Comment 25 for bug 890475

Ok, 3.2-rc2 isn't booting. I see lots of these errors:
[ 29.078074] scsi: killing requests for dead queue
[ 29.078076] scsi: killing requests for dead queue
[ 29.078193] scsi: killing requests for dead queue
[ 29.078195] scsi: killing requests for dead queue

Seems to be http://www.spinics.net/lists/linux-scsi/msg55348.html

The boot process finally dies with the following:

[ 88.715404] Copyright (c) 2007-2011 Intel Corporation.
[ 88.715781] sd 4:2:1:0: [sdb] Attached SCSI disk
[ 88.715786] sd 4:2:0:0: [sda] Attached SCSI disk
[ 88.805205] INFO: rcu_sched detected stalls on CPUs/tasks: { 8} (detected by 3, t=15002 jiffies)
[ 88.805210] Pid: 0, comm: kworker/0:1 Not tainted 3.2.0-030200rc2-generic #201111151435
[ 88.805211] Call Trace:
[ 88.805213] <IRQ> [<ffffffff810df45f>] print_other_cpu_stall+0x15f/0x1b0
[ 88.805221] [<ffffffff8109a220>] ? tick_nohz_handler+0xf0/0xf0
[ 88.805223] [<ffffffff810df528>] __rcu_pending+0x78/0x290
[ 88.805225] [<ffffffff810df7ba>] rcu_check_callbacks+0x7a/0x1c0
[ 88.805229] [<ffffffff81074db8>] update_process_times+0x48/0x90
[ 88.805230] [<ffffffff8109a286>] tick_sched_timer+0x66/0xc0
[ 88.805234] [<ffffffff8108cb54>] __run_hrtimer+0x84/0x1e0
[ 88.805237] [<ffffffff8101a529>] ? read_tsc+0x9/0x20
[ 88.805239] [<ffffffff8108cf46>] hrtimer_interrupt+0xd6/0x210
[ 88.805242] [<ffffffff81619809>] smp_apic_timer_interrupt+0x69/0x99
[ 88.805245] [<ffffffff816176de>] apic_timer_interrupt+0x6e/0x80
[ 88.805246] <EOI> [<ffffffff81371d70>] ? intel_idle+0xe0/0x150
[ 88.805249] [<ffffffff81371d56>] ? intel_idle+0xc6/0x150
[ 88.805252] [<ffffffff814de2b4>] cpuidle_idle_call+0xc4/0x190
[ 88.805254] [<ffffffff8101309b>] cpu_idle+0xcb/0x120
[ 88.805257] [<ffffffff816078eb>] start_secondary+0xde/0xe0
...
Gave up waiting for root device. Common problems:
 - Boot args (cat /proc/cmdline)
   - Check rootdelay= (did the system wait long enough?)
   - Check root= (did the system wait for the right device?)
 - Missing modules (cat /proc/modules; ls /dev)
ALERT! /dev/mapper/trunks-lv_root does not exist. Dropping to a shell!