https://bugs.kde.org/show_bug.cgi?id=439733
--- Comment #1 from gr...@kde.org ---
With some additional debugging added, and a mutex lock on QueryBuilder::exec()
so it is singlethreaded, I get this output (as an indication what Akonadi is
building up):
```
org.kde.pim.akonadiserver: Prepared new query for "SELECT PartTable.id,
PartTable.pimItemId, PartTable.partTypeId, PartTable.data, PartTable.datasize,
PartTable.version, PartTable.storage FROM PartTable WHERE (
PartTable.partTypeId = :0 AND storage = :1 AND data IS NOT NULL )"
org.kde.pim.akonadiserver: Bound 0 QVariant(qlonglong, 1)
org.kde.pim.akonadiserver: Bound 1 QVariant(qlonglong, 1)
Assertion failed: (param->buffer_length != 0), function
setup_one_fetch_function, file
/wrkdirs/usr/ports/databases/mysql57-client/work/mysql-5.7.34/libmysql/libmysql.c,
line 4112.
```
and this slightly-more-detailed backtrace:
```
#0 thr_kill () at thr_kill.S:4
#1 0x0000000800ff71b4 in __raise (s=s@entry=6)
at /usr/src/src/lib/libc/gen/raise.c:52
#2 0x00000008010ac129 in abort () at /usr/src/src/lib/libc/stdlib/abort.c:67
#3 0x0000000800fda0c1 in __assert (func=<optimized out>, file=<optimized out>,
line=<optimized out>, failedexpr=<optimized out>)
at /usr/src/src/lib/libc/gen/assert.c:51
#4 0x0000000805efeb77 in ?? () from /usr/local/lib/mysql/libmysqlclient.so.20
#5 0x0000000805efe5ce in mysql_stmt_bind_result ()
from /usr/local/lib/mysql/libmysqlclient.so.20
#6 0x000000080325fe6f in ?? ()
from /usr/local/lib/qt5/plugins/sqldrivers/libqsqlmysql.so
#7 0x0000000800756da7 in QSqlQuery::exec() ()
from /usr/local/lib/qt5/libQt5Sql.so.5
#8 0x00000000003b9745 in Akonadi::Server::QueryBuilder::exec (
this=<optimized out>)
at /zbigone/src/kde/invent/akonadi/src/server/storage/querybuilder.cpp:418
#9 0x00000000003b4d86 in Akonadi::Server::PartHelper::remove (column=...,
value=...)
at /zbigone/src/kde/invent/akonadi/src/server/storage/parthelper.cpp:108
#10 0x0000000000359fbb in Akonadi::Server::DataStore::unhideAllPimItems (
this=<optimized out>)
at /zbigone/src/kde/invent/akonadi/src/server/storage/datastore.cpp:1177
#11 0x00000000002749f1 in Akonadi::Server::AkonadiServer::init (
this=0x7fffffffd158)
at /zbigone/src/kde/invent/akonadi/src/server/akonadi.cpp:152
```
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