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[triden <1313450@xxxxxxxxxxxxxxxxxx>]

A simple test case was created by Steven Noonan to trigger the issue:

Copy the attached code into a file named bugtest.c
Compile with "gcc -o bugtest bugtest.c"
Run ./bugtest  (does not have to be run as root)
If you see no output, bug does not exist; if it does you will immediately see something similar to:

triden@tweety:~$ ./bugtest
[  837.276658] BUG: Bad page map in process bugtest  pte:8000000000000965 pmd:3c076067
[  837.276666] page:ffffea0000000000 count:-31 mapcount:-31 mapping:          (null) index:0x0
[  837.276669] page flags: 0x10(dirty)
[  837.276672] page dumped because: bad pte
[  837.276674] addr:00007f0639a5e000 vm_flags:08100071 anon_vma:ffff88003b1fdbc0 mapping:          (null) index:7f0639a5e
[  837.276821] BUG: Bad rss-counter state mm:ffff88003d2e8700 idx:0 val:-1
[  837.276825] BUG: Bad rss-counter state mm:ffff88003d2e8700 idx:1 val:1

Reference: https://lkml.org/lkml/2014/1/21/544

** Attachment added: "testcase program"
   https://bugs.launchpad.net/ubuntu/+source/vsftpd/+bug/1313450/+attachment/4129266/+files/xen-bug.txt

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https://bugs.launchpad.net/bugs/1313450

Title:
  Unable to start vsftpd on Ubuntu 14.04 (Amazon/EC2 or Xen) with
  default configuration

Status in “linux” package in Ubuntu:
  Confirmed
Status in “vsftpd” package in Ubuntu:
  Invalid
Status in “linux” source package in Trusty:
  Confirmed
Status in “vsftpd” source package in Trusty:
  Invalid

Bug description:
  The configuration submitted was modified during testing, but this also
  failed with the default configuration. The only solution I have found
  so far was to delete the configuration, this would allow the service
  to start, but obviously not work as intended.

  If I try to start the service manually using vsftpd or sudo vsftpd I receive the following error message:
  500 OOPS: munmap

  I also tried the default commands
  /etc/init.d/vsftpd or service vsftpd start

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: vsftpd 3.0.2-1ubuntu2
  ProcVersionSignature: User Name 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  Date: Sun Apr 27 21:23:18 2014
  Ec2AMI: ami-896c96fe
  Ec2AMIManifest: (unknown)
  Ec2AvailabilityZone: eu-west-1b
  Ec2InstanceType: t1.micro
  Ec2Kernel: aki-52a34525
  Ec2Ramdisk: unavailable
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: vsftpd
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.vsftpd.conf: [modified]
  mtime.conffile..etc.vsftpd.conf: 2014-04-27T21:16:28.222467
  --- 
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  DistroRelease: Ubuntu 14.04
  Ec2AMI: ami-896c96fe
  Ec2AMIManifest: (unknown)
  Ec2AvailabilityZone: eu-west-1b
  Ec2InstanceType: t1.micro
  Ec2Kernel: aki-52a34525
  Ec2Ramdisk: unavailable
  Package: vsftpd 3.0.2-1ubuntu2
  PackageArchitecture: amd64
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: User Name 3.13.0-24.46-generic 3.13.9
  Tags:  trusty ec2-images
  Uname: Linux 3.13.0-24-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dialout dip floppy netdev plugdev sudo video
  _MarkForUpload: True
  modified.conffile..etc.vsftpd.conf: [modified]
  mtime.conffile..etc.vsftpd.conf: 2014-04-29T19:03:28.834467

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