Unloading a module and loading it again.
kgdb versions 1.9 and above are capable of detecting loading and
unloading of modules. You can load and unload modules as and when
needed. gdb will automatically load and unload object files
corresponding to them. For kgdb versions 1.8 and earlier you have to
use following procedure.
Unloading a module and loading it again in kgdb
1.8 and earlier.
A module can be unloaded as usual using rmmod command. You can
again load it using loadmodule.sh script. After this you
cannot immediately source the gdb script generated by loadmodule.sh
script. This is because gdb will already have all the symbols loaded.
You'll need to remove all of the symbol table from gdb and then start
You can use the symbol-file command of gdb. symbol-file
command removes existing symbol table and loads a new one. symbol-file
vmlinux will load all vmlinux symbols from scratch. After this you
can load module object files as per the usual procedure.
I have found that above procedure sometimes doesn't work correctly. A
better way is to quit from gdb and start afresh. Please refer to using gdb for kernel debugging page for
details. You'll need to remember that breakpoints placed by previous
gdb will be absent when you load new gdb.