kgdb break point problem on 2.6.28.2

[Kallol Biswas]

Hi,
   I have setup kgdb over serial port and installed a few kernel modules.
The module symbol has been added with the command:

add-symbol-file  <module.ko file> <start adddress from /proc/modules>
(gdb) add-symbol-file /data/cxgb3toe-1.2/src/cxgb3/cxgb3.ko 0xf83dc000
add symbol table from file "/data/cxgb3toe-1.2/src/cxgb3/cxgb3.ko" at
	.text_addr = 0xf83dc000
(gdb) rb cxgb3_.*
Breakpoint 1 at 0xf83e1573: file
/data/cxgb3toe-1.2/src/cxgb3/cxgb3_main.c, line 897.
int cxgb3_filter_toe_mode(struct adapter *, int);
Breakpoint 2 at 0x24: file /data/cxgb3toe-1.2/src/cxgb3/cxgb3_main.c, line 4778.
static void cxgb3_cleanup_module(void);
Breakpoint 3 at 0x1c70: file
/data/cxgb3toe-1.2/src/cxgb3/cxgb3_main.c, line 4752.

It seems that all the symbols are visible, can list and put break
points in functions.

However, if I hit continue, and when execution hits breakpoints
following messages
are displayed:

(gdb) c
Warning:
Cannot insert breakpoint 2.
Error accessing memory address 0x24: Unknown error 18446744073709551615.
Cannot insert breakpoint 3.
Error accessing memory address 0x1c70: Unknown error 18446744073709551615.
Cannot insert breakpoint 5.
Error accessing memory address 0xdb0: Unknown error 18446744073709551615.
Cannot insert breakpoint 6.
Error accessing memory address 0x2095: Unknown error 18446744073709551615.
Cannot insert breakpoint 15.
Error accessing memory address 0x5a: Unknown error 18446744073709551615.
Cannot insert breakpoint 16.
Error accessing memory address 0x1cd2: Unknown error 18446744073709551615.


The ddd version is 3.3.10 and gdb version is 6.8.

Any idea what mistake I have made?
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