From owner-freebsd-wireless@FreeBSD.ORG Sun Dec 14 19:30:31 2014 Return-Path: Delivered-To: freebsd-wireless@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id DDBDCDAB for ; Sun, 14 Dec 2014 19:30:30 +0000 (UTC) Received: from mail-yk0-f170.google.com (mail-yk0-f170.google.com [209.85.160.170]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id A2D643C5 for ; Sun, 14 Dec 2014 19:30:30 +0000 (UTC) Received: by mail-yk0-f170.google.com with SMTP id q200so4410538ykb.15 for ; Sun, 14 Dec 2014 11:30:23 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:date:message-id:subject:from:to :content-type; bh=mLP/RbuW/q6Hxu8MHUZC4piR3kbUxcLClz2A/HZz7rw=; b=CzwVi70l7Hjk0BVd4kirbpfS+3KTvk7pTAU8SMAH3qEgC6ThRY5+Kkb6A4MK33YYVZ JVkPU1N+eWXSUXhLlQcp7/0eXLFg5XDx/Fn+6b6ranQEk2IGQbkcYDWlkR3eEvuz51mI aDYW2RpBtcr5FrnQinZ4Ilnhp+LgT/jfSn11In0hMxuvQMZJ6daTbQP8Bu9woxpd94OF uYm9vf1Yr0VrBVLQf8rSuktJas2Nd0hNFpsUWLwIF841alLppPksHM2bJ7c07R9jtQgi TtMUuk1fmhH5yWph34JAIMjvC2qaNQ+fjuGD68w9PEVfysuqy9XYYpXn92VH1gQwTUuc +1fQ== X-Gm-Message-State: ALoCoQmfvsFDzXrDVWX7L0ParIOvgs5gTKldhuaJc8zNZ52dCCjOLgqS58I9SHokq6HfxeiFh5Fy MIME-Version: 1.0 X-Received: by 10.236.105.210 with SMTP id k58mr1359643yhg.52.1418585057688; Sun, 14 Dec 2014 11:24:17 -0800 (PST) Received: by 10.170.156.197 with HTTP; Sun, 14 Dec 2014 11:24:17 -0800 (PST) Date: Sun, 14 Dec 2014 14:24:17 -0500 Message-ID: Subject: Problem with Atheros adapter (TP-LINK TL-WDN4800, AR9380) From: David Blewett To: freebsd-wireless@freebsd.org Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.18-1 X-BeenThere: freebsd-wireless@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: "Discussions of 802.11 stack, tools device driver development." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 14 Dec 2014 19:30:31 -0000 Hi All: I've been having issues with a TP-LINK TL-WDN4800 PCI Express adapter [1] that seem to have become worse since upgrading to 10.1-RELEASE. Since then, I've had a couple of kernel panics. I use the adapter in hostapd mode as my main WiFi access point. I would appreciate any help in making my setup more reliable, and am open to trying to just about anything to help troubleshoot. The problems that I see are regular disconnections from a Macbook Pro client. When this happens, sometimes the wifi icon says it is connected, but I cannot actually transmit anything to the host (i.e., pings fail). The only recourse is to turn the mbp's wifi off, then back on. This *usually* succeeds, but sometimes does not. I also have an iPad that has similar issues; turning wifi off and back on is usually sufficient to restore connectivity. This is my /etc/rc.conf: wlans_ath0="wlan0" create_args_wlan0="wlanmode hostap bssid" ifconfig_wlan0="HOSTAP ssid MiddleEarth mode 11ng channel 2" and /etc/hostapd-wlan0.conf: interface=wlan0 debug=2 ctrl_interface=/var/run/hostapd ctrl_interface_group=wheel ssid=MiddleEarth wpa=2 wpa_passphrase=xxxx wpa_key_mgmt=WPA-PSK wpa_pairwise=CCMP I see a lot of this in the logs: ath0: stuck beacon; resetting (bmiss count 8) However, from what I've read these are due to channel congestion and are to be expected. The kernel panics look like this: Fatal trap 18: integer divide fault while in kernel mode cpuid = 1; apic id = 11 instruction pointer = 0x20:0xffffffff8045161d stack pointer = 0x28:0xfffffe00e43bb760 frame pointer = 0x28:0xfffffe00e43bb7b0 code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, long 1, def32 0, gran 1 processor eflags = interrupt enabled, ath0: stuck beacon; resetting (bmiss count 8) resume, IOPL = 0 current process = 12 (swi4: clock) trap number = 18 panic: integer divide fault cpuid = 0 KDB: stack backtrace: #0 0xffffffff80963000 at kdb_backtrace+0x60 #1 0xffffffff80928125 at panic+0x155 #2 0xffffffff80d24f1f at trap_fatal+0x38f #3 0xffffffff80d24b7c at trap+0x75c #4 0xffffffff80d0a782 at calltrap+0x8 #5 0xffffffff8045b248 at ar9300_ani_poll_freebsd+0x48 #6 0xffffffff804093d6 at ath_calibrate+0xf6 #7 0xffffffff8093d557 at softclock_call_cc+0x177 #8 0xffffffff8093d994 at softclock+0x94 #9 0xffffffff808faf4b at intr_event_execute_handlers+0xab #10 0xffffffff808fb396 at ithread_loop+0x96 #11 0xffffffff808f8b6a at fork_exit+0x9a Here is the pciconf output: ath0@pci0:2:0:0: class=0x028000 card=0x3112168c chip=0x0030168c rev=0x01 hdr=0x00 vendor = 'Atheros Communications Inc.' device = 'AR9300 Wireless LAN adaptor' class = network 1. http://www.tp-link.com/lk/products/details/?model=TL-WDN4800 Thanks, David Blewett