Root cause is buffer sharing in SUMA.
Required conditions are : Online reorg, ndbmtd, SUMA events (Binlogging MySQLD)
Symptoms could include crashes in TRIX, LQH, or silent data corruption

Fixes include :
  1.  Improve SUMA buffer sharing detection
  2.  Avoid sharing buffers for reorg

Testing improvements :
  3.  New testcase ndb_addnode_withbinlog, which also attempts to 
have multi-LDM + 'Mixology' setting for signal mixing
  4.  New 'Mixology' setting to increase signal interleaving and 
find more bugs.

Related bug still currently open :

b u g # 19912988 NDB : ONLINE REORG RELATED ROW CHANGES ARE BINLOGGED