Eyal Lebedinsky | 20 May 15:26 2016

[clug] Question about SIP messages

I have an ADSL modem/router that also provides VOIP. Call it 5.
Due to some ADSL sync problems I changed the setup to include a separate ADSL modem.
This one is actually also an ADSL modem/router. call it 55.

Both are configured to remote log to my main server.

I should say that I am not that familiar with SIP and the rest of the telephony protocols,
but this just caught my eye.

On checking the logs, looking for dropped ADSL line messages, I noticed that .55 now
reports this:
	syslog: proxy.c:211 INFO:Outgoing Call from: 026xxxxxxx@...
which I think coincides with me making calls (using VOIP on 5). It lists my VOIP number.

Most of these messages are identical, but not all, I noticed a few unusual ones
	syslog: proxy.c:211 INFO:Outgoing Call from: 8001@...
	syslog: proxy.c:211 INFO:Outgoing Call from: 7001@...
	syslog: proxy.c:211 INFO:Outgoing Call from: 8001@...

I just made a call and got another
	syslog: proxy.c:211 INFO:Outgoing Call from: 8001@...
when the call was of course again from my own VOIP line.

What do these messages mean? Some are not coincident with any of my actual calls.
Maybe some in-band protocol messages? Maybe a proxy is confused on 55?
Probably just me not understanding the protocol.



(Continue reading)

steve jenkin | 17 May 23:37 2016

[clug] Linux scheduler performance bugs + tools for many-core server loads

If you’re running lots of cores hard or doing "Big Data”, this paper is of interest.

The Linux Scheduler: a Decade of Wasted Cores

> In our experiments, these performance bugs caused many-fold (a 138x corner case) performance
degradation for synchronization-heavy scientific applications, 13% higher latency for kernel make,
and a 14- 23% decrease in TPC-H throughput for a widely used commercial database.

Steve Jenkin, IT Systems and Design 
0412 786 915 (+61 412 786 915)
PO Box 48, Kippax ACT 2615, AUSTRALIA

mailto:sjenkin@... http://members.tip.net.au/~sjenkin


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Chris Smart | 13 May 02:33 2016

[clug] AllWinner kernel backdoor


This is interesting because a lot of device manufacturers will just use
the AllWinner kernel as is, so this silent backdoor will be present for
years to come.

They've since silently deleted the debug code off their github pages,
however forks still have the history there, so you can see it here:


The code was added on 2015-06-26 at 7cc9a8fff679f by kevin.z.m with the
commit message:

	update kernel tree:

	1. fix some gpl issue;
	2. release some source code;

It looks like part of the GPL compliance issues the company has been

It was the 8th commit that AllWinner had done on their Linux fork, and
this one in particular added some 176,417 lines of code.



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(Continue reading)

freds72 | 13 May 00:52 2016

[clug] re upgrade fail; hard drive not working

Regarding the external drive not working, seems to be a common problem.  
The article below explains how to fix it, even though it is written for  
windows. The procedures are applicable to linux too.




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Owen Cook | 11 May 08:32 2016

[clug] Upgrade to Ubuntu 16.04 problems - New

I did 15.10 to 16.04 upgrade and the only consequence was that the Synaptic login dialogue refused to accept
my password.

It was fixed by issuing the 'su' command which took my password, and then I was able to set root's password.

The second problem, probably of my own making from installing, and getting functional, the arduino IDE.
The problem is that all my dot files are now in the dialout group, eg

drwxrwxr-x  3 owen dialout       4096 Nov  5  2014 .subversion (a directory)
-rw-------  1 owen dialout        182 May 10 12:47 .Xauthority (a file)

# sudo chown -R owen:owen *  does not remove the dialout group from my files.

I suspect the faulty command was # sudo usermod -g dialout owen  and I think that should have been a capita G
which I did later.

Everything seems to still work, but would appreciate any suggestions how to get rid of the dialout group
from the dot files.




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Steve Walsh | 5 May 16:31 2016

[clug] O/T - LCD TV, Free to a mediocre home.

Hi Folks

I'm trying to dispose of stuff I've been unintentionally hoarding, which 
includes a Teac 32" LCD TV (note NOT LED, but LCD).

The only catch is, it has a dry join somewhere in the chroma section, so 
once the unit warms up, the picture dissolves into a mess of randomly 
coloured very small tiles. Entering winter as we are, you'd think this 
wouldn't be an issue, but, well, it actually is. I'd get stuck into 
repairing it, but I've got enough on my plate, so this is someone list 
members lucky day!

A member of the list, who declined the opportunity to revisit his 
mis-spent youth repairing electronic equipment, is happy to work with 
who ever takes this off my hands to assist them finding and repairing 
the fault should they need it, with the end result of the lucky 
recipient having a working TV, and the person in question being reminded 
of the reason why he stopped repairing electronic equipment.

Otherwise, If no one wants it, It'll go to the green recycling shed.

replies off list if you're interested.


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[clug] Upgrade to Ubuntu 16.04 problems

Hi all, 

My Asus EeePC 1015PX has been running slow since upgrading to Ubuntu 14.04 LTS so I used UbuntuMate which
gave me a better interface but it still was slow. 

On the weekend I made the mistake of trying to upgrade from to Ubuntu 16.04 LTS. I thought it worked and the
upgrade suggested that I run:

sudo apt-get autoremove

I did that and that's when things started to go wrong. (:--(

Maybe I deleted something??? I get a blank screen when I boot up. I have tried choosing the 

"Advanced options for Ubuntu" and then 

Ubuntu.....  4.4.0-21-generic"

Which gives:

".... [ end Kernal panic - not syncing : VFS: Unable to mount root fs on unknown-block(0,0)"

I then tried the:

"Ubuntu..... 3.13. 0-85-generic (recovery mode ) "

and at least got somewhere. I tried each of the nine options. When I choose :

"failsafeX Run in failsafe graphics mode" 

(Continue reading)

Paul Wayper | 2 May 12:41 2016

[clug] MTP and Python - any ideas?

Hi all,

Is anyone familiar with using libmtp to interface with MTP devices?  I'm
trying to write a program to get some information from my phone, but while the
kernel's usbfs module seems quiet happy to see the phone's file systems and
MATE's file manager can browse the device, my simple "get the device name and
free space" program doesn't get much further than the attempting to connect.

The program is:


import pymtp

# Connect to MTP
mtp = pymtp.MTP()

# Show a bit of data about the connection
print "Device name:", mtp.get_devicename()
print "Space:", mtp.get_freespace(), "of", mtp.get_totalspace(), "bytes free"

But I get either:

$ python phontosync.py
Device 0 (VID=04e8 and PID=6860) is a Samsung Galaxy models (MTP).
ignoring libusb_claim_interface() = -6PTP_ERROR_IO: failed to open session,
trying again after resetting USB interface
LIBMTP libusb: Attempt to reset device
inep: usb_get_endpoint_status(): Resource temporarily unavailable
(Continue reading)

Steven Hanley | 27 Apr 08:38 2016

[clug] CLUG Meeting - AARNET Cloudstor - Thursday 2016-04-28 19:00

Can someone please volunteer on the list to bring some plastic cups for
drink consumption with the pizzas. You will be reimbursed.

See below, 18:00 at Wig and Pen for BeerSig
19:00 at N101 for CLUG.

Canberra Linux Users Group Meeting - 24th March 2016

 Date:          28th April 2016 (Fourth Thursday of the month)


 Time:         18:00 - 18:55

 Abstract:     It's BeerSIG time!
               'What's BeerSIG?' I hear you ask! BeerSIG is a social
               gathering, and an opportunity to get together with
               like minded people and share a social pint
               or two before the meeting.

 Location:     Wig and Pen, Llewellyn Hall, Canberra School of Music
               Look for the table with a stuffed toy penguin


 Time:         19:00 - 21:00 (or when it finishes)

 Speaker:      Stephen Walsh

(Continue reading)

steve jenkin | 16 Apr 04:44 2016

[clug] [OT] Hoax 'rm -rf' post on serverfault.

There are multiple interesting points in this:
 - authors not checking sources [multiple media reports]
 - deliberate trolling is alive and well, for many reasons, on technical forums
 - the guy was being a smart-arse, didn’t supply running code, expected people to pickup a deliberate and
subtle omission.
 - lots of “Halt and Catch Fire” class faults still exist in production systems. Defending ourselves
against "own goals" is still important.
 - ‘rm -rf’ destroying the system is a fault of the security & protection model, not a limitation of the
command that needs ‘fixing’.

Hope this is useful to some and entertaining to others.


> On 16 Apr 2016, at 7:30 AM, Trev wrote:
> http://www.techeye.net/business/man-deletes-his-entire-company
> Regards,
> Trev

Hilarious!!! Feel for the guy, know that sinking feeling when the machine room starts to play “Sounds of Silence”.

I’ve Done Stupid Things as well. Some people really do need Adult Supervision.
Including me, protecting me from myself :)

1500 customers. He was doing well.

In 2011, “Distribute.IT” lost sites for 4,800 customers and all its DNS registrations (>5000). It
(Continue reading)

Randall Crook | 15 Apr 00:21 2016

[clug] This months meeting.

Sorry all,

I will be attending some Oracle VM training in Sydney that week and wont
be able to make it.

Randall Crook


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