Hi, I've been trying to get a DVD-ROM drive working over iSCSI. I'm using targetcli on the target and iscsiadm/iscsi_discovery on the initiator. Target is running 4.18.16 unpatched from kernel.org, with AMD64 Devuan/Debian stable userland. 10 year old Core 2 Duo CPU. Initiator is running 4.18.15 unpatched from kernel.org with AMD64 Devuan/Debian unstable userland. Ryzen 7 CPU. Using pSCSI backend on /dev/sr0 triggers a memory leak (or infinite loop?) that consumes all 5GB of system RAM on the target in a matter of seconds after attempting a read (I've been testing with "file -s") on the initiator side. It doesn't go into swap memory. I tested pSCSI and IBLOCK backends on a WD Green SSD, and found IBLOCK works fine (I was able to run mkfs.ext4 from the initiator without any memory leak on the target), but pSCSI still seems to trigger a memory leak, albeit a lot slower than with the DVD-ROM. I suspect udev might have something to do with this, as tries to read the volume label off optical discs on insertion. I have attached my targetcli output, and have configured my target-side kernel for coredumping and debugging. If someone can talk me through what to look for, I can poke around in the 5GB vmcore that gets produced by kdump. Please let me know if there's any other information I can provide. Thanks, Ben Klein PS. I have now successfully set up tgtd in passthrough/sg mode, but I'd still like to get to the bottom of why the in-kernel target is not functioning for me. I'm also hoping the in-kernel target may be able to handle encrypted DVD playback, as tgtd can't cope with them.
o- / ......................................................................................................................... [...] o- backstores .............................................................................................................. [...] | o- block .................................................................................................. [Storage Objects: 0] | o- fileio ................................................................................................. [Storage Objects: 0] | o- pscsi .................................................................................................. [Storage Objects: 1] | | o- sr0 .................................................................................................. [/dev/sr0 activated] | o- ramdisk ................................................................................................ [Storage Objects: 0] o- iscsi ............................................................................................................ [Targets: 1] | o- iqn.2003-01.org.linux-iscsi.frankie.x8664:sn.7ff065e33228 ......................................................... [TPGs: 1] | o- tpg1 ............................................................................................... [no-gen-acls, no-auth] | o- acls .......................................................................................................... [ACLs: 1] | | o- iqn.1993-08.org.debian:kubrik ........................................................................ [Mapped LUNs: 1] | | o- mapped_lun1 ................................................................................... [lun1 pscsi/sr0 (rw)] | o- luns .......................................................................................................... [LUNs: 1] | | o- lun1 ........................................................................................... [pscsi/sr0 (/dev/sr0)] | o- portals .................................................................................................... [Portals: 1] | o- 192.168.9.1:3260 ................................................................................................. [OK] o- loopback ......................................................................................................... [Targets: 0] o- vhost ............................................................................................................ [Targets: 0]
