Public bug reported:

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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: linux (Ubuntu Yakkety)
     Importance: Undecided
         Status: Confirmed


** Tags: kernel-4.8

** Attachment added: "dmesg.log"
   https://bugs.launchpad.net/bugs/1627052/+attachment/4747102/+files/dmesg.log

** Also affects: linux (Ubuntu Yakkety)
   Importance: Undecided
       Status: New

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

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

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