I've been living with this bug since it appeared about two months ago.
$ tail -50 /var/log/Xorg.0.log.old
hwstam: 0xfffe ier: 0x0002 imr: 0x0000 iir: 0x00d0
Ring at virtual 0x7f5f789cb000 head 0x536c tail 0x5350 count 32761
000052ec: 02000000
000052f0: 54f00006
000052f4: 03cc2000
000052f8: 00080044
000052fc: 000c0048
00005300: 01000000
00005304: 00000000
00005308: 00000010
0000530c: 02000000
00005310: 54f00006
00005314: 03cc2000
00005318: 00080048
0000531c: 000c004c
00005320: 01000000
00005324: 00000000
00005328: 00000010
0000532c: 02000000
00005330: 54f00006
00005334: 03cc2000
00005338: 0008004c
0000533c: 000c0050
00005340: 01000000
00005344: 00000000
00005348: 00000010
0000534c: 02000000
00005350: 00000720
00005354: 00000000
00005358: 00000720
0000535c: 00000000
00005360: 00000720
00005364: 00000000
00005368: 00000720
0000536c: 00000000
Ring end
space: 20 wanted 32
(II) intel(0): [drm] removed 1 reserved context for kernel
(II) intel(0): [drm] unmapping 8192 bytes of SAREA 0x2efff000 at
0x7f5f8cd7b000
(II) intel(0): [drm] Closed DRM master.
Fatal server error:
lockup
(II) AIGLX: Suspending AIGLX clients for VT switch
(II) intel(0): xf86UnbindGARTMemory: unbind key 0
(II) intel(0): xf86UnbindGARTMemory: unbind key 1
(II) intel(0): xf86UnbindGARTMemory: unbind key 2
(II) intel(0): xf86UnbindGARTMemory: unbind key 3
(II) intel(0): xf86UnbindGARTMemory: unbind key 4
The xorg.conf is stock:
$ cat /etc/X11/xorg.conf
# xorg.conf (X.Org X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool,
using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades
*only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically
updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "XkbRules" "xorg"
Option "XkbModel" "pc104"
Option "XkbLayout" "us"
EndSection
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
EndSection
Section "Device"
Identifier "Configured Video Device"
EndSection
Section "Monitor"
Identifier "Configured Monitor"
EndSection
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
EndSection
Hardware
$ lspci
00:00.0 Host bridge: Intel Corporation 82945G/GZ/P/PL Memory Controller
Hub (rev 02)
00:02.0 VGA compatible controller: Intel Corporation 82945G/GZ
Integrated Graphics Controller (rev 02)
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High
Definition Audio Controller (rev 01)
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI
Controller #1 (rev 01)
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI
Controller #2 (rev 01)
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI
Controller #3 (rev 01)
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI
Controller #4 (rev 01)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI
Controller (rev 01)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1)
00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC
Interface Bridge (rev 01)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE
Controller (rev 01)
00:1f.2 IDE interface: Intel Corporation 82801GB/GR/GH (ICH7 Family)
SATA IDE Controller (rev 01)
00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller
(rev 01)
01:05.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 10)
Error occurs on both i386 and AMD64. Using non-free Flash doesn't seem
to be relevant, as the same thing happens with swfdec.
I'm guessing that the problem is related to the move to libxul and
Iceweasel 3.0, because the error started happening at that time and
occurs whether I use IW or Epiphany-gecko.
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