usb/132080: [patch] [usb] Kernel panic after NOMEM caused by
rum card
Hans Petter Selasky
hselasky at c2i.net
Wed Feb 25 00:10:05 PST 2009
The following reply was made to PR usb/132080; it has been noted by GNATS.
From: Hans Petter Selasky <hselasky at c2i.net>
To: freebsd-usb at freebsd.org,
Andrew Thompson <andy at fud.org.nz>,
Sam Leffler <sam at freebsd.org>
Cc: Alexander Melkov <melkov at comptek.ru>,
freebsd-gnats-submit at freebsd.org
Subject: Re: usb/132080: [patch] [usb] Kernel panic after NOMEM caused by rum card
Date: Wed, 25 Feb 2009 08:10:50 +0100
Hi,
The RUM timeouts you are seeing I am aware about. They happen most likely
because the WLAN channel is set when the device is in the running state on
the RUM device due to WLAN re-keying or something like that. Maybe you can
confirm that the time from start of device with heavy download until it gets
the first timeout is 10minutes?
This issue is actually a RUM firmware issue. If it has frames pending for TX
and we set the channel, the chip will simply reset or do strange things.
Possible RUM workaround: Set the same WLAN channel only once.
I think Andrew Thompson is working on this. I have some patches in the USB P4
project for 8-current which fix the problem to a level where TX will
dissappear for 4 seconds every 10 minutes, but there will be no device
timeout! The final patch should solve the problem completely, but I need some
help to figure out when we should ignore set_channel requests.
--HPS
On Wednesday 25 February 2009, Alexander Melkov wrote:
> >Number: 132080
> >Category: usb
> >Synopsis: [patch] [usb] Kernel panic after NOMEM caused by rum card
> >Confidential: no
> >Severity: serious
> >Priority: medium
> >Responsible: freebsd-usb
> >State: open
> >Quarter:
> >Keywords:
> >Date-Required:
> >Class: sw-bug
> >Submitter-Id: current-users
> >Arrival-Date: Wed Feb 25 01:20:02 UTC 2009
> >Closed-Date:
> >Last-Modified:
> >Originator: Alexander Melkov
> >Release: 7.1-STABLE
> >Organization:
> >Environment:
>
> FreeBSD melkov.ru 7.1-STABLE FreeBSD 7.1-STABLE #14: Tue Feb 24 06:28:45
> MSK 2009 root_at_melkov.ru:/usr/obj/usr/src/sys/MELKOV amd64
>
> >Description:
>
> I have <rum> device which is Cisco-Linksys Compact Wireless-G USB Adapter
> that runs in hostap mode (i.e. wifi access point). Sometimes it
> malfunctions (that may happen several times a day), at that moment I have
> message "rum0: could not transmit buffer: NOMEM" from kernel. Right after
> the message kernel crashes upon read from (nearly) null address.
>
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