PR: 191174 Submitted by: Franco Fichtner <franco at lastsummer.de>
PR: 130324 Submitted by: Jaakko Heinonen <jh@saunalahti.fi> MFC after: 3 days
It detects both: buffer underflows and buffer overflows bugs at runtime (on free(9) and realloc(9)) and prints backtraces from where memory was allocated and from where it was freed. Tested by: kris