debug1            655 kern/kern_sysctl.c extern struct ctldebug debug0, debug1;
debug1            661 kern/kern_sysctl.c 	&debug0, &debug1, &debug2, &debug3, &debug4,
debug1            788 kern/vfs_subr.c struct ctldebug debug1 = { "busyprt", &busyprt };
debug1            656 sys/sysctl.h   extern struct ctldebug debug0, debug1, debug2, debug3, debug4;