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Cisco Bug: CSCuj09602 - C3900e crashed at "ddns_destroy_io_process"

Last Modified

Jun 13, 2019

Products (1)

  • Cisco IOS

Known Affected Releases

15.4(0.19)T

Description (partial)

Symptom:
IOS router may crash unexpectedly due to memory corruption in the DHCPD Dynamic Update process.

Conditions:
Dynamic DNS must be configured on the router.

The crash occurs due to a timing issue. The DHCPD Dynamic Update process queues dynamic DHCP bindings for processing; however, if a binding is being destroyed, there is still a chance (under certain timing conditions) that it may be queued for DDNS processing.
The crash will occur when the already-freed binding is accessed during DDNS processing.
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