Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.16 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as
"Confirmed".


Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16-rc1/


** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Tags added: pti

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

** Changed in: linux (Ubuntu Xenial)
       Status: New => Incomplete

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => High

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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1748710

Title:
  Linux 4.4.0-113.136 (i386/x86_32): failed to boot and BusyBox v1.22.1
  built-in shell (initramfs).

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Xenial:
  Incomplete

Bug description:
  Hello.

  On Thu Feb 8, Linux kernel for Ubuntu 16.04.3 LTS has been updated to
  the 4.4.0-113.136 version (xenial-proposed). However, after reboot,
  plymouth freezes during start, and keys on an USB keyboard were in-
  active. After several seconds, the BusyBox shell screen appeared. It
  looks this way:

  ,------
  | BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1) built-in shell (ash)
  | Enter 'help' for a list of built-in commands.
  |
  | (initramfs) _ 
  `------

  Unfortunately, the USB keyboard does not work and does not respond.
  The only way to solve this issue is a "hard reset" and in GRUB menu
  choosing an earlier kernel, which is linux 4.4.0-112.135. Now,
  everything works okay.

  Proposed update to the Linux 4.4.0-113.136 contains many new updates
  (please see 1.) It's an i386/x86_32 architecture, which does not
  contain PTI yet, right? I'm asking, because mentioned -proposed
  updates contains a couple of PTI-related patches and bugs in PTI can
  cause a few different signatures of crashes etc. For example:

  → Crashes in early boot, especially around CPU bringup.  Bugs in the 
trampoline code or mappings cause these. 
  → Userspace segfaults early in boot, sometimes manifesting as mount(8) 
failing to mount the rootfs.  These have tended to be TLB invalidation issues. 
Usually invalidating the wrong PCID, or otherwise missing an invalidation. 

  NOTE: if it's about PCID, which is mentioned in a second point, there
  is one patch in -proposed update: "x86/mm/32: Move
  setup_clear_cpu_cap(X86_FEATURE_PCID) earlier". Maybe that's is the
  cause of a boot failure? There are no errors in log files, such as
  '/var/log/syslog' or '/var/log/kern.log'. However, it's a Celeron, "E"
  series. So, I don't know if mentioned patches are good for this type
  of processor etc.? Especially on i386/x86_32 architecture.

  ● UPDATE/WARNING: It seems, that 'kaslr' option is responsible for
  this issue. After booting the latest v4.4.0-115.139 kernel, I've had
  the same problems as described above. However, after removing 'kaslr'
  option from a command line via GRUB menu, system started normally etc.
  The latest, working kernel with 'kaslr' option is v4.4.0-112.135.
  According to all of this I think, that 'kaslr' is not compatible with
  some "Spectre & Meltdown" mitigation patches and fixes etc.

  ✗ Release ('/proc/version_signature'): Ubuntu 4.4.0-112.135-generic 4.4.98
  ✗ Architecture: i386/x86_32
  ✗ PCI ('lspci -vnvn'): 00:0a.0 PCI bridge [0604]: NVIDIA Corporation MCP73 
PCI Express bridge [10de:056d] (rev a1) (prog-if 01 [Subtractive decode]) 
Capabilities: [b8] Subsystem: Gigabyte Technology Co., Ltd MCP73 PCI Express 
bridge [1458:026f] 

  Thanks, regards.
  ________________

  1. https://lists.ubuntu.com/archives/xenial-
  changes/2018-February/020108.html

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