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Cisco Bug: CSCsg39111 - malloc failure for CT3 for larger packet sizes on NPE-G2

Last Modified

Feb 07, 2017

Products (1)

  • Cisco 7200 Series Routers

Known Affected Releases

12.2(31.4.64)SB 12.2(32.8.86)SR 12.2(32.8.91)SR 12.2SRC

Description (partial)

Symptom:

Malloc failures will be noticed during operation of the router.

23:58:26: %SYS-2-MALLOCFAIL: Memory allocation of 65556 bytes failed from 
0x9B296C, alignment 64 
Pool: I/O  Free: 58496  Cause: Not enough free memory 
Alternate Pool: None  Free: 0  Cause: No Alternate pool 

also you can find the fallback counters incrementing for the incoming 
interface thro sh tech/sh buffers...

GigabitEthernet0/3 buffers, 512 bytes (total 1000, permanent 1000):
     0 in free list (0 min, 1000 max allowed)
     1000 hits, 325295516 fallbacks <==
     1000 max cache size, 0 in cache
     167843697 hits in cache, 325295516 misses in cache
     14 buffer threshold, 21502 threshold transitions

Conditions:

This will happen when the incoming interface is faster than the outgoing 
interface [for e.g. incoming GIGE and Tx as CT3 in this case] and the TX 
interface has a holdq config in it with multiple sub interfaces.
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