kernel: connectionX:0: detected conn error (1020)

Applies To:

Oracle Cloud Infrastructure - Version N/A and later

Linux OS - Version Oracle Linux 7.0 and later

Symptoms:

Oracle Linux 7 instances running iSCSI may experience an issue where iscsid does not try to re-establish iSCSI connections after getting connection errors like "1020 - ISCSI_ERR_TCP_CONN_CLOSE: TCP connection closed".

There were no retrying messages at the time. When this happens, the corresponding iSCSI disks would report IO errors and go offline.

May 18 21:50:58 <hostname> kernel: connection2:0: detected conn error (1020)
May 18 21:53:18 <hostname> kernel: connection1:0: detected conn error (1020)

May 18 21:56:21 <hostname> kernel: sd 3:0:0:1: timing out command, waited 180s
May 18 21:56:21 <hostname> kernel: sd 3:0:0:1: [sdb] FAILED Result: hostbyte=DID_IMM_RETRY driverbyte=DRIVER_OK
May 18 21:56:21 <hostname> kernel: sd 3:0:0:1: [sdb] CDB: Write(10) 2a 00 03 98 63 20 00 00 10 00
May 18 21:56:21 <hostname> kernel: blk_update_request: I/O error, dev sdb, sector 60318496
May 18 21:56:21 <hostname> kernel: Buffer I/O error on dev sdb, logical block 7539812, lost async page write
May 18 21:56:21 <hostname> kernel: Buffer I/O error on dev sdb, logical block