An average of 12KB of memory leak happening for each search query. The memory consumption of db2fmp/db2syscs process will be increased for each search query until the machine runs out of memory. This will lead to system hang/instance shutdown. This issue was fixed in V9.7 FP4.
This has been identified as a product defect under APAR IC74242. APAR description and location of fix packs are in the link below