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mpls process crashes with signal 11 while changing LSR id

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Titlempls process crashes with signal 11 while changing LSR id
Symptoms
  • System crash
  • Loss of network connectivity
Environment
  • Summit 
  • Black Diamond
  • EXOS 16.1.1
Cause
Creating duplicate loopback address can cause changes to LSR id which in turn triggers MPLS process crash across all switches in the network.

Scenario would be as follows:
1) Create a duplicate loop back LSR IP (which might be the highest IP address than the existing one) in a switch and it will replace the existing LSR IP only by reboot.
2) Reboot the switch (manually) to make it effect.
3) Once the new LSR IP is in effect on the switch and it will update the information to all the switches which make all the switches crashes.
 
Error Messages:

02/27/2015 06:31:07.41 <Erro:DM.Error> Slot-1: Process mpls Failed
02/27/2015 06:31:07.37 <Erro:EPM.proc_conn_lost> Slot-1: Connection lost with process mpls
02/27/2015 06:31:05.91 <Crit:Kern.Card.Alert> Slot-1:   865c40  8c840034 lw     a0,52(a0)
02/27/2015 06:31:05.91 <Crit:Kern.Card.Alert> Slot-1:   865c3c  ac430000 sw     v1,0(v0)
02/27/2015 06:31:05.91 <Crit:Kern.Card.Alert> Slot-1:   865c38  00000000 nop
02/27/2015 06:31:05.91 <Crit:Kern.Card.Alert> Slot-1:   865c34  8c830038 lw     v1,56(a0)
02/27/2015 06:31:05.91 <Crit:Kern.Card.Alert> Slot-1:   865c30  8c82003c lw     v0,60(a0)
02/27/2015 06:31:05.91 <Crit:Kern.Card.Alert> Slot-1:   865c2c <ac430004>sw     v1,4(v0)
02/27/2015 06:31:05.91 <Crit:Kern.Card.Alert> Slot-1:   865c28  00808021 addu   s0,a0,zero
02/27/2015 06:31:05.91 <Crit:Kern.Card.Alert> Slot-1:   865c24  8c83003c lw     v1,60(a0)
02/27/2015 06:31:05.91 <Crit:Kern.Card.Alert> Slot-1:   865c20  8c820038 lw     v0,56(a0)
02/27/2015 06:31:05.12 <Crit:Kern.Card.Alert> Slot-1: Code:
02/27/2015 06:31:05.12 <Crit:Kern.Card.Alert> Slot-1: 
02/27/2015 06:31:05.12 <Crit:Kern.Card.Alert> Slot-1: Process mpls pid 1847 died with signal 11
02/26/2015 13:47:25.53 <Erro:Kern.Card.Error> Slot-2:
 
  • It is confirmed that the crash happens due to the software bug.
  • CR xos0060485 -mpls process crashed with signal 11 while changing LSR id

  
Resolution
  • The CR (xos0060485) will be fixed in the following releases.
  •  EXOS 16.1.2 
  •  EXOS 22.2.1 
  •  EXOS 21.1.3 
Additional notes

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