Re: [Xen-devel] Re: Continuing problems booting

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Gerd Hoffmann wrote:
> Update: latest kernel (rc7 based) crashes.  rc6 from somewhen last week
> is the working one.  rc7 messages:
>
> unhandled page fault (ec=0003)
> page table walk from c1c55000
>  l1[0x055] = 9c55061 1c55
>
> -> rw access to r/o page?
>
> EIP c140f4c3
>
> c140f2d2 <alloc_bootmem_core>:
> [ ... ]
> c140f4c3:       f3 ab                   rep stos %eax,%es:(%edi)
>
> -> memset(page,0,PAGE_SIZE) ?
>
> Dom0 domain builder says page tables are at c1c55000 -> c1c6a000
>
> /me guesses the initial page tables are released to the page allocator,
> but still they are mapped r/o  =>  boom as soon as one happens to get
> allocated.  Which probably happens very soon on memory-constrained
> machines like mine, while other might stay up longer and show strange
> bugs later on ;)
>   
Hm.  You should see "XEN PAGETABLES" in the early reservations, which 
should protect them from then on.  Oh, look, its only doing it in the 
64-bit setup.
> BTW: The trick to see the messages on the laptop screen is:
>
>  kernel /xen-3.3.gz vga=text-80x50,keep
>  module /vmlinuz-2.6.29-rc7-tip-kraxel ro root=/dev/zen/rawhide \
>         console=hvc0
>   
Hm, OK.  But normal vga console should work.  Works fine on 64-bit; 
can't think of why they might differ...
   J

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