From owner-freebsd-i386@FreeBSD.ORG Thu May 30 19:40:00 2013 Return-Path: Delivered-To: freebsd-i386@smarthost.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id BDFEFE09 for ; Thu, 30 May 2013 19:40:00 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:1900:2254:206c::16:87]) by mx1.freebsd.org (Postfix) with ESMTP id 8A7B2E4 for ; Thu, 30 May 2013 19:40:00 +0000 (UTC) Received: from freefall.freebsd.org (localhost [127.0.0.1]) by freefall.freebsd.org (8.14.7/8.14.7) with ESMTP id r4UJe0Bq039389 for ; Thu, 30 May 2013 19:40:00 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.14.7/8.14.7/Submit) id r4UJe0YX039388; Thu, 30 May 2013 19:40:00 GMT (envelope-from gnats) Resent-Date: Thu, 30 May 2013 19:40:00 GMT Resent-Message-Id: <201305301940.r4UJe0YX039388@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-i386@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, "Majdi S. Abbas" Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 58B6DA69 for ; Thu, 30 May 2013 19:30:41 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from oldred.FreeBSD.org (oldred.freebsd.org [8.8.178.121]) by mx1.freebsd.org (Postfix) with ESMTP id 4B47FFD4 for ; Thu, 30 May 2013 19:30:41 +0000 (UTC) Received: from oldred.FreeBSD.org ([127.0.1.6]) by oldred.FreeBSD.org (8.14.5/8.14.5) with ESMTP id r4UJUfss092042 for ; Thu, 30 May 2013 19:30:41 GMT (envelope-from nobody@oldred.FreeBSD.org) Received: (from nobody@localhost) by oldred.FreeBSD.org (8.14.5/8.14.5/Submit) id r4UJUfak092030; Thu, 30 May 2013 19:30:41 GMT (envelope-from nobody) Message-Id: <201305301930.r4UJUfak092030@oldred.FreeBSD.org> Date: Thu, 30 May 2013 19:30:41 GMT From: "Majdi S. Abbas" To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-3.1 Subject: i386/179115: Writing to uart1 causes host to hang X-BeenThere: freebsd-i386@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: I386-specific issues for FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 30 May 2013 19:40:00 -0000 >Number: 179115 >Category: i386 >Synopsis: Writing to uart1 causes host to hang >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-i386 >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Thu May 30 19:40:00 UTC 2013 >Closed-Date: >Last-Modified: >Originator: Majdi S. Abbas >Release: 9.1-RELEASE >Organization: Lattice, L.L.C. >Environment: root@procyon:/dev # uname -a FreeBSD procyon.latt.net 9.1-RELEASE FreeBSD 9.1-RELEASE #2: Wed May 29 16:01:42 UTC 2013 msa@procyon.latt.net:/usr/src/sys/i386/compile/NET4801 i386 root@procyon:/dev # dmesg | grep uart uart0: <16550 or compatible> at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0 uart0: console (9600,n,8,1) uart1: <16550 or compatible> at port 0x2f8-0x2ff irq 3 on isa0 uart0: <16550 or compatible> at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0 uart0: console (9600,n,8,1) uart1: <16550 or compatible> at port 0x2f8-0x2ff irq 3 on isa0 >Description: Opening /dev/cuau1 works successfully; incoming data arrives and is read just fine. stty verifies parameters normally, and this is a standard serial port on real hardware (no USB or anything else involved here.) Any attempt to write to /dev/cuau1 while open causes the system to hang; it returns ping and completes 3 way handshakes but is unresponsive via ssh and on console. Same cabling, same configuration works on another OS. Levels have been verified with a digital volt meter, and RS232 analyzer. >How-To-Repeat: 100% repeatable with either my build or GENERIC from boottime. >Fix: >Release-Note: >Audit-Trail: >Unformatted: