The Industrial Raspberry Pi Forum

mezz wrote: ↑21 Mar 2018, 18:14 I am experiencing an analogous issue with a RevPi core 3 I received a month ago.
At times it shuts down by itself and all LEDs (revpi and attached modules) are red, so in shutdown/fault mode I guess.
There was no custom software running at fault time the first time the issue appeared and the revpi was freshly unpacked and all updates installed.
Everything had been working with custom software on a RevPi core 1 for months before without a single crash, same power supply and IO modules.

I have noticed that a non-closed remote ssh login seems to cause more frequent crashes.

After the the system was correctly powered through a UPS and earthed the issue appeared again, a normal raspberrypi connected on the same line did not report any shutdown events or faults, so the main line (UPS) is stable.
This time an additional program was running but was constantly profiled and the logs are written to a mounted external USB flash device. The CPU has an average of 2.5% usage per core and RAM is available.
There were no hardware changes, I just left some screen sessions open for testing.
I have analysed the kern.log, auth.log, checked the last logins and nothing strange shows up, I still have them in case.
As said a RevPi core 1 with the same Jessy image and updates had not had any issues with modules attached.
This last crash was on 15th March at about 8:30am guessing by the missing cron events in auth.log. The system has been running since and I am constantly monitoring it.

One suspicious entry was this:

Code: Select all

Mar 11 22:06:29 RevPi4858 kernel: [123702.816477] piControl: too many communication errors -> set inputs to default 0 2 2 3   3 3 0 0

But it happened to appear days before the last crash. The annoying part is that this has happened 4 times now and there is no obvious error source.

Any suggestions as to why the system shuts down under normal conditions? all status LEDs of the RevPi core 3 and of the connected modules are red, as if it had been shut down via software, a full power loss and a reboot would have restarted the system correctly.
Could it be the 24V power source? But there is a UPS and the other pieces of hardware don't go down and it has been running for 6 days now (sign of power stability).

Enrico

volker wrote: ↑21 Mar 2018, 21:59 I'm sorry to hear that you both have experienced trouble . The facts you have reported do not give any clue why your system acts as it does. We could try finding out reasons but this will be a difficult task to be done by email and forum. All I can offer is the following:
1) Please do download the current production image (if you have not saved your original image) and upload it to the device. Then let your system run without any additions and applications but configured with PiControl in a proper way. If the system runs stable then you might have a trouble with your application or system setup parameters.
2) Get in contact with me by PM so we can exchange details and mail addresses so our experts could may be tell you which logs we need to analyze the crash from a deeper point of view.
3) If you do not want to invest the time for 1) and 2) then simply send back the device and we will replace it and hope that things will get working with the replacement.

As we do have thousands of systems out there running without trouble I can only guess that either any kind of user application or data or system setup causes the trouble or your individual RevPi hardware has some kind of trouble which was not detected by our product end tests. In case a) number 1) would help and in case b) number 3) will help. So please choose whatever you think is the most likely way to solve your problems without waisting too much time.

mezz wrote: ↑22 Mar 2018, 12:20 Hi,

Frank I meant to contribute with some more information since my RevPi raised the issue immediately after the unpacking and updating and I have been investigating it for a while.
My contribution was meant to provide help for both and not hijack the attention to two different threads, apologies if you felt otherwise, I won't barge in any more.

Volker, I did flash the original image, will try to reinstate it and replace the RevPi 3 with the old one in the mean time, I will send it back in case.

Enrico