Public bug reported:

Reference: https://github.com/iovisor/bcc/issues/790

"The bug is: timekeeping: Avoid taking lock in NMI path with
CONFIG_DEBUG_TIMEKEEPING

The fix is: timekeeping: Fix __ktime_get_fast_ns() regression

Looks like that kernel version has the bug but not the fix.
http://changelogs.ubuntu.com/changelogs/pool/main/l/linux/linux_4.4.0-45.66/changelog";

Apparently this is fixed by commit:

commit 58bfea9532552d422bde7afa207e1a0f08dffa7d
Author: John Stultz [email protected]
Date: Tue Oct 4 19:55:48 2016 -0700
timekeeping: Fix __ktime_get_fast_ns() regression

** Affects: linux
     Importance: Unknown
         Status: Unknown

** Affects: linux (Ubuntu)
     Importance: Medium
     Assignee: Colin Ian King (colin-king)
         Status: In Progress

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
       Status: New => In Progress

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Colin Ian King (colin-king)

** Bug watch added: github.com/iovisor/bcc/issues #790
   https://github.com/iovisor/bcc/issues/790

** Also affects: linux via
   https://github.com/iovisor/bcc/issues/790
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1637619

Title:
  ext4dist strange timings on ubuntu 16.04

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