** Patch added: 
"0001-UBUNTU-SAUCE-namespace-userns-Export-current_in_user.patch"
   
https://bugs.launchpad.net/ubuntu/xenial/+source/linux/+bug/1617550/+attachment/4731723/+files/0001-UBUNTU-SAUCE-namespace-userns-Export-current_in_user.patch

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https://bugs.launchpad.net/bugs/1617550

Title:
  Kernel Build Fails for Fuse Module

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

Bug description:
  SRU Justification

  Impact: Users attempting to build our xenial kernel tree with fuse as
  a module get an error that current_in_userns in undefined. This is
  because that symbol is not exported to modules.

  Fix: Export the symbol. This is done in the upstream patches, but that
  never got backported to xenial.

  Regression Potential: Virtually zero.

  ---

  ERROR: "current_in_userns" [fs/fuse/fuse.ko] undefined!
  /root/linux-4.4.0/scripts/Makefile.modpost:91: recipe for target '__modpost' 
failed
  make[3]: *** [__modpost] Error 1
  /root/linux-4.4.0/Makefile:1112: recipe for target 'modules' failed
  make[2]: *** [modules] Error 2
  make[2]: Leaving directory '/root/linux-4.4.0/debian/build/build-generic'
  Makefile:146: recipe for target 'sub-make' failed
  make[1]: *** [sub-make] Error 2
  make[1]: Leaving directory '/root/linux-4.4.0'
  debian/rules.d/2-binary-arch.mk:70: recipe for target 
'/root/linux-4.4.0/debian/stamps/stamp-build-generic' failed
  make: *** [/root/linux-4.4.0/debian/stamps/stamp-build-generic] Error 2

  Confirmed working using the following diff:

  https://www.redhat.com/archives/dm-devel/2016-April/msg00388.html

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