[Bug 1313450] Re: Unable to start vsftpd on Ubuntu 14.04 (Amazon/EC2 or Xen) with default configuration

[Stefan Bader]

As far as I can see from the upstream discussion this is indeed a kernel
issue. Initially it was intended to be fixed by

Author: Mel Gorman <mgorman at suse.de>
    xen: properly account for _PAGE_NUMA during xen pte translations
...
Steven Noonan forwarded a users report where they had a problem starting vsftpd on a Xen paravirtualized guest, with this in dmesg:  BUG: Bad page map in process vsftpd  pte:8000000493b88165 pmd:e9cc01067
...

However the patch got reverted later (which also made it back into 14.04
via stable because it caused regressions on migration.  With v3.15-rc2
there was a new change to address this:

commit 29c7787075c92ca8af353acd5301481e6f37082f
Author: Mel Gorman <mgorman at suse.de>
    mm: use paravirt friendly ops for NUMA hinting ptes

It looks that change (while tagged for stable) has not yet been picked
up for 3.13.

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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

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