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KGDB(7) Miscellaneous Information Manual KGDB(7)

remote kernel debugging with gdb

Should a programmer be dissatisfied with the OpenBSD kernel's internal debugger ddb(4), and have appropriate hardware available, a kernel with option KGDB may be built to effect remote debugging with gdb(1) instead.
To prepare for debugging over serial line one would:

gdb(1), ddb(4), options(4)
gdb info documents and online documentation.

The remote connection will introduce certain latencies a local debugger would not see.
Not available on all architectures.
May 31, 2007 OpenBSD-6.1