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

[Paul Harrison]

On 13/05/2020 00:42, Peter Bennett wrote:
>
> On 5/12/20 6:43 AM, Paul Harrison wrote:
>> 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.
>
> I am also seeing this now after installing Ubuntu 20.04 and building 
> master.
>
> Also using mariadb - perhaps we should be using a mariadb client 
> library instead of the mysql one (e.g. "libmariadb3 - MariaDB database 
> client library" instead of "libmysqlclient21 - MySQL database client 
> library")
>
> FWIW Here is the backtrace
>
> Core was generated by `mythbackend'.
> Program terminated with signal SIGSEGV, Segmentation fault.
> #0  0x00007f19a640930f in ?? () from 
> /lib/x86_64-linux-gnu/libmysqlclient.so.21
> [Current thread is 1 (Thread 0x7f19a9233340 (LWP 2987))]
> (gdb) bt
> #0  0x00007f19a640930f in  () at 
> /lib/x86_64-linux-gnu/libmysqlclient.so.21
> #1  0x00007f19a640e823 in  () at 
> /lib/x86_64-linux-gnu/libmysqlclient.so.21
> #2  0x00007f19a63ac243 in mysql_server_end () at 
> /lib/x86_64-linux-gnu/libmysqlclient.so.21
> #3  0x00007f19b6ab10ee in  () at 
> /usr/lib/x86_64-linux-gnu/qt5/plugins/sqldrivers/libqsqlmysql.so
> #4  0x00007f19b6ab110d in  () at 
> /usr/lib/x86_64-linux-gnu/qt5/plugins/sqldrivers/libqsqlmysql.so
> #5  0x00007f19b61b05fb in  () at /lib/x86_64-linux-gnu/libQt5Sql.so.5
> #6  0x00007f19b61b088e in QSqlDatabase::~QSqlDatabase() () at 
> /lib/x86_64-linux-gnu/libQt5Sql.so.5
> #7  0x00007f19b61b2901 in  () at /lib/x86_64-linux-gnu/libQt5Sql.so.5
> #8  0x00007f19b5ab345c in QHashData::free_helper(void 
> (*)(QHashData::Node*)) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
> #9  0x00007f19b61b0b4c in  () at /lib/x86_64-linux-gnu/libQt5Sql.so.5
> #10 0x00007f19b61b0cb7 in  () at /lib/x86_64-linux-gnu/libQt5Sql.so.5
> #11 0x00007f19b5c28852 in qt_call_post_routines() () at 
> /lib/x86_64-linux-gnu/libQt5Core.so.5
> #12 0x00007f19b5c289a2 in QCoreApplication::~QCoreApplication() () at 
> /lib/x86_64-linux-gnu/libQt5Core.so.5
> #13 0x000055a1780912ee in main(int, char**) (argc=1, 
> argv=0x7fff14ac53d8) at main.cpp:88
>
>

For reference someone has reported the bug to Ubuntu.

https://bugs.launchpad.net/ubuntu/+source/mysql-8.0/+bug/1877504


Paul H.