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|Affected Product ID
||SUP crash after running data and pcmm traffic.|
The Supervisor (SUP) card might reload due to a memory corruption.
In a SUP card, certain data structures and classes are used for process execution. When a certain class target (downstream dynamic flow) is no longer used, the target class list is not erased properly. This leads to a corruption in the list queue.
This issue can occur under these conditions:
- Deletion or reset of all cable modems with the same configuration file (and thus, class parameters)
- Shutdown of bundle, Integrated-Cable/Wideband interfaces, or MAC domain
- Reset or removal of cBR8 line card
The core dump due to this issue can be diagnosed with the GDB (GNU Debugger).
The crash or traceback decode points to a list operation failure due to memory corruption. Cisco Technical Support can decode the IOSD core in order to confirm that this is the root cause.
Check the core file/crashinfo when the SUP protect card is back up and look for Linux-iosd core. An example is shown here:
tb34-cBR8# dir stby-harddisk:core/
Directory of dir stby-harddisk:core/
37 -rw- 1076440910 Oct 25 2016 22:40:03 -04:00 ORLD09-CTS2_RP_1_linux_iosd-imag_16167_1484784055.core.gz
7800705024 bytes total (3328479232 bytes free)
Cisco highly recommends that customers upgrade to a corresponding release that has the fix as listed in the table in this section.
In the interim, and in order to avoid the SUP issue, it is suggested to not perform any of the three conditions listed in the Background section. If a SUP crash occurs, it is suggested to reload the standby SUP as well.
The show version CLI command displays the current software version that runs on the cBR8 router. See this example:
Refer to Upgrading the Cisco cBR-8 Router Firmware for instructions on how to upgrade the cBR-8 Cisco IOS XE Release.
How To Identify Affected Products
The hardware information can be determined as indicated in this picture:
For More Information
If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:
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