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Since I've installed Ubuntu 12.04 x64 on wife's new laptop it's constantly (but not always) hanging on reboot or shutdown. Killing X server (with ctrl+alt+backspace) has the same issue. Sometimes it hangs with only desktop picture shown, but sometimes it prints some information:

fsck █ █ util-linux 2.20.1
fsck █ █ util-linux 2.20.1
/dev/sda6: clean, 319000/4276224 files, 1601835/17089536 blocks
/dev/sda7: clean, 127051/7331840 files, 17528488/29296640 blocks
Skipping profile in /etc/apparmor.d/disable: usr.bin.firefox
Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd
 * Starting AppArmor profiles
speech-dispatcher disabled; edit /etc/default/speech-dispatcher
saned disabled; edit /etc/default/saned
acpid: starting up with proc fs
acpid: 35 rules loaded
acpid: waiting for events: event logging is off
 * Chacking battery state...

cpid: exiting
Checking for running unattended-upgrades:
speech-dispatcher disabled; edit /etc/default/speech-dispatcher
[ 1932.475214 ] INFO: rcu_bh detected stalls on CPUs/tasks: {2} (dected by 1, t=15002 jiffies)
[ 1932.475309 ] INFO: Stall ended before state dump start
[ 1982.273623 ] INFO: rcu_bh detected stalls on CPUs/tasks: {2} (dected by 3, t=15004 jiffies)
[ 1982.273720 ] INFO: Stall ended before state dump start
[ 2112.161349 ] INFO: rcu_bh detected stalls on CPUs/tasks: {2} (dected by 1, t=60008 jiffies)
[ 2112.161453 ] INFO: Stall ended before state dump start

The last line couples repeats endlessly with some delay until I force poweroff laptop. I have no idea on what this all means.

Any help with that?

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