yakkety 4.8, missing config CONFIG_USERFAULTFD=y

[Colin Ian King]

The 4.4 kernel has CONFIG_USERFAULTFD=y set, however for Yakkety 4.8 it appears to be missing. This was picked up when running the stress-ng userfault stress tests:

stress-ng --userfaultfd 1
stress-ng: info: [16383] defaulting to a 86400 second run per stressor
stress-ng: info: [16383] dispatching hogs: 1 userfaultfd
stress-ng: info: [16383] cache allocate: default cache size: 8192K
stress-ng: error: [16384] stress-ng-userfaultfd: userfaultfd failed, errno = 38 (Function not implemented)
stress-ng: error: [16383] process 16384 (stress-ng-userfaultfd) terminated with an error, exit status=1
stress-ng: info: [16383] unsuccessful run completed in 0.00s

[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 1626149

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.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.8.0-16.17

---------------
linux (4.8.0-16.17) yakkety; urgency=low

  [ Tim Gardner ]

  * Release Tracking Bug
    - LP: #1626768

  * Support ARM GIC ITS in ACPI mode (LP: #1626631)
    - [Config] CONFIG_ACPI_IORT=y
    - SAUCE: ACPI: I/O Remapping Table (IORT) initial support
    - SAUCE: ACPI: Add new IORT functions to support MSI domain handling
    - SAUCE: irqchip/gicv3-its: Cleanup for ITS domain initialization
    - SAUCE: irqchip/gicv3-its: Refactor ITS DT init code to prepare for ACPI
    - SAUCE: irqchip/gicv3-its: Probe ITS in the ACPI way
    - SAUCE: irqchip/gicv3-its: Factor out PCI-MSI part that might be reused for ACPI
    - SAUCE: irqchip/gicv3-its: Use MADT ITS subtable to do PCI/MSI domain initialization
    - SAUCE: PCI/MSI: Setup MSI domain on a per-device basis using IORT ACPI table

  * 4.8 dropped CONFIG_ATA=y (breaks systemd's TEST-08-ISSUE-2730 upstream test)
    (LP: #1626394)
    - [Config] CONFIG_ATA=y

  * Yakkety: Enable drivers with respect to Xenial (LP: #1626543)
    - [Config] CONFIG_VMD=m
    - [Config] CONFIG_MAC80211_RC_MINSTREL_VHT=y for all arches
    - [Config] CONFIG_OF=y for all arches
    - [Config] CONFIG_BLK_DEV_NVME_SCSI=y
    - [Config] Xenial device settings sync with amd64
    - [Config] Xenial device settings sync with i386
    - [Config] CONFIG_MTD_UBI_GLUEBI=m
    - [Config] Xenial device settings sync with armhf
    - [Config] Xenial device settings sync with arm64

  * yakkety 4.8, missing config CONFIG_USERFAULTFD=y (LP: #1626149)
    - [Config] CONFIG_USERFAULTFD=y

  * 4.8 regression: SLAB is being used instead of SLUB (LP: #1626564)
    - [Config] CONFIG_SLUB=y

  * image won't boot after upgrading to yakkety's 4.8 kernel because efi
    (LP: #1626158)
    - add nls_cp437 to the generic.inclusion-list

 -- Tim Gardner <email address hidden> Thu, 22 Sep 2016 06:51:45 -0600