Hello,

After many contradictory tests, because not reproducible, the only
solution that works on all the laptop where appeared the problem, is to
install the latest kernel 4.4.0.130.136 (proposed) and to uninstall the
package "intel-microcode" and replace it with a dummy package to prevent
the installation of intel microcode, which seems not functional in some
cases. This workaround is far from optimal in terms of updates, but
seems to solve these wired errors.

Best regards,

Sylvain

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

Title:
  kernel instability with BTRFS filesystem as rootfs

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  In Progress

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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