Debian with Apache and TvHeadend: crashes and crashes again

mimu88 · 12-25-2014, 06:52 AM

Hello.
I have installed Debian on a desktop PC and I use it as webserver (apache, only internal LAN) and as tvHeadend server.
It has installed two PCIe TBS DVBS/T cards (Link to product page)
I had to create the file "tbs.conf" in "/etc/modprobe.d" for making working them. Content of the file: "options saa716x_tbs-dvb int_type=1". This tells the driver to start with MSI interrupt support.

It happens again and again, that the machine crashes. It still runs, but is not reachable on the lan and there is no reaction on keyboard inputs. After a cold reset the machine restarts and works again.

At one of the last crashes there were the following messages on the screen:

I added the lines "kernel.panic = 20" and "kernel.panic_on_oops = 20" in the file /etc/sysctl.conf, but this makes no difference. Debian doesn't restart on errors.

What can I try to do?

Thanks.

joe_2000 · 01-12-2015, 05:11 PM

Just ran a quick search for "rcu_sched detected stalls". One of the results that came up was this:

http://serverfault.com/questions/592...-on-cpus-tasks

This seems at least somewhat similar. Might be worth trying the proposed solution of adding "nosmp" to the kernel command line parameters. In case you do not know how to do that:

As root edit /etc/default/grub. There is a line that says something like

Code:

GRUB_CMDLINE_LINUX=""

Change it to

Code:

GRUB_CMDLINE_LINUX="nosmp"

If it already has values you can just append the nosmp. So if e.g. it says

Code:

GRUB_CMDLINE_LINUX="quiet"

Change it to

Code:

GRUB_CMDLINE_LINUX="quiet nosmp"

Then, again as root, run

Code:

update-grub

Then reboot. If it does not help you can go back to the original setting by changing the line back and running update-grub again.

joe_2000 · 01-12-2015, 05:17 PM

Another thought: One thing you could try to isolate potential root causes would be to reinstall from scratch. Start with the base system. See if that crashes. If it doesn't, start installing the software you mentioned package by package, until the crashes reoccur. It would help to see which software package causes the problem.

If it happens right away before you installed any software you may want to try different kernel versions.

Another thought: When you say "desktop PC", does that mean you are running this with Xorg? What happens if you run the machine in headless mode. Does it still crash?