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Re: Memory leak but only on Red Hat
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Re: Memory leak but only on Red Hat

  • Subject: Re: Memory leak but only on Red Hat
  • From: D Tim Cummings <email@hidden>
  • Date: Wed, 1 Dec 2010 17:00:35 +1000
Hi Q

WOHTTPConnection sendRequest(WORequest request) creates a new thread to implement timeout.  I was creating threads also because the sendRequest implementation of timeout wasn't working for me.  I disabled my code that created threads but was still getting the OutOfMemory problem.

Start of the thread dump below. I was able to reproduce the problem by manually clicking on the refresh page button over and over again.

jstack 9451
2010-12-01 16:52:02
Full thread dump Java HotSpot(TM) 64-Bit Server VM (16.3-b01 mixed mode):

"Attach Listener" daemon prio=10 tid=0x0000000057371800 nid=0x4485 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Thread-1129" prio=10 tid=0x0000000057093800 nid=0x2cde in Object.wait() [0x000000005bb4a000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaab07d17a8> (a [Z)
at java.lang.Object.wait(Object.java:485)
at com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
- locked <0x00002aaab07d17a8> (a [Z)
at java.lang.Thread.run(Thread.java:619)

"Thread-1126" prio=10 tid=0x00000000564f8000 nid=0x2cdb in Object.wait() [0x000000005ba49000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaab0784fc8> (a [Z)
at java.lang.Object.wait(Object.java:485)
at com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
- locked <0x00002aaab0784fc8> (a [Z)
at java.lang.Thread.run(Thread.java:619)

"Thread-1123" prio=10 tid=0x00000000564af000 nid=0x2cd8 in Object.wait() [0x000000005b948000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaab073c040> (a [Z)
at java.lang.Object.wait(Object.java:485)
at com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
- locked <0x00002aaab073c040> (a [Z)
at java.lang.Thread.run(Thread.java:619)

"Thread-1120" prio=10 tid=0x00000000563e0800 nid=0x2cd5 in Object.wait() [0x000000005b847000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaab06f18f0> (a [Z)
at java.lang.Object.wait(Object.java:485)
at com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
- locked <0x00002aaab06f18f0> (a [Z)
at java.lang.Thread.run(Thread.java:619)

"Thread-1117" prio=10 tid=0x000000005695c000 nid=0x2cd2 in Object.wait() [0x000000005b746000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaab06a5360> (a [Z)
at java.lang.Object.wait(Object.java:485)
at com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
- locked <0x00002aaab06a5360> (a [Z)
at java.lang.Thread.run(Thread.java:619)

"Thread-1114" prio=10 tid=0x00000000566de800 nid=0x2cc0 in Object.wait() [0x000000005b645000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaab0659af8> (a [Z)
at java.lang.Object.wait(Object.java:485)
at com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
- locked <0x00002aaab0659af8> (a [Z)
at java.lang.Thread.run(Thread.java:619)

"Thread-1111" prio=10 tid=0x0000000057098800 nid=0x2cbd in Object.wait() [0x000000005b544000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaab060e6a0> (a [Z)
at java.lang.Object.wait(Object.java:485)
at com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
- locked <0x00002aaab060e6a0> (a [Z)
at java.lang.Thread.run(Thread.java:619)

"Thread-1108" prio=10 tid=0x0000000057097800 nid=0x2cba in Object.wait() [0x000000005b443000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaab05c45f8> (a [Z)
at java.lang.Object.wait(Object.java:485)
at com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
- locked <0x00002aaab05c45f8> (a [Z)
at java.lang.Thread.run(Thread.java:619)

"Thread-1105" prio=10 tid=0x0000000057330000 nid=0x2cb7 in Object.wait() [0x000000005b342000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaab057f298> (a [Z)
at java.lang.Object.wait(Object.java:485)
at com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
- locked <0x00002aaab057f298> (a [Z)
at java.lang.Thread.run(Thread.java:619)

"Thread-1102" prio=10 tid=0x00000000564b5800 nid=0x2cb4 in Object.wait() [0x000000005b241000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaab0535cc8> (a [Z)
at java.lang.Object.wait(Object.java:485)
at com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
- locked <0x00002aaab0535cc8> (a [Z)
at java.lang.Thread.run(Thread.java:619)

"Thread-1099" prio=10 tid=0x00000000564ee000 nid=0x2cb1 in Object.wait() [0x000000005b140000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaab04e9d98> (a [Z)
at java.lang.Object.wait(Object.java:485)
at com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
- locked <0x00002aaab04e9d98> (a [Z)
at java.lang.Thread.run(Thread.java:619)

"Thread-1096" prio=10 tid=0x000000005699a800 nid=0x2cae in Object.wait() [0x000000005b03f000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaab049ea28> (a [Z)
at java.lang.Object.wait(Object.java:485)
at com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
- locked <0x00002aaab049ea28> (a [Z)
at java.lang.Thread.run(Thread.java:619)



On 01/12/2010, at 4:04 PM, Q wrote:


On 01/12/2010, at 3:36 PM, D Tim Cummings wrote:

We have a sessionless app that we have been running for years on Mac OS X on XServes.  We recently moved it to Red Hat servers and now we are getting Out of Memory errors even though we have significantly increased the memory available.  Red Hat is using the java sun jvm 1.6.0_20 64 bit, while the Mac servers were running java from Apple 1.5.0_24.  I also tried on my Mac workstation using Apple java 1.6.0.22 64 bit and the memory appeared to be getting garbage collected without problem.

I configured the app to do a heap dump when the error occured (Additional arguments -XX:+HeapDumpOnOutOfMemoryError ) and used the Eclipse Memory Analyzer Tool (http://www.eclipse.org/mat) and it reported the following problem suspects:

1,296 instances of "java.lang.Thread", loaded by "<system class loader>" occupy 111,947,632 (43.21%) bytes.
1,292 instances of "er.extensions.eof.ERXEC", loaded by "java.net.URLClassLoader @ 0x2aaab375b7c0" occupy 37,478,352 (14.46%) bytes.
1,280 instances of "er.extensions.appserver.ERXRequest", loaded by "java.net.URLClassLoader @ 0x2aaab375b7c0" occupy 27,297,992 (10.54%) bytes. 

It looks to me like your app had 1280 odd concurrent request handling threads running. Is it likely that they are getting deadlocked or not running to completion? Do you launch any new threads programmatically?

Try making a thread dump of the app and see what's running.

-- 
Seeya...Q

Quinton Dolan - email@hidden
Gold Coast, QLD, Australia (GMT+10)





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References: 
 >Memory leak but only on Red Hat (From: D Tim Cummings <email@hidden>)
 >Re: Memory leak but only on Red Hat (From: Q <email@hidden>)

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