apport information

** Attachment added: "ProcEnviron.txt"
   
https://bugs.launchpad.net/bugs/1766770/+attachment/5126870/+files/ProcEnviron.txt

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https://bugs.launchpad.net/bugs/1766770

Title:
  4.15.0-15-generic can't find root device

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  This is on a Hewlett-Packard ProLiant DL380 G7, with a Smart Array
  P410i RAID controller containing a RAID 1+0 array of four SATA hard
  drives.

  It's running Ubuntu 16.04 with the linux-image-generic-hwe-16.04-edge
  packages installed.

  The root partition consists of a simple ext4 filesystem on /dev/sda1,
  which is on the RAID array

  There is a more complex secondary mount involving mdraid and bcache
  intended to be mounted at /srv - but we're seeing problems before that
  comes into play.

  Booting into the last 4.13 kernel (4.13.0-39-generic) works fine.

  Booting into the latest 4.15 kernel (4.15.0-15-generic) results in the root 
device not being found, and a stacktrace before an initramfs prompt: 
https://pastebin.ubuntu.com/p/JnTXQ5YP9W/
  --- 
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Apr 25 03:37 seq
   crw-rw---- 1 root audio 116, 33 Apr 25 03:37 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.20.1-0ubuntu2.16
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 16.04
  IwConfig: Error: [Errno 2] No such file or directory
  MachineType: HP ProLiant DL380 G7
  Package: linux (not installed)
  PciMultimedia:
   
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-39-generic 
root=UUID=dd30f756-2a4d-43e5-b49c-dfbafbceea9d ro console=ttyS1,38400 nosplash
  ProcVersionSignature: Ubuntu 4.13.0-39.44~16.04.1-generic 4.13.16
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-39-generic N/A
   linux-backports-modules-4.13.0-39-generic  N/A
   linux-firmware                             1.157.17
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  xenial
  Uname: Linux 4.13.0-39-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm
  _MarkForUpload: True
  dmi.bios.date: 08/16/2015
  dmi.bios.vendor: HP
  dmi.bios.version: P67
  dmi.chassis.type: 23
  dmi.chassis.vendor: HP
  dmi.modalias: 
dmi:bvnHP:bvrP67:bd08/16/2015:svnHP:pnProLiantDL380G7:pvr:cvnHP:ct23:cvr:
  dmi.product.family: ProLiant
  dmi.product.name: ProLiant DL380 G7
  dmi.sys.vendor: HP

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