カーネルパラメーター "intel_iommu=on iommu=pt" で Red Hat Enterprise Linux-6 サーバーを起動するとカーネルパニックが発生する

Issue

• シリアルコンソールでカーネルパニックメッセージが取得されました。

dmar:DRHD: handling fault status reg 302
dmar:DMAR:[DMA Read] Request device [3:00.0] fault addr 62de81000
DMAR:[fault reason 06] PTE Read access is not set
:megasr[cfg]: err ldf RCL packet free logic error
:megasr[raid_key]:[x] RAID5 support    [x] SAS drive support
scsi0 :LSI MegaSR RAID5
irq 26: nobody cared (try booting with the "irqpoll" option)
Pid:0, comm: swapper Tainted:P           ---------------    2.6.32-431.5.1.el6.x86_64 #1
Call Trace:
 <IRQ>  [<ffffffff810e8fdb>] ?__report_bad_irq+0x2b/0xa0
 [<ffffffff810e91dc>] ? note_interrupt+0x18c/0x1d0
 [<ffffffff810e997d>] ? handle_fasteoi_irq+0xcd/0xf0
 [<ffffffff8100faf9>] ? handle_irq+0x49/0xa0
 [<ffffffff815312ec>] ? do_IRQ+0x6c/0xf0
 [<ffffffff8100b9d3>] ? ret_from_intr+0x0/0x11
 <EOI>  [<ffffffff810ad7e6>] ? tick_nohz_stop_sched_tick+0x296/0x3c0
 [<ffffffff81009f89>] ? cpu_idle+0x79/0x110
 [<ffffffff8150cf1a>] ? rest_init+0x7a/0x80
 [<ffffffff81c26f8f>] ? start_kernel+0x424/0x430
 [<ffffffff81c2633a>] ? x86_64_start_reservations+0x125/0x129
 [<ffffffff81c26453>] ? x86_64_start_kernel+0x115/0x124
handlers:
[<ffffffffa003ccb0>] (lsraid_isr+0x0/0x70 [megasr])
Disabling IRQ #26
dracut Warning:No root device "block:/dev/mapper/vg_rhel-lv_root" found
dracut Warning:LVM vg_rhel/lv_root not found
dracut Warning:LVM vg_rhel/lv_swap not found
dracut Warning:Boot has failed.To debug this issue add "rdshell" to the kernel command line.
dracut Warning:Signal caught!
dracut Warning:LVM vg_rhel/lv_root not found
dracut Warning:LVM vg_rhel/lv_swap not found
dracut Warning:Boot has failed.To debug this issue add "rdshell" to the kernel command line.
Kernel panic - not syncing:Attempted to kill init!
Pid:1, comm: init Tainted:P           ---------------    2.6.32-431.5.1.el6.x86_64 #1
Call Trace:
 [<ffffffff81527513>] ? panic+0xa7/0x16f
 [<ffffffff81077622>] ? do_exit+0x862/0x870
 [<ffffffff8118a855>] ? fput+0x25/0x30
 [<ffffffff81077688>] ? do_group_exit+0x58/0xd0
 [<ffffffff81077717>] ? sys_exit_group+0x17/0x20
 [<ffffffff8100b072>] ? system_call_fastpath+0x16/0x1b