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A Catalyst 6500 or 7600 switch with Sup720 that runs native Cisco IOS can reload with a breakpoint exception (signal=5)

Core issue

The breakpoint means an attempt to execute BREAK instruction.

This problem is caused when an internal 32 bit counter overflows and wraps around to 0. This counter is not related to user traffic. Typically, this counter reaches the maximum and wraps around in approximately 40 to 50 weeks of continuous uptime.

This is seen only in switches that run these Cisco IOS  software releases:

  • Cisco IOS Software Release 12.2(17d)SXB1

  • Cisco IOS Software Release 12.2(18)SXD

  • Cisco IOS Software Release 12.2(18)SXE

  • Cisco IOS Software Release 12.2(18)SXF

This issue is documented in Cisco bug ID CSCsb98702.

Resolution

Issue the remote command switch test ltl profile stop command in order to enable mode command to disable ltl profiling. This command needs to be issued after each reload. This command also needs to run on the new active after switchover. This command has no side effect on the system.

In order to confirm that the workaround is in place, issue the remote command switch test ltl profile show enable mode command.

The ltl profile status must be Off in order to verify that the workaround was applied successfully.

This bug is fixed in these Cisco IOS software releases:

  • Cisco IOS Software Release 12.2(18.09.24)SX

  • Cisco IOS Software Release 12.2(18.09.20)SX3.30

  • Cisco IOS Software Release 12.2(29.06.21)SR

  • Cisco IOS Software Release 12.2(18)SXD07

  • Cisco IOS Software Release 12.2(18)SXF01

  • Cisco IOS Software Release 12.2(18)SXE05

  • Cisco IOS Software Release 12.2(17d)SXB11a

These software releases can be downloaded at Cisco Downloads.

Error message

Breakpoint exception (signal=5)

Version history
Revision #:
1 of 1
Last update:
‎06-22-2009 04:14 PM
Updated by:
 
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