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SubjectRe: Deadlock in kernel on USB shutdown
----- Original Message -----
From: "Greg KH" <>
To: "Roger Leblanc" <>
Cc: <>
Sent: Wednesday, January 02, 2002 9:40 AM
Subject: Re: Deadlock in kernel on USB shutdown

>> On Tue, Jan 01, 2002 at 04:48:41PM -0500, Roger Leblanc wrote:
>>> > Hi,
>>> >
>>> > I just compiled version 2.4.17 of the Linux kernel for my Pentium III.
>>> > It is compiled with modular USB support so I can run my USB scanner (an
>>> > Epson Perfection 1200U).
>>> >
>>> > The scanner works fine but the system freeses when I shut it down. I
>>> > investigated a bit and found that in the file:
>>> > <kernel_root>/drivers/usb/usb.c
>>> > in function:
>>> > usb_disconnect(struct usb_device **pdev)
>>> >
>>> > there is a call to function:
>>> > usbdevfs_remove_device(dev)
>>> > at line 2423.
>>> >
>>> > That is the exact point where it freeses. If I comment out that line,
>>> > everything goes fine. I know! This is not the proper way to fix it! But
>>> > at least, it fixes my problem. Since I'm not a kernel expert, I will
>>> > leave it to you to find the right way to fix it.
>> Does the system lock up when you unload the usbcore module by hand
>> without shutting the system down?
>> Are your init scripts unmounting the usbdevfs filesystem properly before
>> trying to unload the usbcore module?
It doesn't get that far. The first thing my init script (or Mandrake 8.1
script) does at shutdown is to run modprobe -r on modules usb-ohci,
usb-uhci and uhci. The system freeses when it gets to usb-uhci. It does
it also if I run these commands on the command line.



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