From owner-freebsd-java@FreeBSD.ORG Mon Oct 13 20:45:37 2008 Return-Path: Delivered-To: freebsd-java@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 565FD1065689 for ; Mon, 13 Oct 2008 20:45:37 +0000 (UTC) (envelope-from glewis@eyesbeyond.com) Received: from misty.eyesbeyond.com (gerbercreations.com [71.39.140.16]) by mx1.freebsd.org (Postfix) with ESMTP id EEA6B8FC1B for ; Mon, 13 Oct 2008 20:45:36 +0000 (UTC) (envelope-from glewis@eyesbeyond.com) Received: from misty.eyesbeyond.com (localhost.eyesbeyond.com [127.0.0.1]) by misty.eyesbeyond.com (8.14.2/8.14.2) with ESMTP id m9DKlBsv052948; Mon, 13 Oct 2008 13:47:11 -0700 (PDT) (envelope-from glewis@eyesbeyond.com) Received: (from glewis@localhost) by misty.eyesbeyond.com (8.14.2/8.14.2/Submit) id m9DKlA0U052947; Mon, 13 Oct 2008 13:47:10 -0700 (PDT) (envelope-from glewis@eyesbeyond.com) X-Authentication-Warning: misty.eyesbeyond.com: glewis set sender to glewis@eyesbeyond.com using -f Date: Mon, 13 Oct 2008 13:47:10 -0700 From: Greg Lewis To: Nikolay Denev Message-ID: <20081013204710.GA52841@misty.eyesbeyond.com> References: <7F26DA41-FF97-4DBB-ADAC-F7E6707B868D@gmail.com> <82DA0FAE-EAFF-4138-9CAA-21750A21D9D6@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <82DA0FAE-EAFF-4138-9CAA-21750A21D9D6@gmail.com> User-Agent: Mutt/1.5.18 (2008-05-17) Cc: freebsd-java@freebsd.org Subject: Re: Serious problem with RMI on jdk15 X-BeenThere: freebsd-java@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Porting Java to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 13 Oct 2008 20:45:37 -0000 On Mon, Oct 13, 2008 at 05:58:58PM +0300, Nikolay Denev wrote: > On Oct 13, 2008, at 5:47 PM, Nikolay Denev wrote: > > On Oct 9, 2008, at 4:35 PM, Nikolay Denev wrote: > > > >> Hi All, > >> > >> I have the following problem : when I connect to a jmxremote > >> enabled application with jconsole the whole VM crashes with > >> segmentation fault. > >> > > [...snip...] > >> > >> I'm running amd64 7.1-PRE from yesterday, and the jdk is > >> jdk-1.5.0.14p8_3,1 > >> > >> Any help is greatly appreciated! > >> > >> Thanks, > >> Nikolay Denev > > > > I think I've tracked down the problem. > > The JVM crashes when one requests the TotalPhysicalMemory from the > > OperatingSystem bean. > > The strange thing is that Sun specifies this value as "long", but > > how this can work on 64bit machines with many gigabytes of memory? > > > > What BSD patchset does is read the hw.physmem sysctl, which returns > > unsigned long, and then cast it to jlong and probably this is where > > the problem is. > > I've tried disabling the sysctl and hardcoding the result and my JVM > > does not crash anymore. > > Jconsole still does not show anything though.... and the same test > > program produces info when used with the diablo-jdk15... > > > > > > Regards, > > Nikolay Denev > > As I read this now, It's not exactly correct, longs should be 4 bytes > on 32bit archs, and 8bytes on 64bit archs. > So the storage type for TotalPhysicalMemory should be ok. Maybe jlong > is not correctly adjusted to 8bytes on 64bit architectures? A jlong is typedef'ed as a 'long long' on both 32 and 64 bit architectures. How much memory does the machine have and what architecture is it? -- Greg Lewis Email : glewis@eyesbeyond.com Eyes Beyond Web : http://www.eyesbeyond.com Information Technology FreeBSD : glewis@FreeBSD.org