While investigating a different problem I found that the smb_mid from smbtorture3 was not correctly incremented. 65914ed8194b141a44 fixes this in master. This bug might lead to long-running client connections like large smbclient transfers and winbind DC connections to fail.
Must-fix for 3.5.0.
Metze, can you ack this change for Karo to include for 3.5.0?
Pushed to v3-5-test.
Closing out bug report.