It was noticed only on solaris-sparc that jstack can wrong reports
"scenario4" prio=5 tid=XXXXXX nid=XXXXXX XXXXXX
    java.lang.Thread.State: RUNNABLE
   at tmtools.jstack.share.debuggee.ComplexRecursiveStackDebuggee.method186(ComplexRecursiveStackDebuggee.java:1310)
   at tmtools.jstack.share.debuggee.ComplexRecursiveStackDebuggee.method185(ComplexRecursiveStackDebuggee.java:1303)
   at tmtools.jstack.share.debuggee.ComplexRecursiveStackDebuggee.method184(ComplexRecursiveStackDebuggee.java:1296)

although expected stack looks like
 "scenario4" prio=5 tid=XXXXXX nid=XXXXXX XXXXXX
    java.lang.Thread.State: RUNNABLE
   at java.lang.Thread.sleep(Native Method)
   at tmtools.jstack.share.utils.Utils.sleep(Utils.java:31)
   at tmtools.jstack.share.debuggee.ComplexRecursiveStackDebuggee.method699(ComplexRecursiveStackDebuggee.java:4903)
   at tmtools.jstack.share.debuggee.ComplexRecursiveStackDebuggee.method698(ComplexRecursiveStackDebuggee.java:4894)

On windows was noticed other strange stack under the same conditions.
[2014-02-13T08:29:51.41] "scenario" prio=5 tid=XXXXXX nid=XXXXXX XXXXXX
[2014-02-13T08:29:51.41] java.lang.Thread.State: RUNNABLE
[2014-02-13T08:29:51.41] at java.io.FileInputStream.open(Native Method)
[2014-02-13T08:29:51.41] at java.io.FileInputStream.<init>(FileInputStream.java:146)
[2014-02-13T08:29:51.41] at sun.misc.URLClassPath$FileLoader$1.getInputStream(URLClassPath.java:1086)
[2014-02-13T08:29:51.41] at sun.misc.Resource.cachedInputStream(Resource.java:77)
[2014-02-13T08:29:51.41] at sun.misc.Resource.getByteBuffer(Resource.java:160)
[2014-02-13T08:29:51.41] at java.net.URLClassLoader.defineClass(URLClassLoader.java:436)
[2014-02-13T08:29:51.41] at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
[2014-02-13T08:29:51.41] at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
[2014-02-13T08:29:51.41] at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
[2014-02-13T08:29:51.41] at java.security.AccessController.doPrivileged(Native Method)
[2014-02-13T08:29:51.41] at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
[2014-02-13T08:29:51.41] at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
[2014-02-13T08:29:51.41] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
[2014-02-13T08:29:51.41] at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
[2014-02-13T08:29:51.41] at tmtools.jstack.share.debuggee.ComplexRecursiveStackDebuggee.method399(ComplexRecursiveStackDebuggee.java:2803)
[2014-02-13T08:29:51.41] at tmtools.jstack.share.debuggee.ComplexRecursiveStackDebuggee.method398(ComplexRecursiveStackDebuggee.java:2794)

Possibly it is consequences of stack overflow that happens in attached process.