at #4:

with the newest version of kernel 4.9, namely 4.9-rc7, the problem
mentioned above has disappeared: I can boot correctly with this new
kernel version for lubuntu-17.04. This holds for a lubuntu-17.04 VM
under virtualbox.

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https://bugs.launchpad.net/bugs/1642192

Title:
  i386 4.9 in -proposed fails to boot in cloud instances

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Zesty:
  In Progress

Bug description:
  I noticed a forever-looping test of linuxinfo on i386 this morning.
  This test upgrades the kernel to 4.9 in -proposed; as soon as that
  reboots, the VM never comes back. nova console-log shows:

  [    1.581188] Freeing unused kernel memory: 996K (dcc37000 - dcd30000)
  [    1.582525] Write protecting the kernel text: 8300k
  [    1.583624] Write protecting the kernel read-only data: 3344k
  [    1.584845] NX-protecting the kernel data: 6036k
  [    1.585921] ------------[ cut here ]------------
  [    1.586861] WARNING: CPU: 0 PID: 1 at 
/build/linux-UWDXbt/linux-4.9.0/arch/x86/mm/dump_pagetables.c:225 
note_page+0x6a1/0x880
  [    1.589199] x86/mm: Found insecure W+X mapping at address 
c00a0000/0xc00a0000
  [    1.590657] Modules linked in:
  [    1.591305] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.9.0-1-generic 
#2-Ubuntu
  [    1.592809] Hardware name: OpenStack Foundation OpenStack Nova, BIOS Bochs 
01/01/2011
  [    1.593188]  dae89e70 dc3e0b05 dae89eb4 dca47958 dae89ea0 dc07299a 
dca47920 dae89ed4
  [    1.593188]  00000001 dca47958 000000e1 dc068db1 000000e1 dae89f34 
80000000 00000000
  [    1.593188]  dae89ec0 dc072a06 00000009 00000000 dae89eb4 dca47920 
dae89ed4 76601e21
  [    1.593188] Call Trace:
  [    1.593188]  [<dc3e0b05>] dump_stack+0x58/0x73
  [    1.593188]  [<dc07299a>] __warn+0xea/0x110
  [    1.593188]  [<dc068db1>] ? note_page+0x6a1/0x880
  [    1.593188]  [<dc072a06>] warn_slowpath_fmt+0x46/0x60
  [    1.593188]  [<dc068db1>] note_page+0x6a1/0x880
  [    1.593188]  [<dc069185>] ptdump_walk_pgd_level_core+0x1f5/0x300
  [    1.593188]  [<dc0692c6>] ptdump_walk_pgd_level_checkwx+0x16/0x20
  [    1.593188]  [<dc05eafd>] mark_rodata_ro+0xfd/0x130
  [    1.593188]  [<dc80d800>] ? rest_init+0x70/0x70
  [    1.593188]  [<dc80d82c>] kernel_init+0x2c/0x100
  [    1.593188]  [<dc09d641>] ? schedule_tail+0x11/0x50
  [    1.593188]  [<dc80d800>] ? rest_init+0x70/0x70
  [    1.593188]  [<dc8185c3>] ret_from_fork+0x1b/0x28
  [    1.613361] ---[ end trace d63b34644638754d ]---
  [    1.614368] x86/mm: Checked W+X mappings: FAILED, 96 W+X pages found.
  ...
  Begin: Waiting for root file system ... Begin: Running /scripts/local-block 
... done.
  Begin: Running /scripts/local-block ... done.
  [... repeating some 50 times... ]
  Begin: Running /scripts/local-block ... done.
  done.
  Gave up waiting for root device.  Common problems:
   - Boot args (cat /proc/cmdline)
     - Check rootdelay= (did the system wait long enough?)
     - Check root= (did the system wait for the right device?)
   - Missing modules (cat /proc/modules; ls /dev)
  ALERT!  UUID=ac6eb865-17d6-469d-b58e-8c0d49174fe4 does not exist.  Dropping 
to a shell!

  
  BusyBox v1.22.1 (Ubuntu 1:1.22.0-19ubuntu2) built-in shell (ash)
  Enter 'help' for a list of built-in commands.

  (initramfs)

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