xorg 7.4 xserver crash (Debian GNU/hurd version) - libc issue ?

[computer.enthusiastic]

Hi,

I'm using Debian GNU/hurd (lastest current repository update) both in
a qemu and virtualbox environments.

I have installed the lastest version of xserver-xorg from debian GNU/
hurd repository, but the xserver crashes during graphics card module
startup
complaining about a segfault with the following backtrace in qemu
enviroment:

(II) Loading sub module "vgahw"
(II) LoadModule: "vgahw"
(II) Loading /usr/lib/xorg/modules//libvgahw.so
(II) Module vgahw: vendor="X.Org Foundation"
        compiled for 1.6.3, module version = 0.1.0
        ABI class: X.Org Video Driver, version 5.0
(II) CIRRUS(0): vgaHWGetIOBase: hwp->IOBase is 0x03d0, hwp->PIOOffset
is 0x0000
(II) Loading sub module "int10"
(II) LoadModule: "int10"
(II) Loading /usr/lib/xorg/modules//libint10.so
(II) Module int10: vendor="X.Org Foundation"
        compiled for 1.6.3, module version = 1.0.0
        ABI class: X.Org Video Driver, version 5.0
(II) CIRRUS(0): initializing int10

Backtrace:
0: /usr/bin/X(xorg_backtrace+0x3b) [0x8124e7b]
1: /usr/bin/X(xf86SigHandler+0x51) [0x80ba631]
2: /lib/libc.so.0.3 [0x11c2c92]
3: /usr/lib/xorg/modules//libint10.so(xf86int10GetBiosSegment+0xae)
[0x149e3ae]
4: /usr/lib/xorg/modules//libint10.so(xf86ExtendedInitInt10+0x25a)
[0x149f8ca]
5: /usr/lib/xorg/modules//libint10.so(xf86InitInt10+0x25) [0x149cf25]
6: /usr/lib/xorg/modules/drivers//cirrus_alpine.so(AlpPreInit+0x191)
[0x148c871]
7: /usr/bin/X(InitOutput+0xd9f) [0x80a6aef]
8: /usr/bin/X(main+0x1db) [0x806b2ab]
9: /lib/libc.so.0.3(__libc_start_main+0xa4) [0x11d3044]
10: /usr/bin/X [0x806a951]

and with the following backtrace in virtualbox enviroment:

(II) Loading sub module "vbe"
(II) LoadModule: "vbe"
(II) Loading /usr/lib/xorg/modules//libvbe.so
(II) Module vbe: vendor="X.Org Foundation"
        compiled for 1.6.3, module version = 1.1.0
        ABI class: X.Org Video Driver, version 5.0
(II) Loading sub module "int10"
(II) LoadModule: "int10"
(II) Loading /usr/lib/xorg/modules//libint10.so
(II) Module int10: vendor="X.Org Foundation"
        compiled for 1.6.3, module version = 1.0.0
        ABI class: X.Org Video Driver, version 5.0
(II) VESA(0): initializing int10

Backtrace:
0: /usr/bin/X(xorg_backtrace+0x3b) [0x8124e7b]
1: /usr/bin/X(xf86SigHandler+0x51) [0x80ba631]
2: /lib/libc.so.0.3 [0x11c2c92]
3: /usr/lib/xorg/modules//libint10.so(xf86int10GetBiosSegment+0xae)
[0x14913ae]
4: /usr/lib/xorg/modules//libint10.so(xf86ExtendedInitInt10+0x25a)
[0x14928ca]
5: /usr/lib/xorg/modules//libvbe.so(VBEExtendedInit+0x2de) [0x1487c1e]
6: /usr/lib/xorg/modules/drivers//vesa_drv.so [0x1471e14]
7: /usr/bin/X(InitOutput+0xd9f) [0x80a6aef]
8: /usr/bin/X(main+0x1db) [0x806b2ab]
9: /lib/libc.so.0.3(__libc_start_main+0xa4) [0x11d3044]
10: /usr/bin/X [0x806a951]

As you can see, xserver seems to fail in the same way in different
environments and with different graphic card modules.

Can it be a libc issue ?

How can I help you to fix this ?  And what else I can do to fix it (I
don't have experience in xserver debugging) ?

Do you think it could be usefull to post this message to Bug-Hurd <bug-
hurd@gnu.org> mailing list ?

Thanks in advance.