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[Launchpad Bug Tracker <1830266@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux-azure - 4.18.0-1023.24

---------------
linux-azure (4.18.0-1023.24) cosmic; urgency=medium

  * linux-azure: 4.18.0-1023.24 -proposed tracker (LP: #1833946)

  * [linux-azure] XDP generic fixes (LP: #1831254)
    - netvsc: unshare skb in VF rx handler
    - net: convert rps_needed and rfs_needed to new static
    - net: core: support XDP generic on stacked devices.

  * Enable eBPF JIT in the linux-azure kernels (LP: #1827916)
    - [Config] linux-azure: CONFIG_MLX{4,5}_INFINIBAND=m

  *  Azure: Backport vIOMMU driver (increase vCPU limits) (LP: #1826447)
    - PCI: hv: Replace hv_vp_set with hv_vpset
    - PCI: hv: Refactor hv_irq_unmask() to use cpumask_to_vpset()
    - x86/Hyper-V: Set x2apic destination mode to physical when x2apic is
      available
    - iommu/hyper-v: Add Hyper-V stub IOMMU driver
    - [Config] linux-azure: CONFIG_HYPERV_IOMMU=y

  * [linux-azure] Please Include Mainline Commit ebaf39e6032f  in the 16.04 and
    18.04 linux-azure kernels (LP: #1830266)
    - ipv4: ipv6: netfilter: Adjust the frag mem limit when truesize changes

  * [Packaging] Improve config annotations check on custom kernels
    (LP: #1820075)
    - [Config] linux-azure: Include custom annotations files

  [ Ubuntu: 4.18.0-25.26 ]

  * linux: 4.18.0-25.26 -proposed tracker (LP: #1833952)
  * CVE-2019-11479
    - SAUCE: tcp: add tcp_min_snd_mss sysctl
    - SAUCE: tcp: enforce tcp_min_snd_mss in tcp_mtu_probing()
  * Remote denial of service (resource exhaustion) caused by TCP SACK scoreboard
    manipulation (LP: #1831638) // CVE-2019-11478
    - tcp: refine memory limit test in tcp_fragment()

  [ Ubuntu: 4.18.0-24.25 ]

  * CVE-2019-12817
    - SAUCE: powerpc/mm/64s/hash: Reallocate context ids on fork

 -- Stefan Bader <stefan.bader@xxxxxxxxxxxxx>  Tue, 25 Jun 2019 12:46:06
+0200

** Changed in: linux-azure (Ubuntu Cosmic)
       Status: Fix Committed => Fix Released

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2019-12817

** Changed in: linux-azure (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1830266

Title:
  [linux-azure] Please Include Mainline Commit ebaf39e6032f  in the
  16.04 and 18.04 linux-azure kernels

Status in linux-azure package in Ubuntu:
  Fix Released
Status in linux-azure source package in Xenial:
  Fix Released
Status in linux-azure source package in Cosmic:
  Fix Released

Bug description:
  A team within Microsoft is running the linux-azure Ubuntu kernel on a
  large AI cluster.  They are hitting an issue which is resolved by the
  following commit:

  https://github.com/torvalds/linux/commit/ebaf39e6032faf77218220707fc3fa22487784e0

  
  The bug is that threads can get stuck in the kernel. This bug can happen when removing network namespaces. This is something docker swarm does anytime it removes a container.

  Commit ebaf39e6032f was added to the mainline kernel tree in
  v4.20-rc6. It was not cc’d to upstream stable, so only v4.20-rc6 and
  newer kernels will have it.

  A test kernel was built with this commit, which resolves the issue.

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