2.6.2 hangs with usb flashdisk plugged

[Isaac Claymore]

Hi folks,

Every time I plug my usb flashdisk (not sure what you native speakers
call it, it's a key-sized 128M usb storage device) into the system, the
kernel hangs immediately with no panic message, after spitting a few
lines like this:

hub 1-0:1.0 over-current change on port 4
hub 1-0:1.0 over-current change on port 6
hub 1-0:1.0 over-current change on port 4
hub 1-0:1.0 over-current change on port 6

It's absolutely reproduceable on 2.6.2, and here's some context info:

clay kapok:~ [1028]% uname -a
Linux kapok 2.6.2 #1 Thu Feb 12 13:59:28 CST 2004 i686 GNU/Linux

clay kapok:~ [1030]% lspci -v
00:1d.0 USB Controller: Intel Corp. 82801DB USB (Hub #1) (rev 02) (prog-if 00 [UHCI])
        Subsystem: Intel Corp.: Unknown device 5247
	Flags: bus master, medium devsel, latency 0, IRQ 16
	I/O ports at e800 [size=32]

00:1d.1 USB Controller: Intel Corp. 82801DB USB (Hub #2) (rev 02) (prog-if 00 [UHCI])
        Subsystem: Intel Corp.: Unknown device 5247
	Flags: bus master, medium devsel, latency 0, IRQ 19
        I/O ports at e880 [size=32]

00:1d.2 USB Controller: Intel Corp. 82801DB USB (Hub #3) (rev 02) (prog-if 00 [UHCI])
        Subsystem: Intel Corp.: Unknown device 5247
	Flags: bus master, medium devsel, latency 0, IRQ 18
        I/O ports at ec00 [size=32]

00:1d.7 USB Controller: Intel Corp. 82801DB USB2 (rev 02) (prog-if 20 [EHCI])
        Subsystem: Intel Corp.: Unknown device 5247
        Flags: bus master, medium devsel, latency 0, IRQ 23
        Memory at ffa7fc00 (32-bit, non-prefetchable) [size=1K]
        Capabilities: <available only to root>

kapok:~ [10]# modprobe usbcore
drivers/usb/core/usb.c: registered new driver hub

kapok:~ [10]# modprobe ehci-hcd
ehci_hcd 0000:00:1d.7: EHCI Host Controller
PCI: Setting latency timer of device 0000:00:1d.7 to 64
ehci_hcd 0000:00:1d.7: irq 23, pci mem d027fc00
ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 1
PCI: cache line size of 128 is not supported by device 0000:00:1d.7
ehci_hcd 0000:00:1d.7: USB 2.0 enabled, EHCI 1.00, driver 2003-Dec-29
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 6 ports detected
hub 1-0:1.0: over-current change on port 4
hub 1-0:1.0: over-current change on port 6


To this point, everything goes just fine. But, whenever I plug in my usb
flashdisk, the system completely freezes, and nothing responses but the
poweroff button.

I'm using a vanilla 2.6.2.

If additional information is needed to diagnose it, plz let me known.

-- 

Regards, Isaac
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