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Ignitsius Jun 13, 2017 @ 3:46pm
Kernel panic not syncing: Fatal exception in interrupt, during install
Hello, while trying to install Steam OS on my new htpc build i get a kernel panic which I cant seem to get around on my own.

Photo of Kernel panic

To rule out hardware problems I tried to install Ubuntu 16.04.2 LTS and it worked without any problems, both installing and booting when done.

Any help apreciated.


System specs
CPU: AMD Ryzen 7 1700
MB: Biostar X370GTN
RAM: 16GB Corsair vengeance LPX (CMK16GX4M2B3200C16R)
GPU: Gigabyte Geforce gtx 560ti
500 GB Samsung 750 evo ssd
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Showing 1-12 of 12 comments
ProfessorKaos64 Jun 13, 2017 @ 6:09pm 
If you don't see anything on https://github.com/ValveSoftware/SteamOS/wiki, submit an issues ticket at the same location.
Hans Wermhat Jun 13, 2017 @ 8:34pm 
What happens when you attempt to boot afterwards? At what point does the install fail?
Ignitsius Jun 14, 2017 @ 5:02am 
Originally posted by ProfessorKaos64:
If you don't see anything on https://github.com/ValveSoftware/SteamOS/wiki, submit an issues ticket at the same location.

I didn't find anything that seemed to be the same issue so will do.
Before I report the issue is there anyway to get logs from the installation process? Just a photo of a tv screen isnt much to go on and I could only find info on how to get logs from an installed os.

Originally posted by Hans Wermhat:
What happens when you attempt to boot afterwards? At what point does the install fail?

The usb key with the installer boots just fine and presents the menu with the installation options (Automatic, Expert and Rescue mode). The kernel panic happens almost directly after choosing any of the options, no matter which one of the options is choosen.
Since the installer never copies any files there is nothing from Steam OS on the disk that i can attempt to boot.

I dont know enough about Linux to know for sure but could this have to do with cpu load balancing / thread scheduling?
ProfessorKaos64 Jun 14, 2017 @ 6:22am 
If you have a network connection, you could save dmesg output to a log file. A wired connection is the easiest if you are able to do that. Cli paste may work good:

dmesg > dmesg-log.txt | curl -F 'sprunge=<-' http://sprunge.us

I would also capure syslog. If you ate root you don't need to do the first line or use sudo in the second.

passwd desktop
sudo cat /car/log/syslog | curl -F 'sprunge=<-' http://sprunge.us

See: sprunge.us

If you can't get a network connection, you'll have to try recovery mode or type out some kind of hint for us from the lot output you see. You can get to recovery mode from the initial boot menu (may need to mash Esc on bootup to pause it since the timeou is very short)
Ignitsius Jun 14, 2017 @ 9:29am 
Sorry no luck in getting any logs.

The esc mashing does nothing while booting from the Steam OS usb, but works if i try booting the Installed Ubuntu.

The only command line related to Steam OS i can reach is the grub command line by pressing C on the initial Steam OS install screen after booting from installation usb.
The commands only return "error: can't find command." in the grub command line.
ProfessorKaos64 Jun 14, 2017 @ 9:41am 
You don't boot from the USB. I had thought you had SteamOS installed but hit the kernrl panic.
Ignitsius Jun 14, 2017 @ 10:54am 
Sorry about the missunderstanding, the kernel panic happens directly after making a choice on the install screen so no files are being copied to the disk at all.

During the weekend I will try putting the disk in another computer, install Steam OS and then put the disk back in the htpc.
That way I should at least be able to get some logs using the commands you sugested when trying to boot from the disk.
Shark Jun 15, 2017 @ 1:30am 
This is probably an issue with either your CPU or your motherboard not being supported by SteamOS yet, since they are very new. Do you have this same issue when trying to install another Linux ditribution?
Ignitsius Jun 15, 2017 @ 4:09pm 
Originally posted by Shark:
This is probably an issue with either your CPU or your motherboard not being supported by SteamOS yet, since they are very new. Do you have this same issue when trying to install another Linux ditribution?

Yes you are probably right about it being some sort of driver issue. From what i can read online kernel version 4.10 is needed / recommended for Ryzen systems and the latest version of Steam OS uses kernel version 4.11.

I have no issues at all when installing and using Ubuntu on the system.
Ignitsius Jun 18, 2017 @ 5:25am 
Now i have installed Steam OS using another computer and then moved the disk to the Ryzen htpc.
When trying to boot normally i get a black screen with a blinking mouse cursor.

However using the recovery mode i managed to dump the dmesg log but not the syslog, it just gave a file not found error.

Dmesg log[sprunge.us]

The following lines kind of stand out to me, mentioning things like firmware bug and kernel taint.

79, 234, 266, 278, 804.

Can anyone more linux knowledgeable determine if they could be related to the kernel panic.

Not Mr Flibble Jun 18, 2017 @ 6:35am 
Another thing to try is to see if it works without the nvidia taintware. Ideally, it'll fail in the same way (which is useful from a debugging point of view).

Re. syslog, make sure that you're trying to read /var/log/syslog. As SteamOS is Debian-based, I'd expect that file still to be there despite the one init to bind them all being in use.

About the ‘bug’ lines in the kernel log – the firmware bugs listed should be harmless, but do see if you can get a BIOS update from the motherboard vendor. You should try booting with “pci=nocrs”. (IIRC, you'll need to press 'E' to edit the kernel command line.)
Ignitsius Jun 18, 2017 @ 9:43am 
I got rid of the taintware using apt-get purge nvidia*, and made new logs (I must have misspelled the file path for syslog last time).

Dmesg [sprunge.us]
Syslog [sprunge.us]

The "pci=nocrs" didn't make much difference but instead of a blinking mouse cursor I got a blue blinking steam logo.

The motherboard shipped with the currently latest bios version, I have never had a biostar motherboard before and dont know how quick they are with updates. However I read rumors that there is going to be a new version out before the end of the month.
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