353338 801011c4 a77e6000 00000006

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.460896] 7f60: a77e7f8c 80c92ad8 80101068 7ef21a38 00000006 801011c4 a77e6000 00000006

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.460914] 7f80: 007e7fac 024286d7 80201c0c 0167cde0 0167ce1c 00000000 00000000 a77e7fa8

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.460932] 7fa0: 80101000 801b5e48 0167cde0 0167ce1c 0167ce1c 00000800 5eaf0700 00000000

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.460949] 7fc0: 0167cde0 0167ce1c 00000000 00000081 0167ce1c 0003fce8 0167cde0 7ef23ddc

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.460967] 7fe0: 0003ff88 7ef22a1c 00022bb8 76c37fcc 20000010 0167ce1c 00000000 00000000

Message from syslogd@raspberrypi-0kU9Oq4mxq at Sep 10 05:53:00 ...

kernel:[10881.461317] Code: e8bd4000 e2504000 089da818 ebfff6c8 (e5943014)

Upon ctrl+c or executing cmd sudo reboot in pi terminal the Pi doesn't reboot successfully and creating a new ssh stalls. This issue is resolved upon power cycling the board

Answer 1

[MathWorks MATLAB Hardware Team]

This is due to the upstream Linux issue for BCM 2835 based devices. This issue has been reported in following Raspberry Pi forum

https://www.raspberrypi.org/forums/viewtopic.php?t=255294

Due to issue being present in Linux kernel, it is seen in MathWorks customized Raspbian image for R2020b

Do following steps to resolve the issue:

1. Create raspi object in MATLAB

>> r = raspi()

2. Open terminal of the pi using

>> r.openShell();

3. In the terminal window execute $ sudo raspi-config

4. Go to Interface Options, select I2C and select No to disable the I2C peripheral.