Skip to main content

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [List Home]
Re: [platform-core-dev] debugging blocking jobs

Another user reported the same problem. See
https://bugs.eclipse.org/bugs/show_bug.cgi?id=450527

Szymon



From:	John Arthorne <John_Arthorne@xxxxxxxxxx>
To:	"Eclipse Platform Core component developers list."
            <platform-core-dev@xxxxxxxxxxx>,
Date:	2014-09-25 23:03
Subject:	Re: [platform-core-dev] debugging blocking jobs
Sent by:	platform-core-dev-bounces@xxxxxxxxxxx



I can't think of anything offhand without having access to the VM running
the problem. I does not look familiar to me. It could be as Brian said that
there is a corruption in the data structure leading to an infinite loop,
although I have never seen this before. Another possibility is that there
is a blockage causing a massive backlog of queued jobs that is causing
freezing. The code path in the first thread is when a job is queued to run,
but then there is some currently running job with a conflicting scheduling
rule that it needs to queue behind. There are some debug flags for logging
job events but it is extremely verbose. It is useful when you have a very
specific set of steps to reproduce a problem, and you know the time range
to look in:

# Prints debug information on running background jobs
org.eclipse.core.jobs/jobs=true
# Includes current date and time in job debug information
org.eclipse.core.jobs/jobs/timing=true

It may not help in this case, but in Mars stream support has been added to
dynamically turn this tracing on or off from the tracing preference page.

John




From:        Martin Lippert <mlippert@xxxxxxxxx>
To:        platform-core-dev@xxxxxxxxxxx,
Date:        09/22/2014 10:39 AM
Subject:        [platform-core-dev] debugging blocking jobs
Sent by:        platform-core-dev-bounces@xxxxxxxxxxx



Hey!

I have a question around debugging problems with jobs. I got a number of
thread dumps from users reporting freezes in Eclipse/STS, but I have
difficulties identifying the issue from looking at the thread dumps and I
wonder if you have an idea how to investigate those issues.

Suspicious (to me) is that there is a thread in this state:

"Worker-343" prio=6 tid=0x000000002d791800 nid=0x19cc runnable
[0x0000000039dbf000]
  java.lang.Thread.State: RUNNABLE
                at org.eclipse.core.internal.jobs.InternalJob.addLast
(InternalJob.java:171)
                at org.eclipse.core.internal.jobs.JobManager.nextJob
(JobManager.java:1025)
                - locked <0x00000005f0191fb8> (a java.lang.Object)
                at org.eclipse.core.internal.jobs.JobManager.startJob
(JobManager.java:1519)
                at org.eclipse.core.internal.jobs.WorkerPool.startJob
(WorkerPool.java:221)
                at org.eclipse.core.internal.jobs.Worker.run
(Worker.java:51)

  Locked ownable synchronizers:
                - None

While other threads are blocked because of this lock (for example the main
UI thread):

"main" prio=6 tid=0x0000000002bcd800 nid=0x2284 waiting for monitor entry
[0x000000000012e000]
  java.lang.Thread.State: BLOCKED (on object monitor)
                at org.eclipse.core.internal.jobs.JobManager.doSchedule
(JobManager.java:532)
                - waiting to lock <0x00000005f0191fb8> (a java.lang.Object)
                at org.eclipse.core.internal.jobs.JobManager.schedule
(JobManager.java:1161)
                at org.eclipse.core.internal.jobs.InternalJob.schedule
(InternalJob.java:430)
                at org.eclipse.core.runtime.jobs.Job.schedule(Job.java:500)
                at
org.eclipse.ui.internal.navigator.actions.LinkEditorAction.activateEditor
(LinkEditorAction.java:225)


However, I have no idea how to find out that is really going on here. I
there a good way to analyze this?

Thanks a lot for your help!
-Martin


_______________________________________________
platform-core-dev mailing list
platform-core-dev@xxxxxxxxxxx
To change your delivery options, retrieve your password, or unsubscribe
from this list, visit
https://dev.eclipse.org/mailman/listinfo/platform-core-dev

_______________________________________________
platform-core-dev mailing list
platform-core-dev@xxxxxxxxxxx
To change your delivery options, retrieve your password, or unsubscribe
from this list, visit
https://dev.eclipse.org/mailman/listinfo/platform-core-dev



Back to the top