Re: [uml-devel] Kernel mode fault at addr 0x48965000, ip0x400e51a4

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

Alle 21:33, sabato 10 gennaio 2004, Johannes Formann ha scritto:
> At 20:25 Uhr +0100 07.01.2004, BlaisorBlade wrote:
> >The fix maybe is not perfect but something must go in. Also, if that
> > doesn't work, maybe the error is somewhere else (and triggered by this
> > change, as easily happens).
>
> Has anyone found an workaround to get modules working with 23-1?

Why do you say "modules"? I.e. do you get that problem in a special situation, 
like Jeff Chua that sees it only when he uses LVM? Does your UML uses an 
initrd to load some modules?

> For the Simpel Patch doesn't work, and I think Jeff has change a few
> things more in mem.c between 22-5 and 23-1.

Jeff Chua posted 2 patches. The second was shorter BUT I'm *at all* sure it 
cannot do anything (by having read and understood it). I think you should 
apply his first change, or, as a workaround, disable klogd from inside UML or 
remove /dev/kmem. Your guest will work anyway (and inserting the proper fix 
will require more time). Also, on my systems, inside UML, klogd doesn't use 
/dev/kmem.

--- linux/drivers/char/mem.c    Wed Jan  7 02:58:37 2004
+++ uml/drivers/char/mem.c      Wed Jan  7 03:07:52 2004
@@ -210,3 +210,2 @@
        char * kbuf; /* k-addr because vread() takes vmlist_lock rwlock */

-       p = (unsigned long) __va(p);
        if (p < (unsigned long) high_memory) {
@@ -269,3 +269,3 @@
        }
-       *ppos = __pa((void *) p);
+       *ppos = p;
        return virtr + read;

Also, I've posted below (in this thread) a message which explains what is the 
bug (search for "[tracked down]" in the subject). So the debug work should be 
complete. The problem is that properly fixing it is maybe hard.

-- 
cat <<EOSIGN
Paolo Giarrusso, aka Blaisorblade
Linux Kernel 2.4.23/2.6.0 on an i686; Linux registered user n. 292729
EOSIGN



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