ORA--07445 error during online Re-org process in 10.2.0.4 database
Bug 6494048 - Dump [ktsk_get_prevl2] from ALTER INDEX .. SHRINK SPACE (Doc ID 6494048.8)

This issue is fixed in

11.2.0.1 (Base Release)
10.2.0.5 (Server Patch Set)


Upgrade from that ancient, unsupported version.