Not able to kill java process with average 90% cpu usage

Squall90 · 05-11-2010, 12:50 PM

Hi,

I have a java process running in background. I have no java dependent program opened and even if I had, this program should be killed if I kill the Java process.

“top” shows that Java causes almost 90% cpu usage.

Code:

christian@tux:~$ ps x|grep java
 3409 pts/0    S+     0:00 grep java
10184 tty1     Sl   1123:29 /usr/lib/java/jre/bin/java -D__jvm_launched=32562616674 -Xbootclasspath/a:/usr/lib/java/jre/lib/deploy.jar:/usr/lib/java/jre/lib/javaws.jar:/usr/lib/java/jre/lib/plugin.jar -Djava.class.path=/usr/lib/java/jre/classes sun.plugin2.main.client.PluginMain write_pipe_name=/tmp/.com.sun.deploy.net.socket.7907.3155126540883352253.AF_UNIX

I already tried to kill it by $ kill 10184 but I didn't work. Same with killall java, as user and as root.

The only way I can imagine is to restart, but this might happen again. Any clues to solve this?

Thanks

AlucardZero · 05-11-2010, 12:53 PM

kill -9 10184

man kill

Squall90 · 05-11-2010, 02:48 PM

Wow, very powerful!^^ Thank you.

But the “-9” parameter is not mentioned in my local man pages.

kingbeowulf · 05-11-2010, 03:14 PM

The parameter is "-n" where "n" is any numerical digit larger than "1"

kingbeowulf · 05-11-2010, 03:23 PM

Oops, hit post too soon. The "-n" parameter is the numerical signal identifier, see "man 7 signal" and for a short list enter "kill -l"

AlucardZero · 05-11-2010, 04:03 PM

the signal explanation is in my "man kill" :

Code:

SYNOPSIS
       kill [ -signal | -s signal ] pid ...
       kill [ -L | -V, --version ]
       kill -l  [ signal ]

DESCRIPTION
       The default signal for kill is TERM. Use -l or -L to list available signals.  Particularly
       useful signals include HUP, INT, KILL, STOP, CONT, and 0.  Alternate signals may be speci‐
       fied  in  three  ways: -9 -SIGKILL -KILL.  Negative PID values may be used to choose whole
       process groups; see the PGID column in ps command output. A PID of -1 is special; it indi‐
       cates all processes except the kill process itself and init.

SIGNALS
       The signals listed below may be available for use with kill.  When known constant, numbers
       and default behavior are shown.

       Name     Num   Action    Description
       0          0   n/a       exit code indicates if a signal may be sent
       ALRM      14   exit
       HUP        1   exit
       INT        2   exit
       KILL       9   exit      cannot be blocked

Squall90 · 05-11-2010, 04:22 PM

Ah, I see. Thank you.

bgeddy · 05-11-2010, 04:29 PM

Well although I already knew of the kill -9 call I just checked my man page and found this :

Code:

KILL(1)                                                                          Linux Programmer's Manual                                                                         KILL(1)

NAME
       kill - terminate a process

SYNOPSIS
       kill [ -s signal | -p ] [ -a ] [ -- ] pid ...
       kill -l [ signal ]

- which is different to the one posted by AlucardZero. Note it doesn't mention "kill -signal" but has "kill -s signal".

dive · 05-11-2010, 04:37 PM

-9 can be used instead of -s 9

bgeddy · 05-11-2010, 04:52 PM

Quote:

-9 can be used instead of -s 9

Yes - I know this but my point is the OP was right - the man page doesn't mention this. Although the post from AlucardZero's man page does. Maybe as AlucardZero used another distro.

Richard Cranium · 05-11-2010, 05:05 PM

Quote:

Originally Posted by Squall90

Hi,

I have a java process running in background. I have no java dependent program opened and even if I had, this program should be killed if I kill the Java process.

“top” shows that Java causes almost 90% cpu usage.

Code:

christian@tux:~$ ps x|grep java
 3409 pts/0    S+     0:00 grep java
10184 tty1     Sl   1123:29 /usr/lib/java/jre/bin/java -D__jvm_launched=32562616674 -Xbootclasspath/a:/usr/lib/java/jre/lib/deploy.jar:/usr/lib/java/jre/lib/javaws.jar:/usr/lib/java/jre/lib/plugin.jar -Djava.class.path=/usr/lib/java/jre/classes sun.plugin2.main.client.PluginMain write_pipe_name=/tmp/.com.sun.deploy.net.socket.7907.3155126540883352253.AF_UNIX

I already tried to kill it by $ kill 10184 but I didn't work. Same with killall java, as user and as root.

The only way I can imagine is to restart, but this might happen again. Any clues to solve this?

Thanks

The "javaws" bit indicates that you opened a web site that wanted you to download and execute some java executable.

AlucardZero · 05-11-2010, 05:29 PM

Yeah, mine was Debian. I come here from the Zero Reply Thread page and don't always know what subforum I'm in

Squall90 · 05-12-2010, 04:30 AM

Quote:

Originally Posted by Richard Cranium

The "javaws" bit indicates that you opened a web site that wanted you to download and execute some java executable.

Yes, a Java (FX) applet that I wrote and tested. ^^

Richard Cranium · 05-12-2010, 03:02 PM

Quote:

Originally Posted by Squall90

Yes, a Java (FX) applet that I wrote and tested. ^^

Ah. One would have thought that you didn't know what launched the program from your original post...

Quote:

I have no java dependent program opened

...so never mind.