ת·¢: segment fault for fiasco-ux

[Adam Lackorzynski]

On Thu Dec 14, 2006 at 17:40:52 +0800, halo.duan wrote:
>  
> 
> Hi
> the linux kernel is 2.6.15-1.2054-FC5, gcc is 4.1.0 20060304.
> code is the latest update.
> 
> following is screen copy of gdb
> 
> Fiasco-UX on Linux 2.6.15-1.2054_FC5 (i686) Mapped 64 MB Memory + 0 KB
> Framebuffer + 0 MB Input Area on FD 6
> 
> Loading Module 0x00090000-0x00099380 [sigma0] Loading Module
> 0x00120000-0x002b09e4 [roottask]
> 
> Bootstrapping...
> 
> Welcome to Fiasco(ux)!
> DD-L4(v2)/x86 microkernel (C) 1998-2006 TU Dresden
> Rev: Fri Dec  8 18:40:04 2006 compiled with gcc 4.1.0 for Intel Pentium III
> 
> Detaching after fork from child process 2486.
> 
> Program received signal SIGSEGV, Segmentation fault.
> Dirq::alloc (this=0xd242d, t=0xd7b80, ack_in_kernel=-1)
>     at /home/halo/l4/kernel/fiasco/src/drivers/ux/processor-ux.cpp:62
> 62        asm volatile ("cli" : : : "memory");
> (gdb)
> 
> 
> according to the fiasco-ux documents, the SIGSEGV must be handled by fiasico
> registered handler. but I don't know why fiasco generate such enomous number
> of SYSSEGV.
> 
> so what's happened

That's how Fiasco-UX works, by intercepting such instructions. All those
segmentation faults are really ok.

To come back to your problem. Since you use a FC kernel... Do those
kernels use a different address space layout for users? Does the user
have 3G of address space available? Recent kernels (2.6.16 and up)
should have CONFIG_PAGE_OFFSET=0xC0000000 in their config.




Adam
-- 
Adam                 adam at os.inf.tu-dresden.de
  Lackorzynski         http://os.inf.tu-dresden.de/~adam/