Date: Mon, 13 Oct 2008 13:47:10 -0700 From: Greg Lewis <glewis@eyesbeyond.com> To: Nikolay Denev <ndenev@gmail.com> Cc: freebsd-java@freebsd.org Subject: Re: Serious problem with RMI on jdk15 Message-ID: <20081013204710.GA52841@misty.eyesbeyond.com> In-Reply-To: <82DA0FAE-EAFF-4138-9CAA-21750A21D9D6@gmail.com> References: <EAF069E0-9DD6-41A9-93CE-1937BCA1FAFE@gmail.com> <7F26DA41-FF97-4DBB-ADAC-F7E6707B868D@gmail.com> <82DA0FAE-EAFF-4138-9CAA-21750A21D9D6@gmail.com>
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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
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