No line number information available

[Brian Kuschak]

I'm debugging a linux kernel module.  The code is
compiled with -g, and I loaded the symbol file into
gdb:

add symbol table from file "fs/fat/fat.o" at
	.text_addr = 0xcdae1060
	.rodata_addr = 0xcdea7530
	.data_addr = 0xcdae81e8
	.sdata_addr = 0xcdae8420
	.sbss_addr = 0xcdae842c
	.bss_addr = 0xcdae8430

GDB doesn't find line numbers for the code.  However
'objdump -S fs/fat/fat.o' shows line numbers just
fine.  Why doesn't GDB find them?  

(gdb) list fat_scan
No line number information available for address
0xcdae70f0 <fat_scan>

Strangely, (since fat.o is composed of multiple source
files), GDB does find line numbers for some of those
files:
(gdb) list fat_fs_panic
Line 45 of "misc.c" starts at address 0xcdae61a8
<fat_fs_panic+24> and ends at 0xcdae61ac
<fat_fs_panic+28>.

What is wrong here?  I tried -g, -gstabs, -gdwarf.

-Brian


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