[Kea-users] kea dhcp4 libmysqlclient segfault

[Marcin Siodelski]

On 20.07.2017 19:47, Juan Settecase - Interlink S.R.L. wrote:
> Hi!
> I'm having a problem with my kea-dhcp4 server(s) falling over regularly
> with a segmentation fault (one , the line I'm seeing in the logs is this:
>
> Jul 19 09:45:00 vmarm kernel: [2429068.963315] kea-dhcp4[5818]: segfault
> at 451 ip 00007f1605d1614c sp 00007ffc59c8a030 error 4 in
> libmysqlclient.so.18.0.0[7f1605ce3000+2b8000]
>
> I've seen anothers mails lists with the same problem but no solution or
> news.
>
> This is the current kea-1.2 built on a Debian 8.7 (fully updated)
> server. Mysql is on the same server. This is our first Kea DHCP Server
> 1.2 on Lab.
>
> Has anyone else seen this? If there's any further debug logging you need
> just let me know.
>
> libmysqlclient18:amd64                 5.5.54-0+deb8u1
> mysql-server-5.5                       5.5.54-0+deb8u1
>
> Thanks in advanced
>
> Juan

Hi Juan,

Thanks for raising your issue. I can hardly tell what it can be without
additional information. Other issues around MySQL, recently brought to
our attention, were related to Kea's shutdown when it detects that the
connection to the MySQL server was broken. This is in fact not the issue
but the way it is currently intended to be.

Your problem seems to be related to something else. Perhaps some data
structures that Kea ships to MySQL are not quite right. Or, the MySQL
client is doing something wrong. A core dump would be useful, as well as
Kea debug log (severity DEBUG, debuglevel 99) to identify what was the
last thing that Kea was doing before the crash.

I think there might be additional data needed, but this is a start.

If sending sensitive data is a concern, you're free to send it directly
to me.

Marcin Siodelski
ISC