apport information

** Attachment added: "ProcModules.txt"

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

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

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  Regression in overlayfs between 4.4.0-157 and 4.4.0-159

Status in linux package in Ubuntu:

Bug description:
  My xenial gate jobs began failing after the nodes began running

  The gist of this bug is that a file sitting in /posix.ini for example,
  copied there by ucf from /usr/share/php7.2-common/common/posix.ini,
  cannot be read by non-root users despite its permission bits being
  0644. chmodding 0644 on top of the file fixes this, also rebooting the
  lxc container solves it as well.

  After downgrading the same test node to 4.4.0-157 and re-running the
  same tests, the broken behavior does not occur.

  Please see the attachments for the exact commands used to reproduce this.
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 
2: ls: cannot access '/dev/snd/': No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.20.1-0ubuntu2.19
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 16.04
  IwConfig: Error: [Errno 2] No such file or directory
  Lspci: Error: [Errno 2] No such file or directory
  Lsusb: Error: [Errno 2] No such file or directory
  MachineType: OpenStack Foundation OpenStack Nova
  Package: linux (not installed)
   PATH=(custom, no user)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-159-generic 
root=LABEL=cloudimg-rootfs ro console=tty0 console=ttyS0,115200 no_timer_check 
nofb nomodeset vga=normal
  ProcVersionSignature: Ubuntu 4.4.0-159.187-generic 4.4.185
   linux-restricted-modules-4.4.0-159-generic N/A
   linux-backports-modules-4.4.0-159-generic  N/A
   linux-firmware                             N/A
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  xenial xenial
  UdevDb: Error: [Errno 2] No such file or directory
  Uname: Linux 4.4.0-159-generic x86_64
  UnreportableReason: The report belongs to a package that is not installed.
  UpgradeStatus: No upgrade log present (probably fresh install)
  _MarkForUpload: False 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: 1.10.2-1ubuntu1~cloud0
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-bionic
dmi:bvnSeaBIOS:bvr1.10.2-1ubuntu1~cloud0:bd04/01/2014:svnOpenStackFoundation:pnOpenStackNova:pvr18.2.0:cvnQEMU:ct1:cvrpc-i440fx-bionic: OpenStack Nova
  dmi.product.version: 18.2.0
  dmi.sys.vendor: OpenStack Foundation

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