Hello Joseph,

I tested the kernel you provide with the commit 2f500a9d7ff6 reverted
and after many reboot to test stability I have not been able to
reproduce the kernel "panic" with the traceback above (see #1).

I have take care that the "noapic" option wasn't pass to grub (like in
#4) and that I boot the provided test kernel (#155~lp1776005). See below
a "paste" to ensure that I'm doing the right test.


I will receive soon other laptops which seems to have a similar symptom
but not exactly the same. Hoping it's a problem related to this commit

In all case, thanks for your time on this issue.

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  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:

  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,


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