Symptom
l2vpn_mgr may crash if the STP library debug is enabled. (i.e. debug spanning-tree library).
NB: this may be seen in some error cases even if MSTP is not configured.
Conditions
The crash will only be seen if the spanning-tree debug is enabled.
Workaround
Don't enable debug for the spanning tree library.
Further Problem Description
This issue occurs due to incorrect handling of 64-bit pointers in the stp debug code.
