Rob Shepherd wrote:
Dear Xen-users at Xen Discuss,
I started this thread on [email protected]
but would like to carry on the discussion here. (as it's a 9.06 based
platform)
Original discussion (I'll only repeat the main bits)
http://lists.xensource.com/archives/html/xen-users/2009-11/msg00338.html
My Setup:
very recent quad core Xeon 2Ghz,
Xen 3.1 from OpenSolaris 09/06
OpenSolaris 09/06 Dom0
Ubuntu 8.04 with 2.6.24-25-xen kernel image OR debian 2.6.26-2-xen-amd64
kernel
JVMs: ANY (1.5.0 - 1.7, either openjdk or sun)
My Problem:
ubuntu (8.04) / Debian (5) hosts cannot run a JBoss instance when the
virtual machine is configured with more than 1791MB of memory.
Symptoms:
JVM Seg fault.
Current thread (0x000000000061e800): GCTaskThread [stack:
0x0000000041166000,0x0000000041267000] [id=7238]
siginfo:si_signo=SIGSEGV: si_errno=0, si_code=1 (SEGV_MAPERR),
si_addr=0x0000000000000018
Notes: If I set the RAM to 1791 it's as stable as normal, if I set the
RAM to 1792 or above, the JVM segfaults within 10secs.
If I use an HVM vm, it works fine.
Any pointers/input or help with this would be greatly appreciated.
A great many thanks
Rob
Some more info, this taken on a PV VM system (above) 1792MB memory.
By adding -XX:+PrintGCDetails I can confirm that garbage collection is
the crash trigger.
A snippet from the JBoss startup log. We can see (in this instance) the
"Full GC" never completes.... (it's not always Full GCs)
12:38:13,791 INFO [ServerInfo] Java version: 1.6.0_0,Sun Microsystems Inc.
12:38:13,791 INFO [ServerInfo] Java Runtime: OpenJDK Runtime Environment
(build 1.6.0_0-b16)
12:38:13,791 INFO [ServerInfo] Java VM: OpenJDK 64-Bit Server VM 14.0-b16,Sun
Microsystems Inc.
12:38:13,791 INFO [ServerInfo] OS-System: Linux 2.6.26-2-xen-amd64,amd64
12:38:13,792 INFO [ServerInfo] VM arguments: -Dprogram.name=run.sh -Xms512m -Xmx512m -XX:MaxPermSize=256m -Dorg.jboss.resolver.warning=true -XX:+PrintGCDetails -Djava.net.preferIPv4Stack=true -Djava.endorsed.dirs=/usr/local/jboss-5.1.0.GA/lib/endorsed
12:38:13,823 INFO [JMXKernel] Legacy JMX core initialized
[GC [PSYoungGen: 131072K->16975K(152896K)] 131072K->16975K(502464K), 0.0590160 secs] [Times: user=0.06 sys=0.03, real=0.06 secs]
[GC [PSYoungGen: 148047K->20094K(152896K)] 148047K->20094K(502464K), 0.1033480 secs] [Times: user=0.07 sys=0.03, real=0.11 secs]
12:38:15,607 INFO [ProfileServiceBootstrap] Loading profile: profile...@30f49e8f[domain=default, server=default, name=default]
[GC [PSYoungGen: 151166K->21817K(152896K)] 151166K->43690K(502464K), 0.1092050 secs] [Times: user=0.13 sys=0.03, real=0.11 secs]
12:38:16,984 INFO [WebService] Using RMI server codebase: http://127.0.0.1:8083/
[GC [PSYoungGen: 53080K->21796K(152896K)] 74952K->48044K(502464K), 0.0478300 secs] [Times: user=0.08 sys=0.01, real=0.04 secs]
[Full GC (System)#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007f9d6fb96b30, pid=5681, tid=1091848528
#
# JRE version: 6.0-b16
Again, any insight into this, and any thoughts on solving this would be
appreciated.
A great many thanks
Rob
--
Rob Shepherd BEng PhD - Director / Senior Engineer - DataCymru Ltd
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