OCI kernel: connectionX:0: detected conn error (1020) (Doc ID 2677308.1)

Last updated on DECEMBER 21, 2023

Applies to:

Symptoms

On OL7 instances iscsid found not trying to re-establish iscsi connections after following error. 

Inspected logs;

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)
Apr 29 03:22:43 <hostname> iscsid: iscsid: connecting to 169.254.2.3:3260
Apr 29 03:22:43 <hostname> iscsid: iscsid: connected local port 37550 to 169.254.2.3:3260
Apr 29 03:22:43 <hostname> iscsid: iscsid: login response status 0000
Apr 29 03:22:43 <hostname> iscsid: iscsid: deleting a scheduled/waiting thread!
Apr 29 03:22:43 <hostname> iscsid: iscsid: connection2:0 is operational after recovery (1 attempts)

There are no iscsid retrying connection entries.

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)

Instead disk io errors are reported. Both disks went into read-only mode.

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 7539813, lost async page write
May 18 21:56:21 <hostname> kernel: JBD: Detected IO errors while flushing file data on sdb

May 18 22:08:37 <hostname> kernel: EXT3-fs (sdb): error: remounting filesystem read-only
May 20 12:06:59 <hostname> kernel: EXT3-fs (sdc): error: remounting filesystem read-only

Changes

Many OS commands like, ps, netstat, df etc hangs.

No packets transfer between the initiator and the iSCSI target block storage is seen via tcpdump.

Cause

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