Bug#438736: intel driver produces kernel crash in a variety of situations

[Robert Millan <rmh@aybabtu.com>]

Package: linux-image-2.6.18-5-amd64
Version: 2.6.18.dfsg.1-13etch1
Severity: important

I've recently upgraded my hardware (motherboard + cpu + ram) and am now
getting Linux crashes in a variety of situations.  I've detected them
when any of the following conditions are met:

  - When starting a second X session.
  - When time goes backwards (e.g. due to ntpdate) while X is running (but
    NOT when X isn't running)
  - When stopping X.

When this happens, terminal is switched to console, and a kernel backtrace is
displayed.  As for the backtrace, I've seen it at least once hitting functions
related to intel driver, but it seems to be completely different every time.
I can get it captured if that's of any use.

Also, sometimes the crash is complete, and sometimes SysReq key responds
allowing for a cleaner reboot.

Some notes on my system:

  - Two cpu cores (Could parallelism be an issue?  If it's possible to disable
    SMP without recompile I could give that a quick try)

  - X driver is xserver-xorg-video-i810.  Card model:

$ sudo lspci -v
[...]
00:02.0 VGA compatible controller: Intel Corporation 945G/GZ Express Integrated Graphics Controller (rev 02) (prog-if 00 [VGA])
        Subsystem: ASRock Incorporation Unknown device 2772
        Flags: bus master, fast devsel, latency 0, IRQ 11
        Memory at fea80000 (32-bit, non-prefetchable) [size=512K]
        I/O ports at cc00 [size=8]
        Memory at d0000000 (32-bit, prefetchable) [size=256M]
        Memory at fea40000 (32-bit, non-prefetchable) [size=256K]
        Capabilities: [90] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable-
        Capabilities: [d0] Power Management version 2
[...]

-- System Information:
Debian Release: 4.0
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-5-amd64
Locale: LANG=ca_AD.UTF-8, LC_CTYPE=ca_AD.UTF-8 (charmap=UTF-8)

Versions of packages linux-image-2.6.18-5-amd64 depends on:
ii  coreutil 5.97-5.3                        The GNU core utilities
ii  debconf  1.5.11                          Debian configuration management sy
ii  e2fsprog 1.39+1.40-WIP-2006.11.14+dfsg-2 ext2 file system utilities and lib
ii  initramf 0.85h                           tools for generating an initramfs
ii  module-i 3.3-pre4-2                      tools for managing Linux kernel mo

linux-image-2.6.18-5-amd64 recommends no packages.

-- debconf information excluded