The operating system kernel will implicitly stop executing and enter kmdb when a breakpoint is reached or according to the other execution control settings described in Chapter 6, Execution Control. You can use the mdb –K option or an appropriate keyboard break sequence to request explicit entry to kmdb. On a SPARC system console, use the STOP-A key sequence to send a break and enter kmdb. On an x86 system console, use the F1–A key sequence to send a break and enter kmdb. You can use the kbd command to customize the escape sequence on your Oracle Solaris system. To enter kmdb on a system with a serial console, use the appropriate serial console command to send a break sequence.