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    SubjectRe: [linux-usb-devel] 2.6.19-rc5-mm1
    On Thu, 9 Nov 2006, Mattia Dongili wrote:

    > On Thu, Nov 09, 2006 at 11:04:53AM -0800, Andrew Morton wrote:
    > >
    > > (added linux-scsi)
    > [...]
    > > > [27526.232000] EIP: [<e8074e26>]
    > > > scsi_device_dev_release_usercontext+0x36/0x100 [scsi_mod] SS:ESP
    > > > 0068:dfdb1e3c
    > > >
    > > > full dmesg attached, I can test patches and provide any useful
    > > > information if needed (just not now because the dock is at work).
    > >
    > > You're the second or third person to report this (to no effect, btw).
    >
    > oh, great. I was going to report the same (had with usb key unplug).
    > Linux version 2.6.19-rc5-mm1-1 (mattia@tadamune) (gcc version 4.1.2 20060901 (prerelease) (Debian 4.1.1-13)) #4 SMP Wed Nov 8 22:46:11 CET 2006

    I don't know exactly where the problem lies, but I have narrowed it down.

    In drivers/scsi/sd.c:sd_probe(), the call to add_disk() increases the
    device's refcount by 1. However in sd_remove(), the call to del_gendisk()
    decreases the device's refcount by 2. Consequently the structure is
    deallocated too early, causing the oops.

    Somebody who knows more than I do about add_disk() and del_gendisk() will
    have to figure what's going wrong.

    Alan Stern

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