Here is the relevant portion of the same sequence with mixxx --developer: 

Info [Main]: DbConnection - Available drivers for database connections: ("QIBASE", "QSQLITE", "QMYSQL", "QMYSQL3", "QODBC", "QODBC3", "QPSQL", "QPSQL7", "QTDS", "QTDS7")
Debug [Main]: DbConnection - Opening database connection "MIXXX-1" QSqlDatabase(driver="QSQLITE", database="/home/nmartin/.mixxx/mixxxdb.sqlite", host="localhost", port=-1, user="mixxx", open=false)
Info [Main]: DbConnectionPool - Cloned thread-local database connection "MIXXX-1" QSqlDatabase(driver="QSQLITE", database="/home/nmartin/.mixxx/mixxxdb.sqlite", host="localhost", port=-1, user="mixxx", open=true)
Info [Main]: MixxxMainWindow - Connecting to database
Debug [Main]: DbConnectionPooled - Found thread-local database connection "MIXXX-1" QSqlDatabase(driver="QSQLITE", database="/home/nmartin/.mixxx/mixxxdb.sqlite", host="localhost", port=-1, user="mixxx", open=true)
Info [Main]: MixxxMainWindow - Initializing or upgrading database schema
Info [Main]: SchemaManager - Database schema is up-to-date at version 28
Debug [Main]: LibraryScanner - Starting thread
Debug [Main]: DbConnectionPooled - Found thread-local database connection "MIXXX-1" QSqlDatabase(driver="QSQLITE", database="/home/nmartin/.mixxx/mixxxdb.sqlite", host="localhost", port=-1, user="mixxx", open=true)
Info [Main]: Library - Connecting database
Debug [LibraryScanner 1]: LibraryScanner - Entering thread
Debug [LibraryScanner 1]: DbConnection - Opening database connection "MIXXX-2" QSqlDatabase(driver="QSQLITE", database="/home/nmartin/.mixxx/mixxxdb.sqlite", host="localhost", port=-1, user="mixxx", open=false)
Info [LibraryScanner 1]: DbConnectionPool - Cloned thread-local database connection "MIXXX-2" QSqlDatabase(driver="QSQLITE", database="/home/nmartin/.mixxx/mixxxdb.sqlite", host="localhost", port=-1, user="mixxx", open=true)
Debug [LibraryScanner 1]: DbConnectionPooled - Found thread-local database connection "MIXXX-2" QSqlDatabase(driver="QSQLITE", database="/home/nmartin/.mixxx/mixxxdb.sqlite", host="localhost", port=-1, user="mixxx", open=true)
Debug [Main]: Committing transaction on "MIXXX-1" result: true
Debug [LibraryScanner 1]: LibraryScanner - Event loop starting
Debug [Main]: CrateFeature::rebuildChildModel() -1
Critical [Main]: DEBUG ASSERT: "normalizeName(name) == name" in function void DbNamedEntity<T>::setName(const QString&) [with T = CrateId] at src/util/db/dbnamedentity.h:25
Debug [Main]: Default quick links: ("/run/media/nmartin/6abc4643-4cef-4dc6-b8e2-f30d4c99ca19/DJLib/", "/home/nmartin/Music/", "/home/nmartin/Downloads/", "/home/nmartin/Desktop/", "/home/nmartin/Documents/")
Debug [Main]: Appending Quick Link:  "DJLib" --- "/run/media/nmartin/6abc4643-4cef-4dc6-b8e2-f30d4c99ca19/DJLib/"
Debug [Main]: Appending Quick Link:  "Music" --- "/home/nmartin/Music/"
Debug [Main]: Appending Quick Link:  "Downloads" --- "/home/nmartin/Downloads/"
Debug [Main]: Appending Quick Link:  "Desktop" --- "/home/nmartin/Desktop/"
Debug [Main]: Appending Quick Link:  "Documents" --- "/home/nmartin/Documents/"
Debug [Main]: Committing transaction on "MIXXX-1" result: true
Debug [Main]: Found  "Traktor 2.11.2"
Debug [Main]: Traktor Library Location=[ "/home/nmartin/Documents/Native Instruments/Traktor 2.11.2/collection.nml" ]
Debug [Main]: Checking for access to user's library directories:
Debug [Main]: Checking for access to "/home/nmartin/DJLib" : true
Debug [AnalyzerQueue 1]: AnalyzerQueue - Entering thread
Debug [AnalyzerQueue 1]: DbConnection - Opening database connection "MIXXX-3" QSqlDatabase(driver="QSQLITE", database="/home/nmartin/.mixxx/mixxxdb.sqlite", host="localhost", port=-1, user="mixxx", open=false)
Info [AnalyzerQueue 1]: DbConnectionPool - Cloned thread-local database connection "MIXXX-3" QSqlDatabase(driver="QSQLITE", database="/home/nmartin/.mixxx/mixxxdb.sqlite", host="localhost", port=-1, user="mixxx", open=true)
Debug [Main]: Creating ControllerManager
Debug [AnalyzerQueue 1]: DbConnectionPooled - Found thread-local database connection "MIXXX-3" QSqlDatabase(driver="QSQLITE", database="/home/nmartin/.mixxx/mixxxdb.sqlite", host="localhost", port=-1, user="mixxx", open=true)
Debug [Controller]: ControllerManager:slotInitialize
Segmentation fault (core dumped)