I am getting similar message at boot but not to Windows target, instead to a DELL EQUALOGIC 100E
Symptom is system hang for a few seconds during boot then it works ok


[   56.363592] ------------[ cut here ]------------
[   56.363604] WARNING: CPU: 1 PID: 415 at /build/linux-hwe-edge-zpduMv/linux-hwe-edge-4.13.0/kernel/softirq.c:161 __local_bh_enable_ip+0x46/0x60
[   56.363606] Modules linked in: mptctl mptbase ebtable_filter ebtables target_core_user uio tcm_qla2xxx qla2xxx nvme_fc nvme_fabrics nvme_core usb_f_tcm tcm_usb_gadget libcomposite udc_core vhost_scsi vhost iscsi_target_mod tcm_loop ib_srpt tcm_fc libfc scsi_transport_fc target_core_file target_core_iblock target_core_pscsi target_core_mod nfnetlink_queue nfnetlink_log nfnetlink bluetooth ecdh_generic dell_rbu bridge stp llc ip6table_filter ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6_tables ipt_REJECT nf_reject_ipv4 xt_conntrack iptable_filter ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_CHECKSUM xt_tcpudp iptable_mangle ip_tables x_tables binfmt_misc zfs(POE) zunicode(POE) zavl(PO) icp(POE) zcommon(POE) znvpair(POE)
[   56.363658]  spl(OE) gpio_ich dcdbas ipmi_ssif joydev input_leds intel_powerclamp coretemp ipmi_si kvm_intel kvm irqbypass intel_cstate ipmi_devintf ipmi_msghandler acpi_power_meter shpchp mac_hid lpc_ich nfsd auth_rpcgss nfs_acl lockd grace sunrpc ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic usbhid hid i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect sysimgblt uas fb_sys_fops drm usb_storage pata_acpi mpt3sas bnx2 raid_class scsi_transport_sas wmi
[   56.363710] CPU: 1 PID: 415 Comm: kworker/1:1H Tainted: P           OE   4.13.0-25-generic #29~16.04.2-Ubuntu
[   56.363710] Hardware name: Dell Inc. PowerEdge T310/02P9X9, BIOS 1.12.0 09/06/2013
[   56.363715] Workqueue: kblockd blk_timeout_work
[   56.363716] task: ffff9a74690b8000 task.stack: ffffa83941174000
[   56.363718] RIP: 0010:__local_bh_enable_ip+0x46/0x60
[   56.363718] RSP: 0018:ffffa83941177d08 EFLAGS: 00010046
[   56.363720] RAX: 0000000000000046 RBX: ffff9a746c6c9330 RCX: ffff9a745884c480
[   56.363720] RDX: ffff9a746c6c93d0 RSI: 0000000000000200 RDI: ffffffffc0560cb3
[   56.363721] RBP: ffffa83941177d08 R08: 0000000000000008 R09: 00000000000001b8
[   56.363721] R10: 0000000000000000 R11: 0000000000007259 R12: ffff9a746c6c93c8
[   56.363722] R13: ffff9a746a499000 R14: ffff9a746c6cac08 R15: ffff9a7468068dd8
[   56.363723] FS:  0000000000000000(0000) GS:ffff9a7476e40000(0000) knlGS:0000000000000000
[   56.363724] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   56.363724] CR2: 00007f2d20bb2f80 CR3: 000000022fc0a005 CR4: 00000000000206e0
[   56.363725] Call Trace:
[   56.363733]  _raw_spin_unlock_bh+0x1e/0x20
[   56.363738]  __iscsi_conn_send_pdu+0x1c3/0x400 [libiscsi]
[   56.363740]  iscsi_send_nopout+0xb7/0x100 [libiscsi]
[   56.363742]  iscsi_eh_cmd_timed_out+0x287/0x290 [libiscsi]
[   56.363745]  scsi_times_out+0x5b/0x1b0
[   56.363746]  blk_rq_timed_out+0x1f/0x60
[   56.363748]  blk_timeout_work+0xae/0x150
[   56.363751]  process_one_work+0x156/0x410
[   56.363752]  worker_thread+0x4b/0x460
[   56.363754]  kthread+0x109/0x140
[   56.363755]  ? process_one_work+0x410/0x410
[   56.363756]  ? kthread_create_on_node+0x70/0x70
[   56.363758]  ret_from_fork+0x1f/0x30
[   56.363759] Code: 90 66 90 f6 c4 02 74 23 83 ee 01 f7 de 65 01 35 41 72 18 43 65 8b 05 3a 72 18 43 a9 00 ff 1f 00 74 0d 65 ff 0d 2c 72 18 43 5d c3 <0f> ff eb d9 65 8b 05 0f 39 19 43 85 c0 74 e8 e8 56 ff ff ff eb
[   56.363777] ---[ end trace e3001acffd34779e ]---