Re: [Xen-devel] latest pv_ops dom0 (2.6.29-rc7) crashes

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, Mar 04, 2009 at 12:44:09PM -0800, Jeremy Fitzhardinge wrote:
> Pasi Kärkkäinen wrote:
> >On Tue, Mar 03, 2009 at 07:41:49PM +0200, Pasi Kärkkäinen wrote:
> >  
> >>>> 
> >>>>        
> >>>Yeah, something got broken.  Tracking it down now.
> >>>
> >>>      
> >>>>Any ideas what's going on? 
> >>>>
> >>>>(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch 
> >>>>input to Xen)
> >>>>(XEN) Freed 112kB init memory.
> >>>>mapping kernel into physical memory
> >>>>(XEN) d0:v0: unhandled page fault (ec=0000)
> >>>>(XEN) Pagetable walk from bffff000:
> >>>>(XEN)  L3[0x002] = 000000003d204001 00001204
> >>>>(XEN)  L2[0x1ff] = 0000000000000000 ffffffff 
> >>>>(XEN) domain_crash_sync called from entry.S (ff1a2c9e)
> >>>>(XEN) Domain 0 (vcpu#0) crashed on cpu#0:
> >>>>(XEN) ----[ Xen-3.3.1  x86_32p  debug=n  Not tainted ]----
> >>>>(XEN) CPU:    0
> >>>>(XEN) EIP:    e019:[<c0879716>]
> >>>> 
> >>>>        
> >>>What does this map to in your vmlinux?
> >>>
> >>>      
> >
> >Just upgraded to latest tree (as of some hours ago), and I still get the
> >same crash:
> >
> >http://pasik.reaktio.net/xen/pv_ops-dom0-debug/pv_ops-dom0-bootlog-16-xen331-linux-2.6.29-rc6-crash.txt
> >
> >(XEN) Freed 112kB init memory.
> >mapping kernel into physical memory
> >(XEN) d0:v0: unhandled page fault (ec=0000)
> >(XEN) Pagetable walk from bffff000:
> >(XEN)  L3[0x002] = 000000003d204001 00001204
> >(XEN)  L2[0x1ff] = 0000000000000000 ffffffff 
> >(XEN) domain_crash_sync called from entry.S (ff1a2c9e)
> >(XEN) Domain 0 (vcpu#0) crashed on cpu#0:
> >(XEN) ----[ Xen-3.3.1  x86_32p  debug=n  Not tainted ]----
> >(XEN) CPU:    0
> >(XEN) EIP:    e019:[<c0877902>]
> >
> >
> >[root@dom0test linux-2.6-xen]# gdb vmlinux
> >GNU gdb Fedora (6.8-29.fc10)
> >Copyright (C) 2008 Free Software Foundation, Inc.
> >License GPLv3+: GNU GPL version 3 or later
> ><http://gnu.org/licenses/gpl.html>
> >This is free software: you are free to change and redistribute it.
> >There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> >and "show warranty" for details.
> >This GDB was configured as "i386-redhat-linux-gnu"...
> >(gdb) x/i 0xc0877902
> >0xc0877902 <xen_map_identity_early+157>:        mov    (%edi,%ebx,8),%edx
> >  
> 
> Yep, working on it at the moment.
> 

Wow, latest tree (2.6.29-rc7) _almost_ boots now! 

First time ever (on my testing box) disk attached to ata_piix is now actually 
detected and seems to work.. at least partly!

See:
http://pasik.reaktio.net/xen/pv_ops-dom0-debug/pv_ops-dom0-bootlog-17-xen331-linux-2.6.29-rc7-crash.txt

But now I get crash when init is started..

Starting udev: BUG: unable to handle kernel paging request at c1106840
IP: [<c04045ef>] get_phys_to_machine+0x24/0x29
*pdpt = 000000005fa7a001 
Thread overran stack, or stack corrupted


[root@dom0test linux-2.6-xen]# gdb vmlinux
GNU gdb Fedora (6.8-29.fc10)
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i386-redhat-linux-gnu"...
(gdb) x/i 0xc04045ef
0xc04045ef <get_phys_to_machine+36>:    mov    (%eax,%ecx,4),%eax
(gdb) 


-- Pasi

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