RAS VM test framework crashes with nsk JVMTIagent attached. Exact point of crash differ from time to time. See attachment for details.

PS sources of JVMTIAgent located inside src/nsk/share in VM testbase
In October 2005 when I took a look into this bug I observed several failure modes.

1. One of them looked like a compiler issue, but now it is not reproducible anymore.
   I guess, this problem has been already fixed.
#
# An unexpected error has been detected by HotSpot Virtual Machine:
#
# Internal Error (/net/prt-solsparc-q1-16/tmp/PrtBuildDir/workspace/src/share/vm/code/nmethod.cpp, 1514 [ Patched ]), pid=12802, tid=1199
#
# Java VM: Java HotSpot(TM) Server VM (20051013170524.lewy.hotspot-debug compiled mode)
#
# Error: unhandled implicit exception in compiled code

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

Current thread (0x001dff00): JavaThread "Thread-1187" [_thread_in_Java, id=1199]

Stack: [0xf0e40000,0xf0e80000), sp=0xf0e7f058, free space=252k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0xf9f224];; void VMError::report_and_die()+0x7c8
V [libjvm.so+0x475f44];; void report_fatal(const char*,int,const char*)+0x6c
V [libjvm.so+0xc40fe0];; unsigned char*nmethod::continuation_for_implicit_exception(unsigned char*)+0x230
V [libjvm.so+0xddadec];; unsigned char*SharedRuntime::continuation_for_implicit_exception(JavaThread*,unsigned char*,SharedRuntime::ImplicitExceptionKind)+0x2d4
V [libjvm.so+0xc8aaec];; JVM_handle_solaris_signal+0x750
C [libc.so.1+0xbc534];; __sighndlr+0x14
C [libc.so.1+0xb19a0];; call_user_handler+0x3c0
J multistress.WorkThread.run()V
v ~StubRoutines::call_stub
V [libjvm.so+0x645a20];; void JavaCalls::call_helper(JavaValue*,methodHandle*,JavaCallArguments*,Thread*)+0xaf4
V [libjvm.so+0x643acc];; void JavaCalls::call_virtual(JavaValue*,KlassHandle,symbolHandle,symbolHandle,JavaCallArguments*,Thread*)+0x438
V [libjvm.so+0x643c7c];; void JavaCalls::call_virtual(JavaValue*,Handle,KlassHandle,symbolHandle,symbolHandle,Thread*)+0xfc
V [libjvm.so+0x825bac];; void thread_entry(JavaThread*,Thread*)+0x2c8
V [libjvm.so+0xeaf9a0];; void JavaThread::thread_main_inner()+0x228
V [libjvm.so+0xc7ef00];; java_start+0x144

2. The second failure mode with this stress test case looked like a JNI handle
   issue (below). Now it is not reproducible as well.

#
# An unexpected error has been detected by HotSpot Virtual Machine:
#
# SIGSEGV (0xb) at pc=0xfd9c94c4, pid=10073, tid=2984
#
# Java VM: Java HotSpot(TM) Server VM (20051013144526.lewy.e-debug mixed mode)
# Problematic frame:
# V [libjvm.so+0x5c94c4]
 ....
Stack: [0xef080000,0xef17c000), sp=0xef17bb90, free space=1006k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x5c94c4];; oop CollectedHeap::obj_allocate(KlassHandle,int,Thread*)+0x1f8
V [libjvm.so+0x5aa528];; instanceOop instanceKlass::allocate_instance(Thread*)+0x1f8
V [libjvm.so+0x2337ec];; instanceHandle instanceKlass::allocate_instance_handle(Thread*)+0x2c
V [libjvm.so+0xeacf38];; void JavaThread::allocate_threadObj(Handle,char*,bool,Thread*)+0x49c
V [libjvm.so+0x74bf88];; jni_AttachCurrentThread+0x4c0
C [libnative.so+0x5cc];; zzz+0x64
[error occurred during error reporting, step 120, id 0xb]

3. The third failure mode is a naked oop issue in the JVM_InvokeMethod function.
   Now it is the only failure mode left.
   It is reproducible on Solaris sparc/x86 with both Client and Server VM.
   This stack trace below:

#
# An unexpected error has been detected by Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0xddf74be5, pid=20269, tid=3373
#
# Java VM: Java HotSpot(TM) Client VM (1.6.0-internal-debug mixed mode)
# Problematic frame:
# V [libjvm.so+0x374be5]
#
# 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 (0x082e4c00): JavaThread "Thread-3361" [_thread_in_vm, id=3373]

siginfo:si_signo=11, si_errno=0, si_code=1, si_addr=0xbaadbac6;;
;; si_signo=11 SIGSEGV
;; si_code=1 SEGV_MAPERR /* Address not mapped to object. */

Registers:
EAX=0x00000008, EBX=0xdece1bf0, ECX=0xbaadbabe, EDX=0x000000ab
ESP=0xd290fb94, EBP=0xd290fbb8, ESI=0x082e4c00, EDI=0xd290fc60
EIP=0xddf74be5, EFLAGS=0x00010296

Top of Stack: (sp=0xd290fb94)
0xd290fb94: ded1170f 082e4c00 dece1bf0 d76442b0
0xd290fba4: d7400d60 ddf84248 dece1bf0 d290fc48
0xd290fbb4: d290fc74 d290fc74 de09c03d d290fc60
0xd290fbc4: 082e4c00 d762b6d8 def72000 d290fd90
0xd290fbd4: db815d94 d290fdbc d290fd90 db815d94
0xd290fbe4: ded25cac ded2e640 ded117b7 d2910d94
0xd290fbf4: 00001000 00000001 00000000 de3f0300
0xd290fc04: ded193f8 d34dc6e8 d34dc6e8 fefefefe

Instructions: (pc=0xddf74be5)
0xddf74bd5: d0 d6 00 8b 7d 08 8b 0f 8b 83 9c 25 00 00 8b 00
0xddf74be5: 8b 04 01 89 45 f4 8b b3 20 00 00 00 80 3e 00 75
#
# An unexpected error has been detected by Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0xddf74be5, pid=20269, tid=3373
#
# Java VM: Java HotSpot(TM) Client VM (1.6.0-internal-debug mixed mode)
# Problematic frame:
# V [libjvm.so+0x374be5]
#
# 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 (0x082e4c00): JavaThread "Thread-3361" [_thread_in_vm, id=3373]

siginfo:si_signo=11, si_errno=0, si_code=1, si_addr=0xbaadbac6;;
;; si_signo=11 SIGSEGV
;; si_code=1 SEGV_MAPERR /* Address not mapped to object. */

Registers:
EAX=0x00000008, EBX=0xdece1bf0, ECX=0xbaadbabe, EDX=0x000000ab
ESP=0xd290fb94, EBP=0xd290fbb8, ESI=0x082e4c00, EDI=0xd290fc60
EIP=0xddf74be5, EFLAGS=0x00010296

Top of Stack: (sp=0xd290fb94)
0xd290fb94: ded1170f 082e4c00 dece1bf0 d76442b0
0xd290fba4: d7400d60 ddf84248 dece1bf0 d290fc48
0xd290fbb4: d290fc74 d290fc74 de09c03d d290fc60
0xd290fbc4: 082e4c00 d762b6d8 def72000 d290fd90
0xd290fbd4: db815d94 d290fdbc d290fd90 db815d94
0xd290fbe4: ded25cac ded2e640 ded117b7 d2910d94
0xd290fbf4: 00001000 00000001 00000000 de3f0300
0xd290fc04: ded193f8 d34dc6e8 d34dc6e8 fefefefe

Instructions: (pc=0xddf74be5)
0xddf74bd5: d0 d6 00 8b 7d 08 8b 0f 8b 83 9c 25 00 00 8b 00
0xddf74be5: 8b 04 01 89 45 f4 8b b3 20 00 00 00 80 3e 00 75
;; ddf74bd5 d0 d6 rcl %dh
;; ddf74bd7 00 8b 7d 08 8b 0f add %cl,0xf8b087d(%ebx)
;; ddf74bdd 8b 83 9c 25 00 00 mov 0x259c(%ebx),%eax
;; ddf74be3 8b 00 mov (%eax),%eax
;; ---------------
;; ddf74be5 8b 04 01 mov (%ecx,%eax,1),%eax
;; ddf74be8 89 45 f4 mov %eax,0xfffffff4(%ebp)
;; ddf74beb 8b b3 20 00 00 00 mov 0x20(%ebx),%esi
;; ddf74bf1 80 3e 00 cmpb $0x0,(%esi)
;; ddf74bf4 75 ff jne 0xddf74bf5
;;
Stack: [0xd28c1000,0xd2910d94), sp=0xd290fb94, free space=314k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x374be5];; bool java_lang_Class::is_primitive(oop)+0x25
V [libjvm.so+0x49c03d];; JVM_InvokeMethod+0xb31
C [libjava.so+0xe81b] Java_sun_reflect_NativeMethodAccessorImpl_invoke0+0x27;; Java_sun_reflect_NativeMethodAccessorImpl_invoke0+0x27
j sun.reflect.NativeMethodAccessorImpl.invoke0(Ljava/lang/reflect/Method;Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+0
j sun.reflect.NativeMethodAccessorImpl.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+87
j sun.reflect.DelegatingMethodAccessorImpl.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+6
j java.lang.reflect.Method.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+111
j multistress.Tester_2.test(I)V+76
v ~StubRoutines::call_stub
V [libjvm.so+0x36f176];; void JavaCalls::call_helper(JavaValue*,methodHandle*,JavaCallArguments*,Thread*)+0x68a
V [libjvm.so+0x707407];; void os::os_exception_wrapper(void(*)(JavaValue*,methodHandle*,JavaCallArguments*,Thread*),JavaValue*,methodHandle*,JavaCallArguments*,Thread*)+0x27
V [libjvm.so+0x36eac0];; void JavaCalls::call(JavaValue*,methodHandle,JavaCallArguments*,Thread*)+0x40
V [libjvm.so+0x76117d];; oop Reflection::invoke(instanceKlassHandle,methodHandle,Handle,bool,objArrayHandle,BasicType,objArrayHandle,bool,Thread*)+0x2a7d
V [libjvm.so+0x76eb73];; oop Reflection::invoke_method(oop,Handle,objArrayHandle,Thread*)+0x947
V [libjvm.so+0x49bdec];; JVM_InvokeMethod+0x8e0
C [libjava.so+0xe81b] Java_sun_reflect_NativeMethodAccessorImpl_invoke0+0x27;; Java_sun_reflect_NativeMethodAccessorImpl_invoke0+0x27
j sun.reflect.NativeMethodAccessorImpl.invoke0(Ljava/lang/reflect/Method;Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+0
j sun.reflect.NativeMethodAccessorImpl.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+87
j sun.reflect.DelegatingMethodAccessorImpl.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+6
j java.lang.reflect.Method.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+111
j multistress.RecursiveClassLoading.run()V+67
j multistress.WeightThread.run()V+9
v ~StubRoutines::call_stub
V [libjvm.so+0x36f176];; void JavaCalls::call_helper(JavaValue*,methodHandle*,JavaCallArguments*,Thread*)+0x68a
V [libjvm.so+0x707407];; void os::os_exception_wrapper(void(*)(JavaValue*,methodHandle*,JavaCallArguments*,Thread*),JavaValue*,methodHandle*,JavaCallArguments*,Thread*)+0x27
V [libjvm.so+0x36eac0];; void JavaCalls::call(JavaValue*,methodHandle,JavaCallArguments*,Thread*)+0x40
V [libjvm.so+0x36dde2];; void JavaCalls::call_virtual(JavaValue*,KlassHandle,symbolHandle,symbolHandle,JavaCallArguments*,Thread*)+0x2b2
V [libjvm.so+0x36dff4];; void JavaCalls::call_virtual(JavaValue*,Handle,KlassHandle,symbolHandle,symbolHandle,Thread*)+0xd0
V [libjvm.so+0x4764ad];; void thread_entry(JavaThread*,Thread*)+0x211
V [libjvm.so+0x81b9b2];; void JavaThread::thread_main_inner()+0x16e
V [libjvm.so+0x81b75c];; void JavaThread::run()+0x348
V [libjvm.so+0x7020bb];; java_start+0xe3

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j sun.reflect.NativeMethodAccessorImpl.invoke0(Ljava/lang/reflect/Method;Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+0
j sun.reflect.NativeMethodAccessorImpl.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+87
j sun.reflect.DelegatingMethodAccessorImpl.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+6
j java.lang.reflect.Method.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+111
j multistress.Tester_2.test(I)V+76
v ~StubRoutines::call_stub
j sun.reflect.NativeMethodAccessorImpl.invoke0(Ljava/lang/reflect/Method;Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+0
j sun.reflect.NativeMethodAccessorImpl.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+87
j sun.reflect.DelegatingMethodAccessorImpl.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+6
j java.lang.reflect.Method.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+111
j multistress.RecursiveClassLoading.run()V+67
j multistress.WeightThread.run()V+9
v ~StubRoutines::call_stub

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

Java Threads: ( => current thread )
=>0x082e4c00 JavaThread "Thread-3361" [_thread_in_vm, id=3373]
  0x081bb000 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=10]
  0x081b8c00 JavaThread "CompilerThread0" daemon [_thread_in_native, id=9]
  0x081b7000 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=8]
  0x0819c400 JavaThread "Finalizer" daemon [_thread_blocked, id=7]
  0x0819b000 JavaThread "Reference Handler" daemon [_thread_blocked, id=6]
  0x08087800 JavaThread "main" [_thread_blocked, id=4]

Other Threads:
  0x08195c00 VMThread [id=5]
  0x081bd400 WatcherThread [id=11]

VM state:not at safepoint (normal execution)

VM Mutex/Monitor currently owned by a thread: None

Heap
...

Dynamic libraries:
0x08050000 /net/tomsk.sfbay/export/home/ss45998/1.5/hs_jref.b72/i386/jdk1.6.0/bin/java
0xdfb60000 /usr/lib/libthread.so.1
0xdfb40000 /net/tomsk.sfbay/export/home/ss45998/1.5/hs_jref.b72/i386/jdk1.6.0/bin/../jre/lib/i386/jli/libjli.so
0xdfb30000 /usr/lib/libdl.so.1
0xdfa70000 /usr/lib/libc.so.1
0xddc00000 /net/tomsk.sfbay/export/home/ss45998/1.5/hs_jref.b72/i386/jdk1.6.0/jre/lib/i386/client/libjvm.so
0xdfa30000 /usr/lib/libsocket.so.1
0xdfa00000 /usr/lib/libsched.so.1
0xdf9d0000 /usr/lib/libCrun.so.1
0xdf9b0000 /usr/lib/libm.so.1
0xdf990000 /usr/lib/libdoor.so.1
0xdf8e0000 /usr/lib/libnsl.so.1
0xdf8c0000 /usr/lib/libmp.so.2
0xdefe0000 /net/tomsk.sfbay/export/home/ss45998/1.5/hs_jref.b72/i386/jdk1.6.0/jre/lib/i386/native_threads/libhpi.so
0xdefa0000 libs/solaris-i586/libJVMTIagent.so
0xdef80000 /net/tomsk.sfbay/export/home/ss45998/1.5/hs_jref.b72/i386/jdk1.6.0/jre/lib/i386/libverify.so
0xdef40000 /net/tomsk.sfbay/export/home/ss45998/1.5/hs_jref.b72/i386/jdk1.6.0/jre/lib/i386/libjava.so
0xdef10000 /net/tomsk.sfbay/export/home/ss45998/1.5/hs_jref.b72/i386/jdk1.6.0/jre/lib/i386/libzip.so

VM Arguments:
jvm_args: -agentlib:JVMTIagent
java_command: multistress.Main --multistress.Main.TIMEOUT=60000
Launcher Type: SUN_STANDARD

Environment Variables:
JAVA_HOME=/usr/j2se
CLASSPATH=/usr/j2se/lib:.
PATH=/usr/ccs/bin:/usr/bin:/usr/sbin:/home/ss45998/bin:/home/ss45998/bin/intel-S2:/usr/dt/bin:/usr/dist/exe:/usr/openwin/bin:/java/devtools/i386/SUNWspro/SS11/bin:/java/devtools/i386/SUNWspro/SS11/bin:/java/devtools/i386/SUNWspro/SS10/bin:/java/devtools/i386/SUNWspro/SOS8/bin:/java/devtools/i386/bin:/usr/dist/share/forte_dev_i386/SUNWspro/bin:/net/jano.sfbay/export/disk20/serviceability/tools/bin:/usr/lib:/usr/ucb:/sbin:/etc:.
LD_LIBRARY_PATH=/net/tomsk.sfbay/export/home/ss45998/1.5/hs_jref.b72/i386/jdk1.6.0/jre/lib/i386/client:/net/tomsk.sfbay/export/home/ss45998/1.5/hs_jref.b72/i386/jdk1.6.0/jre/lib/i386:/net/tomsk.sfbay/export/home/ss45998/1.5/hs_jref.b72/i386/jdk1.6.0/jre/../lib/i386:libs/solaris-i586
SHELL=/bin/csh
DISPLAY=bratsk:1.0
...

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

OS: Solaris 8 2/02 s28x_u7wos_08a INTEL
           Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
                           Assembled 18 December 2001

uname:SunOS 5.8 Generic_117351-32 i86pc (T1 libthread)
rlimit: STACK 8480k, CORE 0k, NOFILE 1024, AS infinity
load average:5.48 4.59 4.47

CPU:total 2 family 15, cmov, cx8, fxsr, mmx, mmxext, 3dnowext, 3dnow

Memory: 4k page, physical 2096700k(1673968k free)

vm_info: Java HotSpot(TM) Client VM (1.6.0-internal) for solaris-x86, built on Mar 3 2006 14:29:58 by "ss45998" with unknown Workshop:0x580