Here Is Why The Linux 4.2 Kernel Is Messing Up On Some Ubuntu Systems

[phoronix]

Phoronix: Here Is Why The Linux 4.2 Kernel Is Messing Up On Some Ubuntu Systems

The Linux 4.2 kernel that's currently under development ships many new features, but as I've been writing about for a while and tweeting, the 4.2 Git code hasn't been booting on many systems in my test lab for over one week. Various Phoronix readers have also been able to reproduce these different kernel panics that happen almost immediately into the boot process. Here's the root problem affecting Linux 4.2 on my daily Linux benchmarking systems...

http://www.phoronix.com/vr.php?view=21826

[Michael_S]

Very cool article, thanks for explaining - at least in an overview - how you figured it out. Oddly enough, I had to use git bisect for the first time last week at my day job.

I had a problem with the Ubuntu 15.10 alpha for a while with it dropping keystrokes. That mysteriously resolved itself. Maybe it was a fluke, or maybe it's related to the funky things they're trying to do to their kernel configuration.

[Marc Driftmeyer]

What does a bunch of photos of your downstairs have to do with kernel panics?

[Michael]

What does a bunch of photos of your downstairs have to do with kernel panics?

Just many of the systems having problems and not having any interesting photos to post for the article otherwise.

[M@yeulC]

I am interested to know how you automatically turn off a system after a kernel panic ? I would personally have set up a hardware watchdog.

[wizard69]

Nice work!

Would the OF confit option be there to support Apple hardware?

[Michael]

Nice work!

Would the OF confit option be there to support Apple hardware?

Doubtful since I've ran several different Mac Minis / Pros / Airs on the mainline kernel PPA that didn't have this option... Only x86 platform I'm aware of using OF is the first OLPC XO.

[BlueJayofEvil]

Ubuntu isn't the only distro with the 4.2-RCs having this issue. I use git snapshots in OpenSUSE and the same thing occurs, so I'm guessing the config options are pulled from upstream?

[Dick Palmer]

I am interested to know how you automatically turn off a system after a kernel panic ? I would personally have set up a hardware watchdog.

Put...

panic=X

...on the kernel boot command: Where "X" is an integer representing the number of seconds to wait after a panic before automatically rebooting (if absent it defaults to infinity).

[asdfblah]

Well, not sure if this helps somehow, but... if you want to log kernel messages remotely, you could use netconsole: https://wiki.archlinux.org/index.php/Netconsole