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 Solaris system. To enter kmdb on a system with a serial console, use the appropriate serial console command to send a break sequence.