mysqldump freezes hangs at "Releasing Savepoint"

command:

mysqldump -v -f --max_allowed_packet=1G --skip-log-queries --add-locks --single-transaction --dump-date --events --flush-logs --quick --opt --routines --triggers --log-error=/tmp/log.txt --result_file=/tmp/zgx.sql zgx

Last part of log output

– Sending SELECT query...
– Retrieving rows...
– Rolling back to savepoint sp...
– Retrieving table structure for table zgx_zorgovereenkomsten_documenten_audit...
– Sending SELECT query...
– Retrieving rows...
– Rolling back to savepoint sp...
– Retrieving table structure for table zgx_zorgprofielen_wlz...
– Sending SELECT query...
– Retrieving rows...
– Rolling back to savepoint sp...
– Retrieving table structure for table zgx_zorgverzekeraars...
– Sending SELECT query...
– Retrieving rows...
– Rolling back to savepoint sp...
– Retrieving table structure for table zgx_zorgverzekeraars_audit...
– Sending SELECT query...
– Retrieving rows...
– Rolling back to savepoint sp...
– Releasing savepoint...

CPU is now 100% and runs forever