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Cisco Bug: CSCsz05181 - stack corruption crash with BFD configured

Last Modified

Apr 04, 2018

Products (1)

  • Cisco IOS

Known Affected Releases

12.2(32.8.11)SR186 12.2(33)SRC3 12.2(33)SRC4 12.4(24.6)T5

Description (partial)

Symptoms: A router may reload unexpectedly.
 Conditions: The symptom is observed when the router has Bidirectional
 Forwarding Detection (BFD) configured and is actively sending keepalives. The
 crash has multiple possible triggers:
 - It can be triggered by certain show commands (<CmdBold>show
 bootvar<noCmdBold> and <CmdBold>show c7200<noCmdBold> are known to cause the
 problem). The issue will not be seen on every invocation of the commands. It
 is a rare timing condition, so the probability of the crash increases as the
 commands are run more frequently.
  - It can also be triggered by large scale BFD deployments (hundreds of sessions
 on a single router).
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