This bug was fixed in the package linux - 4.8.0-17.19

---------------
linux (4.8.0-17.19) yakkety; urgency=low

  * build squashfs into xenial kernels by default (LP: #1593134)
    - Remove squashfs udeb

  * [Yakkety] Fix up ATA_GENERIC to match annotations file. (LP: #1627322)
    - Add d-i support for ata_generic

  * [Yakkety] Fix up CONFIG_BLK_DEV_SD to match annotations (LP: #1627330)
    - [Config] Enforce CONFIG_BLK_DEV_SD=y,CONFIG_BLK_DEV_SR=y

  * [Yakkety] Fix up ATA_PIIX to match annotations file (LP: #1627324)
    - [Config] Enforce CONFIG_ATA_PIIX=y for amd64/i386

  * Yakkety - USB drivers must be built in (LP: #1627323)
    - Update annotation enforcement for CONFIG_USB_[E|O|U|X]HCI_HCD

  * 4.8.0-16.17: genirq: Flags mismatch serial vs goldfish_pdev_bus
    (LP: #1627052)
    - [Config] CONFIG_GOLDFISH=n

  * yakkety 4.8, remove module noise kernel-4.8 (LP: #1626104)
    - Revert "UBUNTU: SAUCE: Clear Linux: bootstats: add printk's to measure 
boot
      time in more detail"

  * Permission denied in CIFS with kernel 4.4.0-38 (LP: #1626112)
    - SAUCE: Fix regression which breaks DFS mounting

  * Miscellaneous Ubuntu changes
    - [Config] apply xenial configuration annotations
    - s390x -- DEBUG_RODATA is now valid
    - [Config] s390x -- CONFIG_SQUASHFS=y
    - [Config] s390x -- CONFIG_ECRYPT_FS=y
    - [Config] Enable CONFIG_ACPI_PCI_SLOT=y for arm64
    - [Config] Enable CONFIG_ACPI_HED=y for arm64
    - [Config] Enable CONFIG_QUICC_ENGINE=y

  * Miscellaneous upstream changes
    - annotations: pull back to xenial

 -- Leann Ogasawara <leann.ogasaw...@canonical.com>  Sat, 24 Sep 2016
21:31:31 -0700

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

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https://bugs.launchpad.net/bugs/1627052

Title:
  4.8.0-16.17: genirq: Flags mismatch serial vs goldfish_pdev_bus

Status in cloud-images:
  New
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  I usually run kvm with '-serial stdio' after adding
  GRUB_CMDLINE_LINUX_DEFAULT="console=ttyS0" to /etc/default/grub.  This
  will give me a serial console where I can login and, more important,
  get kernel logs.

  After install 4.8.0-16.17 I'm unable to login in the serial console,
  and I'm getting a lot of messages:

    genirq: Flags mismatch irq 4. 00000000 (serial) vs. 00000080
  (goldfish_pdev_bus)

  System seems to be working fine otherwise.

  4.8.0-15.16 didn't show this behaviour.

  The obvious suspect commits are the "SAUCE: irqchip/gicv3-its:*" in
  -16, although the several config changes may also be involved.

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