send_meta() called with NULL pointer!

[Chris Maciejewski]

Hi,

I have now upgraded all 40 machines to tinc 1.1pre7. Overall it seems
to be running more stable, however from time to time (once or twice a
week) a random host will crash reporting the following in syslog:

kernel: [12032799.025692] tincd[27725]: segfault at 7fff7e86e870 ip
0000000000419b61 sp 00007fff7e742420 error 4 in tincd[400000+175000]

Is there any way I can help to investigate / fix this issue?

Regards,
Chris

On 28 March 2013 19:35, Guus Sliepen <guus at tinc-vpn.org> wrote:
> On Wed, Mar 27, 2013 at 06:50:45AM +0000, Chris Maciejewski wrote:
>
>> I am running tinc (1.0.19) on a cluster of around 40 servers (Xen
>> virtual machines in two geographical locations). Overall it works very
>> well, however yesterday it crashed on two machines in odd way. I was
>> still able to ping VPN IPs of other hosts from the two affected
>> machines but "vpn" interface was not visible when I run ifconfig.
>> There was also no "tincd" process running (at least ps aux wasn't
>> showing it). They logged the following for approx. 20 minutes in the
>> /var/log/syslog:
>>
>> Mar 27 01:52:14 us16 tinc.vpn[9528]: Flushing meta data to <peer_host>
>> (xxx.xxx.xxx.xxx port 655) failed: Connection reset by peer
>>
>> and eventually:
>>
>> Mar 27 01:53:03 us16 tinc.vpn[9528]: send_meta() called with NULL pointer!
>>
>> Any suggestions what could be the reason for this crash and if
>> upgrading to the latest 1.0.20 might prevent it happening in the
>> future very much appreciated.
>
> I don't know the reason for this crash. Could you send me all tinc's log
> messages from that day to me privately? That would help me debug the problem.
>
> I do not think upgrading to 1.0.20 might help in this case. You might want to
> try 1.1pre6 though, since that is different enough that this bug might not
> appear.
>
> --
> Met vriendelijke groet / with kind regards,
>      Guus Sliepen <guus at tinc-vpn.org>
>
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