Re: [Xen-devel] problems compiling Xen 3.1.3 after making changes to the config

["Girish V" <girish.xen@xxxxxxxxx>]

Thanks Ian. I tried what you suggested and Xen compiled fine.

Now another problem has cropped up. When I try to boot up dom0, I get a kernel panic. I am compiling Xen 3.1.3 on FC5. I have made sure that all IDE modules (my disk is IDE) are compiled in and are not modules using the make menuconfig.

I am building the ramdisk using mkinitrd initrd.img 2.6.18.8-xen

My grub.conf is

------------------------------------------------
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You do not have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /, eg.
#          root (hd0,0)
#          kernel /boot/vmlinuz-version ro root=/dev/hda1
#          initrd /boot/initrd-version.img
#boot=/dev/hda
default=1
timeout=5
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
hiddenmenu
title Fedora Core (2.6.15-1.2054_FC5)
        root (hd0,0)
        kernel /boot/vmlinuz-2.6.15-1.2054_FC5 ro root=LABEL=/ rhgb quiet
        initrd /boot/initrd-2.6.15-1.2054_FC5.img

title Xen 3.1.3 (2.6.18-xen)
        root (hd0,0)
        kernel /boot/xen.gz dom0_mem=256M noreboot com1=38400,8n1 sync_console
        module /boot/vmlinuz-2.6.18-xen ro root=LABEL=/ console=ttyS0 console=tty pnacpi=off
        module /boot/initrd-3.1.3-xen.img
        #module /boot/initrd-3.0.2-xen-readme.img
        #module /boot/initrd-3.0.2-xen-preload.img
---------------------------------------

I have shown the panic message below. (Full boot up message in file attached)

________________________________________________

Freeing unused kernel memory: 196k freed
input: ImExPS/2 Generic Explorer Mouse as /class/input/input1
ide_disk: no version for "struct_module" found: kernel tainted.
BUG: unable to handle kernel paging request at virtual address 1eee0077
 printing eip:
c0161739
003e1000 -> *pde = 00000000:1ebe0001
003e0000 -> *pme = 00000000:00000000
Oops: 0000 [#1]
SMP
Modules linked in: ext3 jbd ide_disk
CPU:    0
EIP:    0061:[<c0161739>]    Tainted: GF     VLI
EFLAGS: 00000246   (2.6.18.8-xen #1)
EIP is at unmap_vmas+0x489/0x910
eax: 00000000   ebx: 1eee0067   ecx: 00000000   edx: 1eee0067
esi: 1eee0067   edi: 1eee0067   ebp: c03cca28   esp: c00d7eac
ds: 007b   es: 007b   ss: 0069
Process init (pid: 1, ti=c00d6000 task=c00d55f0 task.ti=c00d6000)
Stack: 1eee0067 00000000 d0250088 1eee0067 1eee0067 1eee0067 00000000 b7f45000
       c03dbf3c c00d7f68 1eee0067 00000000 003ff000 b7f45000 00000000 00000000
       b7f46000 c03e1010 c03e2e40 1eee0067 c1212200 00000000 00000000 c03e2e84
Call Trace:
 [<c015ab46>] __pagevec_lru_add_active+0xe6/0x130
 [<c016669b>] unmap_region+0x9b/0x120
 [<c01671ad>] do_munmap+0x14d/0x1e0
 [<c0167272>] sys_munmap+0x32/0x50
 [<c010562f>] syscall_call+0x7/0xb
Code: 00 3b b0 98 00 00 00 0f 84 5a 02 00 00 81 fe 00 e1 34 c0 0f 84 4e 02 00 00 8b 44 24 08 89 45 04 c7 45 00 40 00 00 00 8b 54 24 4c <f6> 42 10 01 0f 84 c2 01 00 00 83 6c 24 54 01 8b 44 24 4c e8 0f
EIP: [<c0161739>] unmap_vmas+0x489/0x910 SS:ESP 0069:c00d7eac
 <0>Kernel panic - not syncing: Attempted to kill init!
 (XEN) Domain 0 crashed: 'noreboot' set - not rebooting.
                                                        ________________________________________________

I tried searching for this "unable to handle kernel paging" error  on the mailing list, but I could not find any fix for it.

Any ideas why the kernel panic happens?

Thanks,
Girish

On Thu, Apr 3, 2008 at 6:01 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:

On Wed, 2008-04-02 at 16:17 -0400, Girish V wrote:
> Hello,
>
> I am trying to compile and boot Xen 3.1.3 with linux-2.6.18.8-xen on a
> FC5 machine (gcc 4.1.0).
>
> I modified the default linux-2.6.18.8-xen/.config file by doing the
> following
>
> 1) cd xen-3.1.3/linux-2.6.18.8-xen/

This should be xen-3.1.3/build-linux-2.6.18.8-xen_x86_32 then the rest
of your commands should work OK.

You will need to run "make mrproper" in xen-3.1.3/linux-2.6.18.8-xen to
undo what you did already.

The issues is that the Xen build system uses out of tree builds (the O=
in the output below) so source is in linux-2.6.18.8-xen and objects are
in build-* (this saves having multiple copies of the source).

You have caused the source tree to be used as an object tree which leads
to the error you have observed.

> 2) make menuconfig (marked ide drivers to be compiled in instead of as
> modules)
> 3) cd ../
> 4) make
>
> Make fails with the following message
> -------------------------------------------------------------------------------------------------------
>
>
>
> make[3]: Entering directory
> `/root/xen-3.1.3/build-linux-2.6.18.8-xen_x86_32'
> make -C /root/xen-3.1.3/linux-2.6.18.8-xen
> O=/root/xen-3.1.3/build-linux-2.6.18.8-xen_x86_32 vmlinuz
>   Using /root/xen-3.1.3/linux-2.6.18.8-xen as source for kernel
>   /root/xen-3.1.3/linux-2.6.18.8-xen is not clean, please run 'make
> mrproper'
>   in the '/root/xen-3.1.3/linux-2.6.18.8-xen' directory.
> make[5]: *** [prepare3] Error 1
> make[4]: *** [vmlinuz] Error 2
> make[3]: *** [vmlinuz] Error 2
> make[3]: Leaving directory
> `/root/xen-3.1.3/build-linux-2.6.18.8-xen_x86_32'
> make[2]: *** [build] Error 2
> make[2]: Leaving directory `/root/xen-3.1.3'
> make[1]: *** [linux-2.6-xen-install] Error 2
> make[1]: Leaving directory `/root/xen-3.1.3'
> make: *** [install-kernels] Error 1
>
> -------------------------------------------------------------------------------------------------------
>
>
> Any help is appreciated.
>
>
> Thanks,
> Girish
>

> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel

Attachment: kernel_panic
Description: Binary data

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