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Bug#596419: xen-linux-system-2.6.32-5-xen-amd64: causes a system hangup by the shutdown of the system, aacraid (sw raid) involved in hangup

Package: xen-linux-system-2.6.32-5-xen-amd64
Version: 2.6.32-21
Severity: critical
Justification: breaks the whole system

On the system is installed sw raid, raid1 is used.
There are 3 RAID1 volumes made as partition mirroring of 3 partitions,
1. for the system (is installed there), 2. and 3. for LVM.
LVM is not involved in this problem.
There is also installed a minimum gnome with the command
aptitude install -R xorg gnome-core gdm

The error came till now twice during the reboot of the system,
last message before the hangup was "Stopping gdm" and then came the error
and complete system hangup, the only way how to proceed was 
to perform a cold restart.

I looked into the /etc/rc.? ?={0|1|6} what is the order of the shutdown scripts
used by the shutdown and it seems
it could not to be related to gnome,
because immediatelly after the gdm stop 
is performed the "mdadm stop", what causes with very high probability
the system hangup.

It is a very serious problem, I cannot safely reboot the system

After the restart for sure always the raid must be resynchronized, etc.

I will try to get more description of the hangup and attach it to this bugreport.

The error occurs on HP ProLiant DL320 G6 with E5506 Intel Xeon CPU

-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-xen-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages xen-linux-system-2.6.32-5-xen-amd64 depends on:
ii  linux-image-2.6.32-5-xen-amd 2.6.32-21   Linux 2.6.32 for 64-bit PCs, Xen d
ii  xen-hypervisor-4.0-amd64 [xe 4.0.1~rc6-1 The Xen Hypervisor on AMD64

xen-linux-system-2.6.32-5-xen-amd64 recommends no packages.

xen-linux-system-2.6.32-5-xen-amd64 suggests no packages.

-- no debconf information

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