I would think Boris is after memory related special settings on the host and 
guest (if you can reveal those). Could be you are hinting that at least for the 
host the config was not modified. I assume still using the xm/xend stack. The 
other info there would be the number assigned to mem of guest type like the one 
we have the dmesg of.
Boris, do you think it would help you to get the dyndbg enabled output?

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https://bugs.launchpad.net/bugs/1304001

Title:
   xen:balloon errors in 14.04 beta

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Xen balloon errors on HVM instances on EC2 (Xen 4.2.amazon):


  
  ubuntu@ip-10-63-20-99:~$ uname -a
  Linux ip-10-63-20-99 3.13.0-23-generic #45-Ubuntu SMP Fri Apr 4 06:58:38 UTC 
2014 x86_64 x86_64 x86_64 GNU/Linux
  ubuntu@ip-10-63-20-99:~$ dmesg  |grep xen
  [    0.000000] xen:events: Xen HVM callback vector for event delivery is 
enabled
  [    0.494613] xen:balloon: Initialising balloon driver
  [    0.496046] xen_balloon: Initialising balloon driver
  [    0.500077] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [    0.541047] Switched to clocksource xen
  [    0.562579] xen: --> pirq=16 -> irq=8 (gsi=8)
  [    0.562622] xen: --> pirq=17 -> irq=12 (gsi=12)
  [    0.562649] xen: --> pirq=18 -> irq=1 (gsi=1)
  [    0.562673] xen: --> pirq=19 -> irq=6 (gsi=6)
  [    0.562705] xen: --> pirq=20 -> irq=4 (gsi=4)
  [    0.920527] xen: --> pirq=21 -> irq=47 (gsi=47)
  [    0.920596] xen:grant_table: Grant tables using version 1 layout
  [    1.029661] xen_netfront: Initialising Xen virtual ethernet driver
  [    1.236083] xenbus_probe_frontend: Device with no driver: device/vfb/0
  [    2.516067] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [    6.533941] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [   14.560075] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [   30.592064] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [   62.688153] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [   94.752164] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  126.816161] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  158.880084] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  190.944069] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  223.008141] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  255.072112] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  287.136190] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  319.200053] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  351.264164] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  383.328080] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  415.392077] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  447.456112] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  479.520128] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  511.584110] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  543.648181] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  575.712070] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  607.776178] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17

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