JOSM Freeze due to Move Viewport Whilst ISP suffering Network Errors

[alexkemp]

What steps will reproduce the problem?

1. Use Synaptic to Update All, Load JOSM, do some work
2. Use <Ctrl>+<Arrow-key> to Move Viewport; cursor moves but JOSM is braindead (no warning of any kind)
3. sudo /etc/init.d/network-manager restart has zero change
4. console ping google.com => ping: unknown host google.com
5. ISP confirm is district-wide problem at their end (1 hour telephone call)

What is the expected result?

JOSM should not lock-up because of Network issues

What happens instead?

This is Virgin Cable; what do you expect?

Please provide any additional information below. Attach a screenshot if possible.

• Screenshot whilst JOSM locked is provided.
• Text file from jstack 27457 > jstack-info.txt whilst JOSM locked is provided.
• Computer left switched ON & Status Report below after ISP network working + local network restart + JOSM restart + data recovery.

  URL:http://josm.openstreetmap.de/svn/trunk
  Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
  Last:Changed Date: 2017-04-22 23:35:24 +0200 (Sat, 22 Apr 2017)
  Build-Date:2017-04-22 21:38:34
  Revision:11982
  Relative:URL: ^/trunk
  
  Identification: JOSM/1.5 (11982 en_GB) Linux Debian GNU/Linux 8.7 (jessie)
  Memory Usage: 358 MB / 1636 MB (217 MB allocated, but free)
  Java version: 1.8.0_121-8u121-b13-1~bpo8+1-b13, Oracle Corporation, OpenJDK 64-Bit Server VM
  Screen: :0.0 1366x768
  Maximum Screen Size: 1366x768
  Java package: openjdk-8-jre:amd64-8u121-b13-1~bpo8+1
  Java ATK Wrapper package: libatk-wrapper-java:all-0.30.5-1
  VM arguments: [-Djosm.restart=true, -Djosm.dir.name=JOSM-latest, -Djava.net.useSystemProxies=true]
  Dataset consistency test: No problems found
  
  Plugins:
  + DirectUpload (33182)
  + Mapillary (v1.5.3)
  + apache-commons (32994)
  + apache-http (32699)
  + buildings_tools (33004)
  + continuosDownload (53)
  + terracer (33088)
  
  Last errors/warnings:
  - W: Already here java.net.UnknownHostException: api.openstreetmap.org
  - W: org.openstreetmap.josm.io.OsmApiInitializationException: org.openstreetmap.josm.io.OsmTransferException: java.net.UnknownHostException: api.openstreetmap.org. Cause: org.openstreetmap.josm.io.OsmTransferException: java.net.UnknownHostException: api.openstreetmap.org. Cause: java.net.UnknownHostException: api.openstreetmap.org
  - W: java.net.UnknownHostException: api.openstreetmap.org
  - W: Already here java.net.UnknownHostException: api.openstreetmap.org
  - W: Already here java.net.UnknownHostException: api.openstreetmap.org
  - W: org.openstreetmap.josm.io.OsmApiInitializationException: org.openstreetmap.josm.io.OsmTransferException: java.net.UnknownHostException: api.openstreetmap.org. Cause: org.openstreetmap.josm.io.OsmTransferException: java.net.UnknownHostException: api.openstreetmap.org. Cause: java.net.UnknownHostException: api.openstreetmap.org
  - W: java.net.UnknownHostException: api.openstreetmap.org
  - W: Already here java.net.UnknownHostException: api.openstreetmap.org
  - W: Already here java.net.UnknownHostException: api.openstreetmap.org
  - W: org.openstreetmap.josm.io.OsmApiInitializationException: org.openstreetmap.josm.io.OsmTransferException: java.net.UnknownHostException: api.openstreetmap.org. Cause: org.openstreetmap.josm.io.OsmTransferException: java.net.UnknownHostException: api.openstreetmap.org. Cause: java.net.UnknownHostException: api.openstreetmap.org
  

[alexkemp]

Screen-shot whilst JOSM frozen

[alexkemp]

Result from jstack 27457 > jstack-info.txt obtained whilst JOSM is frozen

[stoecker]

Related to #14659? Background loading broken somehow?

[Don-vip]

The root cause appears in the jstack output (thanks for sharing it):

"pool-2-thread-3" #341 prio=5 os_prio=0 tid=0x0000000000747800 nid=0x71ca in Object.wait() [0x00007fb4cfdfb000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	at java.lang.Object.wait(Object.java:502)
	at javax.swing.text.AbstractDocument.readLock(AbstractDocument.java:1387)
	- locked <0x00000000db04f958> (a javax.swing.text.html.HTMLDocument)
	at javax.swing.plaf.basic.BasicTextUI.getMinimumSize(BasicTextUI.java:942)
	at javax.swing.JComponent.getMinimumSize(JComponent.java:1744)
	at javax.swing.GroupLayout$ComponentSpring.calculateNonlinkedMinimumSize(GroupLayout.java:3008)
	at javax.swing.GroupLayout$ComponentSpring.calculateMinimumSize(GroupLayout.java:2972)
	at javax.swing.GroupLayout$Spring.getMinimumSize(GroupLayout.java:1336)
	at javax.swing.GroupLayout$ComponentSpring.calculatePreferredSize(GroupLayout.java:2979)
	at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1346)
	at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1638)
	at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1627)
	at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1602)
	at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1346)
	at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1638)
	at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1625)
	at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1602)
	at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1346)
	at javax.swing.GroupLayout.calculateAutopadding(GroupLayout.java:1071)
	at javax.swing.GroupLayout.prepare(GroupLayout.java:1058)
	at javax.swing.GroupLayout.preferredLayoutSize(GroupLayout.java:878)
	at java.awt.Container.preferredSize(Container.java:1796)
	- locked <0x000000008d4dd180> (a java.awt.Component$AWTTreeLock)
	at java.awt.Container.getPreferredSize(Container.java:1780)
	at javax.swing.JComponent.getPreferredSize(JComponent.java:1664)
	at java.awt.FlowLayout.preferredLayoutSize(FlowLayout.java:414)
	- locked <0x000000008d4dd180> (a java.awt.Component$AWTTreeLock)
	at java.awt.Container.preferredSize(Container.java:1796)
	- locked <0x000000008d4dd180> (a java.awt.Component$AWTTreeLock)
	at java.awt.Container.getPreferredSize(Container.java:1780)
	at javax.swing.JComponent.getPreferredSize(JComponent.java:1664)
	at org.openstreetmap.josm.gui.NotificationManager.processQueue(NotificationManager.java:110)
	at org.openstreetmap.josm.gui.NotificationManager.showNotification(NotificationManager.java:95)
	- locked <0x00000000943387c0> (a java.util.LinkedList)
	at org.openstreetmap.josm.gui.Notification.show(Notification.java:211)
	at org.openstreetmap.josm.plugins.mapillary.io.download.BoundsDownloadRunnable.run(BoundsDownloadRunnable.java:44)
	at org.openstreetmap.josm.plugins.mapillary.io.download.MapillarySquareDownloadRunnable.run(MapillarySquareDownloadRunnable.java:33)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

"pool-2-thread-2" #328 prio=5 os_prio=0 tid=0x000000000072f000 nid=0x71ba waiting for monitor entry [0x00007fb4cfbfa000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at org.openstreetmap.josm.gui.NotificationManager.showNotification(NotificationManager.java:94)
	- waiting to lock <0x00000000943387c0> (a java.util.LinkedList)
	at org.openstreetmap.josm.gui.Notification.show(Notification.java:211)
	at org.openstreetmap.josm.plugins.mapillary.io.download.BoundsDownloadRunnable.run(BoundsDownloadRunnable.java:44)
	at org.openstreetmap.josm.plugins.mapillary.io.download.MapillarySquareDownloadRunnable.run(MapillarySquareDownloadRunnable.java:33)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

So this is again the deadlock caused by NotificationManager. There's already a ticket on this. Probably the root cause of #14659 as well.

[Don-vip]

Closed as duplicate of #13809.