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[Launchpad Bug Tracker <1776005@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu Xenial) because there has been no activity
for 60 days.]

** Changed in: linux (Ubuntu Xenial)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1776005

Title:
  kernel instability with BTRFS filesystem as rootfs

Status in linux package in Ubuntu:
  Expired
Status in linux source package in Xenial:
  Expired

Bug description:
  Hello,

  As explained yesterday on #ubuntu-kernel, several laptop won't boot
  (kernel panic) with the latest kernel 4.4.0-127-generic (x86_64) and
  upper (proposed 4.4.0-128-generic), on Xenial 16.04 LTS

  I have made many tests to verify that the bootloader (GRUB) is
  correctly configured (I have also reinstall it, but same result).

  I have also verified the BTRFS system is clean and not corrupted (with
  a livecd).

  The behavior is unpredictable, because often the kernel fall in
  "panic" during boot, but not all the time, if i do several consecutive
  reboot to test stability of the boot "process". I have no search
  behavior with previous kernels (like 4.4.0-124-generic).

  I suspect (even if I'm quiet disturbed by this behavior, maybe I wrong) that something I changed on last kernel:
  - on BTRFS subsystem, I have "aggregate" BTRFS partitions as rootfs (for a long time)
  - something related with the last mitigation about the recent security processor breach

  But my skills stop here, and I'm not able to find the origin of this behavior despite my efforts.
  I can continue my investigation if I have some additional pointers.

  Thanks for your time,

  Sylvain

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