linux-kernel - Re: USB misbehavior causes system hang

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Date:	Tue, 27 Feb 2007 15:15:58 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	ebuddington@...leyan.edu
Cc:	linux-kernel@...r.kernel.org
Subject: Re: USB misbehavior causes system hang

Am Dienstag, 27. Februar 2007 15:06 schrieb Eric Buddington:

Exactly this portion of the log would hold the reason for the reset.
 
> usb 1-6.2: reset high speed USB device using ehci_hcd and address 36
> usb 1-6.2: device descriptor read/64, error -110
> usb 1-6.2: device descriptor read/64, error -110
[..]
> end_request: I/O error, dev sda, sector 919931828
> sd 1:0:0:0: rejecting I/O to offline device
> sd 1:0:0:0: rejecting I/O to offline device
> sd 1:0:0:0: rejecting I/O to offline device

By that point USB is no longer involved. These requests error out
in the SCSI layer.

> My softdog script loops 'date >/tmp/$logfile;echo 1 > /dev/watchdog; sleep
> 30'. Nothing in it accesses the USB disk. /tmp is tmpfs.

If you've written to the USB disk a lot, you are likely to cause writes
to it as soon as you are under memory pressure.
 
> Should the USB failure cause this problem?

No.

	Regards
		Oliver
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