Re: [Vserver] netstat -nap --inet kills vserver kernel

[James MacLean]

Herbert Poetzl wrote:
On Thu, Sep 16, 2004 at 10:24:31AM -0300, James MacLean wrote:
 

Herbert Poetzl wrote:
   

On Wed, Sep 15, 2004 at 09:53:50PM -0300, James MacLean wrote:
     

Herbert Poetzl wrote:
       

On Wed, Sep 15, 2004 at 08:28:43PM -0300, James MacLean wrote:
         

Herbert Poetzl wrote:
           

Don't hold your breath :(. Can not find a null modem and cables :(. 
Plus the test box is down and didn't auto reboot this time so I'm 
sending someone in to revive it :).
                   

I can wait ;) ...
best,
Herbert
             

JES
           

Hi James!
okay, could you put the EIP address through addr2line
with 'addr2line -e vmlinux c02ae990' and see if
this points to the folowing line of code:
         

Just gives ??:00
       

probably CONFIG_DEBUG_KERNEL=y isn't set in the 
kernel config. make a copy of the kernel source
tree, change just that single option, recompile
the kernel and use the vmlinux for the addr2line

     

Needed CONFIG_DEBUG_INFO=y.
   

net/ipv4/tcp_ipv4.c ~2189
                vxdprintk(VXD_CBIT(net, 6),
                        "sk,req: %p [#%d] (from %d)",
                        req->sk, req->sk->sk_xid, current->xid);
here ----->  if (!vx_check(req->sk->sk_xid, VX_IDENT|VX_WATCH))
                        continue;
                if (req->class->family == st->family) {
                        cur = req;
                        goto out;
                }
if the addr2line doesn't produce a line in
net/ipv4/tcp_ipv4.c, please decrement the addr
in steps of 4 bytes, like this: 
c02ae98c, c02ae988, c02ae984, c02ae980 ...
and see where in net/ipv4/tcp_ipv4.c it ends up

         

Sorry, but all I get it is ??:00 and after reading the man on addr2line, 
I also compiled hello.c and got the same result. So obviously I'm not up 
to snuff with what I should be doing/seeing to get addr2line to 
function.  Or is there a way to get what you want with "gdb vmlinux" ?
       

(for hello.c you'll need the -g option for gcc)
     

Okay. This time the EIP resulted in :
addr2line -e /usr/src/linux/vmlinux c02ae98c
include/linux/vs_base.h:23
   

okay could you please go back in steps of 4 bytes as
described above .. c02ae988, c02ae984, c02ae980 ...
until you hit 'something' in net/ipv4/tcp_ipv4.c?
 

addr2line -e /usr/src/linux/vmlinux c02ae988
net/ipv4/tcp_ipv4.c:2185
JES
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