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From: Parag Warudkar <kernel-stuff@comcast.net>
To: Alan Stern <stern@rowland.harvard.edu>
Subject: Re: [linux-usb-devel] 2.6: USB Storage hangs machine on bootup for ~2 minutes
Date: Tue, 22 Feb 2005 13:44:58 -0500
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On Monday 07 February 2005 11:18 am, Alan Stern wrote:
> > I am already running 2.6.11-rc3 and the problem has not gone away. Are
> > there any relevant fixes in -bk?
>
> No.
>
> > Attached is the bootup log after enabling CONFIG_USB_STORAGE_DEBUG.
>
> 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.

Parag
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