linux-kernel - Re: 2.6.26 Breaks USB Fax Modem

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Message-Id: <20080820002508.069a6a84.akpm@linux-foundation.org>
Date:	Wed, 20 Aug 2008 00:25:08 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Frank Peters <frank.peters@...cast.net>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: 2.6.26 Breaks USB Fax Modem

On Tue, 19 Aug 2008 21:10:39 -0400 Frank Peters <frank.peters@...cast.net> wrote:

> Hello,
> 
> After updating the kernel from 2.6.25 to 2.6.26, I now experience
> severe problems when trying to send a fax using an external USB
> modem.  Using either HylaFAX or efax facsimile software, the fax
> transmission will just suddenly hang at some point before completion.
> Neither the fax log or the kernel log will show any error or other
> anomaly.  Rebooting the system with kernel 2.6.25 will allow me
> to send faxes without problem.
> 
> Nothing on my machine has changed between 2.6.25 and 2.6.26 and
> the same configuration was used to compile both versions. 
> 
> The cdc-acm module is responsible for communicating with the USB
> modem and I suspect that it is at fault.
> 
> Has this problem been reported by anyone else?  How can I further
> debug this problem?  As I mentioned, no log shows any error message
> of any kind.  The logs from the fax software may indicate an
> "unspecified error" but will usually just show that the data
> stream has been abruptly halted.
> 
> Please cc to me directly since I am not subscribed to the list.
> 

(cc linux-usb)

Are any processes left hanging in `D' state afterwards?

If so, please run

	echo w > /proc/sysrq-trigger
	dmesg -s 1000000 > foo

then send foo.

Thanks.
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