[EXEC-65] Watchdog can't destroy 'sudo' and 'sleep'

• Type: Bug
• Status: Reopened
• Priority: Critical
• Resolution: Unresolved
• Affects Version/s: 1.1

Environment

RedHat Enterprise Linux 64bit, JDK 1.6.0_25 64bit.

$ uname -a
Linux demo-vrs1-happdb1.lts.stgt.vrs.cust.disy.net 2.6.9-42.ELsmp #1 SMP Wed Jul 12 23:27:17 EDT 2006 i686 i686 i386 GNU/Linux

$ java -version
java version "1.6.0_25"
Java(TM) SE Runtime Environment (build 1.6.0_25-b06)
Java HotSpot(TM) Server VM (build 20.0-b11, mixed mode)

• Assignee: Siegfried Goeschl
• Reporter: Rusi Filipov
• Created: 25/Mar/12 18:28
• Updated: 29/May/18 12:58

Description

I want to run a command from a shell script with make sure the process will be destroyed after a timeout, especially if it asks for user input or contains sleep commands.

Java

DefaultExecutor executor = new DefaultExecutor();
executor.setStreamHandler(new PumpStreamHandler(System.out, System.err));
ExecuteWatchdog watchDog = new ExecuteWatchdog(3000);
executor.setWatchdog(watchDog);
CommandLine command = new CommandLine("./client.sh");
int exitValue = executor.execute(command);
System.out.println(exitValue);

I run this code on the server like this:

java -cp .:commons-exec-1.1.jar App

Problem 1. I want to run sudo in order to execute a script as a different user:

client.sh

#!/bin/bash
sudo -u occ02 /apps/occ02/catalina_base/bin/restart-occ.sh

In case of a misconfiguration of /etc/sudoers this prompts me for a password.

Password:

And terminates only after about 5 minutes, not 3 seconds:

Exception in thread "main" org.apache.commons.exec.ExecuteException: Process exited with an error: 143 (Exit value: 143)
        at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:377)
        at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:160)
        at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:147)
        at App.destroy2(App.java:51)
        at App.main(App.java:21)

Only if I use the sudo -S ... the process is killed after about 4 seconds:

Password:
Exception in thread "main" org.apache.commons.exec.ExecuteException: Process exited with an error: 1 (Exit value: 1)
        at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:377)
        at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:160)
        at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:147)
        at App.destroy2(App.java:51)
        at App.main(App.java:21)

Problem 2. I want to prevent a too long sleep:

client.sh

#!/bin/bash
sleep 900

The Process just hangs! After 15 minutes the process terminates with this error:

Exception in thread "main" org.apache.commons.exec.ExecuteException: Process exited with an error: 143 (Exit value: 143)
        at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:377)
        at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:160)
        at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:147)
        at App.destroy2(App.java:51)
        at App.main(App.java:21)

If I run the sleep command directly from within Java without the shell-script, the process is destroyed on time:

DefaultExecutor executor = new DefaultExecutor();
executor.setStreamHandler(new PumpStreamHandler(System.out, System.err));
ExecuteWatchdog watchDog = new ExecuteWatchdog(3000);
executor.setWatchdog(watchDog);
CommandLine command = new CommandLine("sleep");
command.addArgument("900");
int exitValue = executor.execute(command);
System.out.println(exitValue);

Exception in thread "main" org.apache.commons.exec.ExecuteException: Process exited with an error: 143 (Exit value: 143)
        at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:377)
        at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:160)
        at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:147)
        at App.destroy4(App.java:67)
        at App.main(App.java:23)

The problems were not visible when I tested on my development machine with Windows 7 64bit and JDK 1.6.0_25, 64bit. But now these issues are a serious barrier for using commons-exec in production.

Btw, with the ProcessBuilder from the JDK the process is destroyed in both cases:

ProcessBuilder builder = new ProcessBuilder("./client.sh");
Process process = builder.start();
Thread.sleep(3000);
process.destroy();

Best regards,
Rusi