RHEL6 Kernel panic with RIP sctp_unhash_established, malformed SCTP packet

Issue

• kernel panic during Codenomicon SCTP tests
• kernel panic with RIP sctp_unhash_established
• Description of the communication which leads to the crash

|Time     | 10.71.0.51                            |
|         |                   | 10.63.18.58       |                   
|14.991   |         INIT      |                   |SCTP: INIT 
|         |(9900)   ------------------>  (5090)   |
|14.991   |         INIT_ACK  |                   |SCTP: INIT_ACK 
|         |(9900)   <------------------  (5090)   |
|15.010   |         COOKIE_ECHO COOKIE_           |SCTP: COOKIE_ECHO COOKIE_ECHO 
|         |(9900)   ------------------>  (5090)   |
|15.011   |         COOKIE_ACK COOKIE_A           |SCTP: COOKIE_ACK COOKIE_ACK 
|         |(9900)   <------------------  (5090)   |
|15.026   |         HEARTBEAT |                   |SCTP: HEARTBEAT 
|         |(9900)   ------------------>  (5090)   |
|15.026   |         HEARTBEAT_ACK                 |SCTP: HEARTBEAT_ACK 
|         |(9900)   <------------------  (5090)   |
|25.109   |         INIT      |                   |SCTP: INIT 
|         |(9900)   ------------------>  (5090)   |
|25.109   |         INIT_ACK  |                   |SCTP: INIT_ACK 
|         |(9900)   <------------------  (5090)   |
|25.126   |         COOKIE_ECHO                   |SCTP: COOKIE_ECHO 
|         |(9900)   ------------------>  (5090)   |
|26.164   |         INIT      |                   |SCTP: INIT 
|         |(9900)   ------------------>  (5090)   |
|28.224   |         INIT      |                   |SCTP: INIT 
|         |(9900)   ------------------>  (5090)   |
|32.307   |         INIT      |                   |SCTP: INIT 
|         |(9900)   ------------------>  (5090)   |
|32.307   |         INIT_ACK  |                   |SCTP: INIT_ACK 
|         |(9900)   <------------------  (5090)   |
|32.321   |         COOKIE_ECHO                   |SCTP: COOKIE_ECHO 
|         |(9900)   ------------------>  (5090)   |
|32.321   |         COOKIE_ACK                    |SCTP: COOKIE_ACK 
|         |(9900)   <------------------  (5090)   |
|32.332   |         HEARTBEAT |                   |SCTP: HEARTBEAT 
|         |(9900)   ------------------>  (5090)   |
|32.332   |         HEARTBEAT_ACK                 |SCTP: HEARTBEAT_ACK 
|         |(9900)   <------------------  (5090)   |
|32.336   |         UNKNOWN [Malformed            |IUA (RFC 3057): UNKNOWN [Malformed Packet]
|         |(9900)   ------------------>  (5090)   |
|32.336   |         SACK      |                   |SCTP: SACK 
|         |(9900)   <------------------  (5090)   |
|32.882   |         UNKNOWN [Malformed            |IUA (RFC 3057): UNKNOWN [Malformed Packet]
|         |(9900)   <------------------  (5090)   |
|32.887   |         SACK      |                   |SCTP: SACK 
|         |(9900)   ------------------>  (5090)   |
|32.888   |         SHUTDOWN  |                   |SCTP: SHUTDOWN 
|         |(9900)   ------------------>  (5090)   |
|32.888   |         SHUTDOWN_ACK                  |SCTP: SHUTDOWN_ACK 
|         |(9900)   <------------------  (5090)   |
|32.892   |         SHUTDOWN_COMPLETE             |SCTP: SHUTDOWN_COMPLETE 
|         |(9900)   ------------------>  (5090)   |