driver.quite

Everytime I implement driver.quit() in AfterTest annotation I see the below message in console , is it expected ??

@AfterTest
public void closeBrowser(){
app.closeBrowser();
}

[b:1dr3hghe]Oct 21, 2015 6:59:04 PM org.openqa.selenium.os.UnixProcess$SeleniumWatchDog destroyHarder
INFO: Command failed to close cleanly. Destroying forcefully (v2). org.openqa.selenium.os.UnixProcess$SeleniumWatchDog@73c3e130[/b:1dr3hghe]