RE: [Xen-devel] writable page tables appear to be causing xen to lock up

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> I've just tried enabling writable page tables in FreeBSD.
> 
> I'm seeing the following code in traps.c hit over again. 
> Disabling the DPRINTK on line 341 doesn't help, it just 
> causes the machine to become unresponsive quietly.

You'll have to give us a bit more to go on. I presume this is in
unstable?

It's probably worth adding a show_stack and a show_guest_stack to see
how you're getting there.

Ian
 
> xen_fault:      
> 
> if ( likely((fixup = search_exception_table(regs->eip)) != 0) )     {
>         perfc_incrc(copy_user_faults);         
>         if ( !shadow_mode_enabled(d) )
>             DPRINTK("Page fault: %p -> %p\n", regs->eip, fixup);
>         regs->eip = fixup;         
>         return 0;
>     }
> 
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