mysql dump global read lock

Hello!

Hereis my mysqldump command line

mysqldump -u root --events --complete-insert --skip-opt 
--single-transaction --add-drop-table --add-locks --create-options 
--disable-keys --
extended-insert --quick --set-charset --routines --triggers --hex-blob  
DB_NAME

But i see tons of Waiting for global read lock
in show processlist for many tables in many different databases for all 
modification queries and locks

Why?  As i understood --skip-opt --single-transaction must disable 
global read lock


mysql version
Server version: 5.6.27-log Source distribution

Artem





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