Re: [mat-dev] Eclipse MAT hangs

[Антон Мацюк <denixx.baykin@xxxxxxxxx>]

It looks like java is hanging, maybe, because when I attach to local process of Eclipse in JVisualVM, open Threads view of it, then in Eclipse open heapdump, then launching Leak Suspects, it goes by, stops at "Reference Pattern" of section "Problem Suspect 2". At this moment JVisualVM stops refreshing Threads tab (as there is no data to show, of as it is stopped).

Also Eclipse process can't be terminated with kill <PID>, only kill -9 <PID> works.

Also when I tried jstack by PID, it just hanged untill I killed eclipse process.

[denixx@denixxwork ~]$ jstack 1245 > ~/eclipse_hung.tdump
Exception in thread "main" java.io.IOException: Premature EOF
       at sun.tools.attach.HotSpotVirtualMachine.readInt(HotSpotVirtualMachine.java:292)
       at sun.tools.attach.LinuxVirtualMachine.execute(LinuxVirtualMachine.java:199)
       at sun.tools.attach.HotSpotVirtualMachine.executeCommand(HotSpotVirtualMachine.java:261)
       at sun.tools.attach.HotSpotVirtualMachine.remoteDataDump(HotSpotVirtualMachine.java:218)
       at sun.tools.jstack.JStack.runThreadDump(JStack.java:181)
       at sun.tools.jstack.JStack.main(JStack.java:116)

So there is nothing with java, I think, it looks like some native code is hanging.

чт, 19 янв. 2017 г. в 16:41, Marc-André Laperle <marc-andre.laperle@xxxxxxxxxxxx>:

Hi,

Perhaps it's running out of memory? You could check the log file for anything suspicious (out of memory error), in mat/workspace/.metadata/.log
If that's the case, you can increase the heap (Xmx) in MemoryAnalyzer.ini

You could also check the stack trace at the moment it hangs, see https://wiki.eclipse.org/How_to_report_a_deadlock
I normally use this method https://wiki.eclipse.org/How_to_report_a_deadlock#Using_jps_.2F_jstack_.28requires_JDK_1.6_or_later.29

Hope this helps,
Marc-André

---

From: mat-dev-bounces@xxxxxxxxxxx <mat-dev-bounces@xxxxxxxxxxx> on behalf of Антон Мацюк <denixx.baykin@xxxxxxxxx>
Sent: Thursday, January 19, 2017 9:17:45 AM
To: Memory Analyzer Dev list
Subject: Re: [mat-dev] Eclipse MAT hangs

 

Test "Reference Pattern" of section "Problem Suspect 2" hangs, for example.

чт, 19 янв. 2017 г. в 12:26, Антон Мацюк <denixx.baykin@xxxxxxxxx>:

Hi!

There is an issue with Eclipse or MAT, can't figure out exactly what of them is hanging.

It starts to loop in 2 cores of cpu (I have 4 (i5-2310)) and becomes fully unresponsive.

How can I get some additional info from hung state?

Plasma 5. Arch Linux.

Any help would be appreciated.

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