This bug was fixed in the package linux - 4.11.0-10.15

---------------
linux (4.11.0-10.15) artful; urgency=low

  * linux: 4.11.0-10.15 -proposed tracker (LP: #1701271)

  * Artful update to v4.11.8 stable release (LP: #1701269)
    - clk: sunxi-ng: a31: Correct lcd1-ch1 clock register offset
    - clk: sunxi-ng: v3s: Fix usb otg device reset bit
    - clk: sunxi-ng: sun5i: Fix ahb_bist_clk definition
    - xen/blkback: fix disconnect while I/Os in flight
    - xen-blkback: don't leak stack data via response ring
    - ALSA: firewire-lib: Fix stall of process context at packet error
    - ALSA: pcm: Don't treat NULL chmap as a fatal error
    - ALSA: hda - Add Coffelake PCI ID
    - ALSA: hda - Apply quirks to Broxton-T, too
    - fs/exec.c: account for argv/envp pointers
    - powerpc/perf: Fix oops when kthread execs user process
    - autofs: sanity check status reported with AUTOFS_DEV_IOCTL_FAIL
    - fs/dax.c: fix inefficiency in dax_writeback_mapping_range()
    - lib/cmdline.c: fix get_options() overflow while parsing ranges
    - perf/x86/intel: Add 1G DTLB load/store miss support for SKL
    - perf probe: Fix probe definition for inlined functions
    - KVM: x86: fix singlestepping over syscall
    - KVM: MIPS: Fix maybe-uninitialized build failure
    - KVM: s390: gaccess: fix real-space designation asce handling for gmap
      shadows
    - KVM: PPC: Book3S HV: Cope with host using large decrementer mode
    - KVM: PPC: Book3S HV: Preserve userspace HTM state properly
    - KVM: PPC: Book3S HV: Ignore timebase offset on POWER9 DD1
    - KVM: PPC: Book3S HV: Context-switch EBB registers properly
    - KVM: PPC: Book3S HV: Restore critical SPRs to host values on guest exit
    - KVM: PPC: Book3S HV: Save/restore host values of debug registers
    - CIFS: Improve readdir verbosity
    - CIFS: Fix some return values in case of error in 'crypt_message'
    - cxgb4: notify uP to route ctrlq compl to rdma rspq
    - HID: Add quirk for Dell PIXART OEM mouse
    - random: silence compiler warnings and fix race
    - signal: Only reschedule timers on signals timers have sent
    - powerpc/kprobes: Pause function_graph tracing during jprobes handling
    - powerpc/64s: Handle data breakpoints in Radix mode
    - Input: i8042 - add Fujitsu Lifebook AH544 to notimeout list
    - brcmfmac: add parameter to pass error code in firmware callback
    - brcmfmac: use firmware callback upon failure to load
    - brcmfmac: unbind all devices upon failure in firmware callback
    - time: Fix clock->read(clock) race around clocksource changes
    - time: Fix CLOCK_MONOTONIC_RAW sub-nanosecond accounting
    - arm64/vdso: Fix nsec handling for CLOCK_MONOTONIC_RAW
    - target: Fix kref->refcount underflow in transport_cmd_finish_abort
    - iscsi-target: Fix delayed logout processing greater than
      SECONDS_FOR_LOGOUT_COMP
    - iscsi-target: Reject immediate data underflow larger than SCSI transfer
      length
    - drm/radeon: add a PX quirk for another K53TK variant
    - drm/radeon: add a quirk for Toshiba Satellite L20-183
    - drm/amdgpu/atom: fix ps allocation size for EnableDispPowerGating
    - drm/amdgpu: adjust default display clock
    - drm/amdgpu: add Polaris12 DID
    - ACPI / scan: Apply default enumeration to devices with ACPI drivers
    - ACPI / scan: Fix enumeration for special SPI and I2C devices
    - rxrpc: Fix several cases where a padded len isn't checked in ticket decode
    - drm: Fix GETCONNECTOR regression
    - usb: gadget: f_fs: avoid out of bounds access on comp_desc
    - spi: double time out tolerance
    - net: phy: fix marvell phy status reading
    - brcmfmac: fix uninitialized warning in brcmf_usb_probe_phase2()
    - Linux 4.11.8

  * powerpc: Invalidate ERAT on powersave wakeup for POWER9 (LP: #1700521)
    - SAUCE: powerpc: Invalidate ERAT on powersave wakeup for POWER9

  * Miscellaneous Ubuntu changes
    - d-i: Move qcom-emac from arm64 to shared nic-modules

 -- Seth Forshee <seth.fors...@canonical.com>  Thu, 29 Jun 2017 08:46:53
-0500

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

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https://bugs.launchpad.net/bugs/1700521

Title:
  powerpc: Invalidate ERAT on powersave wakeup for POWER9

Status in The Ubuntu-power-systems project:
  Fix Committed
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Zesty:
  Fix Committed

Bug description:
  == Comment: #0 - Breno Leitao <bren...@br.ibm.com> - 2017-06-23 13:13:02 ==
  Hello,

  This is a patch that we need to have on Zesty, including on the
  16.04.3 installer.

  On POWER9 the ERAT may be incorrect on wakeup from some stop states
  that lose state. This causes random segvs and illegal instructions
  when these stop states are enabled.

  This patch invalidates the ERAT on wakeup on POWER9 to prevent this
  from causing a problem.

  
  URL: https://patchwork.ozlabs.org/patch/780365/

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