Hi, After setting up the testbed, to remotely (serially) debug the kernel and then applying the breakpoints, kernel execution does not stop at the breatpoint. Below are the steps : I compiled the kernel 2.6.8 after applying the kgdb patch and made a set up to remotely debug the kernel mdule. I used gdbmod (available at http://kgdb.linsyssoft.com) on development machine to connect to the target machine as shown below. /*********************************************************************/ [root@vishalsoni linux-2.6.8]# gdbmod vmlinux GNU gdb 6.0 Copyright 2003 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 "i686-pc-linux-gnu"... (gdb) target remote /dev/ttyS0 Remote debugging using /dev/ttyS0 breakpoint () at kernel/kgdb.c:1212 1212 atomic_set(&kgdb_setting_breakpoint, 0); (gdb) /*********************************************************************/ To let GDB know where module files are located, i set GDB variable solib-search-path /*********************************************************************/ (gdb) set solib-search-path /home/vishal/products/tot_driver/ /*********************************************************************/ and then i did insmod on target to load the kernel module and checked the output of /proc/modules /*********************************************************************/ [root@localhost mon_drv]# insmod ./tot.ko [root@localhost mon_drv]# cat /proc/modules tot 17428 0 - Live 0xe028e000 nfsd 194976 9 - Live 0xe0219000 <snip> /*********************************************************************/ #### my module name is "tot" I Cross-checked if the symbols are loaded in gdb on development machine /*********************************************************************/ (gdb) info sharedlibrary >From To Syms Read Shared Object Library 0xe028e000 0xe028fd6c Yes /home/vishal/products/tot_driver/tot.ko No nfsd.ko No exportfs.ko No lockd.ko No md5.ko No ata_piix.ko No libata.ko No sd_mod.ko No scsi_mod.ko (gdb) /*********************************************************************/ this clearly shows that the symbol information is available to gdb and i was successfully able to put a breakpoint too (gdb) break f_mmap Breakpoint 1 at 0xe028ec60: file /home/vishal/products/tot_driver/tot..c, line 108. Now, the issue is that the execution of the kernel does not stop when this function is being called. I am sure that this function is being used as i have some printks in the function and their output is shown in dmesg. Is there any think which i am missing. Your inputs on this would be highly appreciated. regards, Vishal. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
