This is a port of the Solaris Modular Debugger to FreeBSD.  Currently it
only supports debugging of FreeBSD/amd64 kernels via kernel crashes
(vmcores) or live systems via /dev/mem.  It does not include a port of the
in-kernel kmdb debugger.

WWW: https://docs.oracle.com/cd/E19683-01/806-6545/index.html