I confirm it's fixed in 3.19.0-031900, it's still broken in 14.04.02 LTS with kernel 3.16.0-30-generic. With further testing, whatever is broken was fixed between 3.18rc2 and 3.18rc3 kernels:
Broken: 3.18.0-031800rc2 [1] Fixed: 3.18.0-031800rc3 [2] The number of commits between these two is rather high making it difficult to easily spot what may have fixed the bug; the diff from rc2 to rc3 is 621,132 bytes. The test setup is easy - using VirtualBox, create a new VM accepting all defaults. Install 14.04.02 LTS using all defaults, all very generic. In all broken cases specifying "noautogroup" on the kernel params bypasses the bug. I was able to record a MKV @100fps and extract two PNG files showing the best I can capture; it goes by so fast that even at 100fps I can't capture a few missing lines. [1] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.18-rc2-vivid/ [2] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.18-rc3-vivid/ ** Attachment added: "screencap of crash, 1/2" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1422016/+attachment/4325063/+files/p2146.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1422016 Title: Kernel panic during system boot with sched_autogroup_enabled = 0 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1422016/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
