Re: [uml-devel] Kernel mode fault at addr 0x48965000, ip 0x400e51a4 (fwd)

Re: [uml-devel] Kernel mode fault at addr 0x48965000, ip 0x400e51a4 (fwd)

[Jeff Chua]

running with "strace -f klogd" ...

munmap(0x4013b000, 4096)                = 0
get_kernel_syms(0)                      = 956
brk(0x80a9000)                          = 0x80a9000
get_kernel_syms(0x8092118)              = 956
open("/dev/kmem", O_RDONLY)             = 3
_llseek(0x3, 0, 0xa8965000, 0xbffff934, 0) = 0
read(3, Kernel panic: Kernel mode fault at addr 0x48965000, ip 0x400df1a4


It seems to break while reading /dev/kmem

Thanks,
Jeff.


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Re: [uml-devel] Kernel mode fault at addr 0x48965000, ip 0x400e51a4 (fwd)

[Jeff Chua]

Again, just to point out that uml-patch-2.4.22-5 _DOES_NOT_ have such
problem. Patches after uml-patch-2.4.22-5 all have this same problem.



Thanks,
Jeff


On Wed, 7 Jan 2004, Jeff Chua wrote:

>
> running with "strace -f klogd" ...
>
> munmap(0x4013b000, 4096)                = 0
> get_kernel_syms(0)                      = 956
> brk(0x80a9000)                          = 0x80a9000
> get_kernel_syms(0x8092118)              = 956
> open("/dev/kmem", O_RDONLY)             = 3
> _llseek(0x3, 0, 0xa8965000, 0xbffff934, 0) = 0
> read(3, Kernel panic: Kernel mode fault at addr 0x48965000, ip 0x400df1a4
>
>
> It seems to break while reading /dev/kmem
>
> Thanks,
> Jeff.
>
>
> -------------------------------------------------------
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Re: [uml-devel] Kernel mode fault at addr 0x48965000, ip 0x400e51a4 (fwd)

[BlaisorBlade]

Alle 19:23, martedì 6 gennaio 2004, Jeff Chua ha scritto:

> read(3, Kernel panic: Kernel mode fault at addr 0x48965000, ip 0x400df1a4
> It seems to break while reading /dev/kmem
This is likely, since a change to the /dev/kmem driver is in the patch 
starting with 2.4.22-6 (not in -5). It was needed to fix another bug. By the 
way, what is your exact command line? I've a suspect... (but I've been 
careful enough).

diff -Naur -X ../exclude-files orig/drivers/char/mem.c um/drivers/char/mem.c
--- orig/drivers/char/mem.c     2003-08-29 17:25:51.000000000 -0400
+++ um/drivers/char/mem.c       2003-11-09 03:17:45.000000000 -0500
@@ -209,6 +209,8 @@
        return 0;
 }

+extern unsigned long uml_physmem;
+
 /*
  * This function reads the *virtual* memory as seen by the kernel.
  */
@@ -219,7 +221,8 @@
        ssize_t read = 0;
        ssize_t virtr = 0;
        char * kbuf; /* k-addr because vread() takes vmlist_lock rwlock */
-
+
+       p += uml_physmem;
        if (p < (unsigned long) high_memory) {
                read = count;
                if (count > (unsigned long) high_memory - p)
@@ -268,7 +271,7 @@
                }
                free_page((unsigned long)kbuf);
        }
-       *ppos = p;
+       *ppos = p - uml_physmem;
        return virtr + read;
 }


-- 
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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