The Industrial Raspberry Pi Forum

Posted: **03 Dec 2021, 23:34**

Hello, we have a few revpi compact devices in house and they all exhibit the same problem
The revpi always hangs after a while when USB devices are hooked, we only hook USB-RS232 (FTDI) cables
kernel.log doesn't show much (I'll attach one later)
I looked at viewtopic.php?f=17&t=1841, ran apt update, after update the problem persists
kernel is 4.19
anything else we can do to try to solve the problem?

thanks

Posted: **06 Dec 2021, 08:08**

Hi sherifeid,

please share the kernel log of the affected system. Which image version do you use?

Nicolai

Posted: **06 Dec 2021, 18:15**

Thanks Nicolai, for some reason I can't attach files to this to this message
you can access the kern log files

https://drive.google.com/drive/folders/ ... sp=sharing

the devices came flashed with Buster, we didn't do any flashing

here's the output of

Code: Select all

uname -a

Code: Select all

Linux mp-pvs1-B4 4.19.95-rt38-v7 #1 SMP PREEMPT RT Tue, 22 Jun 2021 14:13:31 +0000 armv7l GNU/Linux

Posted: **08 Jan 2022, 21:25**

I seem to have the same problem, with a LucidControl DI4 digital IO module (https://www.lucid-control.com/product/l ... sb-module/) connected through USB. If I don't interact with the module, the revpi compact works fine, but when communicating with that particular USB device, the system hangs within ~30 mins. I did not find any problems in log files and I also have an FTDI device and a ch341-uart converter which give no problems at all. I am on the buster image:

root@RevPi11079:/home/pi# cat /etc/debian_version
10.11
root@RevPi11079:/home/pi# uname -a
Linux RevPi11079 4.19.95-rt38-v7 #1 SMP PREEMPT RT Tue, 09 Nov 2021 08:04:06 +0000 armv7l GNU/Linux]

Snip of the dmesg log with connected usb devices:

[ 12.215299] usbcore: registered new interface driver usbserial_generic
[ 12.221703] usbserial: USB Serial support registered for generic
[ 12.247730] usbcore: registered new interface driver ftdi_sio
[ 12.247830] usbserial: USB Serial support registered for FTDI USB Serial Device
[ 12.248051] ftdi_sio 1-1.3:1.0: FTDI USB Serial Device converter detected
[ 12.248263] usb 1-1.3: Detected FT232RL
[ 12.249359] usb 1-1.3: FTDI USB Serial Device converter now attached to ttyUSB0
[ 12.401413] cdc_acm 1-1.5:1.0: ttyACM0: USB ACM device
[ 12.415027] usbcore: registered new interface driver cdc_acm
[ 12.415038] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
[ 12.966423] usbcore: registered new interface driver ch341
[ 12.971211] usbserial: USB Serial support registered for ch341-uart
[ 12.975475] ch341 1-1.4:1.0: ch341-uart converter detected
[ 13.005596] usb 1-1.4: ch341-uart converter now attached to ttyUSB1

The problematic device is on ttyACM0. I suspect a bug in the cdc_acm driver might be to blame, though I'm not sure where (I see no obvious candidate in https://github.com/torvalds/linux/commi ... /cdc-acm.c).

I think it would be worthwhile to try a more recent kernel/driver version. Would it be possible to build an image with a more recent kernel? (or provide a package with a more recent kernel). I see that Raspberry Pi OS 2021-05-07, on which this image is based, comes with 5.10.17, but I assume the 4.19.95-rt38 kernel has some specifics for the RevPi.

Other suggestions are of course also welcome!

Thanks and regards

Posted: **11 Jan 2022, 09:29**

Hi,
I think that we have the same problem. Our Compact was running for about 80 days and suddenly it stopped working .

@ nicolaiB is there a fix in work?

Posted: **11 Jan 2022, 10:58**

Hi rheeres

rheeres wrote: ↑08 Jan 2022, 21:25 I seem to have the same problem, with a LucidControl DI4 digital IO module (https://www.lucid-control.com/product/l ... sb-module/) connected through USB. If I don't interact with the module, the revpi compact works fine, but when communicating with that particular USB device, the system hangs within ~30 mins. I did not find any problems in log files and I also have an FTDI device and a ch341-uart converter which give no problems at all. I am on the buster image:

I don't know the LucidControl devices, but this sounds like an issue with the LucidControl device / drivers, especially when the FTDI and CH341 are working. Have you already asked the manufacturer about known issues with kernel 4.19?

rheeres wrote: ↑08 Jan 2022, 21:25 I think it would be worthwhile to try a more recent kernel/driver version. Would it be possible to build an image with a more recent kernel? (or provide a package with a more recent kernel). I see that Raspberry Pi OS 2021-05-07, on which this image is based, comes with 5.10.17, but I assume the 4.19.95-rt38 kernel has some specifics for the RevPi.

Yes, the 4.19.95-rt39 Kernel contains some RevPi specific patches, so the stock raspberry Kernel won't work. We are currently working on a Kernel 5.10 which contains all patches, but don't have any release date yet. You can try to build the kernel at your own risk with our kernelbakery (https://github.com/RevolutionPi/kernelb ... .10/README).

Nicolai

Posted: **11 Jan 2022, 11:00**

Hi Christoph

Christoph.b wrote: ↑11 Jan 2022, 09:29 I think that we have the same problem. Our Compact was running for about 80 days and suddenly it stopped working .

Without any logs or error messages this can be caused by a lot of different things. Do you have more details?

Nicolai

Posted: **11 Jan 2022, 13:45**

the part of the kern.log file.

Jan 1 19:10:25 RevPi6511 kernel: [6913652.581365] piControl: piControl i/o: missed 1 cycles
Jan 1 19:10:51 RevPi6511 kernel: [6913678.074307] piControl: piControl i/o: missed 2 cycles
Jan 1 19:11:52 RevPi6511 kernel: [6913739.621837] piControl: piControl i/o: missed 1 cycles
Jan 1 19:12:16 RevPi6511 kernel: [6913763.074822] piControl: piControl i/o: missed 2 cycles
Jan 1 19:13:41 RevPi6511 kernel: [6913848.075335] piControl: piControl i/o: missed 2 cycles
Jan 1 19:14:39 RevPi6511 kernel: [6913905.962490] piControl: piControl i/o: missed 8 cycles
Jan 1 19:15:02 RevPi6511 kernel: [6913929.062899] piControl: piControl i/o: missed 1 cycles
Jan 1 19:15:06 RevPi6511 kernel: [6913933.075893] piControl: piControl i/o: missed 3 cycles
Jan 1 19:18:32 RevPi6511 kernel: [6914138.984188] piControl: piControl i/o: missed 1 cycles
Jan 1 19:19:21 RevPi6511 kernel: [6914188.077496] piControl: piControl i/o: missed 3 cycles
Jan 1 19:20:40 RevPi6511 kernel: [6914266.985029] piControl: piControl i/o: missed 1 cycles
Jan 1 19:20:46 RevPi6511 kernel: [6914273.078052] piControl: piControl i/o: missed 2 cycles
Jan 1 19:21:24 RevPi6511 kernel: [6914311.825084] piControl: piControl i/o: missed 17 cycles
Jan 1 19:22:11 RevPi6511 kernel: [6914358.078563] piControl: piControl i/o: missed 2 cycles
Jan 1 19:23:36 RevPi6511 kernel: [6914443.079078] piControl: piControl i/o: missed 2 cycles
Jan 1 19:25:01 RevPi6511 kernel: [6914528.079616] piControl: piControl i/o: missed 2 cycles
Jan 1 19:26:26 RevPi6511 kernel: [6914613.080138] piControl: piControl i/o: missed 1 cycles
Jan 1 19:27:51 RevPi6511 kernel: [6914698.080629] piControl: piControl i/o: missed 1 cycles
Jan 1 19:30:58 RevPi6511 kernel: [6914885.639245] piControl: piControl i/o: missed 6 cycles
Jan 1 19:32:47 RevPi6511 kernel: [6914994.030298] piControl: piControl i/o: missed 1 cycles
Jan 11 08:22:44 RevPi6511 kernel: [ 0.000000] Booting Linux on physical CPU 0x0
Jan 11 08:22:44 RevPi6511 kernel: [ 0.000000] Linux version 4.19.95-rt38-v7 (admin@kunbus.de) (gcc version 8.3.0 (Debian 8.3.0-2)) #1 SMP PREEMPT RT Tue, 22 Jun 2021 14:13:31 +0000
Jan 11 08:22:44 RevPi6511 kernel: [ 0.000000] CPU: ARMv7 Processor [410fd034] revision 4 (ARMv7), cr=10c5383d
Jan 11 08:22:44 RevPi6511 kernel: [ 0.000000] CPU: div instructions available: patching division code
Jan 11 08:22:44 RevPi6511 kernel: [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
Jan 11 08:22:44 RevPi6511 kernel: [ 0.000000] OF: fdt: Machine model: Raspberry Pi Compute Module 3 Plus Rev 1.0

Posted: **18 Jan 2022, 16:45**

@ nicolaiB could you see anything in the log

Posted: **18 Jan 2022, 16:58**

No, the snippet looks really short. Could you please share the full log file?

Nicolai

The Industrial Raspberry Pi Forum

Revpi Compact freezes with USB devices

Revpi Compact freezes with USB devices

Re: Revpi Compact freezes with USB devices

Re: Revpi Compact freezes with USB devices

Re: Revpi Compact freezes with USB devices

Re: Revpi Compact freezes with USB devices

Re: Revpi Compact freezes with USB devices

Re: Revpi Compact freezes with USB devices

Re: Revpi Compact freezes with USB devices

Re: Revpi Compact freezes with USB devices

Re: Revpi Compact freezes with USB devices