Hello,
 for some odd reason my usb mouse started to die on me. completely.
It's a regular cheap mouse with 2 buttons with no fancy functionality.
The sequence of events:
 the fan on processor starts spinning louder than usual and next thing
mouse stops responding. Keyboard ( also usb) continues to work at the
same time.
If i unplug and plug it ( mouse) back - even the diode goes off and
doesn't come back.

So i think that usb system is crashing. and i jsut need to reload the
module. Well, first i don't see any uhci etc modules loaded in a
freshly booted system. Second, after the crash when i try to reload
the usbcore module i can't:
[root@server boot]# lsmod | grep usb
usblp                  10058  0
[root@server boot]# modprobe usbcore
WARNING: All config files need .conf:
/etc/modprobe.d/blacklist.conf00, it will be ignored in a future
release.
FATAL: Module usbcore not found.
[root@server boot]#  uname -a
Linux server.home 2.6.32-131.2.1.el6.i686 #1 SMP Thu Jun 2 10:08:29
CDT 2011 i686 i686 i386 GNU/Linux
it's a stock installation - i didn't make any changes to kernel.

I looked at the config-2.6.32-131.2.1.el6.i686 and came across:
#
# USB Input Devices
#
CONFIG_USB_HID=y
CONFIG_HID_PID=y
CONFIG_USB_HIDDEV=y

Is my understanding correct that the usb modules (ehci, uhci etc) are
compiled into the module and that is the reason why i can't reload
them?

Any ideas on the issue are very welcome, because all i can do to get
mouse back is to reboot.
Here is the last 100 lines from messages. Last line - is my rmmod usbcore:
Jun 20 18:52:50 server kernel: INFO: task khubd:23 blocked for more
than 120 seconds.
Jun 20 18:52:50 server kernel: "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jun 20 18:52:50 server kernel: khubd         D ffffffff     0    23
  2 0x00000000
Jun 20 18:52:50 server kernel: f7121570 00000046 00000000 ffffffff
0000000a 00000000 00000000 000022f5
Jun 20 18:52:50 server kernel: 00000000 c14f9740 0000a235 2cc4485f
0000a235 c0ae0120 c0ae0120 f7121818
Jun 20 18:52:50 server kernel: c0ae0120 c0adbb54 c0ae0120 f7121818
c165e000 00000000 0a9bf6c9 f54da900
Jun 20 18:52:50 server kernel: Call Trace:
Jun 20 18:52:50 server kernel: [<c071b8a0>] ? ohci_urb_dequeue+0x60/0xe0
Jun 20 18:52:50 server kernel: [<c06fda7e>] ? unlink1+0x2e/0xe0
Jun 20 18:52:50 server kernel: [<c05f131f>] ? kobject_get+0xf/0x20
Jun 20 18:52:50 server kernel: [<c06fdd33>] ? usb_hcd_unlink_urb+0x53/0xf0
Jun 20 18:52:50 server kernel: [<c0473f6b>] ? prepare_to_wait+0x5b/0x60
Jun 20 18:52:50 server kernel: [<c06ff5b5>] ? usb_kill_urb+0x65/0xa0
Jun 20 18:52:50 server kernel: [<c0473cb0>] ? autoremove_wake_function+0x0/0x40
Jun 20 18:52:50 server kernel: [<c06fdbde>] ? usb_hcd_flush_endpoint+0xae/0x1b0
Jun 20 18:52:50 server kernel: [<c071b6b8>] ? ohci_endpoint_disable+0xa8/0x230
Jun 20 18:52:50 server kernel: [<c0700094>] ? usb_disable_endpoint+0x44/0x90
Jun 20 18:52:50 server kernel: [<c0700123>] ? usb_disable_device+0x43/0x1d0
Jun 20 18:52:50 server kernel: [<c0700f8c>] ? usb_control_msg+0xec/0x150
Jun 20 18:52:50 server kernel: [<c06f8b1f>] ? usb_disconnect+0xbf/0x1c0
Jun 20 18:52:50 server kernel: [<c06fa004>] ? hub_thread+0x674/0x1700
Jun 20 18:52:50 server kernel: [<c0408367>] ? __switch_to+0xd7/0x1a0
Jun 20 18:52:50 server kernel: [<c044ba5a>] ? try_to_wake_up+0x9a/0x3b0
Jun 20 18:52:50 server kernel: [<c0473cb0>] ? autoremove_wake_function+0x0/0x40
Jun 20 18:52:50 server kernel: [<c06f9990>] ? hub_thread+0x0/0x1700
Jun 20 18:52:50 server kernel: [<c06f9990>] ? hub_thread+0x0/0x1700
Jun 20 18:52:50 server kernel: [<c0473a74>] ? kthread+0x74/0x80
Jun 20 18:52:50 server kernel: [<c0473a00>] ? kthread+0x0/0x80
Jun 20 18:52:50 server kernel: [<c040a03f>] ? kernel_thread_helper+0x7/0x10
Jun 20 18:54:50 server kernel: INFO: task khubd:23 blocked for more
than 120 seconds.
Jun 20 18:54:50 server kernel: "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jun 20 18:54:50 server kernel: khubd         D ffffffff     0    23
  2 0x00000000
Jun 20 18:54:50 server kernel: f7121570 00000046 00000000 ffffffff
0000000a 00000000 00000000 000022f5
Jun 20 18:54:50 server kernel: 00000000 c14f9740 0000a235 2cc4485f
0000a235 c0ae0120 c0ae0120 f7121818
Jun 20 18:54:50 server kernel: c0ae0120 c0adbb54 c0ae0120 f7121818
c165e000 00000000 0a9bf6c9 f54da900
Jun 20 18:54:50 server kernel: Call Trace:
Jun 20 18:54:50 server kernel: [<c071b8a0>] ? ohci_urb_dequeue+0x60/0xe0
Jun 20 18:54:50 server kernel: [<c06fda7e>] ? unlink1+0x2e/0xe0
Jun 20 18:54:50 server kernel: [<c05f131f>] ? kobject_get+0xf/0x20
Jun 20 18:54:50 server kernel: [<c06fdd33>] ? usb_hcd_unlink_urb+0x53/0xf0
Jun 20 18:54:50 server kernel: [<c0473f6b>] ? prepare_to_wait+0x5b/0x60
Jun 20 18:54:50 server kernel: [<c06ff5b5>] ? usb_kill_urb+0x65/0xa0
Jun 20 18:54:50 server kernel: [<c0473cb0>] ? autoremove_wake_function+0x0/0x40
Jun 20 18:54:50 server kernel: [<c06fdbde>] ? usb_hcd_flush_endpoint+0xae/0x1b0
Jun 20 18:54:50 server kernel: [<c071b6b8>] ? ohci_endpoint_disable+0xa8/0x230
Jun 20 18:54:50 server kernel: [<c0700094>] ? usb_disable_endpoint+0x44/0x90
Jun 20 18:54:50 server kernel: [<c0700123>] ? usb_disable_device+0x43/0x1d0
Jun 20 18:54:50 server kernel: [<c0700f8c>] ? usb_control_msg+0xec/0x150
Jun 20 18:54:50 server kernel: [<c06f8b1f>] ? usb_disconnect+0xbf/0x1c0
Jun 20 18:54:50 server kernel: [<c06fa004>] ? hub_thread+0x674/0x1700
Jun 20 18:54:50 server kernel: [<c0408367>] ? __switch_to+0xd7/0x1a0
Jun 20 18:54:50 server kernel: [<c044ba5a>] ? try_to_wake_up+0x9a/0x3b0
Jun 20 18:54:50 server kernel: [<c0473cb0>] ? autoremove_wake_function+0x0/0x40
Jun 20 18:54:50 server kernel: [<c06f9990>] ? hub_thread+0x0/0x1700
Jun 20 18:54:50 server kernel: [<c06f9990>] ? hub_thread+0x0/0x1700
Jun 20 18:54:50 server kernel: [<c0473a74>] ? kthread+0x74/0x80
Jun 20 18:54:50 server kernel: [<c0473a00>] ? kthread+0x0/0x80
Jun 20 18:54:50 server kernel: [<c040a03f>] ? kernel_thread_helper+0x7/0x10
Jun 20 18:56:50 server kernel: INFO: task khubd:23 blocked for more
than 120 seconds.
Jun 20 18:56:50 server kernel: "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jun 20 18:56:50 server kernel: khubd         D ffffffff     0    23
  2 0x00000000
Jun 20 18:56:50 server kernel: f7121570 00000046 00000000 ffffffff
0000000a 00000000 00000000 000022f5
Jun 20 18:56:50 server kernel: 00000000 c14f9740 0000a235 2cc4485f
0000a235 c0ae0120 c0ae0120 f7121818
Jun 20 18:56:50 server kernel: c0ae0120 c0adbb54 c0ae0120 f7121818
c165e000 00000000 0a9bf6c9 f54da900
Jun 20 18:56:50 server kernel: Call Trace:
Jun 20 18:56:50 server kernel: [<c071b8a0>] ? ohci_urb_dequeue+0x60/0xe0
Jun 20 18:56:50 server kernel: [<c06fda7e>] ? unlink1+0x2e/0xe0
Jun 20 18:56:50 server kernel: [<c05f131f>] ? kobject_get+0xf/0x20
Jun 20 18:56:50 server kernel: [<c06fdd33>] ? usb_hcd_unlink_urb+0x53/0xf0
Jun 20 18:56:50 server kernel: [<c0473f6b>] ? prepare_to_wait+0x5b/0x60
Jun 20 18:56:50 server kernel: [<c06ff5b5>] ? usb_kill_urb+0x65/0xa0
Jun 20 18:56:50 server kernel: [<c0473cb0>] ? autoremove_wake_function+0x0/0x40
Jun 20 18:56:50 server kernel: [<c06fdbde>] ? usb_hcd_flush_endpoint+0xae/0x1b0
Jun 20 18:56:50 server kernel: [<c071b6b8>] ? ohci_endpoint_disable+0xa8/0x230
Jun 20 18:56:50 server kernel: [<c0700094>] ? usb_disable_endpoint+0x44/0x90
Jun 20 18:56:50 server kernel: [<c0700123>] ? usb_disable_device+0x43/0x1d0
Jun 20 18:56:50 server kernel: [<c0700f8c>] ? usb_control_msg+0xec/0x150
Jun 20 18:56:50 server kernel: [<c06f8b1f>] ? usb_disconnect+0xbf/0x1c0
Jun 20 18:56:50 server kernel: [<c06fa004>] ? hub_thread+0x674/0x1700
Jun 20 18:56:50 server kernel: [<c0408367>] ? __switch_to+0xd7/0x1a0
Jun 20 18:56:50 server kernel: [<c044ba5a>] ? try_to_wake_up+0x9a/0x3b0
Jun 20 18:56:50 server kernel: [<c0473cb0>] ? autoremove_wake_function+0x0/0x40
Jun 20 18:56:50 server kernel: [<c06f9990>] ? hub_thread+0x0/0x1700
Jun 20 18:56:50 server kernel: [<c06f9990>] ? hub_thread+0x0/0x1700
Jun 20 18:56:50 server kernel: [<c0473a74>] ? kthread+0x74/0x80
Jun 20 18:56:50 server kernel: [<c0473a00>] ? kthread+0x0/0x80
Jun 20 18:56:50 server kernel: [<c040a03f>] ? kernel_thread_helper+0x7/0x10
Jun 20 20:33:58 server ntpd[2099]: synchronized to 67.159.5.90, stratum 2
Jun 20 23:24:33 server ntpd[2099]: synchronized to 68.68.18.78, stratum 2
Jun 20 23:29:01 server kernel: usbcore: deregistering interface driver
usb-storage

Thank you.
Andrew