Description of problem:

Installed today F9 in parallel on my x86 Dell Latitude C640 and my nephew's
x86_64 desktop; my laptop hung at install time for over 15 minutes with nash
--forcequiet in D state (then it eventually completed), while the desktop
completed installation without any issues.

Later on, while running 'yum update' from the command line on the desktop, the
2.6.25.3-18 kernel update hung for a similar amount of time, again with nash
--forcequiet in D state, before completing.

Version-Release number of selected component (if applicable):

filed under mkinitrd as I've seen other bugs filed this way; which is then F9's
base mkinitrd.

How reproducible:

twice on three attempts to install a kernel so far :)

Steps to Reproduce:
1. rpm -i <new_kernel_rpm>
2.
3.
  
Actual results:

prompt stays there for minutes, nash in D state

Expected results:

action happens right away

Additional info:

I took a ps output of the yum update hang, and /var/log/messages has a trace of
me echoing "t" in /proc/sysrq-trigger.

The SATA timeout messages, as I wrote in this LKML message

http://www.ussg.iu.edu/hypermail/linux/kernel/0805.2/0735.html

 minutes ago, go away when booting the kernel with "noapic".

Excerpts:

 4638 pts/2    S+     0:00 /bin/bash --norc /sbin/mkinitrd --allow-missing -f
/boot/initrd-2.6.25.3-18.fc9.x86_64.img 2.6.25.3-18.fc9.x86_64
 4639 pts/2    S+     0:00 /bin/bash --norc /sbin/mkinitrd --allow-missing -f
/boot/initrd-2.6.25.3-18.fc9.x86_64.img 2.6.25.3-18.fc9.x86_64
 4641 pts/2    D+     0:00 /sbin/nash --forcequiet


May 17 17:53:04 rospo kernel: nash          D 0000000000000002     0  4641   4639
May 17 17:53:04 rospo kernel:  ffff81000862d838 0000000000000082
ffff8100054bd640 ffff810005504000
May 17 17:53:04 rospo kernel:  ffff81000862d7b8 ffffffff814ba780
ffffffff814ba780 0000000000000246
May 17 17:53:04 rospo kernel:  ffff810005504000 ffff810006d88000
ffff810002e70000 ffff810006d88358
May 17 17:53:04 rospo kernel: Call Trace:
May 17 17:53:04 rospo kernel:  [schedule_timeout+34/180] schedule_timeout+0x22/0xb4
May 17 17:53:04 rospo kernel:  [kobject_put+25/27] ? kobject_put+0x19/0x1b
May 17 17:53:04 rospo kernel:  [put_device+21/23] ? put_device+0x15/0x17
May 17 17:53:04 rospo kernel:  [_end+112168489/2114593988] ?
:scsi_mod:scsi_request_fn+0x381/0x3d3
May 17 17:53:04 rospo kernel:  [wait_for_common+242/311] wait_for_common+0xf2/0x137
May 17 17:53:04 rospo kernel:  [default_wake_function+0/15] ?
default_wake_function+0x0/0xf
May 17 17:53:04 rospo kernel:  [__generic_unplug_device+36/40] ?
__generic_unplug_device+0x24/0x28
May 17 17:53:04 rospo kernel:  [wait_for_completion+24/26]
wait_for_completion+0x18/0x1a
May 17 17:53:04 rospo kernel:  [blk_execute_rq+146/174] blk_execute_rq+0x92/0xae
May 17 17:53:04 rospo kernel:  [bio_phys_segments+23/32] ?
bio_phys_segments+0x17/0x20
May 17 17:53:04 rospo kernel:  [_end+112173292/2114593988]
:scsi_mod:scsi_execute+0xd9/0xfa
May 17 17:53:04 rospo kernel:  [_end+114075374/2114593988]
:sr_mod:sr_do_ioctl+0xb0/0x1df
May 17 17:53:04 rospo kernel:  [_end+114071250/2114593988]
:sr_mod:sr_packet+0x25/0x2c
May 17 17:53:04 rospo kernel:  [_end+114040971/2114593988]
:cdrom:cdrom_get_media_event+0x51/0x85
May 17 17:53:04 rospo kernel:  [_end+114075096/2114593988]
:sr_mod:sr_drive_status+0x3a/0x83
May 17 17:53:04 rospo kernel:  [_end+114041174/2114593988]
:cdrom:cdrom_open+0x97/0x925
May 17 17:53:04 rospo kernel:  [__switch_to+747/763] ? __switch_to+0x2eb/0x2fb
May 17 17:53:04 rospo kernel:  [__reacquire_kernel_lock+58/90] ?
__reacquire_kernel_lock+0x3a/0x5a
May 17 17:53:04 rospo kernel:  [thread_return+119/167] ? thread_return+0x77/0xa7
May 17 17:53:04 rospo kernel:  [kobject_get+26/34] ? kobject_get+0x1a/0x22
May 17 17:53:04 rospo kernel:  [_end+114072539/2114593988]
:sr_mod:sr_block_open+0x8f/0xa8
May 17 17:53:04 rospo kernel:  [do_open+510/714] do_open+0x1fe/0x2ca
May 17 17:53:04 rospo kernel:  [blkdev_open+0/103] ? blkdev_open+0x0/0x67
May 17 17:53:04 rospo kernel:  [blkdev_open+54/103] blkdev_open+0x36/0x67
May 17 17:53:04 rospo kernel:  [__dentry_open+245/456] __dentry_open+0xf5/0x1c8
May 17 17:53:04 rospo kernel:  [nameidata_to_filp+46/63] nameidata_to_filp+0x2e/0x3f
May 17 17:53:04 rospo kernel:  [do_filp_open+57/75] do_filp_open+0x39/0x4b
May 17 17:53:04 rospo kernel:  [__strncpy_from_user+44/83] ?
__strncpy_from_user+0x2c/0x53
May 17 17:53:04 rospo kernel:  [get_unused_fd_flags+139/287] ?
get_unused_fd_flags+0x8b/0x11f
May 17 17:53:04 rospo kernel:  [do_sys_open+81/210] do_sys_open+0x51/0xd2
May 17 17:53:04 rospo kernel:  [sys_open+27/29] sys_open+0x1b/0x1d
May 17 17:53:04 rospo kernel:  [tracesys+213/218] tracesys+0xd5/0xda