3750x Stack UTIL-3-TREE: Data structure error--attempt to remove an unthreaded node from a tree

[an.alexander]

A Cisco Stack 3750X switch report the following error message:
%UTIL-3-TREE: Data structure error--attempt to remove an unthreaded node from a tree.

every minute +-20 sec

Cisco IOS Software, C3750E Software (C3750E-IPBASEK9-M), Version 15.0(2)SE4, RELEASE SOFTWARE (fc1)

analog bug: https://tools.cisco.com/bugsearch/bug/CSCsz93221

[Nick Gilbert]

WS-C3750G-24PS-E C3750-IPBASEK9-M version 12.2(53)SE2

After implementing 802.1x with Avaya IP phones

%UTIL-3-TREE: Data structure error--attempt to remove an unthreaded node from a tree

Port then fails authentication and goes into vl-err-dis