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[Launchpad Bug Tracker <1682215@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.4.0-78.99

---------------
linux (4.4.0-78.99) xenial; urgency=low

  * linux: 4.4.0-78.99 -proposed tracker (LP: #1686645)

  * Please backport fix to reference leak in cgroup blkio throttle
    (LP: #1683976)
    - block: fix module reference leak on put_disk() call for cgroups throttle

  * UbuntuKVM guest crashed while running I/O stress test with Ubuntu kernel
    4.4.0-47-generic (LP: #1659111)
    - block: Unhash block device inodes on gendisk destruction
    - block: Use pointer to backing_dev_info from request_queue
    - block: Dynamically allocate and refcount backing_dev_info
    - block: Make blk_get_backing_dev_info() safe without open bdev
    - block: Get rid of blk_get_backing_dev_info()
    - block: Move bdev_unhash_inode() after invalidate_partition()
    - block: Unhash also block device inode for the whole device
    - block: Revalidate i_bdev reference in bd_aquire()
    - block: Initialize bd_bdi on inode initialization
    - block: Move bdi_unregister() to del_gendisk()
    - block: Allow bdi re-registration
    - bdi: Fix use-after-free in wb_congested_put()
    - block: Make del_gendisk() safer for disks without queues
    - block: Fix bdi assignment to bdev inode when racing with disk delete
    - bdi: Mark congested->bdi as internal
    - bdi: Make wb->bdi a proper reference
    - bdi: Unify bdi->wb_list handling for root wb_writeback
    - bdi: Shutdown writeback on all cgwbs in cgwb_bdi_destroy()
    - bdi: Do not wait for cgwbs release in bdi_unregister()
    - bdi: Rename cgwb_bdi_destroy() to cgwb_bdi_unregister()
    - block: Fix oops in locked_inode_to_wb_and_lock_list()
    - kobject: Export kobject_get_unless_zero()
    - block: Fix oops scsi_disk_get()

  * Touchpad not working correctly after kernel upgrade (LP: #1662589)
    - Input: ALPS - fix V8+ protocol handling (73 03 28)

  * Xenial update to v4.4.62 stable release (LP: #1683728)
    - drm/i915: Avoid tweaking evaluation thresholds on Baytrail v3
    - drm/i915: Stop using RP_DOWN_EI on Baytrail
    - usb: dwc3: gadget: delay unmap of bounced requests
    - mtd: bcm47xxpart: fix parsing first block after aligned TRX
    - MIPS: Introduce irq_stack
    - MIPS: Stack unwinding while on IRQ stack
    - MIPS: Only change $28 to thread_info if coming from user mode
    - MIPS: Switch to the irq_stack in interrupts
    - MIPS: Select HAVE_IRQ_EXIT_ON_IRQ_STACK
    - MIPS: IRQ Stack: Fix erroneous jal to plat_irq_dispatch
    - crypto: caam - fix RNG deinstantiation error checking
    - Linux 4.4.62

  * ifup service of network device stay active after driver stop (LP: #1672144)
    - net: use net->count to check whether a netns is alive or not

  * [Hyper-V] mkfs regression in kernel 4.4+ (LP: #1682215)
    - block: relax check on sg gap

  * [Feature] KBL: intel_powerclamp driver support (LP: #1591641)
    - thermal/powerclamp: remove cpu whitelist
    - thermal/powerclamp: correct cpu support check
    - thermal/powerclamp: add back module device table

  * sysfs channel reads of lps22hb pressure sensor are stale (LP: #1682103)
    - iio: st_pressure: initialize lps22hb bootime

  * Backlight control does not work and there are no entries in
    /sys/class/backlight (LP: #1667323)
    - Revert "ACPI / video: Add force_native quirk for HP Pavilion dv6"

  * [Feature] KBL: intel_rapl driver support (LP: #1591640)
    - powercap/intel_rapl: Add support for Kabylake

  * Xenial update to v4.4.61 stable release (LP: #1682140)
    - drm/vmwgfx: Type-check lookups of fence objects
    - drm/vmwgfx: NULL pointer dereference in vmw_surface_define_ioctl()
    - drm/vmwgfx: avoid calling vzalloc with a 0 size in vmw_get_cap_3d_ioctl()
    - drm/ttm, drm/vmwgfx: Relax permission checking when opening surfaces
    - drm/vmwgfx: Remove getparam error message
    - drm/vmwgfx: fix integer overflow in vmw_surface_define_ioctl()
    - sysfs: be careful of error returns from ops->show()
    - staging: android: ashmem: lseek failed due to no FMODE_LSEEK.
    - arm/arm64: KVM: Take mmap_sem in stage2_unmap_vm
    - arm/arm64: KVM: Take mmap_sem in kvm_arch_prepare_memory_region
    - iio: bmg160: reset chip when probing
    - Reset TreeId to zero on SMB2 TREE_CONNECT
    - ptrace: fix PTRACE_LISTEN race corrupting task->state
    - ring-buffer: Fix return value check in test_ringbuffer()
    - metag/usercopy: Drop unused macros
    - metag/usercopy: Fix alignment error checking
    - metag/usercopy: Add early abort to copy_to_user
    - metag/usercopy: Zero rest of buffer from copy_from_user
    - metag/usercopy: Set flags before ADDZ
    - metag/usercopy: Fix src fixup in from user rapf loops
    - metag/usercopy: Add missing fixups
    - powerpc/mm: Add missing global TLB invalidate if cxl is active
    - powerpc: Don't try to fix up misaligned load-with-reservation instructions
    - nios2: reserve boot memory for device tree
    - s390/decompressor: fix initrd corruption caused by bss clear
    - s390/uaccess: get_user() should zero on failure (again)
    - MIPS: Force o32 fp64 support on 32bit MIPS64r6 kernels
    - MIPS: ralink: Fix typos in rt3883 pinctrl
    - MIPS: End spinlocks with .insn
    - MIPS: Lantiq: fix missing xbar kernel panic
    - MIPS: Flush wrong invalid FTLB entry for huge page
    - mm/mempolicy.c: fix error handling in set_mempolicy and mbind.
    - Linux 4.4.61

  * Xenial update to v4.4.60 stable release (LP: #1681862)
    - libceph: force GFP_NOIO for socket allocations
    - xen/setup: Don't relocate p2m over existing one
    - scsi: mpt3sas: fix hang on ata passthrough commands
    - scsi: sg: check length passed to SG_NEXT_CMD_LEN
    - scsi: libsas: fix ata xfer length
    - ALSA: seq: Fix race during FIFO resize
    - ALSA: hda - fix a problem for lineout on a Dell AIO machine
    - ASoC: atmel-classd: fix audio clock rate
    - ACPI: Fix incompatibility with mcount-based function graph tracing
    - ACPI: Do not create a platform_device for IOAPIC/IOxAPIC
    - tty/serial: atmel: fix race condition (TX+DMA)
    - tty/serial: atmel: fix TX path in atmel_console_write()
    - USB: fix linked-list corruption in rh_call_control()
    - KVM: x86: clear bus pointer when destroyed
    - drm/radeon: Override fpfn for all VRAM placements in radeon_evict_flags
    - mm, hugetlb: use pte_present() instead of pmd_present() in follow_huge_pmd()
    - MIPS: Lantiq: Fix cascaded IRQ setup
    - rtc: s35390a: fix reading out alarm
    - rtc: s35390a: make sure all members in the output are set
    - rtc: s35390a: implement reset routine as suggested by the reference
    - rtc: s35390a: improve irq handling
    - KVM: kvm_io_bus_unregister_dev() should never fail
    - power: reset: at91-poweroff: timely shutdown LPDDR memories
    - blk: improve order of bio handling in generic_make_request()
    - blk: Ensure users for current->bio_list can see the full list.
    - padata: avoid race in reordering
    - Linux 4.4.60

 -- Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>  Thu, 27 Apr
2017 10:24:08 -0300

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

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https://bugs.launchpad.net/bugs/1682215

Title:
  [Hyper-V] mkfs regression in kernel 4.4+

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  Related bug:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1657539

  This issue was fixed in Zesty, but also impacts the Xenial and Yakkety
  kernels. Can you please pull this patch back to Xenial+?

  https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-
  block.git/commit/?h=for-4.11/block&id=729204ef49ec00b788ce23deb9eb922a5769f55d

  author
  Ming Lei <ming.lei@xxxxxxxxxxxxx>
  2016-12-17 10:49:09 (GMT)
  committer
  Jens Axboe <axboe@xxxxxx>
  2017-01-12 03:47:08 (GMT)
  commit
  729204ef49ec00b788ce23deb9eb922a5769f55d (patch)
  tree
  ab5cc3c0aa17fa8b988ed7dfefe888000fac0be3
  parent
  1661f2e21c8bbf922dcb76faf2126a33ffe4cddb (diff)
  block: relax check on sg gap
  If the last bvec of the 1st bio and the 1st bvec of the next
  bio are physically contigious, and the latter can be merged
  to last segment of the 1st bio, we should think they don't
  violate sg gap(or virt boundary) limit.

  Both Vitaly and Dexuan reported lots of unmergeable small bios
  are observed when running mkfs on Hyper-V virtual storage, and
  performance becomes quite low. This patch fixes that performance
  issue.

  The same issue should exist on NVMe, since it sets virt boundary too.

  Reported-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
  Reported-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
  Tested-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
  Cc: Keith Busch <keith.busch@xxxxxxxxx>
  Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxxxxx>
  Signed-off-by: Jens Axboe <axboe@xxxxxx>

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