jahboater
Posts: 4440
Joined: Wed Feb 04, 2015 6:38 pm

Re: Raspberry Pi 3 B+ lockups

Sun May 06, 2018 7:21 pm

It is this cpuburn-a53

Code: Select all

wget https://raw.githubusercontent.com/ssvb/cpuburn-arm/master/cpuburn-a53.S
gcc -o cpuburn-a53 cpuburn-a53.S
./cpuburn-a53
It does stuff with NEON on all four cores.

jamesh
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Re: Raspberry Pi 3 B+ lockups

Sun May 06, 2018 7:57 pm

wybielacz wrote:
Sun May 06, 2018 11:11 am
jamesh wrote:
Sun May 06, 2018 7:14 am
It looks like yours is simply defective (ie probably a SoC that is too far out of spec to work correctly at the required settings). I''d return it for a replacement.
I literally wasted my money on this stuff, i cannot return it for a replacement anymore so the only thing i can do with it, is throw it into trash! And my perfectly working RPi 3B is already sold.....
My home automation and media center should run on this Pi, but because of this issue none of them is usable right now!
I am really disappointed from the RPi 3B+, i never had any issues with my previous RPi's but with this new one my trust is lost...


Seriously, i think that they have some serious quality problems, or they rushed the Pi3B+ so much that they missed a design flaw. Right now they trying to cover this up with a "software fix", but in fact this seems to be a hardware issue...
I don't understand why you cannot return? It's only been out for a month or so. In Europe, you have 2 years warranty automatically.

There is no design flaw on the Pi itself, but as has been explained before, it appears that some SoC's have come off the fab outside the specification of all the initial run of chips we received for testing. We tested all the initial batches and came up with the SD ram/CPU settings that worked. However, if you suddenly get a batch from the fab outside those parameters, some might have problems, which cannot be caught on the production line since the problem only appears after some time, and with 5000 a day being made, thee is no chance of long term testing.

AIUI, we have sold over 1/2M P3B+ already, so the actual proportion of failures is actually quite low.
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jamesh
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Re: Raspberry Pi 3 B+ lockups

Sun May 06, 2018 7:59 pm

Nachteule wrote:
Sun May 06, 2018 10:41 am
jamesh wrote:
Sun May 06, 2018 7:14 am
wybielacz wrote:
Sun May 06, 2018 6:50 am



Unfortunately arm_freq=1200 didn't help, the Pi did loockup overnight again...
It looks like yours is simply defective (ie probably a SoC that is too far out of spec to work correctly at the required settings). I''d return it for a replacement.
Do you really believe that ???

The faulty rate of produced Pi3B+ is extremely high (mine two did not run stable with 500MHz == 100% fault), and it seems that quality control is a foreign word for the manufacturer
Yes. The fault rate is incredibly low, with over 1/2M sold so far, probely <100 showing the fault (this figure may rise, but most seem to be working fine). All devices are tested on the production line, but this particular fault, since it occurs only after some time, cannot be caught during production testing.
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crofter
Posts: 55
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Re: Raspberry Pi 3 B+ lockups

Sun May 06, 2018 8:03 pm

not all dealers accept the 2 year warranty as eu rules their was a comment last week about this how about raspberry pi make a satement about this

crofter

jahboater
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Re: Raspberry Pi 3 B+ lockups

Sun May 06, 2018 8:16 pm

wybielacz wrote:
Sun May 06, 2018 2:45 pm
So i did run the cpuburn-a53 test on my raspberry pi 3B+ and the Pi did not crash after 20 minutes. But what i noticed is that the Pi throttles down to around 600-700mHz cpu after a few minutes and temps are around 86 degree. Is this normal with this test? My Pi has no additional cooling.
At least i can say that on my side it is not a thermal problem as it seems, but why does it throttle so much?
Here is a 45 minute run of cpuburn-a53.
It throttled a bit quicker than I remembered, but it is a very hot day. You can see its stabilized and the freq never goes below 1034Mhz.
Impressive thermal management considering this is an extreme stress test. In the early days of the old Pi3 this would crash it in seconds.
Perhaps you should add a heatsink?

Code: Select all

Time       Temp    CPU         Throttled     Vcore
20:28:26; 39.7'C  600MHz 0000000000000000000 1.2V
20:29:27; 68.8'C 1400MHz 0000000000000000000 1.3750V
20:30:27; 71.4'C 1200MHz 0000000000000000000 1.2563V
20:31:27; 75.2'C 1200MHz 0000000000000000000 1.2563V
20:32:28; 77.4'C 1200MHz 0000000000000000000 1.2563V
20:33:28; 79.0'C 1200MHz 0000000000000000000 1.2563V
20:34:28; 80.6'C 1200MHz 0100000000000000010 1.2563V
20:35:29; 80.1'C 1141MHz 0100000000000000010 1.2563V
20:36:29; 80.6'C 1141MHz 0100000000000000010 1.2563V
20:37:29; 80.6'C 1141MHz 0100000000000000000 1.2563V
20:38:30; 80.6'C 1141MHz 0100000000000000010 1.2563V
20:39:30; 80.6'C 1141MHz 0100000000000000010 1.2563V
20:40:31; 81.1'C 1141MHz 0100000000000000010 1.2563V
20:41:31; 80.6'C 1087MHz 0100000000000000010 1.2563V
20:42:31; 80.6'C 1141MHz 0100000000000000010 1.2563V
Time       Temp    CPU         Throttled     Vcore
20:43:32; 81.1'C 1141MHz 0100000000000000010 1.2563V
20:44:32; 81.7'C 1141MHz 0100000000000000010 1.2563V
20:45:32; 80.6'C 1141MHz 0100000000000000010 1.2563V
20:46:33; 81.7'C 1195MHz 0100000000000000010 1.2563V
20:47:33; 81.7'C 1034MHz 0100000000000000010 1.2563V
20:48:33; 81.1'C 1141MHz 0100000000000000010 1.2563V
20:49:33; 81.7'C 1141MHz 0100000000000000010 1.2563V
20:50:34; 80.6'C 1087MHz 0100000000000000010 1.2563V
20:51:34; 80.6'C 1141MHz 0100000000000000010 1.2563V
20:52:35; 81.7'C 1141MHz 0100000000000000010 1.2563V
20:53:35; 80.6'C 1087MHz 0100000000000000010 1.2563V
20:54:35; 81.7'C 1087MHz 0100000000000000010 1.2563V
20:55:36; 80.6'C 1034MHz 0100000000000000010 1.2563V
20:56:36; 81.7'C 1141MHz 0100000000000000010 1.2563V
20:57:36; 80.6'C 1034MHz 0100000000000000010 1.2563V
Time       Temp    CPU         Throttled     Vcore
20:58:37; 81.7'C 1141MHz 0100000000000000010 1.2563V
20:59:37; 80.6'C 1141MHz 0100000000000000010 1.2563V
21:00:37; 81.1'C 1141MHz 0100000000000000010 1.2563V
21:01:38; 81.1'C 1034MHz 0100000000000000010 1.2563V
21:02:38; 81.1'C 1141MHz 0100000000000000010 1.2563V
21:03:38; 81.7'C 1087MHz 0100000000000000010 1.2563V
21:04:39; 81.1'C 1141MHz 0100000000000000010 1.2563V
21:05:39; 81.1'C 1141MHz 0100000000000000010 1.2563V
21:06:39; 81.7'C 1034MHz 0100000000000000010 1.2563V
21:07:39; 80.6'C 1141MHz 0100000000000000010 1.2563V
21:08:40; 81.1'C 1034MHz 0100000000000000010 1.2563V
21:09:40; 80.6'C 1087MHz 0100000000000000010 1.2563V
21:10:40; 81.1'C 1087MHz 0100000000000000010 1.2563V
21:11:41; 80.6'C 1034MHz 0100000000000000010 1.2563V
21:12:41; 81.1'C 1141MHz 0100000000000000010 1.2563V

wybielacz
Posts: 29
Joined: Wed Nov 06, 2013 9:37 pm

Re: Raspberry Pi 3 B+ lockups

Sun May 06, 2018 9:34 pm

jahboater wrote:
Sun May 06, 2018 8:16 pm
Here is a 45 minute run of cpuburn-a53.
It throttled a bit quicker than I remembered, but it is a very hot day. You can see its stabilized and the freq never goes below 1034Mhz.
Impressive thermal management considering this is an extreme stress test. In the early days of the old Pi3 this would crash it in seconds.
Perhaps you should add a heatsink?

That is interesting, do you have any additional cooling on your Pi?

I would like to know what the expected results should be at this test without any additional cooling.

jahboater
Posts: 4440
Joined: Wed Feb 04, 2015 6:38 pm

Re: Raspberry Pi 3 B+ lockups

Sun May 06, 2018 9:47 pm

wybielacz wrote:
Sun May 06, 2018 9:34 pm
That is interesting, do you have any additional cooling on your Pi?
Mainly a 15mm cube (Adafruit) heatsink on the soc, HDMI cable and audio cable plugged in, heatsink on the WiFi shield (which gets very hot). The board is mounted on edge and the heatsink fins are aligned with the convection airflow. 3M thermal tape.
The 3B+ is different in that the ground-plane is part of the heat dispersal. So plugging things into the sockets is said to help.
I would like to know what the expected results should be at this test without any additional cooling.
Don't know, sorry.

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Nachteule
Posts: 22
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Re: Raspberry Pi 3 B+ lockups

Sun May 06, 2018 10:33 pm

jamesh wrote:
Sun May 06, 2018 7:59 pm
Nachteule wrote:
Sun May 06, 2018 10:41 am
jamesh wrote:
Sun May 06, 2018 7:14 am


It looks like yours is simply defective (ie probably a SoC that is too far out of spec to work correctly at the required settings). I''d return it for a replacement.
Do you really believe that ???

The faulty rate of produced Pi3B+ is extremely high (mine two did not run stable with 500MHz == 100% fault), and it seems that quality control is a foreign word for the manufacturer
Yes. The fault rate is incredibly low, with over 1/2M sold so far, probely <100 showing the fault (this figure may rise, but most seem to be working fine). All devices are tested on the production line, but this particular fault, since it occurs only after some time, cannot be caught during production testing.
Yep, and pigs might fly!

ejolson
Posts: 3060
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Re: Raspberry Pi 3 B+ lockups

Mon May 07, 2018 6:44 am

Nachteule wrote:
Sun May 06, 2018 10:33 pm
jamesh wrote:
Sun May 06, 2018 7:59 pm
Nachteule wrote:
Sun May 06, 2018 10:41 am
Do you really believe that ???

The faulty rate of produced Pi3B+ is extremely high (mine two did not run stable with 500MHz == 100% fault), and it seems that quality control is a foreign word for the manufacturer
Yes. The fault rate is incredibly low, with over 1/2M sold so far, probely <100 showing the fault (this figure may rise, but most seem to be working fine). All devices are tested on the production line, but this particular fault, since it occurs only after some time, cannot be caught during production testing.
Yep, and pigs might fly!
The Pi 3B I purchased never ran reliably at default settings; however, it would appear that my Pi 3B+ does.

Careful testing before shipping any factory-produced good is essential to maintain a manufacturer's reputation for reliability. When Lenovo purchased IBM's microcomputer division, the products were known for being some of the most reliable on the market. Time has passed. From my point of view, products from HP and Dell now seem more reliable, especially at the enterprise level. While testing may be expensive, loss of reputation is even more so.

Standards have been going up among competing manufacturers of single board computers. At the same time, upstream Linux is starting to include drivers for a variety of ARM-based platforms. In spite of all the difficulties and competition, the Raspberry Pi is still best-in-class, in my mind, for the 35 USD price category.

As this thread shows, when problems are discovered, changes are quickly made to the software stack to mitigate them. Boards for which the mitigations are ineffective have been recommended to be exchanged as defective. Another contributing factor to my perception of reliability is longevity. Important for longevity is software support: For me it is significant that the current most up-to-date version of Raspbian still runs on the original Pi B.

jamesh
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Re: Raspberry Pi 3 B+ lockups

Mon May 07, 2018 7:22 am

Nachteule wrote:
Sun May 06, 2018 10:33 pm
jamesh wrote:
Sun May 06, 2018 7:59 pm
Nachteule wrote:
Sun May 06, 2018 10:41 am


Do you really believe that ???

The faulty rate of produced Pi3B+ is extremely high (mine two did not run stable with 500MHz == 100% fault), and it seems that quality control is a foreign word for the manufacturer
Yes. The fault rate is incredibly low, with over 1/2M sold so far, probely <100 showing the fault (this figure may rise, but most seem to be working fine). All devices are tested on the production line, but this particular fault, since it occurs only after some time, cannot be caught during production testing.
Yep, and pigs might fly!
So what are you saying? That we haven't sold that many? That the fault rate is really high? That it's actually possible to thoroughly for something like this? That we don't do production lines testing? Something else?
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jahboater
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Re: Raspberry Pi 3 B+ lockups

Mon May 07, 2018 7:44 am

ejolson wrote:
Mon May 07, 2018 6:44 am
The Pi 3B I purchased never ran reliably at default settings
Mine did not at first. However later on after the engineers had tweaked various default settings, it became stable and would survive any stress test.

My new 3B+ is stable as a rock from day one.

Screamsid
Posts: 1
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Re: Raspberry Pi 3 B+ lockups

Mon May 07, 2018 1:12 pm

Suffering from similar issues. Stock psu, and running libreelec. Lock ups daily and toasty warm when I go to power recycle it. Same SD as Pi 3 and had no issues.

Just holding off from pulling the trigger to get it replaced as the first one I received had the pins for PoE header soldered the wrong way up.

photopuppet
Posts: 10
Joined: Tue Jun 03, 2014 7:14 pm

Re: Raspberry Pi 3 B+ lockups

Mon May 07, 2018 7:09 pm

Have a Pi 3B+ too not long and getting these lockups sometimes as well. :( Seems to be related to video perhaps as it runs fine for several days but then locks up after being used in person through the HDMI TV?
I would log onto Raspbian in person after having the Pi running for a few days and then log off, turn TV off, and then it will just die shortly after that (no more HDMI output, unresponsive to SSH etc). If I just use it headless via SSH then no lockups. Haven't altered any system values in the default install.

Should I try and get the Pi board replaced by CPC as faulty or is this a software issue that will be fixed soonish?

Many thanks.

jamesh
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Re: Raspberry Pi 3 B+ lockups

Mon May 07, 2018 8:23 pm

First thing to try, for all the new posters, is

Code: Select all

sudo apt update
sudo apt upgrade
If that doesn't help you could try

Code: Select all

sudo rpi-update
If that still doesn't help, you can either wait for us to complete our testing and come up with the a final set of parameters, or you could ask for a replacement.
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ejolson
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Re: Raspberry Pi 3 B+ lockups

Mon May 07, 2018 9:30 pm

Screamsid wrote:
Mon May 07, 2018 1:12 pm
the first one I received had the pins for PoE header soldered the wrong way up.
Pins soldered in upside down is such an obvious mistake that one wonders whether defective Pi computers routed for the tip were intercepted and resold as genuine product. The fact that a return surprisingly often results in another defective Pi further supports this possibility.

jamesh
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Re: Raspberry Pi 3 B+ lockups

Tue May 08, 2018 8:52 am

ejolson wrote:
Mon May 07, 2018 9:30 pm
Screamsid wrote:
Mon May 07, 2018 1:12 pm
the first one I received had the pins for PoE header soldered the wrong way up.
Pins soldered in upside down is such an obvious mistake that one wonders whether defective Pi computers routed for the tip were intercepted and resold as genuine product. The fact that a return surprisingly often results in another defective Pi further supports this possibility.
Utter rubbish. Utter and COMPLETE rubbish. Who on earth do you think we are? Some fly by night company who shaft their customers by selling defective crap? NO. Just NO. Stop concern trolling, because that is what your post is.

As for returns resulting in a further defective Pi, this I think might have happened once or twice. It's certainly not 'common'. Please use some common sense here, we've sold upwards of 500k Pi3B's. If there was a major problem, this forum would be INUNDATED.

As for PoE pins being soldered on upside down, I'll pass that up the chain of command. That shouldn't happen.
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gawkmeister
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Re: Raspberry Pi 3 B+ lockups

Tue May 08, 2018 10:09 am

On a positive note, I can report that the rpi-update seems to have fixed my B+. The ethernet no longer freezes on samba transfers and my Pi stayed up overnight while running a 500GB data transfer.

photopuppet
Posts: 10
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Re: Raspberry Pi 3 B+ lockups

Tue May 08, 2018 12:29 pm

gawkmeister wrote:
Tue May 08, 2018 10:09 am
On a positive note, I can report that the rpi-update seems to have fixed my B+. The ethernet no longer freezes on samba transfers and my Pi stayed up overnight while running a 500GB data transfer.
Was there a performance change to stop it locking up or does the Pi still work as fast as it's supposed to? Will give rpi-update a try today!

jamesh
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Re: Raspberry Pi 3 B+ lockups

Tue May 08, 2018 2:48 pm

photopuppet wrote:
Tue May 08, 2018 12:29 pm
gawkmeister wrote:
Tue May 08, 2018 10:09 am
On a positive note, I can report that the rpi-update seems to have fixed my B+. The ethernet no longer freezes on samba transfers and my Pi stayed up overnight while running a 500GB data transfer.
Was there a performance change to stop it locking up or does the Pi still work as fast as it's supposed to? Will give rpi-update a try today!
SDRAM now defaults to 450. This should fix the vast majority of issues (which is actually a relatively small percentage anyway). There will be a minor drop in SDRAM performance but that will be hardly noticeable in general usage. If that doesn't fix the issue, then you can try dropping Arm frequency down to 1200 - which is clearly a noticeable drop, so if you are unhappy with that then I'd suggest returning the board. If running memtester on a 1200Mhz board STILL fails then let us know - that is a device that is well out of spec, so we would be interested in getting those in for the team to look at.

Note that the Samba/big transfer issue MAY have been fixed by another change to the network driver that is in rpi-update - this fixes a problem with EEE (Energy Efficient Ethernet) on long cables, but we also suspect might help elsewhere as well.
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ejolson
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Re: Raspberry Pi 3 B+ lockups

Tue May 08, 2018 3:35 pm

jamesh wrote:
Tue May 08, 2018 8:52 am
ejolson wrote:
Mon May 07, 2018 9:30 pm
Screamsid wrote:
Mon May 07, 2018 1:12 pm
the first one I received had the pins for PoE header soldered the wrong way up.
Pins soldered in upside down is such an obvious mistake that one wonders whether defective Pi computers routed for the tip were intercepted and resold as genuine product. The fact that a return surprisingly often results in another defective Pi further supports this possibility.
Utter rubbish. Utter and COMPLETE rubbish. Who on earth do you think we are? Some fly by night company who shaft their customers by selling defective crap? NO. Just NO. Stop concern trolling, because that is what your post is.
I'm not sure you understood what I wrote.

In cases where something like this has happened, it is not the manufacturer who is to blame, but rather a third party who figures out how, where and when defective product is disposed of and resells it as original. Just like counterfeit SD cards indicate the genuine product is of high quality, so does stealing things out of the garbage.

It is not common, but it is also difficult to detect afterwards. I brought it up, not to monger fear, but as an alternative to the idea that factory testing doesn't detect upside down components.

Tozzi1
Posts: 21
Joined: Thu Apr 20, 2017 11:05 pm

Re: Raspberry Pi 3 B+ lockups

Thu May 10, 2018 11:45 pm

Well, I'm affected, too.
4 x Pi 3B+ here, all showing the same symptoms (random lockups overnight).
All 4 bought from Amazon.de, 2 sold directly by Amazon, the others by a reseller.
Two were bought in April, the others in May (3 weeks later).

1 of them is set up as my media server (connected to TV via HDMI, via Ethernet to Router with a switch in between, plus via WLAN to another network), the other 2 are just running naked Raspbian so far and are headless (connected via WiFi to my home network).
1 has got a camera module.

So, the problem might be more wide spread than you think.
I switched to 3A power supplies, without luck.
I've never had any of this happen with my older Pi3 Model Bs.

What's odd is that they seem to work better at freq_sdram=500.
I can't provoke the lockups with memtester.
They mostly happen when the machine is completely idle.

Using latest generation SanDisk Ultra SD cards, mostly 64 GB, the media server has a 128 GB one.
CPU Temp does not exceed 55˚C, using FLIRC cases.

I'll try the rpi-update. Otherwise, the system is up-to-date.
Keeping fingers crossed you figure out the cause of these lockups. Currently, I regret having upgraded to the new model (on quite a scale).

photopuppet
Posts: 10
Joined: Tue Jun 03, 2014 7:14 pm

Re: Raspberry Pi 3 B+ lockups

Fri May 11, 2018 12:42 am

Hey Tozzi, for what it's worth, I haven't had another lockup so far after using rpi-update a few days ago. Wonder if they fixed the issue? *fingers crossed*.

w0mbat
Posts: 1
Joined: Fri May 11, 2018 2:55 am

Re: Raspberry Pi 3 B+ lockups

Fri May 11, 2018 3:25 am

Hi,
I have joined just to report this issue.
I am in Australia and bought my Pi 3B+ from Little Bird Electronics and the stock came from Element 14. Bought on 19 March.
My Pi 3B+ runs only Libreelec/Kodi and is connected to my TV by HDMI and to my network by Ethernet. WiFi is disabled.
I use Pulse 8 and control the Pi by using the TV remote.
My Pi locks up as well,, usually when moving through menus with the remote. Just once it rebooted but it can usually only recover with a power cycle. The problem only becomes apparent when I realise that the Pi has stopped responding to the remote control commands.
Libreelec/Kodi is the latest version.
The Pi 3B+ replaced my Pi 3B. The 3B never once gave me any issue at all. Both used with official Pi case and power supply.
I have reported the issue to the retailer and referred them to this thread. Unfortunately they have chosen to blame Lbreelec/Kodi and have insisted that I install and test with Raspian. I have no interest in doing that and don't see it is relevant. They have refused to replace the Pi without me doing this. Considering this is now a well established issue I find this very annoying and disappointing.
So for now I have reverted to the Pi 3B and put the 3B+ back in its box.
Hopefully this issue can be resolved soon and, if not, that all distributors and retailers can be advised so that those of us with faulty boards (if they are faulty) can get replacements or refunds without argument.
I would like to thank Rasp Pi for the wonderfull work they do and hopefully this unususal glitch can soon be resolved.
Ian

jamesh
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Re: Raspberry Pi 3 B+ lockups

Fri May 11, 2018 8:34 am

w0mbat wrote:
Fri May 11, 2018 3:25 am
Hi,
I have joined just to report this issue.
I am in Australia and bought my Pi 3B+ from Little Bird Electronics and the stock came from Element 14. Bought on 19 March.
My Pi 3B+ runs only Libreelec/Kodi and is connected to my TV by HDMI and to my network by Ethernet. WiFi is disabled.
I use Pulse 8 and control the Pi by using the TV remote.
My Pi locks up as well,, usually when moving through menus with the remote. Just once it rebooted but it can usually only recover with a power cycle. The problem only becomes apparent when I realise that the Pi has stopped responding to the remote control commands.
Libreelec/Kodi is the latest version.
The Pi 3B+ replaced my Pi 3B. The 3B never once gave me any issue at all. Both used with official Pi case and power supply.
I have reported the issue to the retailer and referred them to this thread. Unfortunately they have chosen to blame Lbreelec/Kodi and have insisted that I install and test with Raspian. I have no interest in doing that and don't see it is relevant. They have refused to replace the Pi without me doing this. Considering this is now a well established issue I find this very annoying and disappointing.
So for now I have reverted to the Pi 3B and put the 3B+ back in its box.
Hopefully this issue can be resolved soon and, if not, that all distributors and retailers can be advised so that those of us with faulty boards (if they are faulty) can get replacements or refunds without argument.
I would like to thank Rasp Pi for the wonderfull work they do and hopefully this unususal glitch can soon be resolved.
Ian
The advice to try Raspbian is sound. It's probably got more fixes in than Kodi, since it is the system we do all the dev work on (Kodi lags behind), so trying Raspbian will be a good indicator if the board is one of the real outliers that cannot be tweaked in software. Certainly very relevant, it's the advice we give when anyone is having a problem - get the latest Raspbian and try that.
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jamesh
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Re: Raspberry Pi 3 B+ lockups

Fri May 11, 2018 8:37 am

Tozzi1 wrote:
Thu May 10, 2018 11:45 pm
Well, I'm affected, too.
4 x Pi 3B+ here, all showing the same symptoms (random lockups overnight).
All 4 bought from Amazon.de, 2 sold directly by Amazon, the others by a reseller.
Two were bought in April, the others in May (3 weeks later).

1 of them is set up as my media server (connected to TV via HDMI, via Ethernet to Router with a switch in between, plus via WLAN to another network), the other 2 are just running naked Raspbian so far and are headless (connected via WiFi to my home network).
1 has got a camera module.

So, the problem might be more wide spread than you think.
I switched to 3A power supplies, without luck.
I've never had any of this happen with my older Pi3 Model Bs.

What's odd is that they seem to work better at freq_sdram=500.
I can't provoke the lockups with memtester.
They mostly happen when the machine is completely idle.

Using latest generation SanDisk Ultra SD cards, mostly 64 GB, the media server has a 128 GB one.
CPU Temp does not exceed 55˚C, using FLIRC cases.

I'll try the rpi-update. Otherwise, the system is up-to-date.
Keeping fingers crossed you figure out the cause of these lockups. Currently, I regret having upgraded to the new model (on quite a scale).
That's a weird one. Obviously not the same batch, and to have 4 that exhibit the same problem when we in house have difficulty making anything go wrong with random selections of Pi's is very odd. I can only suggest trying RPI update to get the latest settings. Only working at SDRAM 500 is also very very strange, and does me wonder if there are some environmental issues coming in to play.
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