Re: [Xen-devel] latest pv_ops dom0 (2.6.29-rc6) crashes / unhandled page fault

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Mar 02, 2009 at 05:38:54PM -0800, Jeremy Fitzhardinge wrote:
> Pasi Kärkkäinen wrote:
> >Hello.
> >
> >log of the crashing boot process:
> >http://pasik.reaktio.net/xen/pv_ops-dom0-debug/pv_ops-dom0-bootlog-14-xen331-linux-2.6.29-rc6-crash.txt
> >
> >2.6.29-rc5 based pv_ops dom0 works on the same computer.. with the same 
> >Xen version.
> >
> >I tried with and without pci=nomsi.
> >
> >adding 'noapic' doesn't seem to help (I need that with 2.6.29-rc5 to make 
> >it work).
> >  
> 
> 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?
> 

Unfortunately I had already ran "make clean" on that tree, and upgraded my
distro packages up-to-date, so can't check.. 

But I rebuilt the latest tree now, and verified it crashes aswell..
different memory address this time though (probably because of different git
tree + different gcc version).

Now it crashes at:

(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] = 000000003d203001 00001203
(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:[<c0876b43>]
(XEN) EFLAGS: 00000297   EM: 1   CONTEXT: pv guest


# 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 0xc0876b43
0xc0876b43 <xen_map_identity_early+157>:        mov    (%edi,%ebx,8),%edx
(gdb) 


Hopefully that helps.. 

-- Pasi

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