Symptom:
Nexus 9000 may crash unexpectedly.

Conditions:
The crash is generally triggered from disabling and then enabling individual 'logging onboard' logs.  Module 2 is referenced, but there is no Module 2 in the system.  For example:

n9k(config)# hw-module logging onboard interrupt-stats 
    Module:  1   Enabling interrupt-stats ... was successful.
Failed to send OBFL command to OBFL daemon: 110 (Connection timed out)
    Module:  2   Enabling interrupt-stats ... has failed.

n9k(config)# hw-module logging onboard counter-stats 
    Module:  1   Enabling counter-stats ... was successful.
Failed to send OBFL command to OBFL daemon: 110 (Connection timed out)
    Module:  2   Enabling counter-stats ... has failed.