After update to debian etch the system freeze when comming up on a
2.6.15.4 (vanilla) i686
under tty i run a
X :2 -configure which leads to SIG11 
the freeze allready reported in outher BUGREPORTS
hopefully the backtrace will help to bring light to the darkness

_XSERVTransSocketOpenCOTSServer: Unable to open socket for inet6
_XSERVTransOpen: transport open failed for inet6/pegasus:2
_XSERVTransMakeAllCOTSServerListeners: failed to open listener for inet6

X Window System Version 6.9.0 (Debian 6.9.0.dfsg.1-4 20060114230205 David
Nusinow <dnusinow@debian.org>)
Release Date: 21 December 2005
X Protocol Version 11, Revision 0, Release 6.9
Build Operating System: Linux 2.6.15-1-686 i686 [ELF]
Current Operating System: Linux pegasus 2.6.15.4-radeon #7 PREEMPT Sun Feb 12
11:56:32 CET 2006 i686
Build Date: 14 January 2006
    Before reporting problems, check http://wiki.X.Org
    to make sure that you have the latest version.
Module Loader present
OS Kernel: Linux version 2.6.15.4-radeon (root@pegasus) (gcc-Version 3.4.5
(Debian 3.4.5-1)) #7 PREEMPT Sun Feb 12 11:56:32 CET 2006
Markers: (--) probed, (**) from config file, (==) default setting,
    (++) from command line, (!!) notice, (II) informational,
    (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.2.log", Time: Tue Feb 14 10:12:11 2006
(II) Open ACPI successful (/var/run/acpid.socket)
(II) Module ABI versions:
    X.Org ANSI C Emulation: 0.2
    X.Org Video Driver: 0.8
    X.Org XInput driver : 0.5
    X.Org Server Extension : 0.2
    X.Org Font Renderer : 0.4
(II) Loader running on linux
(II) LoadModule: "bitmap"
(II) Loading /usr/X11R6/lib/modules/fonts/libbitmap.so
(II) Module bitmap: vendor="X.Org Foundation"
    compiled for 6.9.0, module version = 1.0.0
    Module class: X.Org Font Renderer
    ABI class: X.Org Font Renderer, version 0.4
(II) Loading font Bitmap
(II) LoadModule: "pcidata"
(II) Loading /usr/X11R6/lib/modules/libpcidata.so
(II) Module pcidata: vendor="X.Org Foundation"
    compiled for 6.9.0, module version = 1.0.0
    ABI class: X.Org Video Driver, version 0.8
(--) using VT number 10

(II) PCI: PCI scan (all values are in hex)
(II) PCI: 00:00:0: chip 1106,3189 card 1043,807f rev 00 class 06,00,00 hdr 00
(II) PCI: 00:01:0: chip 1106,b168 card 0000,0000 rev 00 class 06,04,00 hdr 01
(II) PCI: 00:0b:0: chip 1106,3044 card 1106,3044 rev 46 class 0c,00,10 hdr 00
(II) PCI: 00:0d:0: chip 9005,0010 card 9005,a180 rev 00 class 01,00,00 hdr 00
(II) PCI: 00:0e:0: chip 1274,5880 card 1274,2000 rev 02 class 04,01,00 hdr 00
(II) PCI: 00:10:0: chip 1106,3038 card 1043,80a1 rev 80 class 0c,03,00 hdr 80
(II) PCI: 00:10:1: chip 1106,3038 card 1043,80a1 rev 80 class 0c,03,00 hdr 80
(II) PCI: 00:10:2: chip 1106,3038 card 1043,80a1 rev 80 class 0c,03,00 hdr 80
(II) PCI: 00:10:3: chip 1106,3104 card 1043,80a1 rev 82 class 0c,03,20 hdr 00
(II) PCI: 00:11:0: chip 1106,3177 card 1043,80a1 rev 00 class 06,01,00 hdr 80
(II) PCI: 00:11:1: chip 1106,0571 card 1043,80a1 rev 06 class 01,01,8a hdr 00
(II) PCI: 00:12:0: chip 1106,3065 card 1043,80a1 rev 74 class 02,00,00 hdr 00
(II) PCI: 01:00:0: chip 1002,4153 card 17af,201c rev 00 class 03,00,00 hdr 80
(II) PCI: 01:00:1: chip 1002,4173 card 17af,201d rev 00 class 03,80,00 hdr 00
(II) PCI: End of PCI scan
(II) Host-to-PCI bridge:
(II) Bus 0: bridge is at (0:0:0), (0,0,1), BCTRL: 0x0008 (VGA_EN is set)
(II) Bus 0 I/O range:
    [0] -1  0   0x00000000 - 0x0000ffff (0x10000) IX[B]
(II) Bus 0 non-prefetchable memory range:
    [0] -1  0   0x00000000 - 0xffffffff (0x0) MX[B]
(II) Bus 0 prefetchable memory range:
    [0] -1  0   0x00000000 - 0xffffffff (0x0) MX[B]
(II) PCI-to-PCI bridge:
(II) Bus 1: bridge is at (0:1:0), (0,1,1), BCTRL: 0x0008 (VGA_EN is set)
(II) Bus 1 I/O range:
    [0] -1  0   0x0000d000 - 0x0000dfff (0x1000) IX[B]
(II) Bus 1 non-prefetchable memory range:
    [0] -1  0   0xde800000 - 0xdfefffff (0x1700000) MX[B]
(II) Bus 1 prefetchable memory range:
    [0] -1  0   0xe0000000 - 0xfbffffff (0x1c000000) MX[B]
(II) PCI-to-ISA bridge:
(II) Bus -1: bridge is at (0:17:0), (0,-1,-1), BCTRL: 0x0008 (VGA_EN is set)
(--) PCI:*(1:0:0) ATI Technologies Inc RV350 AS [Radeon 9550] rev 0, Mem @
0xf0000000/27, 0xdf000000/16, I/O @ 0xd800/8, BIOS @ 0xeffe0000/17
(--) PCI: (1:0:1) ATI Technologies Inc RV350 ? [Radeon 9550] (Secondary) rev 0,
Mem @ 0xe0000000/27, 0xde800000/16

   *** If unresolved symbols were reported above, they might not
   *** be the reason for the server aborting.

Backtrace:
0: X(xf86SigHandler+0x88) [0x80897b8]
1: [0xffffe420]
2: X(xf86DriverlistFromCompile+0x29) [0x80813b9]
3: X(DoConfigure+0x11) [0x8073dc1]
4: X(InitOutput+0x655) [0x8071a05]
5: X(main+0x239) [0x80d6589]
6: /lib/tls/libc.so.6(__libc_start_main+0xd0) [0xb7ddbed0]
7: X [0x8070131]

Fatal server error:
Caught signal 11.  Server aborting