In jdk7 b142 the following sequence of commands:

"stop in <somewhere>
run
<jdb stops when breakpoint hit>
step
where
up 3
where
reenter"

reports:

Exception occurred: java.lang.NullPointerException (uncaught)"thread=MyThread", <...>.MyThread.func1(), line=67 bci=13

And the line 67 is:

    67 return func2(intParam);

After failed reenter, "where" command reports:

MyThread[1] where
  [1] nsk.jdb.reenter.reenter001.MyThread.func1 (reenter001a.java:67)
  [2] nsk.jdb.reenter.reenter001.MyThread.run (reenter001a.java:59)



> stop in nsk.jdb.reenter.reenter001.reenter001a.main
Deferring breakpoint nsk.jdb.reenter.reenter001.reenter001a.main.
It will be set after the class is loaded.
> run
run nsk.jdb.reenter.reenter001.reenter001a
Set uncaught java.lang.Throwable
Set deferred uncaught java.lang.Throwable
>
VM Started: Set deferred breakpoint nsk.jdb.reenter.reenter001.reenter001a.main

Breakpoint hit: "thread=main", nsk.jdb.reenter.reenter001.reenter001a.main(), line=24 bci=0

main[1] stop in nsk.jdb.reenter.reenter001.reenter001a.lastBreak
Set breakpoint nsk.jdb.reenter.reenter001.reenter001a.lastBreak
main[1] cont
>
Breakpoint hit: "thread=MyThread", nsk.jdb.reenter.reenter001.reenter001a.lastBreak(), line=27 bci=0

MyThread[1] threads
Group system:
  (java.lang.ref.Reference$ReferenceHandler)0x140 Reference Handler cond. waiting
  (java.lang.ref.Finalizer$FinalizerThread)0x13f Finalizer cond. waiting
  (java.lang.Thread)0x13e Signal Dispatcher running
  (java.lang.Thread)0x13d Attach Listener running
Group main:
  (java.lang.Thread)0x1 main cond. waiting
  (nsk.jdb.reenter.reenter001.MyThread)0x198 MyThread running (at breakpoint)
MyThread[1] thread 0x198
MyThread[1] step
>
Step completed: "thread=MyThread", nsk.jdb.reenter.reenter001.MyThread.func5(), line=96 bci=14

MyThread[1] where
  [1] nsk.jdb.reenter.reenter001.MyThread.func5 (reenter001a.java:96)
  [2] nsk.jdb.reenter.reenter001.MyThread.func4 (reenter001a.java:88)
  [3] nsk.jdb.reenter.reenter001.MyThread.func3 (reenter001a.java:81)
  [4] nsk.jdb.reenter.reenter001.MyThread.func2 (reenter001a.java:74)
  [5] nsk.jdb.reenter.reenter001.MyThread.func1 (reenter001a.java:67)
  [6] nsk.jdb.reenter.reenter001.MyThread.run (reenter001a.java:59)
MyThread[1] up 3
MyThread[4] where
  [4] nsk.jdb.reenter.reenter001.MyThread.func2 (reenter001a.java:74)
  [5] nsk.jdb.reenter.reenter001.MyThread.func1 (reenter001a.java:67)
  [6] nsk.jdb.reenter.reenter001.MyThread.run (reenter001a.java:59)
MyThread[4] reenter
>
Exception occurred: java.lang.NullPointerException (uncaught)"thread=MyThread", nsk.jdb.reenter.reenter001.MyThread.func1(), line=67 bci=13

MyThread[1] where
  [1] nsk.jdb.reenter.reenter001.MyThread.func1 (reenter001a.java:67)
  [2] nsk.jdb.reenter.reenter001.MyThread.run (reenter001a.java:59)
MyThread[1]