1 /*
2 * Copyright (c) 2003, 2016, 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.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include <fcntl.h>
26 #include "precompiled.hpp"
27 #include "code/codeCache.hpp"
28 #include "compiler/compileBroker.hpp"
29 #include "compiler/disassembler.hpp"
30 #include "gc/shared/collectedHeap.hpp"
31 #include "logging/logConfiguration.hpp"
32 #include "prims/whitebox.hpp"
33 #include "runtime/arguments.hpp"
34 #include "runtime/atomic.hpp"
35 #include "runtime/frame.inline.hpp"
36 #include "runtime/init.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/thread.inline.hpp"
39 #include "runtime/vmThread.hpp"
40 #include "runtime/vm_operations.hpp"
41 #include "services/memTracker.hpp"
42 #include "trace/traceMacros.hpp"
43 #include "utilities/debug.hpp"
44 #include "utilities/decoder.hpp"
45 #include "utilities/defaultStream.hpp"
46 #include "utilities/errorReporter.hpp"
47 #include "utilities/events.hpp"
48 #include "utilities/vmError.hpp"
49
50 // List of environment variables that should be reported in error log file.
51 const char *env_list[] = {
52 // All platforms
53 "JAVA_HOME", "JRE_HOME", "JAVA_TOOL_OPTIONS", "_JAVA_OPTIONS", "CLASSPATH",
54 "JAVA_COMPILER", "PATH", "USERNAME",
55
56 // Env variables that are defined on Solaris/Linux/BSD
57 "LD_LIBRARY_PATH", "LD_PRELOAD", "SHELL", "DISPLAY",
58 "HOSTTYPE", "OSTYPE", "ARCH", "MACHTYPE",
59
60 // defined on Linux
61 "LD_ASSUME_KERNEL", "_JAVA_SR_SIGNUM",
62
63 // defined on Darwin
64 "DYLD_LIBRARY_PATH", "DYLD_FALLBACK_LIBRARY_PATH",
65 "DYLD_FRAMEWORK_PATH", "DYLD_FALLBACK_FRAMEWORK_PATH",
66 "DYLD_INSERT_LIBRARIES",
67
68 // defined on Windows
69 "OS", "PROCESSOR_IDENTIFIER", "_ALT_JAVA_HOME_DIR",
70
71 (const char *)0
72 };
73
74 // A simple parser for -XX:OnError, usage:
75 // ptr = OnError;
76 // while ((cmd = next_OnError_command(buffer, sizeof(buffer), &ptr) != NULL)
77 // ... ...
78 static char* next_OnError_command(char* buf, int buflen, const char** ptr) {
79 if (ptr == NULL || *ptr == NULL) return NULL;
80
81 const char* cmd = *ptr;
82
83 // skip leading blanks or ';'
84 while (*cmd == ' ' || *cmd == ';') cmd++;
85
86 if (*cmd == '\0') return NULL;
87
88 const char * cmdend = cmd;
89 while (*cmdend != '\0' && *cmdend != ';') cmdend++;
90
91 Arguments::copy_expand_pid(cmd, cmdend - cmd, buf, buflen);
92
93 *ptr = (*cmdend == '\0' ? cmdend : cmdend + 1);
94 return buf;
95 }
96
97 static void print_bug_submit_message(outputStream *out, Thread *thread) {
98 if (out == NULL) return;
99 out->print_raw_cr("# If you would like to submit a bug report, please visit:");
100 out->print_raw ("# ");
101 out->print_raw_cr(Arguments::java_vendor_url_bug());
102 // If the crash is in native code, encourage user to submit a bug to the
103 // provider of that code.
104 if (thread && thread->is_Java_thread() &&
105 !thread->is_hidden_from_external_view()) {
106 JavaThread* jt = (JavaThread*)thread;
107 if (jt->thread_state() == _thread_in_native) {
108 out->print_cr("# The crash happened outside the Java Virtual Machine in native code.\n# See problematic frame for where to report the bug.");
109 }
110 }
111 out->print_raw_cr("#");
112 }
113
114 bool VMError::coredump_status;
115 char VMError::coredump_message[O_BUFLEN];
116
117 void VMError::record_coredump_status(const char* message, bool status) {
118 coredump_status = status;
119 strncpy(coredump_message, message, sizeof(coredump_message));
120 coredump_message[sizeof(coredump_message)-1] = 0;
121 }
122
123 // Return a string to describe the error
124 char* VMError::error_string(char* buf, int buflen) {
125 char signame_buf[64];
126 const char *signame = os::exception_name(_id, signame_buf, sizeof(signame_buf));
127
128 if (signame) {
129 jio_snprintf(buf, buflen,
130 "%s (0x%x) at pc=" PTR_FORMAT ", pid=%d, tid=" UINTX_FORMAT,
131 signame, _id, _pc,
132 os::current_process_id(), os::current_thread_id());
133 } else if (_filename != NULL && _lineno > 0) {
134 // skip directory names
135 char separator = os::file_separator()[0];
136 const char *p = strrchr(_filename, separator);
137 int n = jio_snprintf(buf, buflen,
138 "Internal Error at %s:%d, pid=%d, tid=" UINTX_FORMAT,
139 p ? p + 1 : _filename, _lineno,
140 os::current_process_id(), os::current_thread_id());
141 if (n >= 0 && n < buflen && _message) {
142 if (strlen(_detail_msg) > 0) {
143 jio_snprintf(buf + n, buflen - n, "%s%s: %s",
144 os::line_separator(), _message, _detail_msg);
145 } else {
146 jio_snprintf(buf + n, buflen - n, "%sError: %s",
147 os::line_separator(), _message);
148 }
149 }
150 } else {
151 jio_snprintf(buf, buflen,
152 "Internal Error (0x%x), pid=%d, tid=" UINTX_FORMAT,
153 _id, os::current_process_id(), os::current_thread_id());
154 }
155
156 return buf;
157 }
158
159 void VMError::print_stack_trace(outputStream* st, JavaThread* jt,
160 char* buf, int buflen, bool verbose) {
161 #ifdef ZERO
162 if (jt->zero_stack()->sp() && jt->top_zero_frame()) {
163 // StackFrameStream uses the frame anchor, which may not have
164 // been set up. This can be done at any time in Zero, however,
165 // so if it hasn't been set up then we just set it up now and
166 // clear it again when we're done.
167 bool has_last_Java_frame = jt->has_last_Java_frame();
168 if (!has_last_Java_frame)
169 jt->set_last_Java_frame();
170 st->print("Java frames:");
171
172 // If the top frame is a Shark frame and the frame anchor isn't
173 // set up then it's possible that the information in the frame
174 // is garbage: it could be from a previous decache, or it could
175 // simply have never been written. So we print a warning...
176 StackFrameStream sfs(jt);
177 if (!has_last_Java_frame && !sfs.is_done()) {
178 if (sfs.current()->zeroframe()->is_shark_frame()) {
179 st->print(" (TOP FRAME MAY BE JUNK)");
180 }
181 }
182 st->cr();
183
184 // Print the frames
185 for(int i = 0; !sfs.is_done(); sfs.next(), i++) {
186 sfs.current()->zero_print_on_error(i, st, buf, buflen);
187 st->cr();
188 }
189
190 // Reset the frame anchor if necessary
191 if (!has_last_Java_frame)
192 jt->reset_last_Java_frame();
193 }
194 #else
195 if (jt->has_last_Java_frame()) {
196 st->print_cr("Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)");
197 for(StackFrameStream sfs(jt); !sfs.is_done(); sfs.next()) {
198 sfs.current()->print_on_error(st, buf, buflen, verbose);
199 st->cr();
200 }
201 }
202 #endif // ZERO
203 }
204
205 static void print_oom_reasons(outputStream* st) {
206 st->print_cr("# Possible reasons:");
207 st->print_cr("# The system is out of physical RAM or swap space");
208 if (UseCompressedOops) {
209 st->print_cr("# The process is running with CompressedOops enabled, and the Java Heap may be blocking the growth of the native heap");
210 }
211 if (LogBytesPerWord == 2) {
212 st->print_cr("# In 32 bit mode, the process size limit was hit");
213 }
214 st->print_cr("# Possible solutions:");
215 st->print_cr("# Reduce memory load on the system");
216 st->print_cr("# Increase physical memory or swap space");
217 st->print_cr("# Check if swap backing store is full");
218 if (LogBytesPerWord == 2) {
219 st->print_cr("# Use 64 bit Java on a 64 bit OS");
220 }
221 st->print_cr("# Decrease Java heap size (-Xmx/-Xms)");
222 st->print_cr("# Decrease number of Java threads");
223 st->print_cr("# Decrease Java thread stack sizes (-Xss)");
224 st->print_cr("# Set larger code cache with -XX:ReservedCodeCacheSize=");
225 if (UseCompressedOops) {
226 switch (Universe::narrow_oop_mode()) {
227 case Universe::UnscaledNarrowOop:
228 st->print_cr("# JVM is running with Unscaled Compressed Oops mode in which the Java heap is");
229 st->print_cr("# placed in the first 4GB address space. The Java Heap base address is the");
230 st->print_cr("# maximum limit for the native heap growth. Please use -XX:HeapBaseMinAddress");
231 st->print_cr("# to set the Java Heap base and to place the Java Heap above 4GB virtual address.");
232 break;
233 case Universe::ZeroBasedNarrowOop:
234 st->print_cr("# JVM is running with Zero Based Compressed Oops mode in which the Java heap is");
235 st->print_cr("# placed in the first 32GB address space. The Java Heap base address is the");
236 st->print_cr("# maximum limit for the native heap growth. Please use -XX:HeapBaseMinAddress");
237 st->print_cr("# to set the Java Heap base and to place the Java Heap above 32GB virtual address.");
238 break;
239 }
240 }
241 st->print_cr("# This output file may be truncated or incomplete.");
242 }
243
244 static const char* gc_mode() {
245 if (UseG1GC) return "g1 gc";
246 if (UseParallelGC) return "parallel gc";
247 if (UseConcMarkSweepGC) return "concurrent mark sweep gc";
248 if (UseSerialGC) return "serial gc";
249 return "ERROR in GC mode";
250 }
251
252 static void report_vm_version(outputStream* st, char* buf, int buflen) {
253 // VM version
254 st->print_cr("#");
255 JDK_Version::current().to_string(buf, buflen);
256 const char* runtime_name = JDK_Version::runtime_name() != NULL ?
257 JDK_Version::runtime_name() : "";
258 const char* runtime_version = JDK_Version::runtime_version() != NULL ?
259 JDK_Version::runtime_version() : "";
260 const char* jdk_debug_level = Abstract_VM_Version::printable_jdk_debug_level() != NULL ?
261 Abstract_VM_Version::printable_jdk_debug_level() : "";
262
263 st->print_cr("# JRE version: %s (%s) (%sbuild %s)", runtime_name, buf,
264 jdk_debug_level, runtime_version);
265
266 // This is the long version with some default settings added
267 st->print_cr("# Java VM: %s (%s%s, %s%s%s%s%s, %s, %s)",
268 Abstract_VM_Version::vm_name(),
269 jdk_debug_level,
270 Abstract_VM_Version::vm_release(),
271 Abstract_VM_Version::vm_info_string(),
272 TieredCompilation ? ", tiered" : "",
273 #if INCLUDE_JVMCI
274 EnableJVMCI ? ", jvmci" : "",
275 UseJVMCICompiler ? ", jvmci compiler" : "",
276 #else
277 "", "",
278 #endif
279 UseCompressedOops ? ", compressed oops" : "",
280 gc_mode(),
281 Abstract_VM_Version::vm_platform_string()
282 );
283 }
284
285 // This is the main function to report a fatal error. Only one thread can
286 // call this function, so we don't need to worry about MT-safety. But it's
287 // possible that the error handler itself may crash or die on an internal
288 // error, for example, when the stack/heap is badly damaged. We must be
289 // able to handle recursive errors that happen inside error handler.
290 //
291 // Error reporting is done in several steps. If a crash or internal error
292 // occurred when reporting an error, the nested signal/exception handler
293 // can skip steps that are already (or partially) done. Error reporting will
294 // continue from the next step. This allows us to retrieve and print
295 // information that may be unsafe to get after a fatal error. If it happens,
296 // you may find nested report_and_die() frames when you look at the stack
297 // in a debugger.
298 //
299 // In general, a hang in error handler is much worse than a crash or internal
300 // error, as it's harder to recover from a hang. Deadlock can happen if we
301 // try to grab a lock that is already owned by current thread, or if the
302 // owner is blocked forever (e.g. in os::infinite_sleep()). If possible, the
303 // error handler and all the functions it called should avoid grabbing any
304 // lock. An important thing to notice is that memory allocation needs a lock.
305 //
306 // We should avoid using large stack allocated buffers. Many errors happen
307 // when stack space is already low. Making things even worse is that there
308 // could be nested report_and_die() calls on stack (see above). Only one
309 // thread can report error, so large buffers are statically allocated in data
310 // segment.
311
312 int VMError::_current_step;
313 const char* VMError::_current_step_info;
314
315 void VMError::report(outputStream* st, bool _verbose) {
316
317 # define BEGIN if (_current_step == 0) { _current_step = __LINE__;
318 # define STEP(s) } if (_current_step < __LINE__) { _current_step = __LINE__; _current_step_info = s;
319 # define END }
320
321 // don't allocate large buffer on stack
322 static char buf[O_BUFLEN];
323
324 BEGIN
325
326 STEP("printing fatal error message")
327
328 st->print_cr("#");
329 if (should_report_bug(_id)) {
330 st->print_cr("# A fatal error has been detected by the Java Runtime Environment:");
331 } else {
332 st->print_cr("# There is insufficient memory for the Java "
333 "Runtime Environment to continue.");
334 }
335
336 #ifndef PRODUCT
337 // Error handler self tests
338
339 // test secondary error handling. Test it twice, to test that resetting
340 // error handler after a secondary crash works.
341 STEP("test secondary crash 1")
342 if (_verbose && TestCrashInErrorHandler != 0) {
343 st->print_cr("Will crash now (TestCrashInErrorHandler=" UINTX_FORMAT ")...",
344 TestCrashInErrorHandler);
345 controlled_crash(TestCrashInErrorHandler);
346 }
347
348 STEP("test secondary crash 2")
349 if (_verbose && TestCrashInErrorHandler != 0) {
350 st->print_cr("Will crash now (TestCrashInErrorHandler=" UINTX_FORMAT ")...",
351 TestCrashInErrorHandler);
352 controlled_crash(TestCrashInErrorHandler);
353 }
354
355 STEP("test safefetch in error handler")
356 // test whether it is safe to use SafeFetch32 in Crash Handler. Test twice
357 // to test that resetting the signal handler works correctly.
358 if (_verbose && TestSafeFetchInErrorHandler) {
359 st->print_cr("Will test SafeFetch...");
360 if (CanUseSafeFetch32()) {
361 int* const invalid_pointer = (int*) get_segfault_address();
362 const int x = 0x76543210;
363 int i1 = SafeFetch32(invalid_pointer, x);
364 int i2 = SafeFetch32(invalid_pointer, x);
365 if (i1 == x && i2 == x) {
366 st->print_cr("SafeFetch OK."); // Correctly deflected and returned default pattern
367 } else {
368 st->print_cr("??");
369 }
370 } else {
371 st->print_cr("not possible; skipped.");
372 }
373 }
374 #endif // PRODUCT
375
376 STEP("printing type of error")
377
378 switch(_id) {
379 case OOM_MALLOC_ERROR:
380 case OOM_MMAP_ERROR:
381 if (_size) {
382 st->print("# Native memory allocation ");
383 st->print((_id == (int)OOM_MALLOC_ERROR) ? "(malloc) failed to allocate " :
384 "(mmap) failed to map ");
385 jio_snprintf(buf, sizeof(buf), SIZE_FORMAT, _size);
386 st->print("%s", buf);
387 st->print(" bytes");
388 if (strlen(_detail_msg) > 0) {
389 st->print(" for ");
390 st->print("%s", _detail_msg);
391 }
392 st->cr();
393 } else {
394 if (strlen(_detail_msg) > 0) {
395 st->print("# ");
396 st->print_cr("%s", _detail_msg);
397 }
398 }
399 // In error file give some solutions
400 if (_verbose) {
401 print_oom_reasons(st);
402 } else {
403 return; // that's enough for the screen
404 }
405 break;
406 case INTERNAL_ERROR:
407 default:
408 break;
409 }
410
411 STEP("printing exception/signal name")
412
413 st->print_cr("#");
414 st->print("# ");
415 // Is it an OS exception/signal?
416 if (os::exception_name(_id, buf, sizeof(buf))) {
417 st->print("%s", buf);
418 st->print(" (0x%x)", _id); // signal number
419 st->print(" at pc=" PTR_FORMAT, p2i(_pc));
420 } else {
421 if (should_report_bug(_id)) {
422 st->print("Internal Error");
423 } else {
424 st->print("Out of Memory Error");
425 }
426 if (_filename != NULL && _lineno > 0) {
427 #ifdef PRODUCT
428 // In product mode chop off pathname?
429 char separator = os::file_separator()[0];
430 const char *p = strrchr(_filename, separator);
431 const char *file = p ? p+1 : _filename;
432 #else
433 const char *file = _filename;
434 #endif
435 st->print(" (%s:%d)", file, _lineno);
436 } else {
437 st->print(" (0x%x)", _id);
438 }
439 }
440
441 STEP("printing current thread and pid")
442
443 // process id, thread id
444 st->print(", pid=%d", os::current_process_id());
445 st->print(", tid=" UINTX_FORMAT, os::current_thread_id());
446 st->cr();
447
448 STEP("printing error message")
449
450 if (should_report_bug(_id)) { // already printed the message.
451 // error message
452 if (strlen(_detail_msg) > 0) {
453 st->print_cr("# %s: %s", _message ? _message : "Error", _detail_msg);
454 } else if (_message) {
455 st->print_cr("# Error: %s", _message);
456 }
457 }
458
459 STEP("printing Java version string")
460
461 report_vm_version(st, buf, sizeof(buf));
462
463 STEP("printing problematic frame")
464
465 // Print current frame if we have a context (i.e. it's a crash)
466 if (_context) {
467 st->print_cr("# Problematic frame:");
468 st->print("# ");
469 frame fr = os::fetch_frame_from_context(_context);
470 fr.print_on_error(st, buf, sizeof(buf));
471 st->cr();
472 st->print_cr("#");
473 }
474
475 STEP("printing core file information")
476 st->print("# ");
477 if (CreateCoredumpOnCrash) {
478 if (coredump_status) {
479 st->print("Core dump will be written. Default location: %s", coredump_message);
480 } else {
481 st->print("No core dump will be written. %s", coredump_message);
482 }
483 } else {
484 st->print("CreateCoredumpOnCrash turned off, no core file dumped");
485 }
486 st->cr();
487 st->print_cr("#");
488
489 STEP("printing bug submit message")
490
491 if (should_report_bug(_id) && _verbose) {
492 print_bug_submit_message(st, _thread);
493 }
494
495 STEP("printing summary")
496
497 if (_verbose) {
498 st->cr();
499 st->print_cr("--------------- S U M M A R Y ------------");
500 st->cr();
501 }
502
503 STEP("printing VM option summary")
504
505 if (_verbose) {
506 // VM options
507 Arguments::print_summary_on(st);
508 st->cr();
509 }
510
511 STEP("printing summary machine and OS info")
512
513 if (_verbose) {
514 os::print_summary_info(st, buf, sizeof(buf));
515 }
516
517
518 STEP("printing date and time")
519
520 if (_verbose) {
521 os::print_date_and_time(st, buf, sizeof(buf));
522 }
523
524 STEP("printing thread")
525
526 if (_verbose) {
527 st->cr();
528 st->print_cr("--------------- T H R E A D ---------------");
529 st->cr();
530 }
531
532 STEP("printing current thread")
533
534 // current thread
535 if (_verbose) {
536 if (_thread) {
537 st->print("Current thread (" PTR_FORMAT "): ", p2i(_thread));
538 _thread->print_on_error(st, buf, sizeof(buf));
539 st->cr();
540 } else {
541 st->print_cr("Current thread is native thread");
542 }
543 st->cr();
544 }
545
546 STEP("printing current compile task")
547
548 if (_verbose && _thread && _thread->is_Compiler_thread()) {
549 CompilerThread* t = (CompilerThread*)_thread;
550 if (t->task()) {
551 st->cr();
552 st->print_cr("Current CompileTask:");
553 t->task()->print_line_on_error(st, buf, sizeof(buf));
554 st->cr();
555 }
556 }
557
558
559 STEP("printing stack bounds")
560
561 if (_verbose) {
562 st->print("Stack: ");
563
564 address stack_top;
565 size_t stack_size;
566
567 if (_thread) {
568 stack_top = _thread->stack_base();
569 stack_size = _thread->stack_size();
570 } else {
571 stack_top = os::current_stack_base();
572 stack_size = os::current_stack_size();
573 }
574
575 address stack_bottom = stack_top - stack_size;
576 st->print("[" PTR_FORMAT "," PTR_FORMAT "]", p2i(stack_bottom), p2i(stack_top));
577
578 frame fr = _context ? os::fetch_frame_from_context(_context)
579 : os::current_frame();
580
581 if (fr.sp()) {
582 st->print(", sp=" PTR_FORMAT, p2i(fr.sp()));
583 size_t free_stack_size = pointer_delta(fr.sp(), stack_bottom, 1024);
584 st->print(", free space=" SIZE_FORMAT "k", free_stack_size);
585 }
586
587 st->cr();
588 }
589
590 STEP("printing native stack")
591
592 if (_verbose) {
593 if (os::platform_print_native_stack(st, _context, buf, sizeof(buf))) {
594 // We have printed the native stack in platform-specific code
595 // Windows/x64 needs special handling.
596 } else {
597 frame fr = _context ? os::fetch_frame_from_context(_context)
598 : os::current_frame();
599
600 print_native_stack(st, fr, _thread, buf, sizeof(buf));
601 }
602 }
603
604 STEP("printing Java stack")
605
606 if (_verbose && _thread && _thread->is_Java_thread()) {
607 print_stack_trace(st, (JavaThread*)_thread, buf, sizeof(buf));
608 }
609
610 STEP("printing target Java thread stack")
611
612 // printing Java thread stack trace if it is involved in GC crash
613 if (_verbose && _thread && (_thread->is_Named_thread())) {
614 JavaThread* jt = ((NamedThread *)_thread)->processed_thread();
615 if (jt != NULL) {
616 st->print_cr("JavaThread " PTR_FORMAT " (nid = %d) was being processed", p2i(jt), jt->osthread()->thread_id());
617 print_stack_trace(st, jt, buf, sizeof(buf), true);
618 }
619 }
620
621 STEP("printing siginfo")
622
623 // signal no, signal code, address that caused the fault
624 if (_verbose && _siginfo) {
625 st->cr();
626 os::print_siginfo(st, _siginfo);
627 st->cr();
628 }
629
630 STEP("CDS archive access warning")
631
632 // Print an explicit hint if we crashed on access to the CDS archive.
633 if (_verbose && _siginfo) {
634 check_failing_cds_access(st, _siginfo);
635 st->cr();
636 }
637
638 STEP("printing register info")
639
640 // decode register contents if possible
641 if (_verbose && _context && Universe::is_fully_initialized()) {
642 os::print_register_info(st, _context);
643 st->cr();
644 }
645
646 STEP("printing registers, top of stack, instructions near pc")
647
648 // registers, top of stack, instructions near pc
649 if (_verbose && _context) {
650 os::print_context(st, _context);
651 st->cr();
652 }
653
654 STEP("printing code blob if possible")
655
656 if (_verbose && _context) {
657 CodeBlob* cb = CodeCache::find_blob(_pc);
658 if (cb != NULL) {
659 if (Interpreter::contains(_pc)) {
660 // The interpreter CodeBlob is very large so try to print the codelet instead.
661 InterpreterCodelet* codelet = Interpreter::codelet_containing(_pc);
662 if (codelet != NULL) {
663 codelet->print_on(st);
664 Disassembler::decode(codelet->code_begin(), codelet->code_end(), st);
665 }
666 } else {
667 StubCodeDesc* desc = StubCodeDesc::desc_for(_pc);
668 if (desc != NULL) {
669 desc->print_on(st);
670 Disassembler::decode(desc->begin(), desc->end(), st);
671 } else {
672 Disassembler::decode(cb, st);
673 st->cr();
674 }
675 }
676 }
677 }
678
679 STEP("printing VM operation")
680
681 if (_verbose && _thread && _thread->is_VM_thread()) {
682 VMThread* t = (VMThread*)_thread;
683 VM_Operation* op = t->vm_operation();
684 if (op) {
685 op->print_on_error(st);
686 st->cr();
687 st->cr();
688 }
689 }
690
691 STEP("printing process")
692
693 if (_verbose) {
694 st->cr();
695 st->print_cr("--------------- P R O C E S S ---------------");
696 st->cr();
697 }
698
699 STEP("printing all threads")
700
701 // all threads
702 if (_verbose && _thread) {
703 Threads::print_on_error(st, _thread, buf, sizeof(buf));
704 st->cr();
705 }
706
707 STEP("printing VM state")
708
709 if (_verbose) {
710 // Safepoint state
711 st->print("VM state:");
712
713 if (SafepointSynchronize::is_synchronizing()) st->print("synchronizing");
714 else if (SafepointSynchronize::is_at_safepoint()) st->print("at safepoint");
715 else st->print("not at safepoint");
716
717 // Also see if error occurred during initialization or shutdown
718 if (!Universe::is_fully_initialized()) {
719 st->print(" (not fully initialized)");
720 } else if (VM_Exit::vm_exited()) {
721 st->print(" (shutting down)");
722 } else {
723 st->print(" (normal execution)");
724 }
725 st->cr();
726 st->cr();
727 }
728
729 STEP("printing owned locks on error")
730
731 // mutexes/monitors that currently have an owner
732 if (_verbose) {
733 print_owned_locks_on_error(st);
734 st->cr();
735 }
736
737 STEP("printing number of OutOfMemoryError and StackOverflow exceptions")
738
739 if (_verbose && Exceptions::has_exception_counts()) {
740 st->print_cr("OutOfMemory and StackOverflow Exception counts:");
741 Exceptions::print_exception_counts_on_error(st);
742 st->cr();
743 }
744
745 STEP("printing compressed oops mode")
746
747 if (_verbose && UseCompressedOops) {
748 Universe::print_compressed_oops_mode(st);
749 if (UseCompressedClassPointers) {
750 Metaspace::print_compressed_class_space(st);
751 }
752 st->cr();
753 }
754
755 STEP("printing heap information")
756
757 if (_verbose && Universe::is_fully_initialized()) {
758 Universe::heap()->print_on_error(st);
759 st->cr();
760 st->print_cr("Polling page: " INTPTR_FORMAT, p2i(os::get_polling_page()));
761 st->cr();
762 }
763
764 STEP("printing code cache information")
765
766 if (_verbose && Universe::is_fully_initialized()) {
767 // print code cache information before vm abort
768 CodeCache::print_summary(st);
769 st->cr();
770 }
771
772 STEP("printing ring buffers")
773
774 if (_verbose) {
775 Events::print_all(st);
776 st->cr();
777 }
778
779 STEP("printing dynamic libraries")
780
781 if (_verbose) {
782 // dynamic libraries, or memory map
783 os::print_dll_info(st);
784 st->cr();
785 }
786
787 STEP("printing VM options")
788
789 if (_verbose) {
790 // VM options
791 Arguments::print_on(st);
792 st->cr();
793 }
794
795 STEP("printing warning if internal testing API used")
796
797 if (WhiteBox::used()) {
798 st->print_cr("Unsupported internal testing APIs have been used.");
799 st->cr();
800 }
801
802 STEP("printing log configuration")
803 if (_verbose){
804 st->print_cr("Logging:");
805 LogConfiguration::describe_current_configuration(st);
806 st->cr();
807 }
808
809 STEP("printing all environment variables")
810
811 if (_verbose) {
812 os::print_environment_variables(st, env_list);
813 st->cr();
814 }
815
816 STEP("printing signal handlers")
817
818 if (_verbose) {
819 os::print_signal_handlers(st, buf, sizeof(buf));
820 st->cr();
821 }
822
823 STEP("Native Memory Tracking")
824 if (_verbose) {
825 MemTracker::error_report(st);
826 }
827
828 STEP("printing system")
829
830 if (_verbose) {
831 st->cr();
832 st->print_cr("--------------- S Y S T E M ---------------");
833 st->cr();
834 }
835
836 STEP("printing OS information")
837
838 if (_verbose) {
839 os::print_os_info(st);
840 st->cr();
841 }
842
843 STEP("printing CPU info")
844 if (_verbose) {
845 os::print_cpu_info(st, buf, sizeof(buf));
846 st->cr();
847 }
848
849 STEP("printing memory info")
850
851 if (_verbose) {
852 os::print_memory_info(st);
853 st->cr();
854 }
855
856 STEP("printing internal vm info")
857
858 if (_verbose) {
859 st->print_cr("vm_info: %s", Abstract_VM_Version::internal_vm_info_string());
860 st->cr();
861 }
862
863 // print a defined marker to show that error handling finished correctly.
864 STEP("printing end marker")
865
866 if (_verbose) {
867 st->print_cr("END.");
868 }
869
870 END
871
872 # undef BEGIN
873 # undef STEP
874 # undef END
875 }
876
877 // Report for the vm_info_cmd. This prints out the information above omitting
878 // crash and thread specific information. If output is added above, it should be added
879 // here also, if it is safe to call during a running process.
880 void VMError::print_vm_info(outputStream* st) {
881
882 char buf[O_BUFLEN];
883 report_vm_version(st, buf, sizeof(buf));
884
885 // STEP("printing summary")
886
887 st->cr();
888 st->print_cr("--------------- S U M M A R Y ------------");
889 st->cr();
890
891 // STEP("printing VM option summary")
892
893 // VM options
894 Arguments::print_summary_on(st);
895 st->cr();
896
897 // STEP("printing summary machine and OS info")
898
899 os::print_summary_info(st, buf, sizeof(buf));
900
901 // STEP("printing date and time")
902
903 os::print_date_and_time(st, buf, sizeof(buf));
904
905 // Skip: STEP("printing thread")
906
907 // STEP("printing process")
908
909 st->cr();
910 st->print_cr("--------------- P R O C E S S ---------------");
911 st->cr();
912
913 // STEP("printing number of OutOfMemoryError and StackOverflow exceptions")
914
915 if (Exceptions::has_exception_counts()) {
916 st->print_cr("OutOfMemory and StackOverflow Exception counts:");
917 Exceptions::print_exception_counts_on_error(st);
918 st->cr();
919 }
920
921 // STEP("printing compressed oops mode")
922
923 if (UseCompressedOops) {
924 Universe::print_compressed_oops_mode(st);
925 if (UseCompressedClassPointers) {
926 Metaspace::print_compressed_class_space(st);
927 }
928 st->cr();
929 }
930
931 // STEP("printing heap information")
932
933 if (Universe::is_fully_initialized()) {
934 MutexLocker hl(Heap_lock);
935 Universe::heap()->print_on_error(st);
936 st->cr();
937 st->print_cr("Polling page: " INTPTR_FORMAT, p2i(os::get_polling_page()));
938 st->cr();
939 }
940
941 // STEP("printing code cache information")
942
943 if (Universe::is_fully_initialized()) {
944 // print code cache information before vm abort
945 CodeCache::print_summary(st);
946 st->cr();
947 }
948
949 // STEP("printing ring buffers")
950
951 Events::print_all(st);
952 st->cr();
953
954 // STEP("printing dynamic libraries")
955
956 // dynamic libraries, or memory map
957 os::print_dll_info(st);
958 st->cr();
959
960 // STEP("printing VM options")
961
962 // VM options
963 Arguments::print_on(st);
964 st->cr();
965
966 // STEP("printing warning if internal testing API used")
967
968 if (WhiteBox::used()) {
969 st->print_cr("Unsupported internal testing APIs have been used.");
970 st->cr();
971 }
972
973 // STEP("printing log configuration")
974 st->print_cr("Logging:");
975 LogConfiguration::describe(st);
976 st->cr();
977
978 // STEP("printing all environment variables")
979
980 os::print_environment_variables(st, env_list);
981 st->cr();
982
983 // STEP("printing signal handlers")
984
985 os::print_signal_handlers(st, buf, sizeof(buf));
986 st->cr();
987
988 // STEP("Native Memory Tracking")
989
990 MemTracker::error_report(st);
991
992 // STEP("printing system")
993
994 st->cr();
995 st->print_cr("--------------- S Y S T E M ---------------");
996 st->cr();
997
998 // STEP("printing OS information")
999
1000 os::print_os_info(st);
1001 st->cr();
1002
1003 // STEP("printing CPU info")
1004
1005 os::print_cpu_info(st, buf, sizeof(buf));
1006 st->cr();
1007
1008 // STEP("printing memory info")
1009
1010 os::print_memory_info(st);
1011 st->cr();
1012
1013 // STEP("printing internal vm info")
1014
1015 st->print_cr("vm_info: %s", Abstract_VM_Version::internal_vm_info_string());
1016 st->cr();
1017
1018 // print a defined marker to show that error handling finished correctly.
1019 // STEP("printing end marker")
1020
1021 st->print_cr("END.");
1022 }
1023
1024 volatile intptr_t VMError::first_error_tid = -1;
1025
1026 // An error could happen before tty is initialized or after it has been
1027 // destroyed.
1028 // Please note: to prevent large stack allocations, the log- and
1029 // output-stream use a global scratch buffer for format printing.
1030 // (see VmError::report_and_die(). Access to those streams is synchronized
1031 // in VmError::report_and_die() - there is only one reporting thread at
1032 // any given time.
1033 fdStream VMError::out(defaultStream::output_fd());
1034 fdStream VMError::log; // error log used by VMError::report_and_die()
1035
1036 /** Expand a pattern into a buffer starting at pos and open a file using constructed path */
1037 static int expand_and_open(const char* pattern, char* buf, size_t buflen, size_t pos) {
1038 int fd = -1;
1039 if (Arguments::copy_expand_pid(pattern, strlen(pattern), &buf[pos], buflen - pos)) {
1040 // the O_EXCL flag will cause the open to fail if the file exists
1041 fd = open(buf, O_RDWR | O_CREAT | O_EXCL, 0666);
1042 }
1043 return fd;
1044 }
1045
1046 /**
1047 * Construct file name for a log file and return it's file descriptor.
1048 * Name and location depends on pattern, default_pattern params and access
1049 * permissions.
1050 */
1051 static int prepare_log_file(const char* pattern, const char* default_pattern, char* buf, size_t buflen) {
1052 int fd = -1;
1053
1054 // If possible, use specified pattern to construct log file name
1055 if (pattern != NULL) {
1056 fd = expand_and_open(pattern, buf, buflen, 0);
1057 }
1058
1059 // Either user didn't specify, or the user's location failed,
1060 // so use the default name in the current directory
1061 if (fd == -1) {
1062 const char* cwd = os::get_current_directory(buf, buflen);
1063 if (cwd != NULL) {
1064 size_t pos = strlen(cwd);
1065 int fsep_len = jio_snprintf(&buf[pos], buflen-pos, "%s", os::file_separator());
1066 pos += fsep_len;
1067 if (fsep_len > 0) {
1068 fd = expand_and_open(default_pattern, buf, buflen, pos);
1069 }
1070 }
1071 }
1072
1073 // try temp directory if it exists.
1074 if (fd == -1) {
1075 const char* tmpdir = os::get_temp_directory();
1076 if (tmpdir != NULL && strlen(tmpdir) > 0) {
1077 int pos = jio_snprintf(buf, buflen, "%s%s", tmpdir, os::file_separator());
1078 if (pos > 0) {
1079 fd = expand_and_open(default_pattern, buf, buflen, pos);
1080 }
1081 }
1082 }
1083
1084 return fd;
1085 }
1086
1087 int VMError::_id;
1088 const char* VMError::_message;
1089 char VMError::_detail_msg[1024];
1090 Thread* VMError::_thread;
1091 address VMError::_pc;
1092 void* VMError::_siginfo;
1093 void* VMError::_context;
1094 const char* VMError::_filename;
1095 int VMError::_lineno;
1096 size_t VMError::_size;
1097
1098 void VMError::report_and_die(Thread* thread, unsigned int sig, address pc, void* siginfo,
1099 void* context, const char* detail_fmt, ...)
1100 {
1101 va_list detail_args;
1102 va_start(detail_args, detail_fmt);
1103 report_and_die(sig, NULL, detail_fmt, detail_args, thread, pc, siginfo, context, NULL, 0, 0);
1104 va_end(detail_args);
1105 }
1106
1107 void VMError::report_and_die(Thread* thread, unsigned int sig, address pc, void* siginfo, void* context)
1108 {
1109 report_and_die(thread, sig, pc, siginfo, context, "%s", "");
1110 }
1111
1112 void VMError::report_and_die(const char* message, const char* detail_fmt, ...)
1113 {
1114 va_list detail_args;
1115 va_start(detail_args, detail_fmt);
1116 report_and_die(INTERNAL_ERROR, message, detail_fmt, detail_args, NULL, NULL, NULL, NULL, NULL, 0, 0);
1117 va_end(detail_args);
1118 }
1119
1120 void VMError::report_and_die(const char* message)
1121 {
1122 report_and_die(message, "%s", "");
1123 }
1124
1125 void VMError::report_and_die(Thread* thread, const char* filename, int lineno, const char* message,
1126 const char* detail_fmt, va_list detail_args)
1127 {
1128 report_and_die(INTERNAL_ERROR, message, detail_fmt, detail_args, thread, NULL, NULL, NULL, filename, lineno, 0);
1129 }
1130
1131 void VMError::report_and_die(Thread* thread, const char* filename, int lineno, size_t size,
1132 VMErrorType vm_err_type, const char* detail_fmt, va_list detail_args) {
1133 report_and_die(vm_err_type, NULL, detail_fmt, detail_args, thread, NULL, NULL, NULL, filename, lineno, size);
1134 }
1135
1136 void VMError::report_and_die(int id, const char* message, const char* detail_fmt, va_list detail_args,
1137 Thread* thread, address pc, void* siginfo, void* context, const char* filename,
1138 int lineno, size_t size)
1139 {
1140 // Don't allocate large buffer on stack
1141 static char buffer[O_BUFLEN];
1142 out.set_scratch_buffer(buffer, sizeof(buffer));
1143 log.set_scratch_buffer(buffer, sizeof(buffer));
1144
1145 // How many errors occurred in error handler when reporting first_error.
1146 static int recursive_error_count;
1147
1148 // We will first print a brief message to standard out (verbose = false),
1149 // then save detailed information in log file (verbose = true).
1150 static bool out_done = false; // done printing to standard out
1151 static bool log_done = false; // done saving error log
1152 static bool transmit_report_done = false; // done error reporting
1153
1154 if (SuppressFatalErrorMessage) {
1155 os::abort(CreateCoredumpOnCrash);
1156 }
1157 intptr_t mytid = os::current_thread_id();
1158 if (first_error_tid == -1 &&
1159 Atomic::cmpxchg_ptr(mytid, &first_error_tid, -1) == -1) {
1160
1161 // Initialize time stamps to use the same base.
1162 out.time_stamp().update_to(1);
1163 log.time_stamp().update_to(1);
1164
1165 _id = id;
1166 _message = message;
1167 _thread = thread;
1168 _pc = pc;
1169 _siginfo = siginfo;
1170 _context = context;
1171 _filename = filename;
1172 _lineno = lineno;
1173 _size = size;
1174 jio_vsnprintf(_detail_msg, sizeof(_detail_msg), detail_fmt, detail_args);
1175
1176 // first time
1177 set_error_reported();
1178
1179 if (ShowMessageBoxOnError || PauseAtExit) {
1180 show_message_box(buffer, sizeof(buffer));
1181
1182 // User has asked JVM to abort. Reset ShowMessageBoxOnError so the
1183 // WatcherThread can kill JVM if the error handler hangs.
1184 ShowMessageBoxOnError = false;
1185 }
1186
1187 os::check_dump_limit(buffer, sizeof(buffer));
1188
1189 // reset signal handlers or exception filter; make sure recursive crashes
1190 // are handled properly.
1191 reset_signal_handlers();
1192
1193 TRACE_VM_ERROR();
1194
1195 } else {
1196 // If UseOsErrorReporting we call this for each level of the call stack
1197 // while searching for the exception handler. Only the first level needs
1198 // to be reported.
1199 if (UseOSErrorReporting && log_done) return;
1200
1201 // This is not the first error, see if it happened in a different thread
1202 // or in the same thread during error reporting.
1203 if (first_error_tid != mytid) {
1204 char msgbuf[64];
1205 jio_snprintf(msgbuf, sizeof(msgbuf),
1206 "[thread " INTX_FORMAT " also had an error]",
1207 mytid);
1208 out.print_raw_cr(msgbuf);
1209
1210 // error reporting is not MT-safe, block current thread
1211 os::infinite_sleep();
1212
1213 } else {
1214 if (recursive_error_count++ > 30) {
1215 out.print_raw_cr("[Too many errors, abort]");
1216 os::die();
1217 }
1218
1219 jio_snprintf(buffer, sizeof(buffer),
1220 "[error occurred during error reporting (%s), id 0x%x]",
1221 _current_step_info, _id);
1222 if (log.is_open()) {
1223 log.cr();
1224 log.print_raw_cr(buffer);
1225 log.cr();
1226 } else {
1227 out.cr();
1228 out.print_raw_cr(buffer);
1229 out.cr();
1230 }
1231 }
1232 }
1233
1234 // print to screen
1235 if (!out_done) {
1236 report(&out, false);
1237
1238 out_done = true;
1239
1240 _current_step = 0;
1241 _current_step_info = "";
1242 }
1243
1244 // print to error log file
1245 if (!log_done) {
1246 // see if log file is already open
1247 if (!log.is_open()) {
1248 // open log file
1249 int fd = prepare_log_file(ErrorFile, "hs_err_pid%p.log", buffer, sizeof(buffer));
1250 if (fd != -1) {
1251 out.print_raw("# An error report file with more information is saved as:\n# ");
1252 out.print_raw_cr(buffer);
1253
1254 log.set_fd(fd);
1255 } else {
1256 out.print_raw_cr("# Can not save log file, dump to screen..");
1257 log.set_fd(defaultStream::output_fd());
1258 /* Error reporting currently needs dumpfile.
1259 * Maybe implement direct streaming in the future.*/
1260 transmit_report_done = true;
1261 }
1262 }
1263
1264 report(&log, true);
1265 _current_step = 0;
1266 _current_step_info = "";
1267
1268 // Run error reporting to determine whether or not to report the crash.
1269 if (!transmit_report_done && should_report_bug(_id)) {
1270 transmit_report_done = true;
1271 const int fd2 = ::dup(log.fd());
1272 FILE* const hs_err = ::fdopen(fd2, "r");
1273 if (NULL != hs_err) {
1274 ErrorReporter er;
1275 er.call(hs_err, buffer, O_BUFLEN);
1276 }
1277 ::fclose(hs_err);
1278 }
1279
1280 if (log.fd() != defaultStream::output_fd()) {
1281 close(log.fd());
1282 }
1283
1284 log.set_fd(-1);
1285 log_done = true;
1286 }
1287
1288 static bool skip_replay = ReplayCompiles; // Do not overwrite file during replay
1289 if (DumpReplayDataOnError && _thread && _thread->is_Compiler_thread() && !skip_replay) {
1290 skip_replay = true;
1291 ciEnv* env = ciEnv::current();
1292 if (env != NULL) {
1293 int fd = prepare_log_file(ReplayDataFile, "replay_pid%p.log", buffer, sizeof(buffer));
1294 if (fd != -1) {
1295 FILE* replay_data_file = os::open(fd, "w");
1296 if (replay_data_file != NULL) {
1297 fileStream replay_data_stream(replay_data_file, /*need_close=*/true);
1298 env->dump_replay_data_unsafe(&replay_data_stream);
1299 out.print_raw("#\n# Compiler replay data is saved as:\n# ");
1300 out.print_raw_cr(buffer);
1301 } else {
1302 int e = errno;
1303 out.print_raw("#\n# Can't open file to dump replay data. Error: ");
1304 out.print_raw_cr(os::strerror(e));
1305 }
1306 }
1307 }
1308 }
1309
1310 static bool skip_bug_url = !should_report_bug(_id);
1311 if (!skip_bug_url) {
1312 skip_bug_url = true;
1313
1314 out.print_raw_cr("#");
1315 print_bug_submit_message(&out, _thread);
1316 }
1317
1318 static bool skip_OnError = false;
1319 if (!skip_OnError && OnError && OnError[0]) {
1320 skip_OnError = true;
1321
1322 // Flush output and finish logs before running OnError commands.
1323 ostream_abort();
1324
1325 out.print_raw_cr("#");
1326 out.print_raw ("# -XX:OnError=\"");
1327 out.print_raw (OnError);
1328 out.print_raw_cr("\"");
1329
1330 char* cmd;
1331 const char* ptr = OnError;
1332 while ((cmd = next_OnError_command(buffer, sizeof(buffer), &ptr)) != NULL){
1333 out.print_raw ("# Executing ");
1334 #if defined(LINUX) || defined(_ALLBSD_SOURCE)
1335 out.print_raw ("/bin/sh -c ");
1336 #elif defined(SOLARIS)
1337 out.print_raw ("/usr/bin/sh -c ");
1338 #endif
1339 out.print_raw ("\"");
1340 out.print_raw (cmd);
1341 out.print_raw_cr("\" ...");
1342
1343 if (os::fork_and_exec(cmd) < 0) {
1344 out.print_cr("os::fork_and_exec failed: %s (%s=%d)",
1345 os::strerror(errno), os::errno_name(errno), errno);
1346 }
1347 }
1348
1349 // done with OnError
1350 OnError = NULL;
1351 }
1352
1353 if (!UseOSErrorReporting) {
1354 // os::abort() will call abort hooks, try it first.
1355 static bool skip_os_abort = false;
1356 if (!skip_os_abort) {
1357 skip_os_abort = true;
1358 bool dump_core = should_report_bug(_id);
1359 os::abort(dump_core && CreateCoredumpOnCrash, _siginfo, _context);
1360 }
1361
1362 // if os::abort() doesn't abort, try os::die();
1363 os::die();
1364 }
1365 }
1366
1367 /*
1368 * OnOutOfMemoryError scripts/commands executed while VM is a safepoint - this
1369 * ensures utilities such as jmap can observe the process is a consistent state.
1370 */
1371 class VM_ReportJavaOutOfMemory : public VM_Operation {
1372 private:
1373 const char* _message;
1374 public:
1375 VM_ReportJavaOutOfMemory(const char* message) { _message = message; }
1376 VMOp_Type type() const { return VMOp_ReportJavaOutOfMemory; }
1377 void doit();
1378 };
1379
1380 void VM_ReportJavaOutOfMemory::doit() {
1381 // Don't allocate large buffer on stack
1382 static char buffer[O_BUFLEN];
1383
1384 tty->print_cr("#");
1385 tty->print_cr("# java.lang.OutOfMemoryError: %s", _message);
1386 tty->print_cr("# -XX:OnOutOfMemoryError=\"%s\"", OnOutOfMemoryError);
1387
1388 // make heap parsability
1389 Universe::heap()->ensure_parsability(false); // no need to retire TLABs
1390
1391 char* cmd;
1392 const char* ptr = OnOutOfMemoryError;
1393 while ((cmd = next_OnError_command(buffer, sizeof(buffer), &ptr)) != NULL){
1394 tty->print("# Executing ");
1395 #if defined(LINUX)
1396 tty->print ("/bin/sh -c ");
1397 #elif defined(SOLARIS)
1398 tty->print ("/usr/bin/sh -c ");
1399 #endif
1400 tty->print_cr("\"%s\"...", cmd);
1401
1402 if (os::fork_and_exec(cmd) < 0) {
1403 tty->print_cr("os::fork_and_exec failed: %s (%s=%d)",
1404 os::strerror(errno), os::errno_name(errno), errno);
1405 }
1406 }
1407 }
1408
1409 void VMError::report_java_out_of_memory(const char* message) {
1410 if (OnOutOfMemoryError && OnOutOfMemoryError[0]) {
1411 MutexLocker ml(Heap_lock);
1412 VM_ReportJavaOutOfMemory op(message);
1413 VMThread::execute(&op);
1414 }
1415 }
1416
1417 void VMError::show_message_box(char *buf, int buflen) {
1418 bool yes;
1419 do {
1420 error_string(buf, buflen);
1421 yes = os::start_debugging(buf,buflen);
1422 } while (yes);
1423 }