I have kgdb setup using two virtual machines, both are having CentOs 6.4(actually kgdb host is clone of target). I am successfully able to connect to remote target and start debugging. I want to debug RAID driver, specifically raid456.ko. My problem is I am able to set breakpoint on few functions after loading symbols of this raid456.ko using add-symbol-file command under gdb, but I am not able to set breakpoint on few functions. For example, I can set breakpoint on ops_run_biofill function but not on ops_run_biodrain function. Both are static functions and part of raid5.c file. If I try to set breakpoint on ops_run_biodrain then it shows:
(gdb) b ops_run_biodrain
Function "ops_run_biodrain" not defined. Make breakpoint pending on future shared library load? (y or [n])
Why few function can be debugged and why some others not?
[EDIT]--------------------- I further investigated the issue and I found that using nm utility we can find name and virtual address of any symbol part of some particular object file. I tried nm on raid456.ko and found that ops_run_biofill function is in output of nm command, but ops_run_biodrain is not in the output. Does this mean ops_run_biodrain is not in raid456.ko? If yes then why it is not part of raid456.ko? ops_run_biodrain is not under any macro check.
