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Memory Leak Triggers Task Suspension and/or Exceptions Leading To Reset of Switch

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TitleMemory Leak Triggers Task Suspension and/or Exceptions Leading To Reset of Switch
Symptoms
  • Event log shows various tasks become suspended and/or log exception as a result of memory leak
  • Affected tasks can vary depending on which task(s) running at time
C 2019-04-26 21:43:16 GMT+01:00 3 NVR Sw Exception: Task tIdt, Type Data Access, PC 0x00f5954c, SP 0x04802d60 
C 2019-04-26 21:48:14 GMT+01:00 4 NVR Sw Exception: Task tIdt, Type Data Access, PC 0x00f5954c, SP 0x04802d60 
C 2019-04-26 21:58:15 GMT+01:00 5 NVR Sw Exception: Task tIdt, Type Data Access, PC 0x00f59360, SP 0x04802d50 
C 2019-04-26 22:08:17 GMT+01:00 6 NVR Sw Exception: Task tIdt, Type Data Access, PC 0x00f59360, SP 0x04802d50 
C 2019-04-26 22:13:22 GMT+01:00 7 NVR Sw Exception: Task tIdt, Type Data Access, PC 0x00f5954c, SP 0x04802d80 
C 2019-04-26 22:23:34 GMT+01:00 8 NVR Sw Exception: Task tSTP, Type Data Access, PC 0x00f59360, SP 0x063ea9a0 
C 2019-04-26 22:43:16 GMT+01:00 9 NVR Sw Exception: Task tIdt, Type Data Access, PC 0x00f5954c, SP 0x04802d60 
C 2019-04-26 23:08:14 GMT+01:00 10 NVR Sw Exception: Task tIdt, Type Data Access, PC 0x00f5954c, SP 0x04802d60 
C 2019-04-26 23:13:17 GMT+01:00 11 NVR Sw Exception: Task tIdt, Type Data Access, PC 0x00f59360, SP 0x04802d50 
C 2019-04-26 23:18:15 GMT+01:00 12 NVR Sw Exception: Task tIdt, Type Data Access, PC 0x00f59360, SP 0x04802d50 
C 2019-04-26 23:23:16 GMT+01:00 13 NVR Sw Exception: Task tIdt, Type Data Access, PC 0x00f5954c, SP 0x04802d60 
C 2019-04-26 23:28:24 GMT+01:00 14 NVR Sw Exception: Task tVLACP, Type Data Access, PC 0x00f59360, SP 0x06799c30 
C 2019-04-26 23:38:16 GMT+01:00 15 NVR Sw Exception: Task tIdt, Type Data Access, PC 0x00f5954c, SP 0x04802d60 
C 2019-04-27 00:03:16 GMT+01:00 16 NVR Sw Exception: Task tIdt, Type Data Access, PC 0x00f5954c, SP 0x04802d60 
C 2019-04-28 00:23:14 GMT+01:00 17 NVR Sw Exception: Task tIdt, Type Data Access, PC 0x00f59360, SP 0x04802d50 
C 2019-04-28 15:08:22 GMT+01:00 18 NVR Sw Exception: Task tVLACP, Type Data Access, PC 0x00f59360, SP 0x06799b40 
C 2019-04-28 15:13:15 GMT+01:00 19 NVR Sw Exception: Task tIdt, Type Data Access, PC 0x00f59360, SP 0x04802d50 
C 2019-04-28 15:38:15 GMT+01:00 20 NVR Task tARPINSP is suspended 
C 2019-04-28 15:43:55 GMT+01:00 21 NVR Memory on unit 1 is under 5 MBytes. 
C 2019-04-28 15:44:42 GMT+01:00 22 NVR Memory on unit 1 is under 4 MBytes. 
C 2019-04-28 15:45:31 GMT+01:00 23 NVR Memory on unit 1 is under 3 MBytes. 
C 2019-04-28 15:50:20 GMT+01:00 24 NVR Sw Exception: Task tVLACP, Type Data Access, PC 0x00ec9114, SP 0x06799e10 
C 2019-04-28 16:22:15 GMT+01:00 25 NVR Sw Exception: Task tIdt, Type Data Access, PC 0x00f59360, SP 0x04802d50 
C 2019-04-28 17:02:16 GMT+01:00 26 NVR Task tARPINSP is suspended
Environment
  • ERS 4500
  • Release 5.7.3
Cause
  • Memory leak correlated to new VLAN added to network
  • New VLAN traffic consists of ICMP and ARP traffic
Resolution
  • Re-mediate new VLAN network traffic
  • Software fix not possible due to switch model beyond software support
Additional notes
For more information on lifecycle support for ERS 4500 switches, please see:

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