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CPU switchover generating core dump "Process Name: cbcp-main.x Thread Name: tsshClientTask"

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TitleCPU switchover generating core dump "Process Name: cbcp-main.x Thread Name: tsshClientTask"
Symptoms
While accessing an external server via SSH from VSP 9000, it results in CPU switch over due to corrupted HMAC. Below is the sequence of events noticed prior to the CP switch over. 
CP1 [08/28/18 13:44:43.820:KST] 0x000d8603 00000000 GlobalRouter SSH INFO Connection from 10.52.29.141 port 59726

CP1 [08/28/18 13:44:43.821:KST] 0x000d858b 00000000 GlobalRouter SSH INFO New connection from ip 10.52.29.141 port 59726

CP1 [08/28/18 13:44:43.822:KST] 0x000d8603 00000000 GlobalRouter SSH INFO Enabling compatibility mode for protocol 2.0

CP1 [08/28/18 13:44:43.823:KST] 0x0003c77a 00000000 GlobalRouter IP INFO kex:chosen algorithms for client->server: encryption:aes128-cbc mac:hmac-sha1 compression:none

CP1 [08/28/18 13:44:43.823:KST] 0x0003c77a 00000000 GlobalRouter IP INFO kex:chosen algorithms for server->client: encryption:aes128-cbc mac:hmac-sha1 compression:none

CP1 [08/28/18 13:44:43.952:KST] 0x000d8602 00000000 GlobalRouter SSH INFO Accepted password for ROOT from 10.52.29.141 port 59726 ssh2

CP1 [08/28/18 13:44:49.079:KST] 0x000d8589 00000000 GlobalRouter SSH INFO SSH: User xxxx login /dev/pts/25 from 10.52.29.141

CP1 [08/28/18 13:44:49.079:KST] 0x00004620 00000000 GlobalRouter SNMP INFO SSH new session login

 

CP1 [08/28/18 13:44:51.422:KST] 0x002c0600 00000000 GlobalRouter CLILOG INFO 2663 SSH:10.52.29.141 xxxx en

CP1 [08/28/18 13:45:02.334:KST] 0x002c0600 00000000 GlobalRouter CLILOG INFO 2664 SSH:10.52.29.141 xxxx ssh 10.182.12.243 -l dudnql4
 

CP1 [08/28/18 13:45:56.907:KST] 0x000d8602 00000000 GlobalRouter SSH INFO Disconnecting: Corrupted HMAC on input.

CP1 [08/28/18 13:45:56.957:KST] 0x0027040c 00000000 GlobalRouter SW INFO Saving flight recorder data

CP1 [08/28/18 13:45:56.958:KST] 0x0027042a 00000000 GlobalRouter SW INFO Stopping process slamon.sh, pid:2871

IO12 [08/28/18 13:45:56.974:KST] 0x0011054c 00000000 GlobalRouter COP-SW INFO Master CP changed to slot 2

IO7 [08/28/18 13:45:56.987:KST] 0x0011054c 00000000 GlobalRouter COP-SW INFO Master CP changed to slot 2

 
Environment
  • VSP 9012/9010
  • Software Version : 4.2.0.0
Cause
Issue noticed is due to a software defect. 
Resolution
The software defect has been documented under JIRA VSP9000-891. Software version which has fix for this issue is 4.2.1.5 or higher. 
 
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