I have made JavaFx application which is running fine in Window , Mac OS but when i run in Linux Fedora the application make crash the whole system with the following log.
1) What is the reason of crash in Linux ?
2) What may the be the possible solution of this crash?
A fatal error has been detected by the Java Runtime Environment:
SIGSEGV (0xb) at pc=0x00840e58, pid=2114, tid=2694839152 JRE version:
Java(TM) SE Runtime Environment (7.0_51-b13) (build 1.7.0_51-b13)
Java VM: Java HotSpot(TM) Client VM (24.51-b03 mixed mode linux-x86 )
Problematic frame: C [libc.so.6+0x2fe58] exit+0x38 Failed to write
core dump. Core dumps have been disabled. To enable core dumping, try
"ulimit -c unlimited" before starting Java again If you would like to
submit a bug report, please visit:
http://bugreport.sun.com/bugreport/crash.jsp The crash happened
outside the Java Virtual Machine in native code. See problematic
frame for where to report the bug.
--------------- T H R E A D ---------------
Current thread (0xa0a8d800): JavaThread "JNativeHook Native Hook"
[_thread_in_native, id=2306, stack(0xa01ff000,0xa0a00000)]
--------------- S Y S T E M ---------------
OS:Fedora release 14 (Laughlin)
uname:Linux 2.6.35.6-45.fc14.i686 #1 SMP Mon Oct 18 23:56:17 UTC 2010
i686 libc:glibc 2.12.90 NPTL 2.12.90 rlimit: STACK 8192k, CORE 0k,
NPROC 1024, NOFILE 1024, AS infinity load average:20.56 6.52 4.06
/proc/meminfo: MemTotal: 1013996 kB MemFree: 112652 kB
Buffers: 4224 kB Cached: 140000 kB
Memory: 4k page, physical 1013996k(112652k free), swap
1535996k(665220k free)
vm_info: Java HotSpot(TM) Client VM (24.51-b03) for linux-x86 JRE
(1.7.0_51-b13), built on Dec 18 2013 18:49:34 by "java_re" with gcc
4.3.0 20080428 (Red Hat 4.3.0-8)
time: Mon Feb 10 16:29:44 2014 elapsed time: 15804 seconds
I am not entering the whole log because it is too long to post. please provide possible solution of Exception log
Please file a bug at https://github.com/kwhat/jnativehook with the entire crash log. Chances are the issue has already been fixed in the 1.2 trunk.
Related
My runtime environment is CentOS 7.9(kernel is version 5.16.11) in the VMBox virtual machine, it is allocated 1G memory and 8 CPU cores.
[root#dev236 ~]# uname -a
Linux dev236 5.16.11-1.el7.elrepo.x86_64 #1 SMP PREEMPT Tue Feb 22 10:22:37 EST 2022 x86_64 x86_64 x86_64 GNU/Linux
I ran a computation-intensive program that used 8 threads to continuously use the CPU.
After some time, the operating system issues a bug alert, like this:
[root#dev236 src]# ./server --p:command-threads-count=8
[31274.179023] rcu: INFO: rcu_preempt self-detected stall on CPU
[31274.179039] watchdog: BUG: soft lockup - CPU#3 stuck for 210S! [server:1356]
[31274.179042] watchdog: BUG: soft lockup - CPU#1 stuck for 210S! [server:1350]
[31274.179070] watchdog: BUG: soft lockup - CPU#7 stuck for 210S! [server:1355]
[31274.179214] rcu: 0-...!: (1 GPs behind) idle=52f/1/0x4000000000000000 softirq=10073864/10073865
fqs=0
Message from syslogd#dev236 at Jan 25 18:59:49 ...
kernel:watchdog: BUG: soft lockup - CPU#3 stuck for 210S! [server:1356]
Message from syslogd#dev236 at Jan 25 18:59:49 ...
kernel:watchdog: BUG: soft lockup - CPU#1 stuck for 210S! [server:1350]
Message from syslogd#dev236 at Jan 25 18:59:49 ...
kernel:watchdog: BUG: soft lockup - CPU#7 stuck for 210S! [server:1355]
^C
[root#dev236 src]#
Then, I looked at the program log, and the log file was constantly being appended, which indicated that my test program was still running.
I wonder if I can ignore this bug tip?
Or, do I have to do something?
for example:
Reduce the computational intensity of the program?
Give the CPU a break once in a while?
Reduce the number of threads started in the program?
Thank you all
Amazon Linux 1:
Server version: Apache/2.4.54 (Amazon)
Server built: Jul 11 2022 21:47:38
Server's Module Magic Number: 20120211:124
Server loaded: APR 1.6.3, APR-UTIL 1.5.4, PCRE 8.21 2011-12-12
PHP 7.3.30 (cli) (built: Oct 6 2021 20:34:22) ( NTS )
Amazon Linux 2:
Server version: Apache/2.4.54 ()
Server built: Jun 30 2022 11:02:23
Server's Module Magic Number: 20120211:124
Server loaded: APR 1.7.0, APR-UTIL 1.6.1, PCRE 8.32 2012-11-30
PHP 7.4.30 (cli) (built: Jun 23 2022 20:19:00) ( NTS )
The server's are configured via automation and loaded into ALB/ASG's.
Instance size is m4.large (2x vCPU, 8GiB Memory)
Auto-Scaling group is configured with Min:4 Max:8
This is what my httpd.conf file looks like:
<IfModule prefork.c>
StartServers 8
MinSpareServers 5
MaxSpareServers 20
ServerLimit 256
MaxClients 256
MaxConnectionsPerChild 4000
</IfModule>
On Amazon Linux 1, the site works as expected. The ASG spawns 4 instances and they each hover at 40-60% CPU utilization during peak hours.
The same build on Amazon Linux 2 yields wildly different results. All instances immediately get bombarded by a huge number of httpd processes.
The ASG scales up to 8 instances with every single one at 90%+ CPU usage. The instances start to lock up which causes the target group to mark them as "unhealthy" and the ASG to rotate them out endlessly. The website obviously does not work.
What could be causing them to behave so differently? What steps can I take to try and mitigate this? I'm honestly pretty new to all this so I don't know where to start.
linux：
[root#localhost bin]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.6 (Maipo)
[root#localhost bin]# cat /proc/version
Linux version 4.14.0-115.5.1.el7a.06.aarch64 (mockbuild#arm-buildhost1) (gcc version 4.8.5 20150623 (NeoKylin 4.8.5-36) (GCC)) #1 SMP Tue Jun 18 10:34:55 CST 2019
[root#localhost bin]# file /bin/bash
/bin/bash: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 3.7.0, BuildID[sha1]=8a346ec01d611062313a5a4ed2b0201ecc9d9fa1, stripped
JxBrower7.7：
i used this demo,the line 55 is:Browser browser = engine.newBrowser();
enter code here
public static void main(String[] args) {
Engine engine = Engine.newInstance(
EngineOptions.newBuilder(OFF_SCREEN).build());
Browser browser = engine.newBrowser();
enter code here
[root#localhost bin]# java -jar test.jar
Exception in thread "main" com.teamdev.jxbrowser.navigation.TimeoutException: Failed to execute task withing 45 seconds.
at com.teamdev.jxbrowser.navigation.internal.NavigationImpl.loadAndWait(NavigationImpl.java:248)
at com.teamdev.jxbrowser.navigation.internal.NavigationImpl.loadUrlAndWait(NavigationImpl.java:105)
at com.teamdev.jxbrowser.navigation.internal.NavigationImpl.loadUrlAndWait(NavigationImpl.java:82)
at com.teamdev.jxbrowser.navigation.internal.NavigationImpl.loadUrlAndWait(NavigationImpl.java:74)
at com.teamdev.jxbrowser.engine.internal.EngineImpl.newBrowser(EngineImpl.java:458)
at com.pinnet.HelloWorld.main(HelloWorld.java:55)
linux logs at /var/logs/messages:
22 09:48:53 localhost dbus[8661]: [system] Activating via systemd: service name='org.bluez' unit='dbus-org.bluez.service'
May 22 09:48:54 localhost abrt-hook-ccpp: Process 90562 (chromium) of user 0 killed by SIGABRT - dumping core
May 22 09:48:54 localhost abrt-hook-ccpp: Process 90566 (chromium) of user 0 killed by SIGABRT - ignoring (repeated crash)
May 22 09:48:54 localhost abrt-hook-ccpp: Process 90561 (chromium) of user 0 killed by SIGABRT - ignoring (repeated crash)
May 22 09:48:54 localhost abrt-hook-ccpp: Process 90593 (chromium) of user 0 killed by SIGABRT - ignoring (repeated crash)
May 22 09:48:55 localhost abrt-hook-ccpp: Process 90624 (chromium) of user 0 killed by SIGABRT - ignoring (repeated crash)
May 22 09:48:55 localhost abrt-hook-ccpp: Process 90623 (chromium) of user 0 killed by SIGABRT - ignoring (repeated crash)
May 22 09:48:56 localhost abrt-server: Duplicate: core backtrace
May 22 09:48:56 localhost abrt-server: DUP_OF_DIR: /var/spool/abrt/ccpp-2020-05-21-16:55:06-33694
May 22 09:48:56 localhost abrt-server: Deleting problem directory ccpp-2020-05-22-09:48:54-90562 (dup of ccpp-2020-05-21-16:55:06-33694)
May 22 09:48:56 localhost abrt-server: /bin/sh: reporter-mailx: 未找到命令
May 22 09:49:18 localhost dbus[8661]: [system] Failed to activate service 'org.bluez': timed out
I'm from Linux server background and very new to JBOSS. I'm trying to setup a IoT application server which requires JBOSS service to provide
a web interface for the application server.
But when i check the JBOSS server state it is showing 'starting', i need this to be 'running'.
# /opt/cgms/bin/jboss-cli.sh --connect controller=127.0.0.1 ":read- attribute(name=server-state)"
{
"outcome" => "success",
"result" => "starting"
}
I can see that the deployment is getting failed when i start JBOSS using the script standalone.sh. I've increased the deployment-timeout
up to 6000 seconds in standalone.xml, still the deployment is failing with the following message in /opt/cgms/standalone/deployments/cgms.ear.failed,
""JBAS015052: Did not receive a response to the deployment operation within the allowed timeout period [6000 seconds].
Check the server configuration file and the server logs to find more about the status of the deployment."
Here is my JBOSS setup details,
[root#app-server ~]# /opt/cgms/bin/jboss-cli.sh --connect
[standalone#localhost:9999 /] version
JBoss Admin Command-line Interface
JBOSS_HOME: /opt/cgms
JBoss AS release: 7.3.0.Final-redhat-14 "Janus"
JBoss AS product: EAP 6.2.0.GA
JAVA_HOME: null
java.version: 1.8.0_65
java.vm.vendor: Oracle Corporation
java.vm.version: 25.65-b01
os.name: Linux
os.version: 3.10.0-229.el7.x86_64
When i check the server.log, it is stuck at,
# tailf /opt/cgms/server/cgms/log/server.log
624: app-server: Aug 12 2017 05:45:01.506 +0000: %IOTFND-6-UNSPECIFIED: %[ch=StdSchedulerFactory][sev=INFO][tid=MSC service thread 1-1]: Quartz scheduler 'CgnmsQuartz' initialized from an externally provided properties instance.
625: app-server: Aug 12 2017 05:45:01.506 +0000: %IOTFND-6-UNSPECIFIED: %[ch=StdSchedulerFactory][sev=INFO][tid=MSC service thread 1-1]: Quartz scheduler version: 2.2.1
It will not go further from here.
I've tried with java 1.7, but the script standalone.sh failed with a java error,
java.lang.UnsupportedClassVersionError: com/cisco/cgms/loglayout/LogHandler : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at org.jboss.modules.ModuleClassLoader.doDefineOrLoadClass(ModuleClassLoader.java:345)
at org.jboss.modules.ModuleClassLoader.defineClass(ModuleClassLoader.java:423)
at org.jboss.modules.ModuleClassLoader.loadClassLocal(ModuleClassLoader.java:261)
at org.jboss.modules.ModuleClassLoader$1.loadClassLocal(ModuleClassLoader.java:76)
Here are my server details,
OS - Red Hat Enterprise Linux Server release 7.1 (Maipo) - runs on Oracle VM VirtualBox
kernel - app-server 3.10.0-229.el7.x86_64 #1 SMP Thu Jan 29 18:37:38 EST 2015 x86_64 x86_64 x86_64 GNU/Linux
When i check netstat, port 80 and 443 are listening.
Please help to fix this problem.
I need to find the virtual address size supported in my PC running Linux Ubuntu. Following is my kernel version:
$ uname -a
Linux ubuntu 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:57:59 UTC 2009 i686 GNU/Linux
I also ran 'free' to know this, as per some earlier posts in this forum:
***#ubuntu:~$ free
total used free shared buffers cached
Mem: 2963968 740752 2223216 0 217648 360296
-/+ buffers/cache: 162808 2801160
Swap: 262136 0 262136
However, the value that I obtained is not a power of 2, as I had expected.
Please let me know the correct way to obtain the total virtual memory address space. Thanks in advance for your help.
Use following command
cat /proc/meminfo
You will get a list of information
You can seeVmallocTotal, is the size of total virtual memory allocated.