From owner-freebsd-current@freebsd.org Thu Nov 12 17:44:54 2015 Return-Path: Delivered-To: freebsd-current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id D198AA2D339 for ; Thu, 12 Nov 2015 17:44:54 +0000 (UTC) (envelope-from pete@nomadlogic.org) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id BA76C1DA0 for ; Thu, 12 Nov 2015 17:44:54 +0000 (UTC) (envelope-from pete@nomadlogic.org) Received: by mailman.ysv.freebsd.org (Postfix) id B78C0A2D338; Thu, 12 Nov 2015 17:44:54 +0000 (UTC) Delivered-To: current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B7358A2D337 for ; Thu, 12 Nov 2015 17:44:54 +0000 (UTC) (envelope-from pete@nomadlogic.org) Received: from mail.nomadlogic.org (mail.nomadlogic.org [IPv6:2607:f2f8:a098::4]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id A4B3A1D9E for ; Thu, 12 Nov 2015 17:44:54 +0000 (UTC) (envelope-from pete@nomadlogic.org) Received: from mail.nomadlogic.org (localhost [127.0.0.1]) (using TLSv1 with cipher ADH-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by mail.nomadlogic.org (Postfix) with ESMTPS id B1469125EE7 for ; Thu, 12 Nov 2015 09:44:53 -0800 (PST) Received: from pop.rubicorp.com (unknown [72.34.113.100]) (using TLSv1 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by mail.nomadlogic.org (Postfix) with ESMTPSA id A05D3125EBA for ; Thu, 12 Nov 2015 09:44:53 -0800 (PST) To: current@freebsd.org From: Pete Wright Subject: LOR in mpr(4) Message-ID: <5644D014.4080601@nomadlogic.org> Date: Thu, 12 Nov 2015 09:44:52 -0800 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Nov 2015 17:44:54 -0000 Hi All, Just wanted a sanity check before filing a PR. I am running r290688 and am seeing a LOR being triggered in the mpr(4) device: $ uname -ar FreeBSD srd0013 11.0-CURRENT FreeBSD 11.0-CURRENT #1 r290688: Wed Nov 11 21:28:26 PST 2015 root@srd0013:/usr/obj/usr/src/sys/GENERIC amd64 lock order reversal: 1st 0xfffff8000d26bc60 CAM device lock (CAM device lock) @ /usr/src/sys/cam/cam_xpt.c:784 2nd 0xfffffe00012811c0 MPR lock (MPR lock) @ /usr/src/sys/cam/cam_xpt.c:2620 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe04608ee890 witness_checkorder() at witness_checkorder+0xe79/frame 0xfffffe04608ee910 __mtx_lock_flags() at __mtx_lock_flags+0xa4/frame 0xfffffe04608ee960 xpt_action_default() at xpt_action_default+0xb6c/frame 0xfffffe04608ee9b0 scsi_scan_bus() at scsi_scan_bus+0x1d5/frame 0xfffffe04608eea20 xpt_scanner_thread() at xpt_scanner_thread+0x15c/frame 0xfffffe04608eea70 fork_exit() at fork_exit+0x84/frame 0xfffffe04608eeab0 fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe04608eeab0 --- trap 0, rip = 0, rsp = 0, rbp = 0 --- I can file a PR for this as a quick search on my end didn't return any bugs related to this. Checking here first to make sure this isn't already known/expected behavior. Thanks! -pete -- Pete Wright pete@nomadlogic.org twitter => @nomadlogicLA