[lug] System.map

[Rob Riggs]

"Howell, Jeff S" wrote:
> 
> So how does one fix this?

Ah, right. A new System.map is generated in the top-level of the
kernel source tree every time a new kernel is made. This should
be copied into the /boot directory.

I always copy my System.map to a version specific file-name and
make a symlink. Currently my /boot/System.map looks like this:

lrwxrwxrwx   1 root     root           35 Oct 16 17:38 System.map -> ./System.map-2.2.13pre17+raid+ipsec

> -----Original Message-----
> From: Rob Riggs [mailto:rob at pangalactic.org]
> Sent: Monday, November 08, 1999 3:09 PM
> To: lug at lug.boulder.co.us
> Subject: Re: [lug] System.map
> 
> "Stephen G. Smith" wrote:
> >
> > Will someone explain sysmap.map?
> > What does it do?
> >
> > On a new kernel install, is a new one generated?
> >
> > I have a new kernel installed now and I get a message that
> > the System.map lists the wrong kernel version..
> 
> The System.map file lists the addresses of kernel functions and
> static data areas, so that programs like 'ps' can determine what
> kenrel function a process may be sleeping in. If run 'ps -aelf',
> for instance, it lists a WCHAN column with a function name. This
> is the function that the process is sleeping in.
> 
> The System.map is also used to decode the traceback that the kernel
> emits when the kernel has an exception (or "kernel oops"). The newer
> syslogd can do this, provided a System.map is installed.
> 
> Having a System.map installed that does not coorespond to your
> running kernel can cause all sorts of confusion when trying to
> track down obscure system problems.

-- 
Rob Riggs
Technical Staff
Tummy.com, Ltd.
http://www.tummy.com/