[Qemu-devel] setting up breakpoints - kernel debugging help wit gdb in qemu-kvm

[Onkar]

I am running a linux guest like this - which I wish to debug - 
but the breakpoint gets set but I am not able to stop the guest 
execution at the set breakpoint - it just hangs after I do continue. 
Can you please provide me some clues - 

# ./qemu-system-x86_64 -m 2048 -smp 4 -vga std -vnc :5 -drive
file=/sda4/bin/disk/disk0.img,cache=writeback -S -s

# gdb
GNU gdb (GDB) Fedora (7.2-52.fc14)
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show
copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
The target architecture is assumed to be i386:x86-64:intel
(gdb) symbol-file /sda4/kvm/vmlinux
Reading symbols from /sda4/kvm/vmlinux...done.
(gdb) target remote :1234
Remote debugging using :1234
0x0000000000000000 in ?? ()
(gdb) b kmem_cache_alloc
Breakpoint 1 at 0xffffffff81121adb: file mm/slub.c, line 2375. (2
locations)
(gdb) c
Continuing.


Thanks, 
Onkar