RPi hangs/freeze randomly: how to find out the causes??!

[sdjf]

tikidollracer: any ideas how to detect when usage is peaking out before a freeze? I thought that assignment of GPU was dynamic now?

[ivanhoe1024]

Yes, I think it's dynamic... However, right now: uptime 2 days 6 hours and it's still going!! With transmission, sickbeard and samba running!!

If someone has freeze problems and has an hard case for the Pi on it, he/she can try to put the Pi on the side, and not on the bottom, and see if things change!

[ivanhoe1024]

No luck, today the Pi is doing the same old thing... Same freeze... Same ping available but no ssh... Same power off by unplugging... Why the hell is it doing this?!?!?

[sdjf]

tikidollracer's comment about peaking out at high usage seems important, but no response about how to detect this.

My hunch from my own freezes is that memory or cpu or whatever (I get them confused) maxes out too quickly for the situation to be detected in any logs, because when that happens, my pi loses the ability to write the information, or do anything. there has to be a way to detect this, so we can have daemons of some sort monitoring the situation, and forcing a safe shutdown when that happens, before the Pi freezes and forces us to pull the power plugs to reboot.

for me, I think it is when there is too much going on, too many memory intense things happening all at the same time. it might get worse when I reinstall a GUI browser but, right now, I have things set up so my Pi refuses to run VNC viewer if I have spreadsheets open, since that combination seems to cause the freezes. In your case, needing to run a number of memory intense things (?), not running them together is not an option.

Somebody, please, what system state or information could we monitor in heartbeat scripts or daemons that would enable us to determine the need for a safe shutdown or sync/reboot before a freeze?

[dhead666]

Troubleshooting power problems

[ivanhoe1024]

$this->bbcode_second_pass_quote('dhead666', '[')url=http://elinux.org/R-Pi_Troubleshooting#Troubleshooting_power_problems]Troubleshooting power problems[/url]

[tikidollracer]

sorry, i was on hiatus. the gpu memory is supposed to be handled dynamically, but in my experience (and others), it is not working correctly. my experience is that the gpu is reserving gpu_mem + cpu_lwm. i manually changed the boot settings.

http://tikiblog.segosha.net/2014/02/hea ... erver.html

short of dynamically watching the memory i don't know of a way to check this. most software does not check for a valid memory allocation, and even if it did wouldn't have any recourse except to let bad things happen, so you are unlikely to get a diagnostic from a running daemon - which is itself a diagnostic that you may have a memory problem.

[ivanhoe1024]

$this->bbcode_second_pass_quote('tikidollracer', 's')orry, i was on hiatus. the gpu memory is supposed to be handled dynamically, but in my experience (and others), it is not working correctly. my experience is that the gpu is reserving gpu_mem + cpu_lwm. i manually changed the boot settings.

http://tikiblog.segosha.net/2014/02/hea ... erver.html

short of dynamically watching the memory i don't know of a way to check this. most software does not check for a valid memory allocation, and even if it did wouldn't have any recourse except to let bad things happen, so you are unlikely to get a diagnostic from a running daemon - which is itself a diagnostic that you may have a memory problem.

[tikidollracer]

check the blog post i linked for details.

[ivanhoe1024]

$this->bbcode_second_pass_quote('tikidollracer', 'c')heck the blog post i linked for details.