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    SubjectRe: [linux-usb-devel] 2.6: USB Storage hangs machine on bootup for ~2 minutes
    On Tue, 22 Feb 2005, Parag Warudkar wrote:

    > > You said that the system hangs during bootup.  Where in the log does that
    > > hang occur?  The log itself looks perfectly normal.  The Maxtor drive is
    > > scanned, the partitions detected, and then apparently one or two
    > > partitions are mounted.  There's no indication of any problem.
    >
    > I have tracked down the reason for this hang - it seems that kudzu gets stuck
    > in D state on usb_device_read - Below SysRQ+T from 2.6.11-rc4 - always
    > reproducible.
    >
    > kudzu D 00000000ffffffff 0 4424 4472
    > (NOTLB)
    > ffff81002bebfd98 0000000000000086 ffff81002c538150 ffff81002f21d00e
    > 000000078847ce40 ffff81002b5977c0 000000000000fd38 ffffffff803defc0
    > ffff81002bebfd88 ffffffff80219b32
    > Call Trace:
    > <ffffffff80219b32>{_atomic_dec_and_lock+290} <ffffffff80383835>{__down+421}
    > <ffffffff80133e30>{default_wake_function+0}
    > <ffffffff803868ae>{__down_failed+53}
    > <ffffffff802db9f1>{.text.lock.usb+5}
    > <ffffffff802edb35>{usb_device_read+229}
    > <ffffffff801998d1>{vfs_read+225} <ffffffff80199bd0>{sys_read+80}
    > <ffffffff8010ed1e>{system_call+126}
    >
    > Thereafter, if I try to mount the USB drive, even mount gets stuck.

    usb_device_read acquires a couple of locks, one for the USB bus list and
    one for the root hub of the bus it's looking at. I don't know which one
    occurs at offset 229 on your system -- maybe you can tell. Oddly enough,
    neither of those locks is for a USB device like the Maxtor drive. So it's
    not at all clear why plugging in the drive should mess up kudzu. Or why
    the blockage should clear up after a couple of minutes.

    Perhaps we can find out by looking at other entries in the stack trace.
    Of particular interest are the khubd, usb-storage, and scsi_eh processes.

    Alan Stern

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