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[Launchpad Bug Tracker <1781413@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.15.0-29.31

---------------
linux (4.15.0-29.31) bionic; urgency=medium

  * linux: 4.15.0-29.31 -proposed tracker (LP: #1782173)

  * [SRU Bionic][Cosmic] kernel panic in ipmi_ssif at msg_done_handler
    (LP: #1777716)
    - ipmi_ssif: Fix kernel panic at msg_done_handler

  * Update to ocxl driver for 18.04.1 (LP: #1775786)
    - misc: ocxl: use put_device() instead of device_unregister()
    - powerpc: Add TIDR CPU feature for POWER9
    - powerpc: Use TIDR CPU feature to control TIDR allocation
    - powerpc: use task_pid_nr() for TID allocation
    - ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action
    - ocxl: Expose the thread_id needed for wait on POWER9
    - ocxl: Add an IOCTL so userspace knows what OCXL features are available
    - ocxl: Document new OCXL IOCTLs
    - ocxl: Fix missing unlock on error in afu_ioctl_enable_p9_wait()

  * Critical upstream bugfix missing in Ubuntu 18.04 - frequent Xorg crash after
    suspend (LP: #1776887)
    - ocxl: Document the OCXL_IOCTL_GET_METADATA IOCTL

  * Hard LOCKUP observed on stressing Ubuntu 18 04 (LP: #1777194)
    - powerpc: use NMI IPI for smp_send_stop
    - powerpc: Fix smp_send_stop NMI IPI handling

  * IPL: ppc64_cpu --frequency hang with INFO: rcu_sched detected stalls on
    CPUs/tasks on w34 and wsbmc016 with 920.1714.20170330n (LP: #1773964)
    - rtc: opal: Fix OPAL RTC driver OPAL_BUSY loops

  * [Regression] EXT4-fs error (device sda2): ext4_validate_block_bitmap:383:
    comm stress-ng: bg 4705: bad block bitmap checksum (LP: #1781709)
    - SAUCE: Revert "UBUNTU: SAUCE: ext4: fix ext4_validate_inode_bitmap: comm
      stress-ng: Corrupt inode bitmap"
    - SAUCE: ext4: check for allocation block validity with block group locked

linux (4.15.0-28.30) bionic; urgency=medium

  * linux: 4.15.0-28.30 -proposed tracker (LP: #1781433)

  * Cannot set MTU higher than 1500 in Xen instance (LP: #1781413)
    - xen-netfront: Fix mismatched rtnl_unlock
    - xen-netfront: Update features after registering netdev

linux (4.15.0-27.29) bionic; urgency=medium

  * linux: 4.15.0-27.29 -proposed tracker (LP: #1781062)

  * [Regression] EXT4-fs error (device sda1): ext4_validate_inode_bitmap:99:
    comm stress-ng: Corrupt inode bitmap (LP: #1780137)
    - SAUCE: ext4: fix ext4_validate_inode_bitmap: comm stress-ng: Corrupt inode
      bitmap

linux (4.15.0-26.28) bionic; urgency=medium

  * linux: 4.15.0-26.28 -proposed tracker (LP: #1780112)

  * failure to boot with linux-image-4.15.0-24-generic (LP: #1779827) // Cloud-
    init causes potentially huge boot delays with 4.15 kernels (LP: #1780062)
    - random: Make getrandom() ready earlier

linux (4.15.0-25.27) bionic; urgency=medium

  * linux: 4.15.0-25.27 -proposed tracker (LP: #1779354)

  * hisi_sas_v3_hw: internal task abort: timeout and not done. (LP: #1777736)
    - scsi: hisi_sas: Update a couple of register settings for v3 hw

  * hisi_sas: Add missing PHY spinlock init (LP: #1777734)
    - scsi: hisi_sas: Add missing PHY spinlock init

  * hisi_sas: improve read performance by pre-allocating slot DMA buffers
    (LP: #1777727)
    - scsi: hisi_sas: use dma_zalloc_coherent()
    - scsi: hisi_sas: Use dmam_alloc_coherent()
    - scsi: hisi_sas: Pre-allocate slot DMA buffers

  * hisi_sas: Failures during host reset (LP: #1777696)
    - scsi: hisi_sas: Only process broadcast change in phy_bcast_v3_hw()
    - scsi: hisi_sas: Fix the conflict between dev gone and host reset
    - scsi: hisi_sas: Adjust task reject period during host reset
    - scsi: hisi_sas: Add a flag to filter PHY events during reset
    - scsi: hisi_sas: Release all remaining resources in clear nexus ha

  * Fake SAS addresses for SATA disks on HiSilicon D05 are non-unique
    (LP: #1776750)
    - scsi: hisi_sas: make SAS address of SATA disks unique

  * Vcs-Git header on bionic linux source package points to zesty git tree
    (LP: #1766055)
    - [Packaging]: Update Vcs-Git

  * large KVM instances run out of IRQ routes (LP: #1778261)
    - SAUCE: kvm -- increase KVM_MAX_IRQ_ROUTES to 2048 on x86

 -- Stefan Bader <stefan.bader@xxxxxxxxxxxxx>  Tue, 17 Jul 2018 10:57:50
+0200

** Changed in: linux (Ubuntu)
       Status: Incomplete => Fix Released

-- 
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भाषा समायोजकहरुको समूह, which is subscribed to Xenial.
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https://bugs.launchpad.net/bugs/1781413

Title:
  Cannot set MTU higher than 1500 in Xen instance

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  [Impact]
  The latest Xenial update has broken MTU functionality in Xen: specifically, 
  setting MTUs larger than 1500 fails. This prevents Jumbo Frames and other 
  features which require larger than 1500 byte MTUs from being used. This can 
  lead to a failure to sync/connect to other components in the cluster/cloud
  which expect higher MTUs and result in unavailable services. 

  This can be worked around by manually using ethtool to set SCATTER/GATHER
  functionality:
  - $ sudo ethtool -K $interface_name sg on 

  
  The issue is caused by the following commit to the xen-netfront driver:
  "xen-netfront: Fix race between device setup and open"
  commit f599c64fdf7d9c108e8717fb04bc41c680120da4
  Introduced: v4.16-rc1

  Reverting the above fix has confirmed that the problem goes away.

  The following commits fix this issue in the mainline kernel:

  "xen-netfront: Fix mismatched rtnl_unlock"
  commit cb257783c2927b73614b20f915a91ff78aa6f3e8
  Introduced: v4.18-rc3
  "xen-netfront: Update features after registering netdev"
  commit 45c8184c1bed1ca8a7f02918552063a00b909bf5
  Introduced: v4.18-rc3

  
  [Test Case]
  1. Launch a Xen instance using the latest kernel version (e.g. 4.4.0-130,
  or  4.4.0-1062-aws)
  2. Change MTU to 9000 or other value > 1500. 

  [Regression Potential]
  The kernel patch might not be able to set MTU.

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