Kernel Build Fails for Fuse Module

[Mark Ridley]

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

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1617550

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Mark Ridley (1-mark-b)]

I am unable to run this command.

[Brad Figg (brad-figg)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-xenial' to 'verification-done-xenial'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Seth Forshee (sforshee)]

Verified that 4.4.0-40.60 builds without error with CONFIG_FUSE_FS=m.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.4.0-42.62

---------------
linux (4.4.0-42.62) xenial; urgency=low

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    - gro: Allow tunnel stacking in the case of FOU/GUE

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    - SAUCE: net: add recursion limit to GRO

linux (4.4.0-41.61) xenial; urgency=low

  [ Kamal Mostafa ]

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linux (4.4.0-40.60) xenial; urgency=low

  [ Kamal Mostafa ]

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      increment value
    - SAUCE: i915_bpo: drm/i915/backlight: setup backlight pwm alternate
      increment on backlight enable

linux (4.4.0-39.59) xenial; urgency=low

  [ Joseph Salisbury ]

  * Release Tracking Bug
    - LP: #1625303

  * thunder: chip errata w/ multiple CQEs for a TSO packet (LP: #1624569)
    - net: thunderx: Fix for issues with multiple CQEs posted for a TSO packet

  * thunder: faulty TSO padding (LP: #1623627)
    - net: thunderx: Fix for HW issue while padding TSO packet

  * CVE-2016-6828
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    (LP: #1619918)
    - btrfs: bugfix: handle FS_IOC32_{GETFLAGS, SETFLAGS, GETVERSION} in
      btrfs_ioctl

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      buffer
    - Drivers: hv: vmbus: Use READ_ONCE() to read variables that are volatile
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