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Bug#394200: kernel freezes (no panic), seems related to acpid



Package: linux-2.6
Version: 2.6.17-3
Severity: important

See also: #391955 (same machine)

My X40 laptop hangs itself up with both 2.6.17-2-686 and
2.6.18-1-686 kernels *without sending a kernel panic via netconsole*
during the rc2.d startup sequence.

lapse:~# ls /etc/rc2.d
K00nstxcd@             S20cpufrequtils@  S20openbsd-inetd@  S89anacron@
K00openvpn@            S20cupsys@        S20postfix@        S89atd@
K08vmware@             S20dbus@          S20rsync@          S89cron@
README                 S20dictd@         S20smartmontools@  S90vmware@
S10syslog-ng@          S20gpm@           S20ssh@            S99fail2ban@
S15ibm-acpi@           S20hotkey-setup@  S20sysfsutils@     S99rc.local@
S19xdm@                S20ifplugd@       S23ntp@            S99rmnologin@
S20acpid@              S20laptop-mode@   S25bluetooth@      S99stop-bootlogd@
S20apt-index-watcher@  S20makedev@       S30mpd@
S20cpufreqd@           S20mixmaster@     S30squid@

With 2.6.17, the machine prints "Starting printing deamon: cupsd"
and hangs itself up hard. No sysrq-b or ctrl-alt-del make it
restart, I have to cold-cycle it (no reset button on the X40).

With 2.6.18, X blanks the screen just after starting cupsd, then
hangs. In both cases, the machine becomes equally unresponsive to
everything. No lights flash; hard lock.

If I boot into single-mode and start acpid manually, then reboot, it
freezes during the reboot as well. It shuts down processes and then
says "Will now reboot" followed by "Rebooting system" and hangs
right there and requires a cold-cycle.

If I move xdm to S99, where it is normally, or even just S21, the
boot process gets past cupsd and X starts fine, and it does not hang
itself up on reboot.

The problem does *not* occur with 2.6.16-1-686, and I have always
started xdm at S19.

The problem with the machine freezing while starting X first 
appeared after the support technician replaced a defective keyboard
in the middle of July, so probably after the 2.6.17-3 upgrade; I do
remember not using 2.6.17 right from the start due to
madwifi-related problems a friend of mine was experiencing.

In July, it was possible then to work around it by going to
single-user mode and pressing ctrl-d, so I thought it was a simple
timing issue. The machine would then run pretty stable. I did not
have dm-crypt partitions back then.

Since then, I have reinstalled the machine. The problem resurfaced
two weeks ago, and I called the technician, suspecting a hardware
defect. Together, we replaced the motherboard/CPU/RAM/e1000/graphics
card combo, tried with and without the WLAN and Bluetooth cards,
tried two mirrored harddisks, and replaced the keyboard again; the
problem persists -- it is thus somewhat unlikely to be a hardware
problem.

Please refer to #391955 for information about the machine hardware.
And please let me know whether you need more information.

-- System Information:
Debian Release: testing/unstable
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)
Shell:  /bin/sh linked to /bin/dash
Kernel: Linux 2.6.17-2-amd64
Locale: LANG=en_GB, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)

-- 
 .''`.   martin f. krafft <madduck@debian.org>
: :'  :  proud Debian developer, author, administrator, and user
`. `'`   http://people.debian.org/~madduck - http://debiansystem.info
  `-  Debian - when you have better things to do than fixing systems

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