The implementation of methodOopDesc::method_from_bcp needs to be
re-examined with to make it safe to use in all heap configurations.
This is used with the full speed debugging with C2. The current
implementation is unsafe because it uses block_start when the VM
is not at a safepoint. The following demonstrates one such crash in
when NSK tests are run in -server -XX:+UseConcMarkSweepGC mode :-


#!/bin/sh

LD_LIBRARY_PATH=/export/Scratch/alanb/nsk/testbase_vm.1.5/src/nsk/share/lib/intel:/export/Users/alanb/ws/service_sdk_baseline/build/solaris-i586/jre/lib/i386/client
CLASSPATH=/export/Scratch/alanb/nsk/results/solx86_server_cms_jdi/ab23780.Solaris.x86/nextevent001:/export/Scratch/alanb/nsk/testbase_vm.1.5/bin/classes:/export/Users/alanb/ws/service_sdk_baseline/build/solaris-i586/lib/tools.jar
DISPLAY=mrbean:0.0
PATH=/export/Users/alanb/ws/service_sdk_baseline/build/solaris-i586/bin:/export/Users/alanb/ws/service_sdk_baseline/build/solaris-i586/jre/bin
RAS_OPTIONS=
HOME=/home/ab23780
SHELL=/bin/sh

while [ $# -gt 0 ];
do
  if [ $1 = "-jdk" ]; then
shift 1
PATH=${1}/bin:${PATH}
shift 1
  else
if [ $1 = "-d" ]; then
shift 1
if [ $# -gt 0 ]; then
DISPLAY=$1
shift 1
else
DISPLAY=:0.0
fi
fi
  fi
done

export LD_LIBRARY_PATH
export CLASSPATH
export DISPLAY
export PATH
export RAS_OPTIONS
export HOME
export SHELL
/export/Users/alanb/ws/service_sdk_baseline/build/solaris-i586/bin/java -client nsk.jdi.EventIterator.nextEvent.nextevent001 -arch=intel -waittime=1 -debugee.vmkind=java "-debugee.vmkeys=-server -XX:+UseConcMarkSweepGC -XX:-SafepointPolling"
##Exit status of execution step=97
##Core file exists
##!checkExitCode

#debugee.stdout> # To suppress the following error report, specify this argument
#debugee.stdout> # after -XX: or in .hotspotrc: SuppressErrorAt=/mutexLocker.cpp:100]
#debugee.stdout> #
#debugee.stdout> # An unexpected error has been detected by HotSpot Virtual Machine:
#debugee.stdout> #
#debugee.stdout> # Internal Error (/net/jsn2/export/Users/alanb/ws/jvmti/src/share/vm/runtime/mutexLocker.cpp, 100), pid=5322, tid=22
#debugee.stdout> #
#debugee.stdout> # Java VM: Java HotSpot(TM) Server VM (1.5-internal-debug mixed mode)
#debugee.stdout> #
#debugee.stdout> # Error: must own lock Heap_lock
#debugee.stdout> # An error report file with more information is saved as hs_err_pid5322.log
#debugee.stdout> #
#debugee.stdout> # If you would like to submit a bug report, please visit:
#debugee.stdout> # http://java.sun.com/cgi-bin/bugreport.cgi
#debugee.stdout> #
#debugee.stdout> VM option '+UseConcMarkSweepGC'
#debugee.stdout> VM option '-SafepointPolling'
#debugee.stdout> Current thread is 22
#debugee.stdout> Dumping core ...
##>
##> WARNING: switching log to verbose mode,
##> because error is complained
##>
#--> debugger: launching a debuggee :
#--> debugger: nsk.jdi.EventIterator.nextEvent.nextevent001a
#binder> VirtualMachineManager: version 1.4
#binder> Finding connector: default
#binder> LaunchingConnector:
#binder> name: com.sun.jdi.CommandLineLaunch
#binder> description: Launches target using Sun Java VM command line and attaches to it
#binder> transport: com.sun.tools.jdi.SunCommandLineLauncher$2@291aff
#binder> Connector arguments:
#binder> home=/export/Scratch/alanb/builds/service_sdk_baseline/build/solaris-i586
#binder> vmexec=java
#binder> options=-server -XX:+UseConcMarkSweepGC -XX:-SafepointPolling
#binder> main=nsk.jdi.EventIterator.nextEvent.nextevent001a -arch=intel "-waittime=1" "-debugee.vmkind=java" "-debugee.vmkeys=-server -XX:+UseConcMarkSweepGC -XX:-SafepointPolling"
#binder> quote="
#binder> suspend=true
#binder> Launching debugee
#binder> Redirecting VM output
er: a MethodEntry has been set up
#--> debugger: ......setting up MethodExit:
#--> debugger: thread: instance of nsk.jdi.EventIterator.nextEvent.nextevent001a$Thread1nextevent001a(name='mexThread', id=74); class: class nsk.jdi.EventIterator.nextEvent.TestClass (loaded by instance of sun.misc.Launcher$AppClassLoader(id=54)); property: mexThread
#--> debugger: a MethodExit has been set up
#--> debugger: ......setting up Step:
#--> debugger: thread: instance of nsk.jdi.EventIterator.nextEvent.nextevent001a$Thread2nextevent001a(name='stThread', id=73); property: stThread
#--> debugger: a Step has been set up
#--> debugger: :::::::::vm.resume();
#--> debugger: ......getting and checking up on Events
#debugee.stdout> # To suppress the following error report, specify this argument
#debugee.stdout> # after -XX: or in .hotspotrc: SuppressErrorAt=/mutexLocker.cpp:100]
#debugee.stdout> #
#debugee.stdout> # An unexpected error has been detected by HotSpot Virtual Machine:
#debugee.stdout> #
#debugee.stdout> # Internal Error (/net/jsn2/export/Users/alanb/ws/jvmti/src/share/vm/runtime/mutexLocker.cpp, 100), pid=5322, tid=22
#debugee.stdout> #
#debugee.stdout> # Java VM: Java HotSpot(TM) Server VM (1.5-internal-debug mixed mode)
#debugee.stdout> #
#debugee.stdout> # Error: must own lock Heap_lock
#debugee.stdout> # An error report file with more information is saved as hs_err_pid5322.log
#debugee.stdout> #
#debugee.stdout> # If you would like to submit a bug report, please visit:
#debugee.stdout> # http://java.sun.com/cgi-bin/bugreport.cgi
#debugee.stdout> #
#debugee.stdout> VM option '+UseConcMarkSweepGC'
#debugee.stdout> VM option '-SafepointPolling'
#debugee.stdout> Current thread is 22
#debugee.stdout> Dumping core ...
## ERROR: ##> debugger: ERROR: else clause in detecting type of event1
## ERROR: ##> debugger: ERROR: event duplication: null
## ERROR: ##> debugger: ERROR: Exception : nsk.jdi.EventIterator.nextEvent.nextevent001$JDITestRuntimeException: JDITestRuntimeException : ** EXCEPTION while waiting for event ** : com.sun.jdi.VMDisconnectedException
## ERROR: ##> debugger: test phase has not finished normally: debuggee is still alive
#--> debugger: ......forcing: vm.exit();
## ERROR: ##> debugger: ERROR: Exception : e
#TEST FAILED
#
#
##>
##> SUMMARY: Following errors occured
##> during test execution:
##>
## ERROR: ##> debugger: ERROR: else clause in detecting type of event1
## ERROR: ##> debugger: ERROR: event duplication: null
## ERROR: ##> debugger: ERROR: Exception : nsk.jdi.EventIterator.nextEvent.nextevent001$JDITestRuntimeException: JDITestRuntimeException : ** EXCEPTION while waiting for event ** : com.sun.jdi.VMDisconnectedException
## ERROR: ##> debugger: test phase has not finished normally: debuggee is still alive
## ERROR: ##> debugger: ERROR: Exception : e



Here's the backtrace from the core file :-


  [1] __sigprocmask(0x0, 0x18, 0xdfb99000), at 0xdfb86971
  [2] _resetsig(), at 0xdfb7d4b5
  [3] _sigon(), at 0xdfb7cdbe
  [4] _lmutex_unlock(0xdfba0540), at 0xdfb7a7d0
  [5] _thrp_kill(), at 0xdfb7f477
  [6] _ti_thr_kill(0x18, 0x6), at 0xdfb7f368
  [7] raise(0x6), at 0xdfaeb6ff
  [8] abort(), at 0xdfadbb30
  [9] os::abort(0x1), at 0xde36869d
=>[10] VMError::report_and_die(this = ???) (optimized), at 0xde4c2482 (line ~679) in "vmError.cpp"
  [11] report_fatal(file_name = ???, line_no = ???, message = ???) (optimized), at 0xddf45d3f (line ~216) in "debug.cpp"
  [12] report_fatal_vararg(file_name = ???, line_no = ???, format = ???, ...) (optimized), at 0xddf45d80 (line ~225) in "debug.cpp"
  [13] assert_locked_or_safepoint(lock = ???) (optimized), at 0xde336868 (line ~100) in "mutexLocker.cpp"
  [14] CompactibleFreeListSpace::verify_objects_initialized(this = ???) (optimized), at 0xddef332b (line ~665) in "compactibleFreeListSpace.cpp"
  [15] CompactibleFreeListSpace::block_start(this = ???, p = ???) (optimized), at 0xddef358a (line ~741) in "compactibleFreeListSpace.cpp"
  [16] GenerationBlockStartClosure::do_space(this = ???, s = ???) (optimized), at 0xddfb810f (line ~152) in "generation.cpp"
  [17] ConcurrentMarkSweepGeneration::space_iterate(this = ???, blk = ???, usedOnly = ???) (optimized), at 0xddf19644 (line ~617) in "concurrentMarkSweepGeneration.cpp"
  [18] Generation::block_start(this = ???, p = ???) (optimized), at 0xddfb695a (line ~161) in "generation.cpp"
  [19] methodOopDesc::method_from_bcp(0xd752d792), at 0xde3242ea
  [20] Bytecodes::non_breakpoint_code_at(bcp = ???, method = ???) (optimized), at 0xdde4bf72 (line ~30) in "bytecodes.cpp"
  [21] InterpreterRuntime::already_resolved(thread = ???) (optimized), at 0xde01a905 (line ~23) in "interpreterRuntime.hpp"
  [22] InterpreterRuntime::resolve_invoke(thread = ???, bytecode = ???) (optimized), at 0xde015636 (line ~542) in "interpreterRuntime.cpp"
  [23] 0xdb81ac15(), at 0xdb81ac14
  [24] 0xdb80324b(), at 0xdb80324a
  [25] 0xdb8000fa(0xd0ca0898, 0xd0ca0ac4, 0xa, 0xd753d560, 0xdb80b480, 0xd0ca09a8, 0x1, 0x8193250), at 0xdb8000f9
  [26] JavaCalls::call_helper(result = ???, m = ???, args = ???, __the_thread__ = ???) (optimized), at 0xde02758f (line ~367) in "javaCalls.cpp"
  [27] os::os_exception_wrapper(0xde027304, 0xd0ca0ac0, 0xd0ca0938, 0xd0ca09a0, 0x8193250), at 0xde36baf5
  [28] JavaCalls::call(result = ???, method = CLASS, args = ???, __the_thread__ = ???) (optimized), at 0xde0272ff (line ~286) in "javaCalls.cpp"
  [29] JavaCalls::call_virtual(result = ???, spec_klass = CLASS, name = CLASS, signature = CLASS, args = ???, __the_thread__ = ???) (optimized), at 0xde026a65 (line ~182) in "javaCalls.cpp"
  [30] JavaCalls::call_virtual(result = ???, receiver = CLASS, spec_klass = CLASS, name = CLASS, signature = CLASS, __the_thread__ = ???) (optimized), at 0xde026bc7 (line ~188) in "javaCalls.cpp"
  [31] thread_entry(thread = 0x8193250, __the_thread__ = 0x8193250), line 2181 in "jvm.cpp"
  [32] JavaThread::thread_main_inner(this = ???) (optimized), at 0xde467cf1 (line ~1214) in "thread.cpp"
  [33] JavaThread::run(this = ???) (optimized), at 0xde467b72 (line ~1198) in "thread.cpp"
  [34] _start(0x8193250, 0xde367150), at 0xde36722a
(dbx)
http://vmsqe.sfbay/nightly/mantis/DTWS/results/11-26-05/ServerVM/Solsparc/mixed/Gc_Baseline-Xconc/nsk.jvmti-NIGHTLY-Gc_Baseline-Xconc-ServerVM-mixed-Solsparc-2005-11-26-22-30-49/ResultDir/clrbrk001/hs_err_pid14945.log

For the tlog file itself, replace the last component of URL with clrbrk001.log

----

#!/usr/bin/sh

CLASSPATH=/var/tmp/Work/Work/exec/nsk.jvmti-NIGHTLY-Gc_Baseline-Xconc-ServerVM-mixed-Solsparc-2005-11-26-22-30-49/run2/fhsu.Solaris.sparc/clrbrk001:/net/vmsqe.sfbay/export/backup/testbase/testbase_vm.1.6_r02/vm/bin/classes:/var/tmp/Work/Work/JDK/NIGHTLY/Gc_Baseline-Xconc/solaris-sparc/lib/tools.jar
HOME=/var/tmp
RAS_OPTIONS=
LD_LIBRARY_PATH=/net/vmsqe.sfbay/export/backup/testbase/testbase_vm.1.6_r02/vm/bin/lib/sparc/nsk/jvmti/ClearBreakpoint:/net/vmsqe.sfbay/export/backup/testbase/testbase_vm.1.6_r02/vm/src/nsk/share/lib/sparc:/var/tmp/Work/Work/JDK/NIGHTLY/Gc_Baseline-Xconc/solaris-sparc/jre/lib/sparc/server
PATH=/var/tmp/Work/Work/JDK/NIGHTLY/Gc_Baseline-Xconc/solaris-sparc/bin:/bin:/usr/bin:/var/tmp/Work/Work/JDK/NIGHTLY/Gc_Baseline-Xconc/solaris-sparc/jre/bin
DISPLAY=vmsqe.sfbay:0.0
SHELL=/usr/bin/sh

while [ $# -gt 0 ];
do
  if [ $1 = "-jdk" ]; then
shift 1
PATH=${1}/bin:${PATH}
shift 1
  else
if [ $1 = "-d" ]; then
shift 1
if [ $# -gt 0 ]; then
DISPLAY=$1
shift 1
else
DISPLAY=:0.0
fi
fi
  fi
done

export CLASSPATH
export HOME
export RAS_OPTIONS
export LD_LIBRARY_PATH
export PATH
export DISPLAY
export SHELL

#annotate TEST javaopt=/var/tmp/Work/Work/JDK/NIGHTLY/Gc_Baseline-Xconc/solaris-sparc/bin/java -server -Xmixed -XX:-PrintVMOptions -XX:+UseConcMarkSweepGC -XX:+CMSPermGenSweepingEnabled -XX:+CMSClassUnloadingEnabled -XX:+ExplicitGCInvokesConcurrent -agentlib:clrbrk001
/usr/bin/perl /net/vmsqe.sfbay/export/backup/testbase/testbase_vm.1.6_r02/vm/src/nsk/share/jvmti/run_jvmti.pl /var/tmp/Work/Work/JDK/NIGHTLY/Gc_Baseline-Xconc/solaris-sparc/bin/java -server -Xmixed -DHANGINGJAVA10039 -XX:-PrintVMOptions -XX:+UseConcMarkSweepGC -XX:+CMSPermGenSweepingEnabled -XX:+CMSClassUnloadingEnabled -XX:+ExplicitGCInvokesConcurrent -agentlib:clrbrk001 nsk.jvmti.ClearBreakpoint.clrbrk001
##Exit status of execution step=6
##Core file exists
##!checkExitCode

## To suppress the following error report, specify this argument
## after -XX: or in .hotspotrc: SuppressErrorAt=/mutexLocker.cpp:99]
##
## An unexpected error has been detected by Java Runtime Environment:
##
## Internal Error (/net/prt-solsparc-q1-19/tmp/PrtBuildDir/workspace/src/share/vm/runtime/mutexLocker.cpp, 99 [ Patched ]), pid=14945, tid=14
##
## Java VM: Java HotSpot(TM) Server VM (20051123161237.pbk.gc2main-debug mixed mode)
##
## Error: must own lock Heap_lock
## An error report file with more information is saved as hs_err_pid14945.log
##
## If you would like to submit a bug report, please visit:
## http://java.sun.com/webapps/bugreport/crash.jsp
##
#VM option '-PrintVMOptions'
#VM option '+UseConcMarkSweepGC'
#VM option '+CMSPermGenSweepingEnabled'
#VM option '+CMSClassUnloadingEnabled'
#VM option '+ExplicitGCInvokesConcurrent'
#Current thread is 14
#Dumping core ...


-----

nsk.jvmti.ClearBreakpoint.clrbrk001

nsk/jvmti/ClearBreakpoint/clrbrk001

-----
http://sqeweb.sfbay.sun.com/nfs/tools/gtee/results/JDK7/NIGHTLY/VM/2010-07-29/GC_Baseline-Xconc/known_failures.html

nsk/jvmti/ClearBreakpoint/clrbrk001
nsk/jvmti/scenarios/hotswap/HS203/hs203t004
Here is an instance of this assertion failure from the
2010.08.30 Main_Baseline nightly:

# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/mutexLocker.cpp:136
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/tmp/jprt/P1/B/170631.ap31282/source/src/share/vm/runtime/mutexLocker.cpp:136), pid=8585, tid=3072199568
# fatal error: must own lock Heap_lock
#
# JRE version: 7.0
# Java VM: Java HotSpot(TM) Client VM (19.0-b06-201008301706.ap31282.hs-merge-fastdebug mixed mode linux-x86 )
# An error report file with more information is saved as:
# /net/sqenfs-2.sfbay/export2/results/vm/gtee/JDK7/NIGHTLY/VM/2010-08-30/Main_Baseline/javase/linux-i586/client/mixed/linux-i586_javase_client_mixed_JT_JDK_com_sun_jdi/workDir/com/sun/jdi/BreakpointTest/hs_err_pid8585.log
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
#

http://sqeweb.sfbay/nfs/tools/gtee/results/JDK7/NIGHTLY/VM/2010-08-30/Main_Baseline/javase/linux-i586/client/mixed/linux-i586_javase_client_mixed_JT_JDK_com_sun_jdi/analysis.html

The formatting of the message has changed from earlier entries.
com/sun/jdi/GetLocalVariables4Test.sh
com/sun/jdi/SimulResumerTest.java