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[Xen-bugs] [Bug 1536] New: BUG: unable to handle kernel NULL pointer der

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Subject: [Xen-bugs] [Bug 1536] New: BUG: unable to handle kernel NULL pointer dereference at 000001ff
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Date: Sat, 7 Nov 2009 08:40:04 -0800
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           Summary: BUG: unable to handle kernel NULL pointer dereference at
           Product: Xen
           Version: unspecified
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Guest-OS
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: adacroce@xxxxxxxxx

Hardware configuration:
AMD Athlon xp2600+ 

Dom0 configuration:
SO : Gentoo  Linux x86 
Kernel : 2.6.31-xen-r7
Xen : version : 3.4.1

xm info:
host                   : pegasus
release                : 2.6.31-xen-r7
version                : #2 Fri Nov 6 15:52:19 CET 2009
machine                : i686
nr_cpus                : 1
nr_nodes               : 1
cores_per_socket       : 1
threads_per_core       : 1
cpu_mhz                : 1905
hw_caps                :
virt_caps              : 
total_memory           : 2047
free_memory            : 1524
node_to_cpu            : node0:0
node_to_memory         : node0:1524
xen_major              : 3
xen_minor              : 4
xen_extra              : .1
xen_caps               : xen-3.0-x86_32p 
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xf5800000
xen_changeset          : unavailable
cc_compiler            : gcc version 4.3.4 (Gentoo 4.3.4 p1.0, pie-10.1.5) 
cc_compile_by          : root
cc_compile_domain      : homenet.telecomitalia.it
cc_compile_date        : Sat Oct 31 12:07:46 CET 2009
xend_config_format     : 4

DomU configuration:
SO : Gentoo linux 
Kernel : 2.6.30-gentoo-r8
Ram: 128 M

When I launch any programm for update or install package (emerge or eix) the
domU crash and freeze.

Emerge is a tool python-based. I can't understand how this could compromize the
guest's kernel since everything else I tried is running smooth (ie. creating
file, ls, running an interative python console). 

Furthermore I tried for domU kernel:
kernel-vanilla- taken from kernel.org
kernel-vanilla- taken from vanilla-sources on gentoo repository
kernel-2.6.30-gentoo-r8 taken from gentoo sources
kernel-2.6.30-xen-r1/kernel-2.6.31-xen-r1 taken from

all xen-patch for ebuild kernel taken from

This is error I see in dom0 console: 

BUG: unable to handle kernel NULL pointer dereference at 000001ff
IP: [<c0207576>] math_state_restore+0x64/0x76
*pdpt = 0000000048557001 
Thread overran stack, or stack corrupted
Oops: 0000 [#1] 
last sysfs file: /sys/block/xvda2/removable

Pid: 3835, comm: python2.6 Not tainted (2.6.30-gentoo-r8 #1) 
EIP: 0061:[<c0207576>] EFLAGS: 00210046 CPU: 0
EIP is at math_state_restore+0x64/0x76

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