Public bug reported:
I'm creating a sprin boot application that use opncv to read read n cams using
rstp protocol an send images to am angular frontend.
After a few the java application died with this error:
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007f879bce3ec8, pid=9190, tid=9262
#
# JRE version: OpenJDK Runtime Environment (11.0.11+9) (build
11.0.11+9-Ubuntu-0ubuntu2.20.04)
# Java VM: OpenJDK 64-Bit Server VM (11.0.11+9-Ubuntu-0ubuntu2.20.04, mixed
mode, sharing, tiered, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# C [libc.so.6+0xbeec8]
#
# Core dump will be written. Default location: Core dumps may be processed
with "/usr/share/apport/apport %p %s %c %d %P %E" (or dumping to
/home/pietro/data/passportWS/opencv-facedetection-master/core.9190)
#
# An error report file with more information is saved as:
#
/home/pietro/data/passportWS/opencv-facedetection-master/hs_err_pid9190.log
#
# If you would like to submit a bug report, please visit:
# https://bugs.launchpad.net/ubuntu/+source/openjdk-lts
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
the code is above
@Slf4j
public class WebCamService {
public WebCamService(WebCam camData) {
cam.setName(camData.getName());
String url;
if ( Strings.allHaveText(camData.getLogin(),
camData.getPassword() ) ) {
url = String.format( CREDENTIAL_URL_TEMPLATE,
Utils.getUrlProtocol( camData.getUrl() ),camData.getLogin(),
camData.getPassword(), Utils.getUrlAddress( camData.getUrl() ) );
} else {
url = camData.getUrl();
}
cam.setHost( url );
this.id = camData.getId();
if ( Strings.hasText( camData.getSilhouettes() ) ) {
types = Arrays.asList(
camData.getSilhouettes().split(",") );
} else {
types = new ArrayList<String>();
}
}
private static final String CREDENTIAL_URL_TEMPLATE = "%s://%s:%s@%s";
private static final String TOPIC_TEMPLATE = "/topic/%s%s";
private static final String IMG_VIDEO_TEMPLATE = "%s/%s";
private List<String> types;
@Autowired
private SimpMessagingTemplate template;
@Autowired
private NeuralProcessor neuralProcessor;
private WebCamViewer cam = new WebCamViewer();
private ExecutorService read;
private ExecutorService work;
@Value("${video.dir.path}")
private String videoDirPath;
@Value("${image.dir.path}")
private String imageDirPath;
private AtomicBoolean screenshot = new AtomicBoolean(false);
private Long id;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public boolean startCam() {
cam.open();
if (!cam.isOpened()) {
log.error("Error opening video camera {}",
cam.getName() );
} else {
read = Executors.newSingleThreadExecutor();
work = Executors.newSingleThreadExecutor();
String streamTopic = String.format( TOPIC_TEMPLATE, "",
getId() );
String screenTopic = String.format( TOPIC_TEMPLATE,
"screen_", getId() );
log.info("Video camera {} is opened", cam.getName() );
Object _self = this;
AtomicReference<Mat> atomicFrame = new
AtomicReference<Mat>();
read.execute(() -> {
Mat f = new Mat();
int idx = 0;
while (!read.isShutdown() && cam.isOpened()) {
synchronized (_self) {
f.release();
if ( cam.read(f) ) {
atomicFrame.set(f);
}
}
}
});
work.execute(() -> {
int counter = 0;
int err = 0;
Mat f = new Mat();
List<DnnObject> objs = new
ArrayList<DnnObject>();
while (!work.isShutdown() && cam.isOpened()) {
Mat frame = null;
synchronized (_self) {
frame = atomicFrame.get();
if ( frame != null ) {
frame.copyTo(f);
frame = f;
}
}
if (frame != null) {
if (frame.empty()) {
err++;
} else {
err = 0;
if (++counter % 15 ==
0) {
counter = 0;
neuralProcessor.getObjectsInFrame(objs,frame, false, types);
}
if ( screenshot.get() )
{
try {
if (
Utils.saveImage( frame, Utils.generateFilename(
String.format(IMG_VIDEO_TEMPLATE, imageDirPath, cam.getName() ), "jpg" ) ) ) {
this.template.convertAndSend( screenTopic, Utils.getBase64( frame ) );
screenshot.set(false);
}
} catch
(MessagingException e) {
log.error("Error sending topic of screenshoot {}", e);
} catch
(IOException e) {
log.error("Error sending topic of screenshoot {}", e);
}
}
final Mat f1 = frame;
objs.forEach(obj ->
Imgproc.rectangle(f1, obj.getRightTop(), obj.getLeftBottom(), new Scalar(255,
255, 0) ) );
try {
this.template.convertAndSend(streamTopic, Utils.getBase64(frame));
} catch
(MessagingException e) {
log.error("Error sending topic {}", e);
} catch (IOException e)
{
log.error("Error sending topic {}", e);
}
}
frame.release();
if (err >= 10) {
stopCam();
}
}
}
});
}
return cam.isOpened();
}
public boolean stopCam() {
stopRecording();
if ( read != null && !read.isTerminated() ) {
read.shutdown();
}
if ( work != null && !work.isTerminated() ) {
work.shutdown();
}
cam.close();
return !cam.isOpened();
}
public void takeScreenshot() {
if ( cam.isOpened() ) {
screenshot.set( true );
}
}
public boolean isOn() {
return cam.isOpened();
}
}
where WebCamViewer is a simple wrapper of VideoCapture.
In the spring-boot starter class there is an executor that every 30
seconds call
System.runFinalization();
System.gc();
I'd appreciate any advice or direction on how to solve this, thanks
full statck trace here
https://drive.google.com/file/d/114FV0dZ3a_nXIYUrR8SBrXp-lBwuPojd/view?usp=sharing
** Affects: openjdk-lts (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1928334
Title:
openjdk 11 crash with SIGSEGV (0xb) at pc=0x00007f879bce3ec8,
pid=9190, tid=9262 using opencv 4.5.1 on ubuntu 20.04
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