Following login timeout, deadlock in iSCSI due to incorrect target layer error handling

Issue

• Following login timeout, deadlock in iSCSI due to incorrect target layer error handling:

Unable to recover from DataOut timeout while in ERL=0, closing iSCSI connection for I_T Nexus iqn.1991-05.com.<addr>,i,<addr>,iqn.1994-05.com.<addr>,0x01
Unable to recover from DataOut timeout while in ERL=0, closing iSCSI connection for I_T Nexus iqn.1991-05.com.<addr>,i,<addr>,iqn.1994-05.com.<addr>,t,0x01
Unable to recover from DataOut timeout while in ERL=0, closing iSCSI connection for I_T Nexus iqn.1991-05.com.<addr>,i,<addr>,iqn.1994-05.com.<addr>,t,0x01
....
iSCSI Login timeout on Network Portal 0.0.0.0:3260
iSCSI Login negotiation failed.
iSCSI Login timeout on Network Portal 0.0.0.0:3260
iSCSI Login negotiation failed.
iSCSI Login timeout on Network Portal 0.0.0.0:3260
iSCSI Login negotiation failed.
iSCSI Login timeout on Network Portal 0.0.0.0:3260
....
INFO: task kworker/23:0:2690086 blocked for more than 600 seconds.
      Tainted: P           OE    --------- -  - 4.18.0-372.9.1.el8.x86_64 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/23:0    state:D stack:    0 pid:2690086 ppid:     2 flags:0x80004080
Workqueue: events iscsi_target_do_login_rx [iscsi_target_mod]
Call Trace:
 __schedule+0x2d1/0x830
 schedule+0x35/0xa0
 schedule_timeout+0x274/0x300
 ? __kmalloc_track_caller+0x111/0x250
 ? iscsi_decode_text_input+0x307/0x840 [iscsi_target_mod]
 ? kfree+0x1b0/0x1f0
 wait_for_completion+0x96/0x100
 iscsi_check_for_session_reinstatement+0x1e4/0x280 [iscsi_target_mod]
 iscsi_target_do_login+0x21d/0x570 [iscsi_target_mod]
 iscsi_target_do_login_rx+0x288/0x370 [iscsi_target_mod]
 ? iscsi_target_restore_sock_callbacks+0xb0/0xb0 [iscsi_target_mod]
 process_one_work+0x1a7/0x360
....
INFO: task kworker/0:2:2920313 blocked for more than 600 seconds.
      Tainted: P           OE    --------- -  - 4.18.0-372.9.1.el8.x86_64 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:2     state:D stack:    0 pid:2920313 ppid:     2 flags:0x80004080
Workqueue: events target_tmr_work [target_core_mod]
Call Trace:
 __schedule+0x2d1/0x830
 schedule+0x35/0xa0
 schedule_timeout+0x274/0x300
 ? target_append_str+0x44/0x60 [target_core_mod]
 ? __kmalloc_track_caller+0x111/0x250
 ? target_show_cmd+0x8a/0x2e0 [target_core_mod]
 wait_for_completion+0x96/0x100
 target_put_cmd_and_wait+0x6e/0x90 [target_core_mod]
 core_tmr_lun_reset+0x3b1/0x6b0 [target_core_mod]
 target_tmr_work+0xb4/0x110 [target_core_mod]
 process_one_work+0x1a7/0x360