Demonstration of scripts that will hang Ghidra. Part of Bug Report Submission

PrintHangTest.java

import ghidra.app.script.GhidraScript;

public class PrintHangTest extends GhidraScript {

  long STALL_TIME = 60 * 1000; // milliseconds

  @Override
  public void run() throws Exception {
    if (currentProgram == null) {
      return;
    }


    long start = System.currentTimeMillis();
    long stop = start;

    // Set monitor to show canceling does not work
    monitor.setIndeterminate(true);

     // Wait for monitor to show
    Thread.sleep(5000);

    long count = 0;
    while (stop - start < STALL_TIME) {
      println("Hello " + count); // Causes a hang
      //print("Hello " + count + "\n"); // Causes a hang
      //print("Hello " + count); // Causes a hang
      //printf("Hello %d", count); // Causes a hang that is slightly recoverable

      // Even adding a millisecond delay prevents the hanging
      //Thread.sleep(1);

      count++;
      stop = System.currentTimeMillis();
      monitor.checkCanceled();
    }

    float seconds = stop - start;
    float persec = seconds / count;
    seconds = seconds / 1000;

    printf("Printed Hello %d times in %.4f seconds\n", count, seconds);
    printf("That is a print every %e milliseconds\n", persec);
  }
}

printHangTest.py

"""
Script that demos hanging Ghidra by printing quickly to the screen.

Calling println() causes Ghidra to hang, and not respond until a bit after
the script exists
"""
import time

STALL_TIME = 60 # seconds

def main():
    if not currentProgram:
        return

    start = stop = time.time()

    monitor.setIndeterminate(True) # Set monitor to show canceling does not work

    time.sleep(5) # Wait for monitor to show

    count = 0

    while stop - start < STALL_TIME:
        println("Hello %d" % count) # Causes hang
        #print("Hello %d" % count) # Causes soft crash
        #printf("Hello %d\n", count)

        # Even adding a millisecond delay prevents the hanging
        #time.sleep(0.001)

        count += 1
        stop = time.time()
        monitor.checkCanceled()

    seconds = stop - start
    persec = seconds * 1.0 / count

    printf("Printed Hello %d times in %.4f seconds\n", count, seconds)
    printf("That is a print every %e milliseconds\n", persec)

if __name__ == '__main__':
    main()

printHangTestSlightlyResponsive.py

"""
Script that demos hanging Ghidra by printing quickly to the screen.

By calling printf(), it seems it is possible to get Ghidra to cancel the script.
Though Ghidra is still slow to respond.
"""
import time

STALL_TIME = 60 # seconds

import sys
def main():
    if not currentProgram:
        return

    start = stop = time.time()

    monitor.setIndeterminate(True) # Set monitor to show canceling does not work

    time.sleep(5) # Wait for monitor to show

    count = 0

    while stop - start < STALL_TIME:
        #println("Hello %d" % count) # Causes hang
        #print("Hello %d" % count) # Causes soft crash
        printf("Hello %d\n", count)

        # Even adding a millisecond delay prevents the hanging
        #time.sleep(0.001)

        count += 1
        stop = time.time()
        monitor.checkCanceled()

    seconds = stop - start
    persec = seconds * 1.0 / count

    printf("Printed Hello %d times in %.4f seconds\n", count, seconds)
    printf("That is a print every %e milliseconds\n", persec)

if __name__ == '__main__':
    main()

printHangTestSoftCrashes.py

"""
Script that demos hanging Ghidra by printing quickly to the screen.

Calling print() causes Ghidra to remaing in a hanging state seemingly indefinetly.
"""
import time

STALL_TIME = 60 # seconds

def main():
    if not currentProgram:
        return

    start = stop = time.time()

    monitor.setIndeterminate(True) # Set monitor to show canceling does not work

    time.sleep(5) # Wait for monitor to show

    count = 0

    while stop - start < STALL_TIME:
        #println("Hello %d" % count) # Causes hang
        print("Hello %d" % count) # Causes soft crash
        #printf("Hello %d\n", count)

        # Even adding a millisecond delay prevents the hanging
        #time.sleep(0.001)

        count += 1
        stop = time.time()
        monitor.checkCanceled()

    seconds = stop - start
    persec = seconds * 1.0 / count

    printf("Printed Hello %d times in %.4f seconds\n", count, seconds)
    printf("That is a print every %e milliseconds\n", persec)

if __name__ == '__main__':
    main()