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Cisco Bug: CSCun88463 - Router reload due to memory corruption with IP SLA

Last Modified

Nov 27, 2020

Products (84)

  • Cisco 3900 Series Integrated Services Routers
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco C892FSP Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco C897VA Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
  • Cisco 892W Integrated Services Router
  • Cisco 888W Integrated Services Router
  • Cisco 2951 Integrated Services Router
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Known Affected Releases

15.2(4)M3.11 15.4(1)T1 15.4(2)T1

Description (partial)

A router may reload unexpectedly. Chunk corruption error messages may be observed, similar to the following:

Mar 23 17:58:00.183: %SYS-2-CHUNKBADMAGIC: Bad magic number in chunk header, chunk 25946BCC  data 26F39424  chunkmagic 0  chunk_freemagic EF4321CD -Process= "Exec", ipl= 0, pid= 3
-Traceback= 1AD57A1z 3242562z 3242317z 324116Bz 32334EAz 3236097z 692AF39z 19FE57Dz 1A22D87z 1A224FFz 1A2062Az 1A37585z
chunk_diagnose, code = 1
chunk name is MallocLite

current chunk header = 0x26F39414
data check, ptr = 0x26F39424

next chunk header = 0x26F3943C
data check, ptr = 0x26F3944C

previous chunk header = 0x26F393EC
data check, ptr = 0x26F393FC


This has been observed on the ISR 3900E, running 15.2(4)M4, 15.4(1)T, 15.4(2)T. It likely affects all other releases.

The crash requires inter-device redundancy to be configured - a common example of this would be CUBE HA. No application needs to be configured for HA - the crash will occur with only base redundancy configured.

Once redundancy is configured, enabling IP SLA probes on the standby router will cause it to crash. The active router has NOT been observed to crash.
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