random segfaults and general protection faults

i have been getting several segfaults per day, as well as general protection faults and bad page table.

[18174.406058] usb 1-3: USB disconnect, address 2
[18245.489028] mtrr: no MTRR for f0000000,4000000 found

[26173.207246] __ratelimit: 37 callbacks suppressed
[26173.207257] python[5143]: segfault at 55 ip 0810602d sp bf9fc500 error 4 in python2.6[8048000+1d3000]

[ 32.578093] __ratelimit: 36 callbacks suppressed
[ 32.578103] nm-applet[2195]: segfault at 2e10ab10 ip 00597ff9 sp bfb2be18 error 6 in libglib-2.0.so.0.2200.2[597000+1000]
[ 34.106378] gnome-session[2069] general protection ip:505cc9 sp:bfb9a9b8 error:0 in libdbus-1.so.3.4.0[4de000+37000]

[ 653.535627] __ratelimit: 36 callbacks suppressed
[ 653.535636] eog[7826] general protection ip:2f0a8b sp:bfad6990 error:0 in libgobject-2.0.so.0.2200.2[2cf000+3c000]
[ 2050.656927] gnome-settings-[3165]: segfault at 4e75c24 ip 005c6d12 sp 00aa9de8 error 6 in libgconf-2.so.4.1.5[5aa000+2f000]
[ 2972.125208] gnome-terminal[3292]: segfault at 0 ip 00a4dfab sp bfb72aa8 error 4 in libgobject-2.0.so.0.2200.2[a2c000+3c000]

i have tried the pea kernel, and setting randomize_va_space to zero, but neither help.

i have run memcheck overnight with no errors

ProblemType: Bug
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: sam 3556 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'CMI8738'/'C-Media CMI8738 (model 55) at 0xb800, irq 17'
   Mixer name : 'CMedia PCI'
   Components : ''
   Controls : 41
   Simple ctrls : 22
Date: Fri Dec 11 10:32:06 2009
DistroRelease: Ubuntu 9.10
HibernationDevice: RESUME=/dev/sda5
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.
Lsusb:
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: System Manufacturer System Name
Package: linux-image-2.6.31-16-generic-pae 2.6.31-16.53
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.31-16-generic-pae root=UUID=10dac7a3-6386-4e80-bd7f-3f3b9bcb0967 ro quiet splash
ProcEnviron:
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-16.53-generic-pae
RelatedPackageVersions:
 linux-backports-modules-2.6.31-16-generic-pae N/A
 linux-firmware 1.25
RfKill:

SourcePackage: linux
Uname: Linux 2.6.31-16-generic-pae i686
XsessionErrors:
 (gnome-settings-daemon:3571): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (gnome-settings-daemon:3571): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (nautilus:3629): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed
 (polkit-gnome-authentication-agent-1:3635): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
dmi.bios.date: 04/11/2002
dmi.bios.vendor: Award Software, Inc.
dmi.bios.version: ASUS A7M266-D ACPI BIOS Revision 1005A
dmi.board.name: A7M266-D
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: REV 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 7
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAwardSoftware,Inc.:bvrASUSA7M266-DACPIBIOSRevision1005A:bd04/11/2002:svnSystemManufacturer:pnSystemName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnA7M266-D:rvrREV1.xx:cvnChassisManufacture:ct7:cvrChassisVersion:
dmi.product.name: System Name
dmi.product.version: System Version
dmi.sys.vendor: System Manufacturer