Hi Nick,
We are seeing the below kernel crash with a block backstore.
The steps to reproduce are: Discovered a new iSCSI volume, created a new ibmvscsis instance, mapped it.
[ 7872.359650] scsi host6: iSCSI Initiator over TCP/IP
[ 7872.621777] scsi 6:0:0:0: Direct-Access IBM 2145 0000 PQ: 0 ANSI: 6
[ 7872.665105] sd 6:0:0:0: Attached scsi generic sg14 type 0
[ 7872.665600] sd 6:0:0:0: [sdg] 2097152 512-byte logical blocks: (1.07 GB/1.00 GiB)
[ 7872.666986] sd 6:0:0:0: [sdg] Write Protect is off
[ 7872.666990] sd 6:0:0:0: [sdg] Mode Sense: 97 00 10 08
[ 7872.667691] sd 6:0:0:0: [sdg] Write cache: disabled, read cache: enabled, supports DPO and FUA
[ 7872.680928] sd 6:0:0:0: [sdg] Attached SCSI disk
[ 7877.289863] rpadlpar_io: slot U8247.22L.212A91A-V1-C8 added
[ 7879.893760] ------------[ cut here ]------------
[ 7879.893768] WARNING: CPU: 15 PID: 17585 at ./include/linux/kref.h:46 config_item_get+0x7c/0x90 [configfs]
[ 7879.893768] Modules linked in: target_core_pscsi target_core_file target_core_iblock rpadlpar_io rpaphp ip6table_raw xt_CT xt_mac xt_tcpudp xt_comment xt_physdev xt_set ip_set_hash_net ip_set iscsi_target_mod iptable_raw dccp_diag dccp tcp_diag udp_diag inet_diag unix_diag af_packet_diag netlink_diag openvswitch nf_nat_ipv6 libcrc32c target_core_user uio binfmt_misc pseries_rng ibmvmc(O) vmx_crypto rtc_generic xt_conntrack nf_nat_ftp nf_conntrack_ftp nf_conntrack_netlink nfnetlink nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv6 nf_defrag_ipv6 nbd ipt_REJECT nf_reject_ipv4 ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_filter ip_tables ip6table_filter ip6_tables ebtables x_tables br_netfilter
[ 7879.893797] bridge stp llc ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 ses enclosure scsi_transport_sas ibmvscsis target_core_mod configfs ibmvscsi ibmveth(O) qla2xxx scsi_transport_fc ipr
[ 7879.893811] CPU: 15 PID: 17585 Comm: targetcli Tainted: G O 4.8.17-customv2.22 #12
[ 7879.893812] task: c00000018a0d3400 task.stack: c0000001f3b40000
[ 7879.893813] NIP: d000000002c664ec LR: d000000002c60980 CTR: c000000000b70870
[ 7879.893814] REGS: c0000001f3b43810 TRAP: 0700 Tainted: G O (4.8.17-customv2.22)
[ 7879.893815] MSR: 8000000000029033 <SF,EE,ME,IR,DR,RI,LE> CR: 28222242 XER: 00000000
[ 7879.893820] CFAR: d000000002c664bc SOFTE: 1
GPR00: d000000002c60980 c0000001f3b43a90 d000000002c70908 c0000000fbc06820
GPR04: c0000001ef1bd900 0000000000000004 0000000000000001 0000000000000000
GPR08: 0000000000000000 0000000000000001 d000000002c69560 d000000002c66d80
GPR12: c000000000b70870 c00000000e798700 c0000001f3b43ca0 c0000001d4949d40
GPR16: c00000014637e1c0 0000000000000000 0000000000000000 c0000000f2392940
GPR20: c0000001f3b43b98 0000000000000041 0000000000600000 0000000000000000
GPR24: fffffffffffff000 0000000000000000 d000000002c60be0 c0000001f1dac490
GPR28: 0000000000000004 0000000000000000 c0000001ef1bd900 c0000000f2392940
[ 7879.893839] NIP [d000000002c664ec] config_item_get+0x7c/0x90 [configfs]
[ 7879.893841] LR [d000000002c60980] check_perm+0x80/0x2e0 [configfs]
[ 7879.893842] Call Trace:
[ 7879.893844] [c0000001f3b43ac0] [d000000002c60980] check_perm+0x80/0x2e0 [configfs]
[ 7879.893847] [c0000001f3b43b10] [c000000000329770] do_dentry_open+0x2c0/0x460
[ 7879.893849] [c0000001f3b43b70] [c000000000344480] path_openat+0x210/0x1490
[ 7879.893851] [c0000001f3b43c80] [c00000000034708c] do_filp_open+0xfc/0x170
[ 7879.893853] [c0000001f3b43db0] [c00000000032b5bc] do_sys_open+0x1cc/0x390
[ 7879.893856] [c0000001f3b43e30] [c000000000009584] system_call+0x38/0xec
[ 7879.893856] Instruction dump:
[ 7879.893858] 409d0014 38210030 e8010010 7c0803a6 4e800020 3d220000 e94981e0 892a0000
[ 7879.893861] 2f890000 409effe0 39200001 992a0000 <0fe00000> 4bffffd0 60000000 60000000
[ 7879.893866] ---[ end trace 14078f0b3b5ad0aa ]---
[ 7912.992583] sd 6:0:0:0: [sdg] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 7912.992587] sd 6:0:0:0: [sdg] tag#0 Sense Key : Illegal Request [current]
[ 7912.992589] sd 6:0:0:0: [sdg] tag#0 Add. Sense: Logical unit not supported
[ 7912.992591] sd 6:0:0:0: [sdg] tag#0 CDB: Read(10) 28 00 00 00 00 00 00 00 80 00
[ 7912.992593] blk_update_request: I/O error, dev sdg, sector 0
-Bryant
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