We have meet a problem of tgtd CPU 100%.
the infinband network card was negotiate as eth mode by mistake,
after we change it to ib mode and restart opensmd for correct State（Active）
the tgtd using 100% of CPU. and when we connect to it using tgtadm,
tgtadm hang forever.
# how to repeat
* tgtd export a disk throught port 3260 of iser
* iscsiadm login a target from tgt through infiniband
* connectx_port_config set the mellanox infiniband to eth mode
* connectx_port_config set the mellanox infiniband to ib mode
* /etc/init.d/opensmd restart
* tgtadm connect to tgt will hang
# error messge
```
Jul 1 21:32:37 shadow tgtd: iser_handle_rdmacm(1628) Unsupported
event:11, RDMA_CM_EVENT_DEVICE_REMOVAL - ignored
Jul 1 21:32:37 shadow tgtd: iser_handle_rdmacm(1628) Unsupported
event:11, RDMA_CM_EVENT_DEVICE_REMOVAL - ignored
Jul 1 21:32:39 shadow tgtd: iser_handle_async_event(3174) dev:mlx4_0
HCA evt: local catastrophic error
Jul 1 21:46:56 shadow tgtd: iser_cm_connect_request(1471)
conn:0x1380bf0 cm_id:0x1380950 rdma_create_qp failed, Cannot allocate
memory
Jul 1 21:46:56 shadow tgtd: iser_cm_connect_request(1520)
cm_id:0x1380950 rdma_reject failed, Bad file descriptor
Jul 1 21:46:56 shadow tgtd: iser_cm_connect_request(1471)
conn:0x1380bf0 cm_id:0x1380950 rdma_create_qp failed, Cannot allocate
memory
Jul 1 21:46:56 shadow tgtd: iser_cm_connect_request(1520)
cm_id:0x1380950 rdma_reject failed, Bad file descriptor
```
# what we found
we have download the lastest 1.0.70 source code and found the problem
in usr/iscsi/iser.c:iser_nop_work_handler()
```
list_for_each_entry(conn, &iser_conn_list, conn_list) {
if (conn->h.state != STATE_FULL)
continue;
task = conn->nop_in_task;
if (!task)
continue;
conn->nop_in_task = NULL;
iser_send_ping_nop_in(task);
}
```
because the conn->h.state will not be STATE_FULL it become a dead loop
of first 3 lines.
Can any one find the reason and fix the problem.
--
pickup.li
