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Oracle Linux 7 Cloud Instance Experiences Hangs with Kernel Error "detected conn error (1020)"

edited Jun 20, 2022 6:28AM in Linux

An Oracle Linux 7 Cloud instance using iSCSI storage, started to experience many OS commands, such as ps or df hanging. The instance logs showed that the iscsid service had failed to re-establish iscsi connections with the following errors occurring:

Apr 29 03:22:41 <hostname> iscsid: iscsid: Kernel reported iSCSI connection 2:0 error (1020 - ISCSI_ERR_TCP_CONN_CLOSE: TCP connection closed) state (3)

Apr 29 03:22:41 <hostname> iscsid: iscsid: re-opening session 2 (reopen_cnt 0)

Apr 29 03:22:41 <hostname> iscsid: iscsid: disconnecting conn 0x55878c4c6ad8, fd 6

Apr 29 03:22:41 <hostname> kernel: connection2:0: detected conn error (1020)

Apr 29 03:22:43 <hostname> iscsid: iscsid: Poll was woken by an alarm

Apr 29 03:22:43 <hostname> iscsid: iscsid: re-opening session 2 (reopen_cnt 0)

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