Hi Johannes, sorry for so many comments. Today morning I have reproduce the issue about mutex.97. Please forget the /var/log/messages from 2017-07-15 ... I believe it is to much. The new information is done from 3 systems .. all have the same behavior. But all 3 system was started with the debug kernel. What is strange (in my case) the mutex issue occure always during the startup first. As written in the old information: Later the problem occur in the runnig sessions when one of the two initiator is stopped (destroyed). All three diagnose files contain: 1) hostnamctl 2) /var/log/messages (reduced to the last occourence) 3) iscsi-lio config 4) targetcli ls Best regards Holger P.s.: The overwritten scsi_target_lio behavior in the comments before is further opend. To compare the correct the scsi_target_lio please use the config file from here.