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Bug#784688: Thousands of "xen:balloon: Cannot add additional memory (-17) messages" despite dom0 ballooning disabled

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> This is actually useful, because it shows that the issue occurs even with
> Xen 4.6, which I think rules out a Xen side issue (otherwise we'd have had
> lots more reports from 4.4 through to 4.6) and points to a kernel side
> issue somewhere.
>
>> But I checked logs more thoroughly and found it even on more recent
>> kernels:
>> 1) Lot of messages on 3.14-2-amd64 with xen-4.6, 13 domU's.
>
> Just to be clear, "Lots" here means "hundreds or thousands"? I think it is
> expected to see one or two around the time a VM is started or stopped, so
> with 13 domUs a couple of dozen messages wouldn't seem out of line to me.
>
pkg 3.14.15-2
~1600 from last dmesg cleanup which was 23h ago, but all of them 
distributed in last 15h


>> 2) 4.3.0-1-amd64 xen-4.6, only two messages shortly after boot, only 1
>> domU running:
>> [   12.473778] xen:balloon: Cannot add additional memory (-17)
>> [   21.673298] xen:balloon: Cannot add additional memory (-17)
>> uptime 17 days.
>>
>> Previous on same machine was 4.2.0-1-amd64 with more (-17)'s
>
> Was it running xen-4.6 when it was running 4.2.0 or was that also older?

4.3.3-5 xen-4.6.0 and previous 4.2.6-1 xen-4.4.1

>
> Also 4.2.0-1-amd64 is the ABI, not the package version. The package
> versions is either in dpkg or you can find it in /proc/version:
>
> Linux version 4.1.0-2-amd64 (debian-kernel@lists.debian.org) (gcc version 4.9.3 (Debian 4.9.3-3) ) #1 SMP Debian 4.1.6-1 (2015-08-23)
>                ^^^ABI^^^^^^^                                                                               ^^^VERSION^^^^

Ok, if pkg versions is more important, then I updated all data with pkg 
versions in this post


>> 3) 4.3.0-1-amd64, one month, several reboots, average 4 domU's, and no
>> messages
>
> Any idea which Xen?

kernel pkg 4.3.3-5 and 4.3.3-7 and xen-4.6.0

>
>> 4) 3.16.0-4-amd64, xen-4.1, 22 domU's, uptime 188 days, in last month I
>> see only
>> Jan 7 14:12:08
>> Jan 7 14:12:08
>> Jan 7 14:12:08
>> Jan 7 14:12:08
>> Jan 7 14:27:47
>> Jan 7 14:27:47
>> Jan 7 14:27:47
>> Jan 7 14:27:48
>> and this is roughly the time last machine was created(started).

pkg 3.16.7-ckt7-1

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Bug#784688: Thousands of "xen:balloon: Cannot add additional memory (-17) messages" despite dom0 ballooning disabled KSB <ksb@inbox.lv> - 2016-01-22 21:00 +0100
  Bug#784688: Thousands of "xen:balloon: Cannot add additional memory (-17) messages" despite dom0 ballooning disabled Ian Campbell <ijc@debian.org> - 2016-01-25 15:10 +0100
    Bug#784688: Thousands of "xen:balloon: Cannot add additional memory (-17) messages" despite dom0 ballooning disabled KSB <ksb@inbox.lv> - 2016-01-25 19:40 +0100
      Bug#784688: Thousands of "xen:balloon: Cannot add additional memory (-17) messages" despite dom0 ballooning disabled Ian Campbell <ijc@debian.org> - 2016-01-26 11:00 +0100
      Bug#784688: Thousands of "xen:balloon: Cannot add additional memory (-17) messages" despite dom0 ballooning disabled Ian Campbell <ijc@debian.org> - 2016-01-26 13:50 +0100
        Bug#784688: Thousands of "xen:balloon: Cannot add additional memory (-17) messages" despite dom0 ballooning disabled KSB <ksb@inbox.lv> - 2016-01-26 19:00 +0100
          Bug#784688: Thousands of "xen:balloon: Cannot add additional memory (-17) messages" despite dom0 ballooning disabled Ian Campbell <ijc@debian.org> - 2016-01-27 12:10 +0100
            Bug#784688: Thousands of "xen:balloon: Cannot add additional memory (-17) messages" despite dom0 ballooning disabled Chad Dougherty <crd@andrew.cmu.edu> - 2016-01-27 15:40 +0100
            Bug#784688: Thousands of "xen:balloon: Cannot add additional memory (-17) messages" despite dom0 ballooning disabled Ian Campbell <ijc@debian.org> - 2016-01-29 16:10 +0100
              Bug#784688: Thousands of "xen:balloon: Cannot add additional memory (-17) messages" despite dom0 ballooning disabled Andy Smith <andy@strugglers.net> - 2016-01-29 17:10 +0100
                Bug#784688: Thousands of "xen:balloon: Cannot add additional memory (-17) messages" despite dom0 ballooning disabled Ian Campbell <ijc@debian.org> - 2016-02-01 14:20 +0100

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