[Xen-devel] Re: Crash when booting 32-bit kernel with pvgrub

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 08/17/09 05:46, Samuel Thibault wrote:
> Jeremy Fitzhardinge, le Fri 14 Aug 2009 15:44:49 -0700, a écrit :
>   
>> I'm trying to boot a 32-bit PV guest on a 64-bit xen+dom0 system, and it
>> crashes as soon as I select a kernel:
>>
>>
>>   Booting 'Fedora (2.6.27.19-170.2.35.fc10.i686.PAE)'
>>
>> root (hd0,0)
>> Error ENOENT when reading the backend path device/vkbd/0/backend
>>     
> I guess you do not have pvfb enable?
>   

No.

>> Page fault at linear address 0x1c, eip 0x4b6ee, regs 0xb4ff7c, sp 0xb4fff0, 
>> our_sp 0xb4ff50, code 2
>> Thread: kbdfront
>>     
> Oops, dev->backend isn't allocated at this point and dev isn't zeroed,
> here is a patch.
>   

Unfortunately this didn't solve the problem for me; it looks unchanged
with the patch applied.

    J

> Samuel
>
>
> Zero kbdfront and fbfront dev structures to fix free_kbdfront() and
> free_fbfront() on error.
>
> Signed-Off-By: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
>
> diff -r 41b2c4e4f674 extras/mini-os/fbfront.c
> --- a/extras/mini-os/fbfront.c        Wed Jul 29 09:20:46 2009 +0100
> +++ b/extras/mini-os/fbfront.c        Mon Aug 17 14:45:43 2009 +0200
> @@ -80,6 +80,7 @@
>      printk("******************* KBDFRONT for %s **********\n\n\n", nodename);
>  
>      dev = malloc(sizeof(*dev));
> +    memset(dev, 0, sizeof(*dev));
>      dev->nodename = strdup(nodename);
>  #ifdef HAVE_LIBC
>      dev->fd = -1;
> @@ -403,6 +404,7 @@
>      printk("******************* FBFRONT for %s **********\n\n\n", nodename);
>  
>      dev = malloc(sizeof(*dev));
> +    memset(dev, 0, sizeof(*dev));
>      dev->nodename = strdup(nodename);
>  #ifdef HAVE_LIBC
>      dev->fd = -1;
>
>   


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