When I'm debugging linux kernel, the breakpoint does not get hit as expected. The following is the message in the console: [root@Qroute linux-2.4.10]# gdb vmlinux GNU gdb Red Hat Linux (5.2-2) Copyright 2002 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i386-redhat-linux"... (gdb) target remote /dev/ttyS0 Remote debugging using /dev/ttyS0 handle_exception (exceptionVector=Cannot access memory at address 0xe08 ) at gdbstub.c:856 856 remcomOutBuffer[0] = 0; warning: shared library handler failed to enable breakpoint (gdb) c Continuing... Does anyone know how to solve it? regards. pengbin -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/