OpenBSD's built-in memory leak detection

As announced on the misc@ mailing list, Otto Moerbeek (otto@), the author of OpenBSD's malloc(3) implementation [a.k.a. "otto malloc"], has written a tutorial on the new malloc(3) leak detection available in OpenBSD 7.4

Read it at: OpenBSD's built-in memory leak detection

Since the publication of that write-up, Otto has committed further enhancements:

CVSROOT:	/cvs
Module name:	src
Changes by:	otto@cvs.openbsd.org	2023/10/22 06:19:26

Modified files:
	lib/libc/stdlib: malloc.3 malloc.c 

Log message:
When option D is active, store callers for all chunks; this avoids
the 0x0 call sites for leak reports. Also display more info on
detected write of free chunks: print the info about where the chunk
was allocated, and for the preceding chunk as well.
ok asou@