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Cisco Bug: CSCtb37662 - Deferencing a null ptr in syncNlmLogTableVarbind_callback leads to crash

Last Modified

Apr 09, 2018

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)


An alignment error may occur on a  Cisco router or switch because the device tries to write to an invalid address in memory and this causes a crash.

An ALIGN-1-FATAL error message should be logged if the problem is seen.

%ALIGN-1-FATAL: Illegal access to a low address 00:10:55 MDT Wed Jul 22 2009 addr=0x18, pc=0x411E7608, ra=0x411E75B0, sp=0x48D75F60 


The crash is seen when the router becomes low on memory and  snmp mib notification-log default  is enabled on the router.

.Aug  9 09:14:05.643 MDT: STDBY: Very low memory, dump debuginfo, local 21788, io 53502624
.Aug  9 09:15:23.784 MDT: %SYS-STDBY-2-MALLOCFAIL: Memory allocation of 804 bytes failed from 0x413D42C0, alignment 0 
Pool: Processor  Free: 1468  Cause: Memory fragmentation 
Alternate Pool: None  Free: 0  Cause: No Alternate pool
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