Iterating GPIOs crashes on Raspberry Pi 4B #104

KevinVitale · 2020-06-05T17:52:44Z

Board Type

RaspberryPi3B+,
RaspberryPi4 8GB

Operating System

Ubuntu Server 18.04

Swift Version

Swift 5.2.4 v4

Description

Wrote a program to iterate over GPIOs:

import SwiftyGPIO

let gpios = SwiftyGPIO.GPIOs(for: .RaspberryPi3)
gpios
  .compactMap({ $0 })
  .forEach { print($0) }

When I run this on RPi 3B+, it works without a problem:

➜  PiTest sudo swift run
(key: SwiftyGPIO.GPIOName.P26, value: GPIO26<OUT,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P21, value: GPIO21<IN,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P10, value: GPIO10<OUT,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P23, value: GPIO23<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P12, value: GPIO12<IN,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P15, value: GPIO15<OUT,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P19, value: GPIO19<OUT,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P14, value: GPIO14<OUT,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P7, value: GPIO7<OUT,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P6, value: GPIO6<OUT,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P11, value: GPIO11<OUT,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P5, value: GPIO5<IN,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P18, value: GPIO18<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P9, value: GPIO9<OUT,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P27, value: GPIO27<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P3, value: GPIO3<OUT,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P17, value: GPIO17<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P22, value: GPIO22<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P24, value: GPIO24<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P20, value: GPIO20<IN,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P4, value: GPIO4<IN,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P8, value: GPIO8<OUT,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P25, value: GPIO25<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P13, value: GPIO13<OUT,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P16, value: GPIO16<IN,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P2, value: GPIO2<OUT,NONE,true>: 1)

When I run this on RPi 4, it iterates a few, then crashes with a nil exception:

➜  PiTest sudo swift run
(key: SwiftyGPIO.GPIOName.P25, value: GPIO25<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P13, value: GPIO13<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P18, value: GPIO18<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P27, value: GPIO27<IN,NONE,true>: 0)
Fatal error: Unexpectedly found nil while unwrapping an Optional value: file /home/ubuntu/Swift/PiTest/.build/checkouts/SwiftyGPIO/Sources/SwiftyGPIO.swift, line 73
Current stack trace:
0    libswiftCore.so                    0x0000ffff7f9cce4c swift_reportError + 64
1    libswiftCore.so                    0x0000ffff7fa320e4 _swift_stdlib_reportFatalErrorInFile + 128
2    libswiftCore.so                    0x0000ffff7f7867b0 <unavailable> + 1439664
3    libswiftCore.so                    0x0000ffff7f785a28 _assertionFailure(_:_:file:line:flags:) + 464
4    PiTest                             0x0000aaaadd95ee64 <unavailable> + 343652
5    PiTest                             0x0000aaaadd96363c <unavailable> + 362044
6    PiTest                             0x0000aaaadd9637b4 <unavailable> + 362420
7    libswiftCore.so                    0x0000ffff7f7cb5e0 _debugPrint_unlocked<A, B>(_:_:) + 304
8    libswiftCore.so                    0x0000ffff7f835120 <unavailable> + 2154784
9    libswiftCore.so                    0x0000ffff7f7cacb4 _print_unlocked<A, B>(_:_:) + 740
10   libswiftCore.so                    0x0000ffff7f83b5bc <unavailable> + 2180540
11   libswiftCore.so                    0x0000ffff7f83a680 <unavailable> + 2176640
12   PiTest                             0x0000aaaadd915fc8 <unavailable> + 45000
13   PiTest                             0x0000aaaadd916068 <unavailable> + 45160
14   PiTest                             0x0000aaaadd9160c8 <unavailable> + 45256
15   libswiftCore.so                    0x0000ffff7f84c7b8 Sequence.forEach(_:) + 384
16   PiTest                             0x0000aaaadd915c68 <unavailable> + 44136
17   libc.so.6                          0x0000ffff7eb74fa8 __libc_start_main + 232
18   PiTest                             0x0000aaaadd9158ec <unavailable> + 43244
[1]    8649 trace trap  sudo swift run

The text was updated successfully, but these errors were encountered:

uraimo · 2020-06-05T19:43:07Z

Thanks for reporting this, are you using a 64bits OS and Swift 5.2.4-v4 on both?

uraimo · 2020-06-05T19:57:07Z

It should work now if you pull master/1.1.15 and use .RaspberryPi4 as board type on the Pi4.

KevinVitale · 2020-06-07T04:52:00Z

@uraimo thanks for such a quick response. Unfortunately, it's still crashing:

➜  PiTest sudo swift run
(key: SwiftyGPIO.GPIOName.P12, value: GPIO12<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P22, value: GPIO22<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P6, value: GPIO6<IN,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P13, value: GPIO13<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P3, value: GPIO3<OUT,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P4, value: GPIO4<IN,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P9, value: GPIO9<OUT,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P14, value: GPIO14<OUT,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P5, value: GPIO5<IN,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P10, value: GPIO10<OUT,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P11, value: GPIO11<OUT,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P20, value: GPIO20<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P15, value: GPIO15<OUT,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P17, value: GPIO17<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P26, value: GPIO26<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P24, value: GPIO24<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P19, value: GPIO19<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P23, value: GPIO23<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P27, value: GPIO27<IN,NONE,true>: 0)
Fatal error: Unexpectedly found nil while unwrapping an Optional value: file /home/ubuntu/Swift/PiTest/.build/checkouts/SwiftyGPIO/Sources/SwiftyGPIO.swift, line 73
Current stack trace:
0    libswiftCore.so                    0x0000ffff8aa30e4c swift_reportError + 64
1    libswiftCore.so                    0x0000ffff8aa960e4 _swift_stdlib_reportFatalErrorInFile + 128
2    libswiftCore.so                    0x0000ffff8a7ea7b0 <unavailable> + 1439664
3    libswiftCore.so                    0x0000ffff8a7e9a28 _assertionFailure(_:_:file:line:flags:) + 464
4    PiTest                             0x0000aaaac39decd8 <unavailable> + 343256
5    PiTest                             0x0000aaaac39e34b0 <unavailable> + 361648
6    PiTest                             0x0000aaaac39e3628 <unavailable> + 362024
7    libswiftCore.so                    0x0000ffff8a82f5e0 _debugPrint_unlocked<A, B>(_:_:) + 304
8    libswiftCore.so                    0x0000ffff8a899120 <unavailable> + 2154784
9    libswiftCore.so                    0x0000ffff8a82ecb4 _print_unlocked<A, B>(_:_:) + 740
10   libswiftCore.so                    0x0000ffff8a89f5bc <unavailable> + 2180540
11   libswiftCore.so                    0x0000ffff8a89e680 <unavailable> + 2176640
12   PiTest                             0x0000aaaac39960a8 <unavailable> + 45224
13   PiTest                             0x0000aaaac3996148 <unavailable> + 45384
14   PiTest                             0x0000aaaac39961a8 <unavailable> + 45480
15   libswiftCore.so                    0x0000ffff8a8b07b8 Sequence.forEach(_:) + 384
16   PiTest                             0x0000aaaac3995d48 <unavailable> + 44360
17   libc.so.6                          0x0000ffff89bd8fa8 __libc_start_main + 232
18   PiTest                             0x0000aaaac39959cc <unavailable> + 43468
[1]    3010 trace trap  sudo swift run

This is after I pulled master and changed the source to GPIOs(for: .RaspberryPi4):

➜  PiTest cat Package.resolved 
{
  "object": {
    "pins": [
      {
        "package": "SwiftyGPIO",
        "repositoryURL": "https://github.com/uraimo/SwiftyGPIO.git",
        "state": {
          "branch": "master",
          "revision": "7c0c84aaae8c035ad0c0bbefe925cb7b91e68ca7",
          "version": null
        }
      }
    ]
  },
  "version": 1
}

One other thing: running 64bit on Ubuntu Server 20.04

KevinVitale · 2020-06-07T15:32:20Z

Update: Appears it may be an Ubuntu Server 20.04 issue? I had a suspicion, and when I re-ran my script on RPI 4B w/Ubuntu Server 18.04, it worked.

My apologies; I should restate my test rigs (for us both):

RPi 3B+, 1GB – Ubuntu Server 18.04 ✅
RPi 4B, 4GB – Ubuntu Server 18.04 ✅
RPi 4B, 4GB – Ubuntu Server 20.04 ❌
RPi 4B, 8GB – Ubuntu Server 20.04 ❌

➜  PiTest sudo swift run 
(key: SwiftyGPIO.GPIOName.P19, value: GPIO19<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P24, value: GPIO24<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P11, value: GPIO11<OUT,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P6, value: GPIO6<IN,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P25, value: GPIO25<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P22, value: GPIO22<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P20, value: GPIO20<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P2, value: GPIO2<OUT,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P23, value: GPIO23<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P4, value: GPIO4<IN,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P26, value: GPIO26<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P9, value: GPIO9<OUT,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P27, value: GPIO27<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P16, value: GPIO16<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P3, value: GPIO3<OUT,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P18, value: GPIO18<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P14, value: GPIO14<OUT,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P21, value: GPIO21<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P8, value: GPIO8<OUT,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P15, value: GPIO15<OUT,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P12, value: GPIO12<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P7, value: GPIO7<OUT,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P10, value: GPIO10<OUT,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P5, value: GPIO5<IN,NONE,true>: 1)
(key: SwiftyGPIO.GPIOName.P13, value: GPIO13<IN,NONE,true>: 0)
(key: SwiftyGPIO.GPIOName.P17, value: GPIO17<IN,NONE,true>: 0)

➜  PiTest sudo lshw -short
H/W path    Device  Class      Description
==========================================
                    system     Raspberry Pi 4 Model B Rev 1.2
/0                  bus        Motherboard
/0/1                processor  cpu
/0/2                processor  cpu
/0/3                processor  cpu
/0/4                processor  cpu
/0/5                memory     3791MiB System memory
/0/0                bridge     Broadcom Inc. and subsidiaries
/0/0/0              bus        VL805 USB 3.0 Host Controller
/0/0/0/0    usb1    bus        xHCI Host Controller
/0/0/0/0/1          bus        USB2.0 Hub
/0/0/0/1    usb2    bus        xHCI Host Controller
/1          usb3    bus        DWC OTG Controller
/2          wlan0   network    Wireless interface
/3          eth0    network    Ethernet interface```

uraimo · 2020-06-07T20:16:30Z

I'm getting the same error on a Pi4B Rev1.1 with 32bit debian buster (similar to 18.04), the issue seem to be consistently with the initialization of gpio 10,11 and 19.
Updating the firmware/OS didn't help, I need to investigate this further.

uraimo · 2020-06-07T20:37:09Z

Those are all SPI/PWM pins, can you install wiringpi and run "gpio readall" on 18.04 and 20.04?
Since I can't even export those gpios manually, it could be that they are locked in the alternative mode now (latest updates on buster and from 20.04 onward), readall should print the current mode for each one.

KevinVitale · 2020-06-08T18:49:02Z

Ubuntu 20.04 LTS (GNU/Linux 5.4.0-1011-raspi aarch64)

➜  WiringPi git:(master) sudo gpio readall  
 +-----+-----+---------+------+---+---Pi 4B--+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 |     |     |    3.3v |      |   |  1 || 2  |   |      | 5v      |     |     |
 |   2 |   8 |   SDA.1 | ALT0 | 1 |  3 || 4  |   |      | 5v      |     |     |
 |   3 |   9 |   SCL.1 | ALT0 | 1 |  5 || 6  |   |      | 0v      |     |     |
 |   4 |   7 | GPIO. 7 |   IN | 1 |  7 || 8  | 1 | ALT5 | TxD     | 15  | 14  |
 |     |     |      0v |      |   |  9 || 10 | 1 | ALT5 | RxD     | 16  | 15  |
 |  17 |   0 | GPIO. 0 |   IN | 0 | 11 || 12 | 0 | IN   | GPIO. 1 | 1   | 18  |
 |  27 |   2 | GPIO. 2 |   IN | 0 | 13 || 14 |   |      | 0v      |     |     |
 |  22 |   3 | GPIO. 3 |   IN | 0 | 15 || 16 | 0 | IN   | GPIO. 4 | 4   | 23  |
 |     |     |    3.3v |      |   | 17 || 18 | 0 | IN   | GPIO. 5 | 5   | 24  |
 |  10 |  12 |    MOSI | ALT0 | 0 | 19 || 20 |   |      | 0v      |     |     |
 |   9 |  13 |    MISO | ALT0 | 0 | 21 || 22 | 0 | IN   | GPIO. 6 | 6   | 25  |
 |  11 |  14 |    SCLK | ALT0 | 0 | 23 || 24 | 1 | OUT  | CE0     | 10  | 8   |
 |     |     |      0v |      |   | 25 || 26 | 1 | OUT  | CE1     | 11  | 7   |
 |   0 |  30 |   SDA.0 |   IN | 1 | 27 || 28 | 1 | IN   | SCL.0   | 31  | 1   |
 |   5 |  21 | GPIO.21 |   IN | 1 | 29 || 30 |   |      | 0v      |     |     |
 |   6 |  22 | GPIO.22 |   IN | 1 | 31 || 32 | 0 | IN   | GPIO.26 | 26  | 12  |
 |  13 |  23 | GPIO.23 |   IN | 0 | 33 || 34 |   |      | 0v      |     |     |
 |  19 |  24 | GPIO.24 |   IN | 0 | 35 || 36 | 0 | IN   | GPIO.27 | 27  | 16  |
 |  26 |  25 | GPIO.25 |   IN | 0 | 37 || 38 | 0 | IN   | GPIO.28 | 28  | 20  |
 |     |     |      0v |      |   | 39 || 40 | 0 | IN   | GPIO.29 | 29  | 21  |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+---Pi 4B--+---+------+---------+-----+-----+
➜  WiringPi git:(master) gpio -v          
gpio version: 2.60
Copyright (c) 2012-2018 Gordon Henderson
This is free software with ABSOLUTELY NO WARRANTY.
For details type: gpio -warranty

Raspberry Pi Details:
  Type: Pi 4B, Revision: 04, Memory: 0MB, Maker: Sony 
  * Device tree is enabled.
  *--> Raspberry Pi 4 Model B Rev 1.4
  * This Raspberry Pi supports user-level GPIO access.

Ubuntu 18.04.4 LTS (GNU/Linux 5.3.0-1026-raspi2 aarch64)

➜  WiringPi git:(master) sudo gpio readall
 +-----+-----+---------+------+---+---Pi 4B--+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 |     |     |    3.3v |      |   |  1 || 2  |   |      | 5v      |     |     |
 |   2 |   8 |   SDA.1 | ALT0 | 1 |  3 || 4  |   |      | 5v      |     |     |
 |   3 |   9 |   SCL.1 | ALT0 | 1 |  5 || 6  |   |      | 0v      |     |     |
 |   4 |   7 | GPIO. 7 |   IN | 1 |  7 || 8  | 1 | ALT5 | TxD     | 15  | 14  |
 |     |     |      0v |      |   |  9 || 10 | 1 | ALT5 | RxD     | 16  | 15  |
 |  17 |   0 | GPIO. 0 |   IN | 0 | 11 || 12 | 0 | IN   | GPIO. 1 | 1   | 18  |
 |  27 |   2 | GPIO. 2 |   IN | 0 | 13 || 14 |   |      | 0v      |     |     |
 |  22 |   3 | GPIO. 3 |   IN | 0 | 15 || 16 | 0 | IN   | GPIO. 4 | 4   | 23  |
 |     |     |    3.3v |      |   | 17 || 18 | 0 | IN   | GPIO. 5 | 5   | 24  |
 |  10 |  12 |    MOSI | ALT0 | 0 | 19 || 20 |   |      | 0v      |     |     |
 |   9 |  13 |    MISO | ALT0 | 0 | 21 || 22 | 0 | IN   | GPIO. 6 | 6   | 25  |
 |  11 |  14 |    SCLK | ALT0 | 0 | 23 || 24 | 1 | OUT  | CE0     | 10  | 8   |
 |     |     |      0v |      |   | 25 || 26 | 1 | OUT  | CE1     | 11  | 7   |
 |   0 |  30 |   SDA.0 |   IN | 1 | 27 || 28 | 1 | IN   | SCL.0   | 31  | 1   |
 |   5 |  21 | GPIO.21 |   IN | 1 | 29 || 30 |   |      | 0v      |     |     |
 |   6 |  22 | GPIO.22 |   IN | 1 | 31 || 32 | 0 | IN   | GPIO.26 | 26  | 12  |
 |  13 |  23 | GPIO.23 |   IN | 0 | 33 || 34 |   |      | 0v      |     |     |
 |  19 |  24 | GPIO.24 |   IN | 0 | 35 || 36 | 0 | IN   | GPIO.27 | 27  | 16  |
 |  26 |  25 | GPIO.25 |   IN | 0 | 37 || 38 | 0 | IN   | GPIO.28 | 28  | 20  |
 |     |     |      0v |      |   | 39 || 40 | 0 | IN   | GPIO.29 | 29  | 21  |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+---Pi 4B--+---+------+---------+-----+-----+
➜  WiringPi git:(master) gpio -v
gpio version: 2.60
Copyright (c) 2012-2018 Gordon Henderson
This is free software with ABSOLUTELY NO WARRANTY.
For details type: gpio -warranty

Raspberry Pi Details:
  Type: Pi 4B, Revision: 02, Memory: 4096MB, Maker: Sony 
  * Device tree is enabled.
  *--> Raspberry Pi 4 Model B Rev 1.2
  * This Raspberry Pi supports user-level GPIO access.

KevinVitale · 2020-06-21T21:06:00Z

@uraimo anything I can do to help with this?

GPIOs 10,11 and 19 and not being exported correctly on Pi4, removing them temporarily until upstream fixes this. Have not verified if the alternate function on these pins still work correctly.

uraimo · 2020-08-02T15:47:54Z

Excluded the gpio 10, 11 and 19 from the Pi4's list until Raspian fixes them upstream.
The issue can be replicated via terminal too, exporting one of the three gpios.

KevinVitale changed the title ~~Iterating GPIOs crashes on RPi 4~~ Iterating GPIOs crashes on RPi 4 on Ubuntu Server 20.04 Jun 7, 2020

KevinVitale changed the title ~~Iterating GPIOs crashes on RPi 4 on Ubuntu Server 20.04~~ Iterating GPIOs crashes on Ubuntu Server 20.04 Jun 7, 2020

KevinVitale changed the title ~~Iterating GPIOs crashes on Ubuntu Server 20.04~~ Iterating GPIOs crashes on Raspberry Pi 4B Jun 7, 2020

uraimo added the upstream label Aug 2, 2020

uraimo mentioned this issue Aug 3, 2020

GPIO19 missing for RaspberryPi4 #106

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Iterating GPIOs crashes on Raspberry Pi 4B #104

Iterating GPIOs crashes on Raspberry Pi 4B #104

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Iterating GPIOs crashes on Raspberry Pi 4B #104

Iterating GPIOs crashes on Raspberry Pi 4B #104

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