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trigger.c
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/*******************************************************************************
* Copyright IBM Corp. and others 1991
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] https://openjdk.org/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
*******************************************************************************/
/*
* Note: remove this when portlib can supply the current user name
*/
#ifdef WIN32
#include <windows.h>
#include <lmcons.h>
#else
#ifdef J9ZOS390
#include "atoe.h"
#endif
#endif
/* _GNU_SOURCE forces GLIBC_2.0 sscanf/vsscanf/fscanf for RHEL5 compatibility */
#if defined(LINUX) && !defined(J9ZTPF)
#define _GNU_SOURCE
#endif /* defined(__GNUC__) */
#include "dmpsup.h"
#include "j9dmpnls.h"
#include "j9consts.h"
#include "vmaccess.h"
#include "vmhook.h"
#include "mmhook.h"
#include "mmomrhook.h"
#include "rasdump_internal.h"
#include <stdlib.h>
#include <string.h>
#include "j9dump.h"
#include "j9cp.h"
#include "rommeth.h"
#include "objhelp.h"
#include "jvminit.h"
#include "ute.h"
typedef enum J9RASdumpMatchResult
{
J9RAS_DUMP_NO_MATCH = 0,
J9RAS_DUMP_MATCH = 1,
J9RAS_DUMP_FILTER_MISMATCH = 2
} J9RASdumpMatchResult;
#define J9_MAX_JOBNAME 16
#define J9_MAX_DUMP_DETAIL_LENGTH 512
/* Lock words, used to suspend other dumps */
static UDATA rasDumpSuspendKey = 0;
static UDATA rasDumpFirstThread = 0;
/* Postpone GC and thread event hooks until later phases of VM initialization. */
UDATA rasDumpPostponeHooks = \
J9RAS_DUMP_ON_CLASS_UNLOAD | \
J9RAS_DUMP_ON_GLOBAL_GC | \
J9RAS_DUMP_ON_SLOW_EXCLUSIVE_ENTER | \
J9RAS_DUMP_ON_OBJECT_ALLOCATION | \
J9RAS_DUMP_ON_EXCESSIVE_GC | \
J9RAS_DUMP_ON_THREAD_START | \
J9RAS_DUMP_ON_THREAD_BLOCKED | \
J9RAS_DUMP_ON_THREAD_END;
/* Outstanding hook requests - flushed after VM init */
UDATA rasDumpPendingHooks = 0;
/* Cached VM event handlers for use by J9VMRASdumpHooks */
UDATA rasDumpUnhookedEvents = J9RAS_DUMP_ON_ANY;
static void rasDumpHookVmInit (J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData);
static void rasDumpHookGCInitialized(J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData);
static void rasDumpHookAllocationThreshold(J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData);
static void rasDumpHookSlowExclusive (J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData);
static void rasDumpHookThreadStart (J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData);
static void rasDumpHookExceptionDescribe (J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData);
#if (defined(J9VM_GC_DYNAMIC_CLASS_UNLOADING))
static void rasDumpHookClassesUnload (J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData);
#endif /* J9VM_GC_DYNAMIC_CLASS_UNLOADING */
static void rasDumpHookVmShutdown (J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData);
static void rasDumpHookExceptionThrow (J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData);
static void rasDumpHookGlobalGcStart (J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData);
static void rasDumpHookThreadEnd (J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData);
static J9RASdumpMatchResult matchesFilter (J9VMThread *vmThread, J9RASdumpEventData *eventData, UDATA eventFlags, char *filter, char *subFilter);
static void rasDumpHookExceptionSysthrow PROTOTYPE((J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData));
static void rasDumpHookClassLoad (J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData);
static void rasDumpHookExceptionCatch (J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData);
static void rasDumpHookMonitorContendedEnter (J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData);
static void rasDumpHookCorruptCache(J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData);
static void rasDumpHookExcessiveGC(J9HookInterface** hookInterface, UDATA eventNum, void* eventData, void* userData);
#if defined(J9VM_OPT_CRIU_SUPPORT)
static void rasDumpHookCRIUCheckpoint(J9HookInterface **hookInterface, UDATA eventNum, void *eventData, void *userData);
static void rasDumpHookCRIURestore(J9HookInterface **hookInterface, UDATA eventNum, void *eventData, void *userData);
#endif /* defined(J9VM_OPT_CRIU_SUPPORT) */
extern omr_error_t doHeapDump(J9RASdumpAgent *agent, char *label, J9RASdumpContext *context);
extern omr_error_t doSilentDump(J9RASdumpAgent *agent, char *label, J9RASdumpContext *context);
extern omr_error_t doToolDump(J9RASdumpAgent *agent, char *label, J9RASdumpContext *context);
extern void setAllocationThreshold(J9VMThread *vmThread, UDATA min, UDATA max);
struct ExceptionStackFrame
{
J9ROMClass *romClass;
J9ROMMethod *romMethod;
int callStackOffset;
int desiredOffset;
};
static UDATA
countExceptionStackFrame(J9VMThread *vmThread, void *userData, UDATA bytecodeOffset, J9ROMClass *romClass, J9ROMMethod *romMethod, J9UTF8 *fileName, UDATA lineNumber, J9ClassLoader* classLoader, J9Class* ramClass)
{
struct ExceptionStackFrame *frame = (struct ExceptionStackFrame *) userData;
/* Stop and fill in the struct when we have reached the required frame. */
if (frame->callStackOffset++ == frame->desiredOffset) {
frame->romClass = romClass;
frame->romMethod = romMethod;
return FALSE;
}
return TRUE;
}
/**
* Multiply the given 'val' by a suffix character. Supports 'k' and 'm'.
*
* @param[in/out] val - value to update
* @param[in] suffix - suffix character to process
*
* @return one on success, zero on failure
*/
static UDATA multiplyBySuffix(UDATA *val, char suffix)
{
switch (suffix) {
case 'k':
case 'K':
*val *= 1024;
return 1;
case 'm':
case 'M':
*val *= 1024 * 1024;
return 1;
}
return 0;
}
/**
* Parse an allocation range of the form "#5m" or "#5m..6m".
*
* @param[in] range - string containing the range
* @param[out] min - lower bound of the range
* @param[out] max - upper bound of the range (optional).
*
* @return zero on failure, one on success.
*/
UDATA
parseAllocationRange(char *range, UDATA *min, UDATA *max)
{
if (*range != '#') {
return 0;
}
range++;
if (scan_udata(&range, min) != 0) {
/* No matching numeric value */
return 0;
}
if (multiplyBySuffix(min, *range)) {
range++;
}
if (try_scan(&range, "..")) {
if (scan_udata(&range, max) != 0) {
/* No matching numeric value */
return 0;
}
multiplyBySuffix(max, *range);
} else {
*max = UDATA_MAX;
}
if (*min > *max) {
return 0;
}
return 1;
}
static J9RASdumpMatchResult
matchesObjectAllocationFilter(J9RASdumpEventData *eventData, char *filter)
{
char *message = eventData->detailData;
char *msgPtr = NULL;
UDATA msgValue = 0;
char msgText[20];
char *fltPtr = NULL;
UDATA fltValueMin = 0;
UDATA fltValueMax = 0;
char fltText[20];
if (!filter) {
/* Must have a filter for matching object allocation */
return J9RAS_DUMP_NO_MATCH;
}
strncpy(msgText, message, sizeof(msgText) - 1);
msgText[sizeof(msgText) - 1] = '\0';
strncpy(fltText, filter, sizeof(fltText) - 1);
fltText[sizeof(fltText) - 1] = '\0';
/* Convert the message to a number */
msgPtr = msgText;
if (scan_udata(&msgPtr, &msgValue) != 0) {
/* No matching numeric value */
return J9RAS_DUMP_NO_MATCH;
}
/* Convert the filter range to two numbers */
fltPtr = fltText;
if (!parseAllocationRange(fltPtr, &fltValueMin, &fltValueMax)) {
return J9RAS_DUMP_NO_MATCH;
}
/* Do the range check */
if (msgValue >= fltValueMin && msgValue <= fltValueMax) {
return J9RAS_DUMP_MATCH;
}
return J9RAS_DUMP_NO_MATCH;
}
static J9RASdumpMatchResult
matchesSlowExclusiveEnterFilter(J9RASdumpEventData *eventData, char *filter)
{
char *message = eventData->detailData;
char *msgPtr = NULL;
IDATA msgValue = 0;
char msgText[20];
char *fltPtr = NULL;
IDATA fltValue = 0;
char fltText[20];
strncpy(msgText, message, sizeof(msgText) - 1);
msgText[sizeof(msgText) - 1] = '\0';
strncpy(fltText, filter, sizeof(fltText) - 1);
fltText[sizeof(fltText) - 1] = '\0';
/* convert the message value to a number */
msgPtr = msgText;
if (scan_idata(&msgPtr, &msgValue) != 0) {
/* No matching numeric value */
return J9RAS_DUMP_NO_MATCH;
}
/* convert the filter value to a number */
fltPtr = fltText;
if (*fltPtr == '#') {
/* Skip over the leading #, if any. See defect 196215, as well as allowing a leading # (as documented) we are
* deliberately preserving the previous behaviour, which allowed the user to specify filter=<nn>ms, without the #
*/
fltPtr++;
}
if (scan_idata(&fltPtr, &fltValue) != 0) {
/* No matching numeric value */
return J9RAS_DUMP_NO_MATCH;
}
if (strcmp(fltPtr, "ms") != 0) {
/* No matching range */
return J9RAS_DUMP_NO_MATCH;
}
/* compare the filter with the message */
if (msgValue >= fltValue) {
return J9RAS_DUMP_MATCH;
} else {
return J9RAS_DUMP_NO_MATCH;
}
}
static J9RASdumpMatchResult
matchesVMShutdownFilter(J9RASdumpEventData *eventData, char *filter)
{
char *message = eventData->detailData;
IDATA value;
/* Numeric range comparison? */
if (*message != '#') {
return J9RAS_DUMP_NO_MATCH;
}
if (filter && *filter != '#') {
/* Special case: text filter has been applied to a numeric message (ie. vmstop event) */
return J9RAS_DUMP_FILTER_MISMATCH;
}
message++;
/* Number detail encoded as null-terminated hex */
scan_hex(&message, (UDATA *)&value);
/* Match to number ranges encoded in filter string */
while (try_scan(&filter, "#")) {
IDATA lhs, rhs;
scan_idata(&filter, &lhs);
if (try_scan(&filter, "..")) {
scan_idata(&filter, &rhs);
} else {
rhs = lhs;
}
if (lhs <= value && value <= rhs) {
return J9RAS_DUMP_MATCH;
}
}
/* No matching range */
return J9RAS_DUMP_NO_MATCH;
}
static J9RASdumpMatchResult
matchesExceptionFilter(J9VMThread *vmThread, J9RASdumpEventData *eventData, UDATA eventFlags, char *filter, char *subFilter)
{
PORT_ACCESS_FROM_VMC(vmThread);
char *message = eventData->detailData;
UDATA nbytes = eventData->detailLength;
UDATA buflen = 0;
char *buf = NULL;
const char *needleString = NULL;
UDATA needleLength;
U_32 matchFlag;
UDATA retCode = J9RAS_DUMP_NO_MATCH;
if (eventData->exceptionRef && filter != NULL) {
j9object_t exception = *((j9object_t *) eventData->exceptionRef);
char *hashSignInFilter = NULL;
char *stackOffsetFilter = NULL;
struct ExceptionStackFrame throwSite;
throwSite.romClass = NULL;
throwSite.romMethod = NULL;
throwSite.callStackOffset = 0;
throwSite.desiredOffset = 0;
/* Filter an exception event on throw/catch site if the new filter syntax is used */
hashSignInFilter = strrchr((const char *) filter, '#');
if (NULL != hashSignInFilter) {
hashSignInFilter++;
if (*hashSignInFilter >= '0' && *hashSignInFilter <= '9') {
stackOffsetFilter = hashSignInFilter;
sscanf(hashSignInFilter, "%d", &throwSite.desiredOffset);
}
if (eventFlags & J9RAS_DUMP_ON_EXCEPTION_CATCH) {
J9StackWalkState * walkState = vmThread->stackWalkState;
if (NULL != walkState) {
walkState->walkThread = vmThread;
walkState->flags = J9_STACKWALK_INCLUDE_NATIVES | J9_STACKWALK_VISIBLE_ONLY | J9_STACKWALK_COUNT_SPECIFIED;
walkState->skipCount = 0;
walkState->maxFrames = 1;
vmThread->javaVM->walkStackFrames(vmThread, walkState);
if (NULL != walkState->method) {
throwSite.romClass = J9_CLASS_FROM_METHOD(walkState->method)->romClass;
throwSite.romMethod = J9_ROM_METHOD_FROM_RAM_METHOD(walkState->method);
}
}
} else {
/* For other events, walk the stack to find the desired frame */
vmThread->javaVM->internalVMFunctions->iterateStackTrace(vmThread, (j9object_t*) eventData->exceptionRef, countExceptionStackFrame, &throwSite, TRUE, FALSE);
}
}
if (throwSite.romClass && throwSite.romMethod) {
J9UTF8 *exceptionClassName = J9ROMCLASS_CLASSNAME(J9OBJECT_CLAZZ(vmThread, exception)->romClass);
J9UTF8 *throwClassName = J9ROMCLASS_CLASSNAME(throwSite.romClass);
J9UTF8 *throwMethodName = J9ROMMETHOD_NAME(throwSite.romMethod);
if (throwClassName && throwMethodName) {
if (stackOffsetFilter) {
buflen = J9UTF8_LENGTH(exceptionClassName) + J9UTF8_LENGTH(throwClassName) + J9UTF8_LENGTH(throwMethodName) + strlen(stackOffsetFilter) + 3;
} else {
buflen = J9UTF8_LENGTH(exceptionClassName) + J9UTF8_LENGTH(throwClassName) + J9UTF8_LENGTH(throwMethodName) + 2;
}
buf = j9mem_allocate_memory(buflen + 1, OMRMEM_CATEGORY_VM);
if (buf != NULL) {
int end = J9UTF8_LENGTH(exceptionClassName);
memcpy(buf, J9UTF8_DATA(exceptionClassName), J9UTF8_LENGTH(exceptionClassName));
buf[end] = '#';
memcpy(buf + end + 1, J9UTF8_DATA(throwClassName), J9UTF8_LENGTH(throwClassName));
end += J9UTF8_LENGTH(throwClassName) + 1;
buf[end] = '.';
memcpy(buf + end + 1, J9UTF8_DATA(throwMethodName), J9UTF8_LENGTH(throwMethodName));
if (stackOffsetFilter) {
end += J9UTF8_LENGTH(throwMethodName) + 1;
buf[end] = '#';
j9str_printf(PORTLIB, buf + end + 1, buflen - end, "%d", throwSite.desiredOffset);
}
buf[buflen] = '\0';
}
}
}
}
if (buf && buflen) {
message = buf;
nbytes = buflen;
}
/* Apply standard text filter */
if (filter && parseWildcard(filter, strlen(filter), &needleString, &needleLength, &matchFlag) == 0) {
if (wildcardMatch(matchFlag, needleString, needleLength, message, nbytes)) {
retCode = J9RAS_DUMP_MATCH;
} else {
if (buf != NULL) {
j9mem_free_memory(buf);
}
return retCode;
}
}
if (buf != NULL) {
j9mem_free_memory(buf);
buf = NULL;
buflen = 0;
}
if (subFilter && parseWildcard(subFilter, strlen(subFilter), &needleString, &needleLength, &matchFlag) == 0) {
if (eventData->exceptionRef && *eventData->exceptionRef) {
char stackBuffer[256];
j9object_t emessage = J9VMJAVALANGTHROWABLE_DETAILMESSAGE(vmThread, *eventData->exceptionRef);
if (NULL != emessage) {
buf = vmThread->javaVM->internalVMFunctions->copyStringToUTF8WithMemAlloc(vmThread, emessage, J9_STR_NULL_TERMINATE_RESULT, "", 0, stackBuffer, 256, &buflen);
if (NULL != buf) {
if (wildcardMatch(matchFlag, needleString, needleLength, buf, buflen)) {
retCode = J9RAS_DUMP_MATCH;
} else {
retCode = J9RAS_DUMP_NO_MATCH;
}
}
}
if (buf != stackBuffer) {
j9mem_free_memory(buf);
}
}
}
return retCode;
}
static J9RASdumpMatchResult
matchesFilter(J9VMThread *vmThread, J9RASdumpEventData *eventData, UDATA eventFlags, char *filter, char *subFilter)
{
if (eventFlags & J9RAS_DUMP_ON_OBJECT_ALLOCATION) {
/* This comes before the default filter because object allocation MUST have a filter */
return matchesObjectAllocationFilter(eventData, filter);
}
/* For exception specific events the filter and subfilter default(null) matches to all
* For non exception specific events the filter default(null) matches to all
*/
if (((0 != (eventFlags & J9RAS_DUMP_EXCEPTION_EVENT_GROUP)) && NULL == filter && NULL == subFilter) ||
((0 == (eventFlags & J9RAS_DUMP_EXCEPTION_EVENT_GROUP)) && NULL == filter))
{
return J9RAS_DUMP_MATCH;
}
if (eventFlags & J9RAS_DUMP_ON_SLOW_EXCLUSIVE_ENTER) {
return matchesSlowExclusiveEnterFilter(eventData, filter);
} else if (eventFlags & J9RAS_DUMP_ON_VM_SHUTDOWN) {
return matchesVMShutdownFilter(eventData, filter);
} else if (0 != (eventFlags & (J9RAS_DUMP_EXCEPTION_EVENT_GROUP | J9RAS_DUMP_ON_CLASS_LOAD))) {
return matchesExceptionFilter(vmThread, eventData, eventFlags, filter, subFilter);
}
return J9RAS_DUMP_NO_MATCH;
}
omr_error_t
printLabelSpec(struct J9JavaVM *vm)
{
PORT_ACCESS_FROM_JAVAVM(vm);
/* Since j9tty_err_printf() is a function macro, #ifdefs can't be used in
* its argument list.
*/
const char *labelSpec =
" %%Y year 1900..????\n"
" %%y century 00..99\n"
" %%m month 01..12\n"
" %%d day 01..31\n"
" %%H hour 00..23\n"
" %%M minute 00..59\n"
" %%S second 00..59\n"
"\n"
" %%pid process id\n"
" %%uid user name\n"
#ifdef J9ZOS390
" %%job job name\n"
" %%jobid job ID\n"
" %%asid ASID\n"
#endif
" %%seq dump counter\n"
" %%tick msec counter\n"
" %%home java home\n"
" %%last last dump\n"
" %%event dump event\n"
"\n";
j9tty_err_printf(PORTLIB, labelSpec);
return OMR_ERROR_NONE;
}
UDATA
prepareForDump(struct J9JavaVM *vm, struct J9RASdumpAgent *agent, struct J9RASdumpContext *context, UDATA state)
{
UDATA dumpKey = 1 + (UDATA)omrthread_self();
J9VMThread *vmThread = context->onThread;
UDATA newState = state;
RasGlobalStorage * j9ras = (RasGlobalStorage *)vm->j9rasGlobalStorage;
UtInterface * uteInterface = (UtInterface *)(j9ras ? j9ras->utIntf : NULL);
BOOLEAN exclusiveHeld = J9_XACCESS_NONE != vm->exclusiveAccessState;
BOOLEAN acquireVMAccessAfterWait = FALSE;
/* Is trace running? */
if( uteInterface && uteInterface->server ) {
/* Disable trace while taking a dump. */
uteInterface->server->DisableTrace(UT_DISABLE_GLOBAL);
newState |= J9RAS_DUMP_TRACE_DISABLED;
}
/* Release vm access until this thread has the dumpKey and is ready to run. This will allow other threads to obtain exclusiveVMAccess in the meantime. */
if ((NULL != vmThread) && !vmThread->inNative) {
if (J9_ARE_ANY_BITS_SET(vmThread->publicFlags, J9_PUBLIC_FLAGS_VM_ACCESS)) {
vm->internalVMFunctions->internalReleaseVMAccess(vmThread);
acquireVMAccessAfterWait = TRUE;
}
}
/*
* The following actions are considered safe to call during a crash situation...
*/
/* For fatal events, the first failing thread sets the global rasDumpFirstThread. It then gets higher priority on the
* serial dump lock, see below. This allows the first failing thread to complete its dumps and exit the VM, reducing
* the number of dumps written and out-time if multiple threads crash.
*/
if (J9_ARE_ANY_BITS_SET(context->eventFlags, J9RAS_DUMP_ON_GP_FAULT | J9RAS_DUMP_ON_ABORT_SIGNAL | J9RAS_DUMP_ON_TRACE_ASSERT)) {
compareAndSwapUDATA(&rasDumpFirstThread, 0, dumpKey);
}
if (rasDumpSuspendKey == dumpKey) {
/* We already have the lock */
} else {
UDATA newKey = 0;
/* Grab the dump lock? */
if (J9_ARE_ANY_BITS_SET(agent->requestMask, J9RAS_DUMP_DO_SUSPEND_OTHER_DUMPS)) {
newState |= J9RAS_DUMP_GOT_LOCK;
newKey = dumpKey;
}
/* Always wait for the lock, but only grab it when requested */
while (0 != compareAndSwapUDATA(&rasDumpSuspendKey, 0, newKey)) {
if (rasDumpFirstThread == dumpKey) {
/* First failing thread gets a simple priority boost over other threads waiting for lock */
omrthread_sleep(20);
} else {
omrthread_sleep(200);
}
}
}
if (acquireVMAccessAfterWait) {
vm->internalVMFunctions->internalAcquireVMAccess(vmThread);
}
if (J9_ARE_NO_BITS_SET(context->eventFlags, J9RAS_DUMP_ON_GP_FAULT | J9RAS_DUMP_ON_ABORT_SIGNAL | J9RAS_DUMP_ON_TRACE_ASSERT)) {
/*
* The following actions may deadlock, so don't use them
* if this is a crash situation or a trace assertion.
*/
/* Share exclusive access when it's a "slow entry" or "user" event, as there may be a deadlock */
UDATA shareVMAccess = exclusiveHeld
&& OMR_ARE_ANY_BITS_SET(context->eventFlags, J9RAS_DUMP_ON_USER_SIGNAL | J9RAS_DUMP_ON_SLOW_EXCLUSIVE_ENTER);
if ( shareVMAccess == 0 ) {
/* Deferred attach of SigQuit thread, needed if we're preparing to walk the heap (GC pre-req) */
if (OMR_ARE_ANY_BITS_SET(agent->requestMask, J9RAS_DUMP_DO_PREPARE_HEAP_FOR_WALK | J9RAS_DUMP_DO_COMPACT_HEAP | J9RAS_DUMP_DO_ATTACH_THREAD)
&& OMR_ARE_ANY_BITS_SET(context->eventFlags, J9RAS_DUMP_ON_USER_SIGNAL | J9RAS_DUMP_ON_USER2_SIGNAL)
) {
JavaVMAttachArgs attachArgs;
attachArgs.version = JNI_VERSION_1_2;
attachArgs.name = "SIGQUIT Thread";
attachArgs.group = NULL;
if (!vmThread) {
vm->internalVMFunctions->AttachCurrentThreadAsDaemon((JavaVM *)vm, (void **)&vmThread, &attachArgs);
context->onThread = vmThread;
newState |= J9RAS_DUMP_ATTACHED_THREAD;
} else {
/* already attached, don't set flag to detach us on way out of heapdump! */
}
}
if ( (agent->requestMask & J9RAS_DUMP_DO_EXCLUSIVE_VM_ACCESS) &&
(state & J9RAS_DUMP_GOT_EXCLUSIVE_VM_ACCESS) == 0 ) {
if (vmThread) {
#if defined(J9VM_INTERP_ATOMIC_FREE_JNI)
if (vmThread->inNative) {
vm->internalVMFunctions->internalEnterVMFromJNI(vmThread);
newState |= J9RAS_DUMP_GOT_JNI_VM_ACCESS;
} else
#endif /* J9VM_INTERP_ATOMIC_FREE_JNI */
if ((vmThread->publicFlags & J9_PUBLIC_FLAGS_VM_ACCESS) == 0) {
vm->internalVMFunctions->internalAcquireVMAccess(vmThread);
newState |= J9RAS_DUMP_GOT_VM_ACCESS;
}
vm->internalVMFunctions->acquireExclusiveVMAccess(vmThread);
} else {
vm->internalVMFunctions->acquireExclusiveVMAccessFromExternalThread(vm);
}
newState |= J9RAS_DUMP_GOT_EXCLUSIVE_VM_ACCESS;
}
}
}
if ( (agent->requestMask & J9RAS_DUMP_DO_COMPACT_HEAP) &&
((state & J9RAS_DUMP_HEAP_COMPACTED) == 0 ) ) {
/* If exclusive access has been obtained, do the requested compaction */
if ((newState & J9RAS_DUMP_GOT_EXCLUSIVE_VM_ACCESS) && (vmThread != 0)) {
J9RASdumpEventData *eventData = context->eventData;
/* Don't try and compact the heap if it may cause recursion in GC */
UDATA gcEvent =
(context->eventFlags & J9RAS_DUMP_ON_GLOBAL_GC) ||
(context->eventFlags & J9RAS_DUMP_ON_CLASS_UNLOAD) ||
(context->eventFlags & J9RAS_DUMP_ON_EXCESSIVE_GC) ||
(eventData && matchesFilter(vmThread, eventData, context->eventFlags, "*OutOfMemoryError", NULL) == J9RAS_DUMP_MATCH) ||
/* Tracepoint trigger when exclusive is held also indicates we may be in GC */
(eventData && eventData->detailData && strcmp(eventData->detailData,"-Xtrace:trigger") == 0 && exclusiveHeld);
/*
* The extra check of this runtime flag is to defer invoking GC till class objects are assigned during startup;
* otherwise NULL class objects would be captured by GC assertion.
*/
if ( J9_ARE_ALL_BITS_SET(vm->extendedRuntimeFlags, J9_EXTENDED_RUNTIME_CLASS_OBJECT_ASSIGNED) && !gcEvent ) {
vm->memoryManagerFunctions->j9gc_modron_global_collect_with_overrides(vmThread, J9MMCONSTANT_EXPLICIT_GC_RASDUMP_COMPACT);
newState |= J9RAS_DUMP_HEAP_COMPACTED;
}
}
}
if ( (agent->requestMask & J9RAS_DUMP_DO_PREPARE_HEAP_FOR_WALK) &&
((state & J9RAS_DUMP_HEAP_PREPARED) == 0 ) ) {
/* If exclusive access has been obtained, do the requested preparation */
if (newState & J9RAS_DUMP_GOT_EXCLUSIVE_VM_ACCESS) {
vm->memoryManagerFunctions->j9gc_flush_caches_for_walk(vm);
vm->memoryManagerFunctions->j9gc_flush_nonAllocationCaches_for_walk(vm);
newState |= J9RAS_DUMP_HEAP_PREPARED;
}
}
return newState;
}
UDATA
unwindAfterDump(struct J9JavaVM *vm, struct J9RASdumpContext *context, UDATA state)
{
UDATA dumpKey = 1 + (UDATA)omrthread_self();
J9VMThread *vmThread = context->onThread;
UDATA newState = state;
/*
* Must be in reverse order to the requested actions
*/
if (state & J9RAS_DUMP_GOT_EXCLUSIVE_VM_ACCESS) {
if (vmThread) {
vm->internalVMFunctions->releaseExclusiveVMAccess(vmThread);
#if defined(J9VM_INTERP_ATOMIC_FREE_JNI)
if (state & J9RAS_DUMP_GOT_JNI_VM_ACCESS) {
vm->internalVMFunctions->internalExitVMToJNI(vmThread);
newState &= ~J9RAS_DUMP_GOT_JNI_VM_ACCESS;
} else
#endif /* J9VM_INTERP_ATOMIC_FREE_JNI */
if (state & J9RAS_DUMP_GOT_VM_ACCESS) {
vm->internalVMFunctions->internalReleaseVMAccess(vmThread);
newState &= ~J9RAS_DUMP_GOT_VM_ACCESS;
}
} else {
vm->internalVMFunctions->releaseExclusiveVMAccessFromExternalThread(vm);
}
/* Releasing exclusive access potentially invalidates the state of the heap... */
newState &= ~( J9RAS_DUMP_GOT_EXCLUSIVE_VM_ACCESS | J9RAS_DUMP_HEAP_COMPACTED | J9RAS_DUMP_HEAP_PREPARED );
}
if (state & J9RAS_DUMP_ATTACHED_THREAD) {
(*((JavaVM *)vm))->DetachCurrentThread((JavaVM *)vm);
context->onThread = NULL;
newState &= ~J9RAS_DUMP_ATTACHED_THREAD;
}
if (state & J9RAS_DUMP_GOT_LOCK) {
/* Should work unless omrthread_self returns a different value than before, which is unlikely */
compareAndSwapUDATA(&rasDumpSuspendKey, dumpKey, 0);
newState &= ~J9RAS_DUMP_GOT_LOCK;
}
if( state & J9RAS_DUMP_TRACE_DISABLED) {
RasGlobalStorage * j9ras = (RasGlobalStorage *)vm->j9rasGlobalStorage;
UtInterface * uteInterface = (UtInterface *)(j9ras ? j9ras->utIntf : NULL);
/* Is trace running? */
if( uteInterface && uteInterface->server ) {
/* Re-enable trace now we are out of the dump code.*/
uteInterface->server->EnableTrace(UT_ENABLE_GLOBAL);
newState &= ~J9RAS_DUMP_TRACE_DISABLED;
}
}
return newState;
}
/*
* Function : dumpLabel()
* Convert a dump label template into an actual dump label by expanding all the tokens.
*
* Parameters:
* vm [in] - VM structure pointer
* agent - dump agent pointer
* context - dump context pointer
* buf [in/out] - memory buffer for expanded label
* len [in] - length of supplied buffer
* reqLen [out] - length of buffer required, if expansion would have overflowed buf
* now [in] - current time
*
* Returns: OMR_ERROR_NONE, OMR_ERROR_INTERNAL, OMR_ERROR_OUT_OF_NATIVE_MEMORY
*/
omr_error_t
dumpLabel(struct J9JavaVM *vm, J9RASdumpAgent *agent, J9RASdumpContext *context, char *buf, size_t len, UDATA *reqLen, I_64 now)
{
/* Monotonic counter */
static UDATA seqNum = 0;
struct J9StringTokens *stringTokens;
RasDumpGlobalStorage *dump_storage = (RasDumpGlobalStorage *)vm->j9rasdumpGlobalStorage;
PORT_ACCESS_FROM_JAVAVM(vm);
/* access the rasdump global storage */
if (NULL == dump_storage) {
return OMR_ERROR_INTERNAL;
}
/* lock access to the tokens */
omrthread_monitor_enter(dump_storage->dumpLabelTokensMutex);
stringTokens = dump_storage->dumpLabelTokens;
j9str_set_time_tokens(stringTokens, now);
seqNum += 1; /* Atomicity guaranteed as we are inside the dumpLabelTokensMutex */
if (j9str_set_token(PORTLIB, stringTokens, "seq", "%04u", seqNum)) {
omrthread_monitor_exit(dump_storage->dumpLabelTokensMutex);
return OMR_ERROR_INTERNAL;
}
if (j9str_set_token(PORTLIB, stringTokens, "home", "%s", (vm->javaHome == NULL) ? "" : (char *)vm->javaHome)) {
omrthread_monitor_exit(dump_storage->dumpLabelTokensMutex);
return OMR_ERROR_INTERNAL;
}
if (j9str_set_token(PORTLIB, stringTokens, "event", "%s", mapDumpEvent(context->eventFlags))) {
omrthread_monitor_exit(dump_storage->dumpLabelTokensMutex);
return OMR_ERROR_INTERNAL;
}
if (j9str_set_token(PORTLIB, stringTokens, "list", "%s", (context->dumpList == NULL) ? "" : context->dumpList)) {
omrthread_monitor_exit(dump_storage->dumpLabelTokensMutex);
return OMR_ERROR_INTERNAL;
}
/* %vmbin is not listed in printLabelSpec as it is only useful for loading internal tools that live in the vm directory. */
if (j9str_set_token(PORTLIB, stringTokens, "vmbin", "%s", (vm->j2seRootDirectory == NULL) ? "" : (char *)vm->j2seRootDirectory)) {
omrthread_monitor_exit(dump_storage->dumpLabelTokensMutex);
return OMR_ERROR_INTERNAL;
}
/* Default label is "-", ie. stderr */
if (agent->labelTemplate == NULL) {
agent->labelTemplate = "-";
}
/* Check the return value here to see if token expansion fitted in the buffer */
*reqLen = j9str_subst_tokens(buf, len, agent->labelTemplate, stringTokens);
if (*reqLen > len) {
omrthread_monitor_exit(dump_storage->dumpLabelTokensMutex);
return OMR_ERROR_OUT_OF_NATIVE_MEMORY;
}
if (agent->dumpFn != doToolDump ) {
/* Cache last dump label (but not for tool dumps!) */
if (j9str_set_token(PORTLIB, stringTokens, "last", "%s", buf)) {
omrthread_monitor_exit(dump_storage->dumpLabelTokensMutex);
return OMR_ERROR_INTERNAL;
}
}
/* release access to the tokens */
omrthread_monitor_exit(dump_storage->dumpLabelTokensMutex);
return OMR_ERROR_NONE;
}
omr_error_t
triggerOneOffDump(struct J9JavaVM *vm, char *optionString, char *caller, char *fileName, size_t fileNameLength)
{
IDATA kind;
omr_error_t retVal = OMR_ERROR_INTERNAL;
size_t len;
if( optionString == NULL ) {
return OMR_ERROR_INTERNAL;
}
kind = scanDumpType(&optionString);
if ( kind >= 0 ) {
J9RASdumpContext context;
J9RASdumpEventData eventData;
/* we lock the dump configuration here so that the agent and setting queues can't be
* changed underneath us while we're producing the dumps
*/
lockConfigForUse();
/* Construct a pseudo-context */
context.javaVM = vm;
context.onThread = vm->internalVMFunctions->currentVMThread(vm);
context.eventFlags = J9RAS_DUMP_ON_USER_REQUEST;
context.eventData = &eventData;
context.dumpList = fileName;
context.dumpListSize = fileNameLength;
context.dumpListIndex = 0;
eventData.detailData = caller;
if (caller != NULL) {
eventData.detailLength = strlen(caller);
} else {
eventData.detailLength = 0;
}
eventData.exceptionRef = NULL;
retVal = createAndRunOneOffDumpAgent(vm,&context,kind,optionString);
/* Remove the trailing tab added to the filename as a separator, it's only
* used for multiple dumps and will confuse the caller.
*/
if( fileName ) {
len = strlen(fileName);
} else {
len = 0;
}
if( len > 0 && len <= fileNameLength) {
if( fileName[len-1] == '\t') {
fileName[len-1] = '\0';
}
}
/* Allow configuration updates again */
unlockConfig();
}
return retVal;
}
omr_error_t
triggerDumpAgents(struct J9JavaVM *vm, struct J9VMThread *self, UDATA eventFlags, struct J9RASdumpEventData *eventData)
{
J9RASdumpQueue *queue;
/* we lock the dump configuration here so that the agent and setting queues can't be
* changed underneath us while we're producing the dumps
*/
lockConfigForUse();
/*
* Sanity check
*/
if ( FIND_DUMP_QUEUE(vm, queue) ) {
J9RASdumpAgent *node;
PORT_ACCESS_FROM_JAVAVM(vm);
U_32 dumpTaken = 0;
U_32 printed = 0;
BOOLEAN toolDumpFound = FALSE;
IDATA dumpAgentCount = 0;
UDATA state = 0;
U_64 now = j9time_current_time_millis();
UDATA detailLength = eventData ? eventData->detailLength : 0;
char *detailData = detailLength ? eventData->detailData : "";
char detailBuf[J9_MAX_DUMP_DETAIL_LENGTH + 1];
J9RASdumpContext context;
context.javaVM = vm;
context.onThread = self;
context.eventFlags = eventFlags;
context.eventData = eventData;
context.dumpList = NULL;
context.dumpListSize = 0;
context.dumpListIndex = 0;
if (detailLength > J9_MAX_DUMP_DETAIL_LENGTH) {
detailLength = J9_MAX_DUMP_DETAIL_LENGTH;
}
strncpy(detailBuf, detailData, detailLength);
detailBuf[detailLength] = '\0';
/* Scan the dump agents first to see if we need to provide a dump list for tool agents */
for ( node = queue->agents; node != NULL; node = node->nextPtr ) {
if ( eventFlags & node->eventMask ) {
if ( node->dumpFn == doToolDump ) {
toolDumpFound = TRUE;
} else {
/* count number of agents for this event, not including tool dumps themselves */
dumpAgentCount++;
if (node->dumpFn == doHeapDump && strstr(node->dumpOptions, "CLASSIC") && strstr(node->dumpOptions, "PHD")) {
/* fake up a slot for the dual dump */
dumpAgentCount++;
}
}
}
}
if (toolDumpFound && (dumpAgentCount > 0)) {
/* there is a tool dump, so allocate a buffer for the list of dump labels. Need to account for the \t separators and \0 */
context.dumpListSize = ((J9_MAX_DUMP_PATH +1) * dumpAgentCount) + 1;
context.dumpList = j9mem_allocate_memory(context.dumpListSize, OMRMEM_CATEGORY_VM);
if (context.dumpList) {
memset(context.dumpList, 0, context.dumpListSize);
}
}
/* Trigger agents for this event, in priority order */
for ( node = queue->agents; node != NULL; node = node->nextPtr ) {
if ( eventFlags & node->eventMask ) {
/* NOTE: we allow trigger on filter mismatch (ie. exception text filter applied to vmstop exit code) */
if (NULL == eventData || matchesFilter(self, eventData, eventFlags, node->detailFilter, node->subFilter) != J9RAS_DUMP_NO_MATCH) {
/* increment count, but don't go past stopOnCount for a finite range */
UDATA oldCount = node->count;
UDATA newCount = oldCount + 1;
while ((newCount <= node->stopOnCount) || (node->stopOnCount < node->startOnCount)) {
UDATA current = compareAndSwapUDATA(&node->count, oldCount, newCount);
if (current == oldCount) {
/* increment was successful */
break;
}
oldCount = current;
newCount = current + 1;
}