Public bug reported:

I have an HP Spectre x360 Convertible laptop with an Intel 5500U SoC. In
short, I am completely unable to boot kernel 4.12-rc3, even though I
could boot from 4.12-rc2 perfectly fine. The loading screen does not
appear at all, instead GRUB remains stuck on "Loading initial ramdisk
...". Please help. I don't know how to identify what is wrong because I
am completely unable to boot the OS to begin with. Needless to say, this
is a major problem.

Here is my hardware:

H/W path       Device     Class          Description
====================================================
                          system         HP Spectre x360 Convertible (N5R94UA)
/0                        bus            802D
/0/0                      memory         64KiB BIOS
/0/10                     memory         32KiB L1 cache
/0/11                     memory         32KiB L1 cache
/0/12                     memory         256KiB L2 cache
/0/13                     memory         4MiB L3 cache
/0/14                     processor      Intel(R) Core(TM) i7-5500U CPU @ 2.40GH
/0/16                     memory         8GiB System Memory
/0/16/0                   memory         4GiB Row of chips Synchronous 1600 MHz 
/0/16/1                   memory         4GiB Row of chips Synchronous 1600 MHz 
/0/100                    bridge         Broadwell-U Host Bridge -OPI
/0/100/2                  display        Broadwell-U Integrated Graphics
/0/100/3                  multimedia     Broadwell-U Audio Controller
/0/100/14                 bus            Wildcat Point-LP USB xHCI Controller
/0/100/14/0    usb1       bus            xHCI Host Controller
/0/100/14/0/1             input          USB Receiver
/0/100/14/0/3             multimedia     HP Truevision Full HD
/0/100/14/0/4             input          Touchscreen
/0/100/14/0/5             input          ITE Device(8350)
/0/100/14/0/7             communication  Bluetooth wireless interface
/0/100/14/1    usb2       bus            xHCI Host Controller
/0/100/16                 communication  Wildcat Point-LP MEI Controller #1
/0/100/1c                 bridge         Wildcat Point-LP PCI Express Root Port 
/0/100/1c/0               generic        RTS5227 PCI Express Card Reader
/0/100/1c.2               bridge         Wildcat Point-LP PCI Express Root Port 
/0/100/1c.2/0  wlo1       network        Wireless 7265
/0/100/1f                 bridge         Wildcat Point-LP LPC Controller
/0/100/1f.2               storage        Wildcat Point-LP SATA Controller [AHCI 
/0/100/1f.3               bus            Wildcat Point-LP SMBus Controller
/0/1           scsi0      storage        
/0/1/0.0.0     /dev/sda   disk           512GB SAMSUNG MZNTE512
/0/1/0.0.0/1   /dev/sda1  volume         449MiB Windows NTFS volume
/0/1/0.0.0/2   /dev/sda2  volume         99MiB Windows FAT volume
/0/1/0.0.0/3   /dev/sda3  volume         15MiB reserved partition
/0/1/0.0.0/4   /dev/sda4  volume         15EiB Windows FAT volume
/0/1/0.0.0/5   /dev/sda5  volume         838MiB Windows NTFS volume
/0/1/0.0.0/6   /dev/sda6  volume         146GiB Windows NTFS volume
/0/1/0.0.0/7   /dev/sda7  volume         89GiB EXT4 volume
/0/1/0.0.0/8   /dev/sda8  volume         8099MiB Linux swap volume
/1                        power          PK03056XL

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


** Tags: kernel-bug

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https://bugs.launchpad.net/bugs/1694561

Title:
  kernel panic attempting to boot kernel 4.12-rc3

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