Data Domain: Netmon process repeatedly crashing in DDOS 6.0

Environment:

Data Domain

 

Description:

This article describes an issue with Data Domain Network Monitoring daemon (netmon) which may repeatedly crash in DDOS 6.0 with the following PANIC strings:

Nov 29 13:08:00 occ01ss014 netmon: ERROR: MSG-INTRNL-00001: PANIC: lib/dd_memstats.c: dd_malloc_verify_fence: 502: !(footer->header == header)

Nov 29 13:08:04 occ01ss014 netmon: ERROR: MSG-INTRNL-00001: PANIC: lib/dd_memstats.c: dd_malloc_verify_fence: 501: !(footer->magic == MALLOC_TAIL_MAGIC)

 

 

Resolution:

Currently this issue is being investigated as potential product fixes, in the meantime, customers can perform a workaround, which consists of disabling the support for LLDP in the "netmon" process, which being just an add-on for monitoring the network, doesn't affect backups and related workloads (restores, replication, etc.) at all.

 

To apply the workaround, start by logging in the DD through the CLI as "sysadmin" or equivalent user, and turn to SE mode by running: #### Get the DD serial number to use later as the SE password

# system show serialno

 

#### Turn to SE privilege mode by running the command below and using the DD serial number obtained above as the password

# priv set se

 

For a detailed step by step resolution please refer to EMC Support Solution 492781 https://support.emc.com/kb/492781



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