Hi Kieran,
On 10/03/2010, at 1:32 PM, Kieran Kelleher wrote:
> Use jstack to see the stack traces of the deadlocked request threads.
I've never used jstack before, so I'm fairly unfamiliar with what it's telling
me. I'll paste the full output at the end, but I don't think it found anything
useful.
> Also Wonder has a SessionDeadlock detection feature that is useful to trap
> session deadlocks, report them and fix them. I have found that to be the most
> useful way to find bugs that cause sesion deadlocks.
Do you recall where in Wonder I can find that?
-- jstack output --
# jstack 21749
21749: Unable to open socket file: target process not responding or HotSpot VM
not loaded
# jstack -F 21749
Attaching to process ID 21749, please wait...
Debugger attached successfully.
Client compiler detected.
JVM version is 11.2-b01
Deadlock Detection:
No deadlocks found.
Thread 7218: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
imprecise)
Error occurred during stack walking:
java.lang.NullPointerException
at sun.jvm.hotspot.runtime.Frame.addressOfStackSlot(Frame.java:224)
at
sun.jvm.hotspot.runtime.x86.X86Frame.senderForCompiledFrame(X86Frame.java:342)
at sun.jvm.hotspot.runtime.x86.X86Frame.sender(X86Frame.java:283)
at sun.jvm.hotspot.runtime.Frame.sender(Frame.java:194)
at sun.jvm.hotspot.runtime.Frame.realSender(Frame.java:199)
at sun.jvm.hotspot.runtime.VFrame.sender(VFrame.java:119)
at
sun.jvm.hotspot.runtime.CompiledVFrame.sender(CompiledVFrame.java:168)
at sun.jvm.hotspot.runtime.VFrame.javaSender(VFrame.java:146)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:76)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:45)
at sun.jvm.hotspot.tools.JStack.run(JStack.java:60)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:221)
at sun.jvm.hotspot.tools.JStack.main(JStack.java:86)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.tools.jstack.JStack.runJStackTool(JStack.java:118)
at sun.tools.jstack.JStack.main(JStack.java:84)
Thread 21930: (state = BLOCKED)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=382
(Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453
(Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210
(Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 21929: (state = BLOCKED)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=382
(Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453
(Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210
(Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 21928: (state = IN_NATIVE)
- java.net.PlainSocketImpl.socketAccept(java.net.SocketImpl) @bci=0
(Interpreted frame)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=7, line=384
(Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453
(Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210
(Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 21927: (state = BLOCKED)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=382
(Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453
(Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210
(Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 21926: (state = BLOCKED)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=382
(Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453
(Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210
(Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 21925: (state = BLOCKED)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=382
(Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453
(Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210
(Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 21923: (state = BLOCKED)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=382
(Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453
(Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210
(Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 21922: (state = BLOCKED)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=382
(Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453
(Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210
(Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 21921: (state = BLOCKED)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=382
(Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453
(Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210
(Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 21920: (state = BLOCKED)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=382
(Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453
(Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210
(Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 21919: (state = BLOCKED)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=382
(Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453
(Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210
(Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 21918: (state = BLOCKED)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=382
(Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453
(Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210
(Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 21917: (state = BLOCKED)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=382
(Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453
(Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210
(Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 21916: (state = BLOCKED)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=382
(Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453
(Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210
(Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 21915: (state = BLOCKED)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=382
(Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453
(Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210
(Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 21914: (state = BLOCKED)
- java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=382
(Interpreted frame)
- java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453
(Interpreted frame)
- java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
- com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210
(Interpreted frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
Thread 21885: (state = BLOCKED)
- java.lang.Thread.sleep(long) @bci=0 (Compiled frame; information may be
imprecise)
Error occurred during stack walking:
java.lang.NullPointerException
at sun.jvm.hotspot.runtime.Frame.addressOfStackSlot(Frame.java:224)
at
sun.jvm.hotspot.runtime.x86.X86Frame.senderForCompiledFrame(X86Frame.java:342)
at sun.jvm.hotspot.runtime.x86.X86Frame.sender(X86Frame.java:283)
at sun.jvm.hotspot.runtime.Frame.sender(Frame.java:194)
at sun.jvm.hotspot.runtime.Frame.realSender(Frame.java:199)
at sun.jvm.hotspot.runtime.VFrame.sender(VFrame.java:119)
at
sun.jvm.hotspot.runtime.CompiledVFrame.sender(CompiledVFrame.java:168)
at sun.jvm.hotspot.runtime.VFrame.javaSender(VFrame.java:146)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:76)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:45)
at sun.jvm.hotspot.tools.JStack.run(JStack.java:60)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:221)
at sun.jvm.hotspot.tools.JStack.main(JStack.java:86)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.tools.jstack.JStack.runJStackTool(JStack.java:118)
at sun.tools.jstack.JStack.main(JStack.java:84)
Thread 21884: (state = BLOCKED)
- java.lang.Thread.sleep(long) @bci=0 (Compiled frame; information may be
imprecise)
Error occurred during stack walking:
java.lang.NullPointerException
at sun.jvm.hotspot.runtime.Frame.addressOfStackSlot(Frame.java:224)
at
sun.jvm.hotspot.runtime.x86.X86Frame.senderForCompiledFrame(X86Frame.java:342)
at sun.jvm.hotspot.runtime.x86.X86Frame.sender(X86Frame.java:283)
at sun.jvm.hotspot.runtime.Frame.sender(Frame.java:194)
at sun.jvm.hotspot.runtime.Frame.realSender(Frame.java:199)
at sun.jvm.hotspot.runtime.VFrame.sender(VFrame.java:119)
at
sun.jvm.hotspot.runtime.CompiledVFrame.sender(CompiledVFrame.java:168)
at sun.jvm.hotspot.runtime.VFrame.javaSender(VFrame.java:146)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:76)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:45)
at sun.jvm.hotspot.tools.JStack.run(JStack.java:60)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:221)
at sun.jvm.hotspot.tools.JStack.main(JStack.java:86)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.tools.jstack.JStack.runJStackTool(JStack.java:118)
at sun.tools.jstack.JStack.main(JStack.java:84)
Thread 21835: (state = BLOCKED)
Thread 21833: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
imprecise)
Error occurred during stack walking:
java.lang.NullPointerException
at sun.jvm.hotspot.runtime.Frame.addressOfStackSlot(Frame.java:224)
at
sun.jvm.hotspot.runtime.x86.X86Frame.senderForCompiledFrame(X86Frame.java:342)
at sun.jvm.hotspot.runtime.x86.X86Frame.sender(X86Frame.java:283)
at sun.jvm.hotspot.runtime.Frame.sender(Frame.java:194)
at sun.jvm.hotspot.runtime.Frame.realSender(Frame.java:199)
at sun.jvm.hotspot.runtime.VFrame.sender(VFrame.java:119)
at
sun.jvm.hotspot.runtime.CompiledVFrame.sender(CompiledVFrame.java:168)
at sun.jvm.hotspot.runtime.VFrame.javaSender(VFrame.java:146)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:76)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:45)
at sun.jvm.hotspot.tools.JStack.run(JStack.java:60)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:221)
at sun.jvm.hotspot.tools.JStack.main(JStack.java:86)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.tools.jstack.JStack.runJStackTool(JStack.java:118)
at sun.tools.jstack.JStack.main(JStack.java:84)
Thread 21832: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
imprecise)
Error occurred during stack walking:
java.lang.NullPointerException
at sun.jvm.hotspot.runtime.Frame.addressOfStackSlot(Frame.java:224)
at
sun.jvm.hotspot.runtime.x86.X86Frame.senderForCompiledFrame(X86Frame.java:342)
at sun.jvm.hotspot.runtime.x86.X86Frame.sender(X86Frame.java:283)
at sun.jvm.hotspot.runtime.Frame.sender(Frame.java:194)
at sun.jvm.hotspot.runtime.Frame.realSender(Frame.java:199)
at sun.jvm.hotspot.runtime.VFrame.sender(VFrame.java:119)
at
sun.jvm.hotspot.runtime.CompiledVFrame.sender(CompiledVFrame.java:168)
at sun.jvm.hotspot.runtime.VFrame.javaSender(VFrame.java:146)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:76)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:45)
at sun.jvm.hotspot.tools.JStack.run(JStack.java:60)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:221)
at sun.jvm.hotspot.tools.JStack.main(JStack.java:86)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.tools.jstack.JStack.runJStackTool(JStack.java:118)
at sun.tools.jstack.JStack.main(JStack.java:84)
Thread 21828: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
imprecise)
Error occurred during stack walking:
java.lang.NullPointerException
at sun.jvm.hotspot.runtime.Frame.addressOfStackSlot(Frame.java:224)
at
sun.jvm.hotspot.runtime.x86.X86Frame.senderForCompiledFrame(X86Frame.java:342)
at sun.jvm.hotspot.runtime.x86.X86Frame.sender(X86Frame.java:283)
at sun.jvm.hotspot.runtime.Frame.sender(Frame.java:194)
at sun.jvm.hotspot.runtime.Frame.realSender(Frame.java:199)
at sun.jvm.hotspot.runtime.VFrame.sender(VFrame.java:119)
at
sun.jvm.hotspot.runtime.CompiledVFrame.sender(CompiledVFrame.java:168)
at sun.jvm.hotspot.runtime.VFrame.javaSender(VFrame.java:146)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:76)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:45)
at sun.jvm.hotspot.tools.JStack.run(JStack.java:60)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:221)
at sun.jvm.hotspot.tools.JStack.main(JStack.java:86)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.tools.jstack.JStack.runJStackTool(JStack.java:118)
at sun.tools.jstack.JStack.main(JStack.java:84)
--
Paul.
http://logicsquad.net/
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