[mythtv-users] segfault in libmysqlclient.so.21

[Paul Harrison]

On 12/05/2020 08:43, John wrote:

> On 11/05/2020 13:18, Paul Harrison wrote:
>> On 10/05/2020 16:23, jksjdevelop wrote:
>>
>>> MythTV Version : v31.0-13-g2cd6ccb419
>>> ubuntu 19.10
>>>
>>> I have being experiencing segfaults in mythtv processes since 
>>> libmysqlclient21 was updated from 8.0.17 to 8.0.20 -about a week ago
>>>
>>> Reverting to 8.0.17 does fix it.
>>>
>>> I use10.3.22-MariaDBinstead of Mysql 8.
>>>
>>> A bit of Googling shows nobody else has the same issue.
>>>
>>> Is it likely to be a corner case due to using MariaDB any thoughts?
>>>
>>> mythmetadataloo[2738]: segfault at 8 ip 00007fe22b99623f sp 
>>> 00007ffd4cd34570 error 4 in 
>>> libmysqlclient.so.21.1.20[7fe22b934000+e7000]
>>> mythshutdown[2239]: segfault at 8 ip 00007f9d155f423f sp 
>>> 00007fff10f96010 error 4 in 
>>> libmysqlclient.so.21.1.20[7f9d15592000+e7000]
>>> mythbackend[1691]: segfault at 8 ip 00007fc57cd3023f sp 
>>> 00007ffd3e24e6c0 error 4 in 
>>> libmysqlclient.so.21.1.20[7fc57ccce000+e7000]
>>>
>>>
>>
>> After an update over the weekend I'm seeing this as well.
>>
>>
>> Paul H.
>>
>>
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>
> I can confirm that the issue is not present when using mysql 8 instead 
> of Mariadb.
>
> I spent several hours struggling to switch from MariaDB to mysql on my 
> test system. Got there in the end.
>
> Not looking forward to doing the same with the production system. 
> Suspect I will have to when upgrading to Ubuntu 20.04.
>

John just to be clear can you confirm you are seeing the same issue?

This particular bug affects all MythTV apps that use the database but 
only causes a segfault when exiting the apps. The problem appears to be 
caused by an update to libmysqlclient. Did you recently have an update 
to that?

What distro and version are you using? I'm using Kubuntu 19.10.

There is another bug in MariaDB 10.4 
(https://forum.mythtv.org/viewtopic.php?f=2&t=3720) I just want to be 
sure we are not confusing the two issues.


Paul H.