[gentoo-user] xorg segfaults if I have an encrypted volume mounted

[Remy Blank <remy.blank@pobox.com>]

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xorg started segfaulting here on startup, at the point where it should
detect input devices:

[  1198.330] (II) AIGLX: enabled GLX_MESA_copy_sub_buffer
[  1198.330] (II) AIGLX: enabled GLX_INTEL_swap_event
[  1198.330] (II) AIGLX: enabled GLX_SGI_make_current_read
[  1198.330] (II) AIGLX: GLX_EXT_texture_from_pixmap backed by buffer
objects
[  1198.330] (II) AIGLX: Loaded and initialized /usr/lib/dri/i965_dri.so
[  1198.330] (II) GLX: Initialized DRI2 GL provider for screen 0
[  1198.331] (II) intel(0): Setting screen physical size to 507 x 317
[  1198.437]
Backtrace:
[  1198.437] 0: /usr/bin/X (xorg_backtrace+0x38) [0x80ae1c8]
[  1198.437] 1: /lib/libudev.so.0 (0xb782b000+0x33d2) [0xb782e3d2]
[  1198.437] Segmentation fault at address 0x7974702f
[  1198.437]
Fatal server error:
[  1198.437] Caught signal 11 (Segmentation fault). Server aborting

For reference, here's the same location in a good start:

[  2832.766] (II) AIGLX: enabled GLX_MESA_copy_sub_buffer
[  2832.766] (II) AIGLX: enabled GLX_INTEL_swap_event
[  2832.766] (II) AIGLX: enabled GLX_SGI_make_current_read
[  2832.766] (II) AIGLX: GLX_EXT_texture_from_pixmap backed by buffer
objects
[  2832.766] (II) AIGLX: Loaded and initialized /usr/lib/dri/i965_dri.so
[  2832.766] (II) GLX: Initialized DRI2 GL provider for screen 0
[  2832.767] (II) intel(0): Setting screen physical size to 507 x 317
[  2832.906] (II) config/udev: Adding input device Video Bus
(/dev/input/event8)
[  2832.906] (**) Video Bus: Applying InputClass "evdev keyboard catchall"
[  2832.906] (**) Video Bus: Applying InputClass "Keyboard-all"
[  2832.906] (II) LoadModule: "evdev"
[  2832.906] (II) Loading /usr/lib/xorg/modules/input/evdev_drv.so
[  2832.906] (II) Module evdev: vendor="X.Org Foundation"
[  2832.906]    compiled for 1.8.1.901, module version = 2.3.2
[  2832.907]    Module class: X.Org XInput Driver
[  2832.907]    ABI class: X.Org XInput driver, version 9.0

So it's segfaulting in libudev. And where it's getting weird is that it
only segfaults if I have one particular encrypted container mapped. The
container is a file mapped to /dev/loop0, opened with "cryptsetup
luksOpen" as "/dev/mapper/crypt-morpheus.athome". If I "luksClose" it
(but keep /dev/loop0), xorg starts normally.

Strangely, there is another encrypted container "/dev/mapper/crypt-swap"
mapped to my swap partition, but that one doesn't seem to interfere.

This symptom has only started today, and I haven't updated anything
udev- or xorg-related. However, I reboot rarely, and I did reboot today,
so it may be due to an earlier update.

Some version info:

  xorg-server-1.8.1.901
  xf86-input-evdev-2.3.2
  udev-149
  gentoo-sources-2.6.31-r6

Has anyone seen anything similar? Any idea how I could either work
around the issue or debug it? I have tried strace but couldn't extract
any meaningful information.

-- Remy


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