Displaying Local Java Vars in jdb crashes target VM

Hi,
                                                                             
getting the values of local variables of reference type can lead to
crashes when debugging. You can reproduce this with the attached Java
program. Just start a VM in debugging mode and attach a debugger of you choice.

I reproduced this issue with:

1.) jdb
2.) eclipse
3.) Netbeans

wait some time and suspend one of the worker threads. While the IDE tries to
display the values of the local variable, the VM will crash with a very
high probability.
                                                                             
The reason for this crash is the following: To get the value of a local
variable holding an object, the VM_GetOrSetLocal VM opeation is used.
This VM operation has a oops_do() method to update the result of getting
 the object during a GC. Unfortunately the method does not what the
author intended. It updates the result only *until* the VM operation was
 executed. If a GC happens between executing the VM operation and
returning to the requesting thread, the result is moved without notice
and the VM can crash. To make this more probable, we GC a lot in three
threads in the test and have a lot of local variables with objects.
                                                                             
Please use attached testcase and do:

java -Xmx512m -agentlib:jdwp=transport=dt_socket,server=y,address=8000,suspend=n GetLocalVarsTest

jdb -connect com.sun.jdi.SocketAttach:hostname=localhost,port=8000
The following test is intermittently failing in C2 baseline nightly
(example is sparc Client VM, 2006-12-07, Solaris-sparc machine vm-e420r-6)
because of this bug:
  nsk/jdi/MonitorContendedEnterRequest/addInstanceFilter

(http://gtee.sfbay/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/2006-12-07/C2_Baseline/vm/SOLSPARC/client/comp/vm-vm_6.0_client_comp_SOLSPARC2006-12-07-20-01-48/ResultDir/addInstanceFilter_copy_1/addInstanceFilter.log)

This is the hs_err log below:

ss45998@vm-e420r-6 hs_err --jvm=/home/ss45998/sgoldman/libjvm.so hs_err_pid11331.log | c++filt
#
# An unexpected error has been detected by Java Runtime Environment:
#
# Internal Error (/net/prt-sparc-q2-11/tmp/PrtBuildDir/workspace/src/share/vm/runtime/handles.cpp, 16 [ Patched ]), pid=11331, tid=55
#
# Java VM: Java HotSpot(TM) Client VM (20061207101238.sgoldman.6463133_deopt-M-fastdebug compiled mode)
#
# Error: assert(SharedSkipVerify || obj->is_oop(),"sanity check")
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
#

--------------- T H R E A D ---------------

Current thread (0x00973c00): JavaThread "Thread-42" [_thread_in_vm, id=55]

Stack: [0xf2100000,0xf2180000), sp=0xf217eb08, free space=506k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0xe4dc8c];; void VMError::report_and_die()+0x7f4
V [libjvm.so+0x3d3fc8];; void report_assertion_failure(const char*,int,const char*)+0x70
V [libjvm.so+0x46b968];; oop*HandleArea::allocate_handle(oop)+0xb8
V [libjvm.so+0x976288];; jvmtiError JvmtiEnv::GetLocalObject(JavaThread*,int,int,_jobject**)+0x1b0
V [libjvm.so+0x803774];; jvmti_GetLocalObject+0x17dc
C [libjdwp.so+0x15a84];; eventInstance+0x114
C [libjdwp.so+0x15dc0];; eventFilterRestricted_passesFilter+0x2d8
C [libjdwp.so+0x17ef8];; event_callback+0x280
C [libjdwp.so+0x1a520];; cbMonitorContendedEnter+0x1d4
V [libjvm.so+0x9cde18];; void JvmtiExport::post_monitor_contended_enter(JavaThread*,ObjectMonitor*)+0xed4
V [libjvm.so+0xcba4d0];; void ObjectMonitor::enter(Thread*)+0x78c
V [libjvm.so+0xcb22f4];; void ObjectSynchronizer::slow_enter(Handle,BasicLock*,Thread*)+0x33c
V [libjvm.so+0xcb1cb8];; void ObjectSynchronizer::fast_enter(Handle,BasicLock*,bool,Thread*)+0x1c0
V [libjvm.so+0x4fea10];; void InterpreterRuntime::monitorenter(JavaThread*,BasicObjectLock*)+0x444
v ~BufferBlob::Interpreter
J nsk.share.jdi.MonitorEnterExecutor.eventMethod()V
J nsk.share.jdi.MonitorEnterExecutor.monitorEnter()V
J nsk.share.jdi.MonitorEnterExecutor.doEventAction()V
J nsk.share.jdi.JDIEventsDebuggee$EventActionsThread.run()V
v ~BufferBlob::StubRoutines (1)
V [libjvm.so+0x52907c];; void JavaCalls::call_helper(JavaValue*,methodHandle*,JavaCallArguments*,Thread*)+0x9c0
V [libjvm.so+0x527298];; void JavaCalls::call_virtual(JavaValue*,KlassHandle,symbolHandle,symbolHandle,JavaCallArguments*,Thread*)+0x448
V [libjvm.so+0x527440];; void JavaCalls::call_virtual(JavaValue*,Handle,KlassHandle,symbolHandle,symbolHandle,Thread*)+0xf4
V [libjvm.so+0x735c74];; void thread_entry(JavaThread*,Thread*)+0x2c0
V [libjvm.so+0xd194d8];; void JavaThread::thread_main_inner()+0x238
V [libjvm.so+0xd19288];; void JavaThread::run()+0x614
V [libjvm.so+0xb773d4];; java_start+0x17c

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
v ~BufferBlob::Interpreter
J nsk.share.jdi.MonitorEnterExecutor.eventMethod()V
J nsk.share.jdi.MonitorEnterExecutor.monitorEnter()V
J nsk.share.jdi.MonitorEnterExecutor.doEventAction()V
J nsk.share.jdi.JDIEventsDebuggee$EventActionsThread.run()V
v ~BufferBlob::StubRoutines (1)

--------------- P R O C E S S ---------------

Java Threads: ( => current thread )
  0x00976c00 JavaThread "Thread-50" [_thread_blocked, id=63]
  0x00975c00 JavaThread "Thread-49" [_thread_blocked, id=62]
  0x00938000 JavaThread "Thread-48" [_thread_blocked, id=61]
  0x00937800 JavaThread "Thread-47" [_thread_blocked, id=60]
  0x00937000 JavaThread "Thread-45" [_thread_blocked, id=59]
  0x00936800 JavaThread "Thread-46" [_thread_blocked, id=58]
  0x0090c000 JavaThread "Thread-44" [_thread_in_Java, id=57]
  0x00143400 JavaThread "Thread-43" [_thread_blocked, id=56]
=>0x00973c00 JavaThread "Thread-42" [_thread_in_vm, id=55]
  0x0019a400 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=11]
  0x0013b800 JavaThread "CompilerThread0" daemon [_thread_in_native, id=10]
  0x00130000 JavaThread "JDWP Command Reader" daemon [_thread_in_native, id=9]
  0x0012e000 JavaThread "JDWP Event Helper Thread" daemon [_thread_blocked, id=8]
  0x0012b400 JavaThread "JDWP Transport Listener: dt_socket" daemon [_thread_blocked, id=7]
  0x00108000 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=6]
  0x000f1400 JavaThread "Finalizer" daemon [_thread_blocked, id=5]
  0x000ec800 JavaThread "Reference Handler" daemon [_thread_blocked, id=4]
  0x0004c000 JavaThread "JDIEventsDebuggee_MainThread" [_thread_blocked, id=2]

Other Threads:
  0x000e8000 VMThread [id=3]
  0x001a0800 WatcherThread [id=12]

VM state:not at safepoint (normal execution)

VM Mutex/Monitor currently owned by a thread: None

Heap
 def new generation total 1984K, used 211K [0xf2c00000, 0xf2e20000, 0xf3310000)
  eden space 1792K, 2% used [0xf2c00000, 0xf2c08f70, 0xf2dc0000)
  from space 192K, 91% used [0xf2df0000, 0xf2e1c008, 0xf2e20000)
  to space 192K, 0% used [0xf2dc0000, 0xf2dc0000, 0xf2df0000)
 tenured generation total 4096K, used 0K [0xf3310000, 0xf3710000, 0xf6c00000)
   the space 4096K, 0% used [0xf3310000, 0xf3310000, 0xf3310200, 0xf3710000)
 compacting perm gen total 12288K, used 2501K [0xf6c00000, 0xf7800000, 0xfac00000)
   the space 12288K, 20% used [0xf6c00000, 0xf6e71448, 0xf6e71600, 0xf7800000)
No shared spaces configured.

Dynamic libraries:
0x00010000 /net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparcv9/jre/bin/java
0xff1b0000 /usr/lib/libthread.so.1
0xff190000 /net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparcv9/jre/bin/../lib/sparc/jli/libjli.so
0xff236000 /usr/lib/libdl.so.1
0xff080000 /usr/lib/libc.so.1
0xff226000 /usr/platform/SUNW,Ultra-80/lib/libc_psr.so.1
0xfd400000 /net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparcv9/jre/lib/sparc/client/libjvm.so
0xff060000 /usr/lib/libsocket.so.1
0xff040000 /usr/lib/libsched.so.1
0xfefe0000 /usr/lib/libm.so.1
0xfefb0000 /usr/lib/libCrun.so.1
0xfef90000 /usr/lib/libdoor.so.1
0xfd300000 /usr/lib/libnsl.so.1
0xfef70000 /usr/lib/libmp.so.2
0xfd2e0000 /net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparcv9/jre/lib/sparc/native_threads/libhpi.so
0xfd1b0000 /net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparcv9/jre/lib/sparc/libjdwp.so
0xfd2b0000 /net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparcv9/jre/lib/sparc/libnpt.so
0xfd290000 /usr/lib/iconv/UTF-8%646.so
0xfd190000 /usr/lib/iconv/646%UTF-8.so
0xfd150000 /net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparcv9/jre/lib/sparc/libverify.so
0xfd100000 /net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparcv9/jre/lib/sparc/libjava.so
0xfd0e0000 /net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparcv9/jre/lib/sparc/libzip.so
0xfd0c0000 /net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparcv9/jre/lib/sparc/libdt_socket.so
0xfd080000 /usr/lib/nss_nis.so.1
0xfd050000 /net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparcv9/jre/lib/sparc/libnet.so
0xfd020000 /export/gtee/testbase/vm/bin/lib/solaris-sparc/nsk/share/jdi/libMonitorEnterExecutor.so

VM Arguments:
jvm_args: -Xcomp -DHANGINGJAVA24717 -XX:-PrintVMOptions -XX:CompileThreshold=100 -Xdebug -Xrunjdwp:transport=dt_socket,address=vm-e420r-6:65269,suspend=y
java_command: nsk.share.jdi.MonitorEventsDebuggee -arch=solaris-sparc -waittime=2 -debugee.vmkind=java -transport.address=dynamic -debugee.vmkeys=-client -Xcomp -DHANGINGJAVA24717 -XX:-PrintVMOptions -XX:CompileThreshold=100 -pipe.port=65268
Launcher Type: SUN_STANDARD

Environment Variables:
CLASSPATH=/net/gtee.sfbay/export/gtee2.0/results/MUSTANG/NIGHTLY/VM-MAIN/2006-12-07/C2_Baseline/vm/SOLSPARC/client/comp/vm-vm_6.0_client_comp_SOLSPARC2006-12-07-20-01-48/gridadm.SunOS.sparc/addInstanceFilter_copy_1:/export/gtee/testbase/vm/bin/classes:/net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparc/lib/tools.jar
PATH=/net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparc/bin:/bin:/usr/bin:/net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparc/jre/bin
LD_LIBRARY_PATH=/net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparcv9/jre/lib/sparc/client:/net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparcv9/jre/lib/sparc:/net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparcv9/jre/../lib/sparc:/export/gtee/testbase/vm/bin/lib/solaris-sparc/nsk/share/jdi::/net/gtee.sfbay/export/gtee/results/MUSTANG/NIGHTLY/VM-MAIN/JDK/c2_baseline/solaris-sparc/jre/lib/sparc/client
SHELL=/bin/sh
DISPLAY=vmsqe.sfbay:0.0

Signal Handlers:
SIGSEGV: [libjvm.so+0xe4ef94], sa_mask[0]=0x7fbffeff, sa_flags=0x0000000c
SIGBUS: [libjvm.so+0xe4ef94], sa_mask[0]=0x7fbffeff, sa_flags=0x0000000c
SIGFPE: [libjvm.so+0xb7f844], sa_mask[0]=0x7fbffeff, sa_flags=0x0000000c
SIGPIPE: [libjvm.so+0xb7f844], sa_mask[0]=0x7fbffeff, sa_flags=0x0000000c
SIGILL: [libjvm.so+0xb7f844], sa_mask[0]=0x7fbffeff, sa_flags=0x0000000c
SIGUSR1: [libjvm.so+0xb7f864], sa_mask[0]=0x00000000, sa_flags=0x00000008
SIGUSR2: [libjvm.so+0xb7f844], sa_mask[0]=0x7fbffeff, sa_flags=0x0000000c
SIGHUP: [libjvm.so+0xb7a41c], sa_mask[0]=0x7fbffeff, sa_flags=0x00000004
SIGINT: [libjvm.so+0xb7a41c], sa_mask[0]=0x7fbffeff, sa_flags=0x00000004
SIGQUIT: [libjvm.so+0xb7a41c], sa_mask[0]=0x7fbffeff, sa_flags=0x00000004
SIGTERM: [libjvm.so+0xb7a41c], sa_mask[0]=0x7fbffeff, sa_flags=0x00000004
SIGQUIT: [libjvm.so+0xb7a41c], sa_mask[0]=0x7fbffeff, sa_flags=0x00000004
SIGTERM: [libjvm.so+0xb7a41c], sa_mask[0]=0x7fbffeff, sa_flags=0x00000004
SIGUSR1: [libjvm.so+0xb7f864], sa_mask[0]=0x00000000, sa_flags=0x00000008
SIGUSR2: [libjvm.so+0xb7f844], sa_mask[0]=0x7fbffeff, sa_flags=0x0000000c


--------------- S Y S T E M ---------------

OS: Solaris 9 9/04 s9s_u7wos_09 SPARC
           Copyright 2004 Sun Microsystems, Inc. All Rights Reserved.
                        Use is subject to license terms.
                             Assembled 29 June 2004

uname:SunOS 5.9 Generic_117171-07 sun4u (T2 libthread)
rlimit: STACK 10000k, CORE infinity, NOFILE 65536, AS infinity
load average:1.50 1.36 1.28

CPU:total 4 has_v8, has_v9, has_vis1

Memory: 8k page, physical 2097152k(1240424k free)

vm_info: Java HotSpot(TM) Client VM (20061207101238.sgoldman.6463133_deopt-M-fastdebug) for solaris-sparc, built on Dec 7 2006 10:53:12 by "PRT" with unknown Workshop:0x580

ss45998@vm-e420r-6