I have made this same bug report upstream at:
https://bugs.kde.org/show_bug.cgi?id=391574


The commands:
- baloosearch --type video test
- baloosearch --type audio test
result in a crash (SIGSEGV) but the commands:
- baloosearch --type text test
- baloosearch --type document test
- baloosearch test
work as expected.

This also affects other programs that use baloosearch (e.g. KDE's dolphin).



The crash backtrace taken with gdb:
(gdb) run --type audio test
<SNIP>
Program received signal SIGSEGV, Segmentation fault.
<SNIP>
(gdb) bt
#0  0x00007ffff6e6e01e in __memcpy_sse2_unaligned () from /lib64/libc.so.6
#1  0x00007ffff723b851 in QByteArray::QByteArray(char const*, int) () from /lib64/libQt5Core.so.5
#2  0x00007ffff6462f97 in DBPostingIterator::DBPostingIterator (this=0x666a60, data=<optimized out>, size=<optimized out>) at /usr/src/debug/baloo-5.42.0/src/engine/postingdb.cpp:177
#3  0x00007ffff6463051 in Baloo::PostingDB::iter (this=this@entry=0x7fffffffd4f0, term=...) at /usr/src/debug/baloo-5.42.0/src/engine/postingdb.cpp:169
#4  0x00007ffff646d0ba in Baloo::Transaction::postingIterator (this=this@entry=0x7fffffffd820, query=...) at /usr/src/debug/baloo-5.42.0/src/engine/transaction.cpp:294
#5  0x00007ffff7bcfb8d in Baloo::SearchStore::constructQuery (this=this@entry=0x7fffffffd8d0, tr=tr@entry=0x7fffffffd820, term=...)
    at /usr/src/debug/baloo-5.42.0/src/lib/searchstore.cpp:190
#6  0x00007ffff7bcfdea in Baloo::SearchStore::constructQuery (this=this@entry=0x7fffffffd8d0, tr=tr@entry=0x7fffffffd820, term=...)
    at /usr/src/debug/baloo-5.42.0/src/lib/searchstore.cpp:164
#7  0x00007ffff7bd0ea0 in Baloo::SearchStore::exec (this=this@entry=0x7fffffffd8d0, term=..., offset=0, limit=-1, sortResults=<optimized out>)
    at /usr/src/debug/baloo-5.42.0/src/lib/searchstore.cpp:76
#8  0x00007ffff7bc01c6 in Baloo::Query::exec (this=this@entry=0x7fffffffd988) at /usr/src/debug/baloo-5.42.0/src/lib/query.cpp:210
#9  0x0000000000402488 in main (argc=4, argv=<optimized out>) at /usr/src/debug/baloo-5.42.0/src/tools/baloosearch/main.cpp:101




System information:

$ uname -a
Linux marte 4.14.20-desktop-1.mga6 #1 SMP Sun Feb 18 01:22:02 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
$ cat /etc/release 
Mageia release 6 (Official) for x86_64
$ baloosearch --version
Baloo 5.42.0
$ rpm -qf $(which baloosearch)
baloo-5.42.0-1.mga6
$ qtdiag | head -n 4
Qt 5.9.4 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 5.4.0) on "xcb" 
OS: Mageia 6 [linux version 4.14.20-desktop-1.mga6]

Architecture: x86_64; features: SSE2 SSE3 SSSE3 SSE4.1