From mboxrd@z Thu Jan 1 00:00:00 1970 From: Philip Balister Subject: Re: Kernel oops when shutting down program using usb device Date: Wed, 16 Jul 2008 17:59:01 -0400 Message-ID: <487E6F25.3060801@balister.org> References: Mime-Version: 1.0 Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms070504070002060005090906" Return-path: Received: from mail.geekisp.com ([216.168.135.169]:38342 "EHLO starfish.geekisp.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755010AbYGPV7F (ORCPT ); Wed, 16 Jul 2008 17:59:05 -0400 In-Reply-To: Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Alan Stern Cc: linux-usb@vger.kernel.org, linux-omap@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms070504070002060005090906 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Alan Stern wrote: > On Wed, 16 Jul 2008, Philip Balister wrote: > >> The program streams data from the USRP (Universal Software Radio >> Peripheral) and calculates a transfer rate. It looks like the test >> completes and the program ooops as it is exiting. >> >> Let me know if I can collect anything else. I am not much of a usb guy :( >> >> Philip >> >> root@beagleboard:~/gnuradio-3.1.2/usrp/host/apps# >> ./test_usrp_standard_rx -D 200rx_overrun >> eth0: set allmulti >> eth0: set allmulti >> eth0: set allmulti >> eth0: set allmulti >> xfered 1.34e+08 bytes in 116 seconds. 1.159e+06 bytes/sec. cpu time = >> 1.633 >> noverruns = 1 >> ------------[ cut here ]------------ >> WARNING: at lib/kref.c:43 kref_get+0x28/0x44() > > This is just a warning, not an oops. Nevertheless, it should not > happen. > > What version of the kernel were you running? On what hardware and > using which USB host controller driver? Is the problem reproducible? Doh, silly me for leaving out details .... Beagle Board, OMAP3 based. Kernel is a fairly recent git + some patches. I can backtrack to an exact collection if necessary. I ran the test program several times and the system hangs when the program ends. I do not think I get the warning message every time though, the system does hang every time. 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