Slightly modified test app

** Attachment added: "main.cpp"
   
https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1877183/+attachment/5370356/+files/main.cpp

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https://bugs.launchpad.net/bugs/1877183

Title:
  segfault in mysql_server_end() from libmysqlclient.so.21

Status in mysql-8.0 package in Ubuntu:
  Invalid
Status in qtbase-opensource-src package in Ubuntu:
  Invalid

Bug description:
  libmysqlclient.so.21 causes a segfault on shutdown.

  Test case attached ==> "Removed database" will not be reported.

  Backtrace:
  #0  0x00007ffff14c330f in ?? () from 
/lib/x86_64-linux-gnu/libmysqlclient.so.21
  #1  0x00007ffff14c8823 in ?? () from 
/lib/x86_64-linux-gnu/libmysqlclient.so.21
  #2  0x00007ffff1466243 in mysql_server_end () from 
/lib/x86_64-linux-gnu/libmysqlclient.so.21
  #3  0x00007ffff1b4d0ee in ?? () from 
/usr/lib/x86_64-linux-gnu/qt5/plugins/sqldrivers/libqsqlmysql.so
  #4  0x00007ffff1b4d10d in ?? () from 
/usr/lib/x86_64-linux-gnu/qt5/plugins/sqldrivers/libqsqlmysql.so
  #5  0x00007ffff78e55fb in ?? () from /lib/x86_64-linux-gnu/libQt5Sql.so.5
  #6  0x00007ffff78e588e in QSqlDatabase::~QSqlDatabase() () from 
/lib/x86_64-linux-gnu/libQt5Sql.so.5
  #7  0x00007ffff78e5d9c in ?? () from /lib/x86_64-linux-gnu/libQt5Sql.so.5
  #8  0x0000555555555579 in cause_segfault () at main.cpp:16
  #9  0x0000555555555729 in main (argc=1, argv=0x7fffffffeb18) at main.cpp:23

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: libqt5sql5-mysql 5.12.8+dfsg-0ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
  Uname: Linux 5.4.0-29-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: XFCE
  Date: Wed May  6 21:40:58 2020
  InstallationDate: Installed on 2020-04-27 (9 days ago)
  InstallationMedia: Xubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  SourcePackage: qtbase-opensource-src
  UpgradeStatus: No upgrade log present (probably fresh install)

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