Wed, 12 Jun 2013 11:17:39 +0200
8016131: nsk/sysdict/vm/stress/chain tests crash the VM in 'entry_frame_is_first()'
Reviewed-by: jrose, kvn, mgronlun
1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
25 #include "precompiled.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "compiler/compileBroker.hpp"
29 #include "compiler/compilerOracle.hpp"
30 #include "gc_implementation/shared/isGCActiveMark.hpp"
31 #include "memory/resourceArea.hpp"
32 #include "oops/symbol.hpp"
33 #include "runtime/arguments.hpp"
34 #include "runtime/deoptimization.hpp"
35 #include "runtime/interfaceSupport.hpp"
36 #include "runtime/sweeper.hpp"
37 #include "runtime/thread.inline.hpp"
38 #include "runtime/vm_operations.hpp"
39 #include "services/threadService.hpp"
40 #include "trace/tracing.hpp"
42 #define VM_OP_NAME_INITIALIZE(name) #name,
44 const char* VM_Operation::_names[VM_Operation::VMOp_Terminating] = \
45 { VM_OPS_DO(VM_OP_NAME_INITIALIZE) };
47 void VM_Operation::set_calling_thread(Thread* thread, ThreadPriority priority) {
48 _calling_thread = thread;
49 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check");
50 _priority = priority;
51 }
54 void VM_Operation::evaluate() {
55 ResourceMark rm;
56 if (TraceVMOperation) {
57 tty->print("[");
58 NOT_PRODUCT(print();)
59 }
60 doit();
61 if (TraceVMOperation) {
62 tty->print_cr("]");
63 }
64 }
66 const char* VM_Operation::mode_to_string(Mode mode) {
67 switch(mode) {
68 case _safepoint : return "safepoint";
69 case _no_safepoint : return "no safepoint";
70 case _concurrent : return "concurrent";
71 case _async_safepoint: return "async safepoint";
72 default : return "unknown";
73 }
74 }
75 // Called by fatal error handler.
76 void VM_Operation::print_on_error(outputStream* st) const {
77 st->print("VM_Operation (" PTR_FORMAT "): ", this);
78 st->print("%s", name());
80 const char* mode = mode_to_string(evaluation_mode());
81 st->print(", mode: %s", mode);
83 if (calling_thread()) {
84 st->print(", requested by thread " PTR_FORMAT, calling_thread());
85 }
86 }
88 void VM_ThreadStop::doit() {
89 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
90 JavaThread* target = java_lang_Thread::thread(target_thread());
91 // Note that this now allows multiple ThreadDeath exceptions to be
92 // thrown at a thread.
93 if (target != NULL) {
94 // the thread has run and is not already in the process of exiting
95 target->send_thread_stop(throwable());
96 }
97 }
99 void VM_Deoptimize::doit() {
100 // We do not want any GCs to happen while we are in the middle of this VM operation
101 ResourceMark rm;
102 DeoptimizationMarker dm;
104 // Deoptimize all activations depending on marked nmethods
105 Deoptimization::deoptimize_dependents();
107 // Make the dependent methods zombies
108 CodeCache::make_marked_nmethods_zombies();
109 }
112 VM_DeoptimizeFrame::VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id) {
113 _thread = thread;
114 _id = id;
115 }
118 void VM_DeoptimizeFrame::doit() {
119 Deoptimization::deoptimize_frame_internal(_thread, _id);
120 }
123 #ifndef PRODUCT
125 void VM_DeoptimizeAll::doit() {
126 DeoptimizationMarker dm;
127 // deoptimize all java threads in the system
128 if (DeoptimizeALot) {
129 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
130 if (thread->has_last_Java_frame()) {
131 thread->deoptimize();
132 }
133 }
134 } else if (DeoptimizeRandom) {
136 // Deoptimize some selected threads and frames
137 int tnum = os::random() & 0x3;
138 int fnum = os::random() & 0x3;
139 int tcount = 0;
140 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
141 if (thread->has_last_Java_frame()) {
142 if (tcount++ == tnum) {
143 tcount = 0;
144 int fcount = 0;
145 // Deoptimize some selected frames.
146 // Biased llocking wants a updated register map
147 for(StackFrameStream fst(thread, UseBiasedLocking); !fst.is_done(); fst.next()) {
148 if (fst.current()->can_be_deoptimized()) {
149 if (fcount++ == fnum) {
150 fcount = 0;
151 Deoptimization::deoptimize(thread, *fst.current(), fst.register_map());
152 }
153 }
154 }
155 }
156 }
157 }
158 }
159 }
162 void VM_ZombieAll::doit() {
163 JavaThread *thread = (JavaThread *)calling_thread();
164 assert(thread->is_Java_thread(), "must be a Java thread");
165 thread->make_zombies();
166 }
168 #endif // !PRODUCT
170 void VM_UnlinkSymbols::doit() {
171 JavaThread *thread = (JavaThread *)calling_thread();
172 assert(thread->is_Java_thread(), "must be a Java thread");
173 SymbolTable::unlink();
174 }
176 void VM_HandleFullCodeCache::doit() {
177 NMethodSweeper::speculative_disconnect_nmethods(_is_full);
178 }
180 void VM_Verify::doit() {
181 Universe::heap()->prepare_for_verify();
182 Universe::verify(_silent);
183 }
185 bool VM_PrintThreads::doit_prologue() {
186 assert(Thread::current()->is_Java_thread(), "just checking");
188 // Make sure AbstractOwnableSynchronizer is loaded
189 if (JDK_Version::is_gte_jdk16x_version()) {
190 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
191 }
193 // Get Heap_lock if concurrent locks will be dumped
194 if (_print_concurrent_locks) {
195 Heap_lock->lock();
196 }
197 return true;
198 }
200 void VM_PrintThreads::doit() {
201 Threads::print_on(_out, true, false, _print_concurrent_locks);
202 }
204 void VM_PrintThreads::doit_epilogue() {
205 if (_print_concurrent_locks) {
206 // Release Heap_lock
207 Heap_lock->unlock();
208 }
209 }
211 void VM_PrintJNI::doit() {
212 JNIHandles::print_on(_out);
213 }
215 VM_FindDeadlocks::~VM_FindDeadlocks() {
216 if (_deadlocks != NULL) {
217 DeadlockCycle* cycle = _deadlocks;
218 while (cycle != NULL) {
219 DeadlockCycle* d = cycle;
220 cycle = cycle->next();
221 delete d;
222 }
223 }
224 }
226 bool VM_FindDeadlocks::doit_prologue() {
227 assert(Thread::current()->is_Java_thread(), "just checking");
229 // Load AbstractOwnableSynchronizer class
230 if (_concurrent_locks && JDK_Version::is_gte_jdk16x_version()) {
231 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
232 }
234 return true;
235 }
237 void VM_FindDeadlocks::doit() {
238 _deadlocks = ThreadService::find_deadlocks_at_safepoint(_concurrent_locks);
239 if (_out != NULL) {
240 int num_deadlocks = 0;
241 for (DeadlockCycle* cycle = _deadlocks; cycle != NULL; cycle = cycle->next()) {
242 num_deadlocks++;
243 cycle->print_on(_out);
244 }
246 if (num_deadlocks == 1) {
247 _out->print_cr("\nFound 1 deadlock.\n");
248 _out->flush();
249 } else if (num_deadlocks > 1) {
250 _out->print_cr("\nFound %d deadlocks.\n", num_deadlocks);
251 _out->flush();
252 }
253 }
254 }
256 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result,
257 int max_depth,
258 bool with_locked_monitors,
259 bool with_locked_synchronizers) {
260 _result = result;
261 _num_threads = 0; // 0 indicates all threads
262 _threads = NULL;
263 _result = result;
264 _max_depth = max_depth;
265 _with_locked_monitors = with_locked_monitors;
266 _with_locked_synchronizers = with_locked_synchronizers;
267 }
269 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result,
270 GrowableArray<instanceHandle>* threads,
271 int num_threads,
272 int max_depth,
273 bool with_locked_monitors,
274 bool with_locked_synchronizers) {
275 _result = result;
276 _num_threads = num_threads;
277 _threads = threads;
278 _result = result;
279 _max_depth = max_depth;
280 _with_locked_monitors = with_locked_monitors;
281 _with_locked_synchronizers = with_locked_synchronizers;
282 }
284 bool VM_ThreadDump::doit_prologue() {
285 assert(Thread::current()->is_Java_thread(), "just checking");
287 // Load AbstractOwnableSynchronizer class before taking thread snapshots
288 if (JDK_Version::is_gte_jdk16x_version()) {
289 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
290 }
292 if (_with_locked_synchronizers) {
293 // Acquire Heap_lock to dump concurrent locks
294 Heap_lock->lock();
295 }
297 return true;
298 }
300 void VM_ThreadDump::doit_epilogue() {
301 if (_with_locked_synchronizers) {
302 // Release Heap_lock
303 Heap_lock->unlock();
304 }
305 }
307 void VM_ThreadDump::doit() {
308 ResourceMark rm;
310 ConcurrentLocksDump concurrent_locks(true);
311 if (_with_locked_synchronizers) {
312 concurrent_locks.dump_at_safepoint();
313 }
315 if (_num_threads == 0) {
316 // Snapshot all live threads
317 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) {
318 if (jt->is_exiting() ||
319 jt->is_hidden_from_external_view()) {
320 // skip terminating threads and hidden threads
321 continue;
322 }
323 ThreadConcurrentLocks* tcl = NULL;
324 if (_with_locked_synchronizers) {
325 tcl = concurrent_locks.thread_concurrent_locks(jt);
326 }
327 ThreadSnapshot* ts = snapshot_thread(jt, tcl);
328 _result->add_thread_snapshot(ts);
329 }
330 } else {
331 // Snapshot threads in the given _threads array
332 // A dummy snapshot is created if a thread doesn't exist
333 for (int i = 0; i < _num_threads; i++) {
334 instanceHandle th = _threads->at(i);
335 if (th() == NULL) {
336 // skip if the thread doesn't exist
337 // Add a dummy snapshot
338 _result->add_thread_snapshot(new ThreadSnapshot());
339 continue;
340 }
342 // Dump thread stack only if the thread is alive and not exiting
343 // and not VM internal thread.
344 JavaThread* jt = java_lang_Thread::thread(th());
345 if (jt == NULL || /* thread not alive */
346 jt->is_exiting() ||
347 jt->is_hidden_from_external_view()) {
348 // add a NULL snapshot if skipped
349 _result->add_thread_snapshot(new ThreadSnapshot());
350 continue;
351 }
352 ThreadConcurrentLocks* tcl = NULL;
353 if (_with_locked_synchronizers) {
354 tcl = concurrent_locks.thread_concurrent_locks(jt);
355 }
356 ThreadSnapshot* ts = snapshot_thread(jt, tcl);
357 _result->add_thread_snapshot(ts);
358 }
359 }
360 }
362 ThreadSnapshot* VM_ThreadDump::snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl) {
363 ThreadSnapshot* snapshot = new ThreadSnapshot(java_thread);
364 snapshot->dump_stack_at_safepoint(_max_depth, _with_locked_monitors);
365 snapshot->set_concurrent_locks(tcl);
366 return snapshot;
367 }
369 volatile bool VM_Exit::_vm_exited = false;
370 Thread * VM_Exit::_shutdown_thread = NULL;
372 int VM_Exit::set_vm_exited() {
373 Thread * thr_cur = ThreadLocalStorage::get_thread_slow();
375 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already");
377 int num_active = 0;
379 _shutdown_thread = thr_cur;
380 _vm_exited = true; // global flag
381 for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next())
382 if (thr!=thr_cur && thr->thread_state() == _thread_in_native) {
383 ++num_active;
384 thr->set_terminated(JavaThread::_vm_exited); // per-thread flag
385 }
387 return num_active;
388 }
390 int VM_Exit::wait_for_threads_in_native_to_block() {
391 // VM exits at safepoint. This function must be called at the final safepoint
392 // to wait for threads in _thread_in_native state to be quiescent.
393 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already");
395 Thread * thr_cur = ThreadLocalStorage::get_thread_slow();
396 Monitor timer(Mutex::leaf, "VM_Exit timer", true);
398 // Compiler threads need longer wait because they can access VM data directly
399 // while in native. If they are active and some structures being used are
400 // deleted by the shutdown sequence, they will crash. On the other hand, user
401 // threads must go through native=>Java/VM transitions first to access VM
402 // data, and they will be stopped during state transition. In theory, we
403 // don't have to wait for user threads to be quiescent, but it's always
404 // better to terminate VM when current thread is the only active thread, so
405 // wait for user threads too. Numbers are in 10 milliseconds.
406 int max_wait_user_thread = 30; // at least 300 milliseconds
407 int max_wait_compiler_thread = 1000; // at least 10 seconds
409 int max_wait = max_wait_compiler_thread;
411 int attempts = 0;
412 while (true) {
413 int num_active = 0;
414 int num_active_compiler_thread = 0;
416 for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next()) {
417 if (thr!=thr_cur && thr->thread_state() == _thread_in_native) {
418 num_active++;
419 if (thr->is_Compiler_thread()) {
420 num_active_compiler_thread++;
421 }
422 }
423 }
425 if (num_active == 0) {
426 return 0;
427 } else if (attempts > max_wait) {
428 return num_active;
429 } else if (num_active_compiler_thread == 0 && attempts > max_wait_user_thread) {
430 return num_active;
431 }
433 attempts++;
435 MutexLockerEx ml(&timer, Mutex::_no_safepoint_check_flag);
436 timer.wait(Mutex::_no_safepoint_check_flag, 10);
437 }
438 }
440 void VM_Exit::doit() {
441 CompileBroker::set_should_block();
443 // Wait for a short period for threads in native to block. Any thread
444 // still executing native code after the wait will be stopped at
445 // native==>Java/VM barriers.
446 // Among 16276 JCK tests, 94% of them come here without any threads still
447 // running in native; the other 6% are quiescent within 250ms (Ultra 80).
448 wait_for_threads_in_native_to_block();
450 set_vm_exited();
452 // cleanup globals resources before exiting. exit_globals() currently
453 // cleans up outputStream resources and PerfMemory resources.
454 exit_globals();
456 // Check for exit hook
457 exit_hook_t exit_hook = Arguments::exit_hook();
458 if (exit_hook != NULL) {
459 // exit hook should exit.
460 exit_hook(_exit_code);
461 // ... but if it didn't, we must do it here
462 vm_direct_exit(_exit_code);
463 } else {
464 vm_direct_exit(_exit_code);
465 }
466 }
469 void VM_Exit::wait_if_vm_exited() {
470 if (_vm_exited &&
471 ThreadLocalStorage::get_thread_slow() != _shutdown_thread) {
472 // _vm_exited is set at safepoint, and the Threads_lock is never released
473 // we will block here until the process dies
474 Threads_lock->lock_without_safepoint_check();
475 ShouldNotReachHere();
476 }
477 }