tinc - Jan 2016 - tinc 1.0.26 on Ubuntu 15.10 x64 sometimes crashes on startup

Hello,

on an x64 ubuntu 15.10 desktop tinc 1.0.26 sometimes crashes on startup
of the machine. eth0 (via good old cat6 cable, no wireless) is
configured to use dhcp. The crash does not happen often, I have seen it
in total maybe 2 or 3 times since installing 15.10 while it was still in
alpha ( July 2015 ) until today. The desktop is not shut down very
often, maybe once a week or every two weeks or even in longer intervals.

I then have to restart tinc
/etc/init.d/tinc restart

After that tinc will run fine for days and weeks and months without
crashing.

If I would have to guess I would bet on some race condition on startup,
maybe tinc is started before there are any configured network interfaces
at all ? Is that even possible ?

Thanks
BR
Max.



# apt-cache showpkg tinc
Package: tinc
Versions:
1.0.26-1
(/var/lib/apt/lists/de.archive.ubuntu.com_ubuntu_dists_wily_universe_binary-amd64_Packages)
(/var/lib/dpkg/status)
 Description Language:
                 File:
/var/lib/apt/lists/de.archive.ubuntu.com_ubuntu_dists_wily_universe_binary-amd64_Packages
                  MD5: 927734357d793d7ebde564ee023d38d2
 Description Language: en
                 File:
/var/lib/apt/lists/de.archive.ubuntu.com_ubuntu_dists_wily_universe_i18n_Translation-en
                  MD5: 927734357d793d7ebde564ee023d38d2


Reverse Depends:
  tinc:i386,tinc
Dependencies:
1.0.26-1 - libc6 (2 2.15) liblzo2-2 (0 (null)) libssl1.0.0 (2 1.0.0)
zlib1g (2 1:1.1.4) tinc:i386 (0 (null))
Provides:
1.0.26-1 -
Reverse Provides:

# cat /etc/issue
Ubuntu 15.10 \n \l

# cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

On Fri, Jan 22, 2016 at 01:32:08PM +0100, Maximilian H. wrote:
> on an x64 ubuntu 15.10 desktop tinc 1.0.26 sometimes crashes on startup
> of the machine. eth0 (via good old cat6 cable, no wireless) is
> configured to use dhcp. The crash does not happen often, I have seen it
> in total maybe 2 or 3 times since installing 15.10 while it was still in
> alpha ( July 2015 ) until today. The desktop is not shut down very
> often, maybe once a week or every two weeks or even in longer intervals.
It would be very helpful if you have some logs of what is happening
during startup. You can edit /etc/default/tinc, and ensure the following
line is present, without a # in front:

EXTRA="-d"

This will enable some debugging. You can change it into "-d5" for a
lot
more debugging messages. But in any case, things should be logged to
/var/log/syslog or /var/log/messages.

-- 
Met vriendelijke groet / with kind regards,
     Guus Sliepen <guus at tinc-vpn.org>
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I have enabled debugging now as per your suggested instructions.

If and when I'll get a new crash I'll send you the debug info.

BR
Max.

>> on an x64 ubuntu 15.10 desktop tinc 1.0.26 sometimes crashes on startup
>> of the machine. eth0 (via good old cat6 cable, no wireless) is
>> configured to use dhcp. The crash does not happen often, I have seen it
>> in total maybe 2 or 3 times since installing 15.10 while it was still
in
>> alpha ( July 2015 ) until today. The desktop is not shut down very
>> often, maybe once a week or every two weeks or even in longer
intervals.
> 
> It would be very helpful if you have some logs of what is happening
> during startup. You can edit /etc/default/tinc, and ensure the following
> line is present, without a # in front:
> 
> EXTRA="-d"
> 
> This will enable some debugging. You can change it into "-d5" for
a lot
> more debugging messages. But in any case, things should be logged to
> /var/log/syslog or /var/log/messages.
> 
> 
> 
> _______________________________________________
> tinc mailing list
> tinc at tinc-vpn.org
> http://www.tinc-vpn.org/cgi-bin/mailman/listinfo/tinc
>