static void bt_handler(int sig) {
// In case we crash again in the signal hander or something
signal(sig, SIG_DFL);
IsCrashing = true;
// Generating a stack dumps significant time, try to stop threads
// from flushing bad data or generating more faults meanwhile
if (sig==SIGQUIT || sig==SIGILL || sig==SIGSEGV || sig==SIGBUS) {
LightProcess::Close();
// leave running for SIGTERM SIGFPE SIGABRT
}
if (RuntimeOption::EvalSpinOnCrash) {
char buf[128];
snprintf(buf, 127,
"Crashed. Waiting for debugger to attach pid %d\n", getpid());
buf[127] = 0;
write(STDERR_FILENO, buf, strlen(buf));
for (;;) sleep(1);
}
// Turn on stack traces for coredumps
StackTrace::Enabled = true;
StackTraceNoHeap st;
char pid[sizeof(Process::GetProcessId())*3+2]; // '-' and \0
sprintf(pid,"%u",Process::GetProcessId());
char tracefn[RuntimeOption::CoreDumpReportDirectory.length()
+ strlen("/stacktrace..log") + strlen(pid) + 1];
sprintf(tracefn, "%s/stacktrace.%s.log",
RuntimeOption::CoreDumpReportDirectory.c_str(), pid);
int debuggerCount = RuntimeOption::EnableDebugger ?
Eval::Debugger::CountConnectedProxy() : 0;
st.log(strsignal(sig), tracefn, pid, kCompilerId, debuggerCount);
int fd = ::open(tracefn, O_APPEND|O_WRONLY, S_IRUSR|S_IWUSR);
if (fd >= 0) {
if (!g_context.isNull()) {
dprintf(fd, "\nPHP Stacktrace:\n\n%s",
debug_string_backtrace(false).data());
}
::close(fd);
}
if (!RuntimeOption::CoreDumpEmail.empty()) {
char format [] = "cat %s | mail -s \"Stack Trace from %s\" '%s'";
char cmdline[strlen(format)+strlen(tracefn)
+strlen(Process::GetAppName().c_str())
+strlen(RuntimeOption::CoreDumpEmail.c_str())+1];
sprintf(cmdline, format, tracefn, Process::GetAppName().c_str(),
RuntimeOption::CoreDumpEmail.c_str());
Util::ssystem(cmdline);
}
// Calling all of these library functions in a signal handler
// is completely undefined behavior, but we seem to get away with it.
// Do it last just in case
Logger::Error("Core dumped: %s", strsignal(sig));
// Give the debugger a chance to do extra logging if there are any attached
// debugger clients.
Eval::Debugger::LogShutdown(Eval::Debugger::ShutdownKind::Abnormal);
if (!g_context.isNull()) {
// sync up gdb Dwarf info so that gdb can do a full backtrace
// from the core file. Do this at the very end as syncing needs
// to allocate memory for the ELF file.
g_vmContext->syncGdbState();
}
// re-raise the signal and pass it to the default handler
// to terminate the process.
raise(sig);
}
void f_debug_print_backtrace(int64_t options /* = 0 */,
int64_t limit /* = 0 */) {
bool ignore_args = options & DEBUG_BACKTRACE_IGNORE_ARGS;
echo(debug_string_backtrace(true, ignore_args, limit));
}
void HHVM_FUNCTION(debug_print_backtrace, int64_t options /* = 0 */,
int64_t limit /* = 0 */) {
bool ignore_args = options & k_DEBUG_BACKTRACE_IGNORE_ARGS;
g_context->write(debug_string_backtrace(false, ignore_args, limit));
}
static void bt_handler(int sig) {
// In case we crash again in the signal hander or something
signal(sig, SIG_DFL);
IsCrashing = true;
// Make a stacktrace file to prove we were crashing. Do this before anything
// else has a chance to deadlock us.
int fd = ::open(RuntimeOption::StackTraceFilename.c_str(),
O_CREAT|O_TRUNC|O_WRONLY, S_IRUSR|S_IWUSR);
if (RuntimeOption::EvalDumpRingBufferOnCrash) {
Trace::dumpRingBuffer(RuntimeOption::EvalDumpRingBufferOnCrash);
}
if (RuntimeOption::EvalSpinOnCrash) {
char buf[128];
snprintf(buf, 127,
"Crashed. Waiting for debugger to attach pid %d\n", getpid());
buf[127] = 0;
write(STDERR_FILENO, buf, strlen(buf));
for (;;) sleep(1);
}
if (fd < 0) {
// Nothing to do if we can't write the file
raise(sig);
return;
}
// Turn on stack traces for coredumps
StackTrace::Enabled = true;
static const char* s_newBlacklist[] =
{"_ZN4HPHP16StackTraceNoHeap", "_ZN4HPHPL10bt_handlerEi", "killpg"};
StackTrace::FunctionBlacklist = s_newBlacklist;
StackTrace::FunctionBlacklistCount = 3;
StackTraceNoHeap st;
int debuggerCount = RuntimeOption::EnableDebugger ?
Eval::Debugger::CountConnectedProxy() : 0;
st.log(strsignal(sig), fd, kCompilerId, debuggerCount);
// flush so if php crashes us we still have this output so far
::fsync(fd);
if (fd >= 0) {
if (!g_context.isNull()) {
dprintf(fd, "\nPHP Stacktrace:\n\n%s",
debug_string_backtrace(false).data());
}
::close(fd);
}
if (!RuntimeOption::CoreDumpEmail.empty()) {
char format [] = "cat %s | mail -s \"Stack Trace from %s\" '%s'";
char cmdline[strlen(format)+RuntimeOption::StackTraceFilename.length()
+strlen(Process::GetAppName().c_str())
+strlen(RuntimeOption::CoreDumpEmail.c_str())+1];
sprintf(cmdline, format, RuntimeOption::StackTraceFilename.c_str(),
Process::GetAppName().c_str(),
RuntimeOption::CoreDumpEmail.c_str());
FileUtil::ssystem(cmdline);
}
// Calling all of these library functions in a signal handler
// is completely undefined behavior, but we seem to get away with it.
// Do it last just in case
Logger::Error("Core dumped: %s", strsignal(sig));
// Give the debugger a chance to do extra logging if there are any attached
// debugger clients.
Eval::Debugger::LogShutdown(Eval::Debugger::ShutdownKind::Abnormal);
if (!g_context.isNull()) {
// sync up gdb Dwarf info so that gdb can do a full backtrace
// from the core file. Do this at the very end as syncing needs
// to allocate memory for the ELF file.
g_context->syncGdbState();
}
// re-raise the signal and pass it to the default handler
// to terminate the process.
raise(sig);
}
static void bt_handler(int sig) {
// In case we crash again in the signal hander or something
signal(sig, SIG_DFL);
// Generating a stack dumps significant time, try to stop threads
// from flushing bad data or generating more faults meanwhile
if (sig==SIGQUIT || sig==SIGILL || sig==SIGSEGV || sig==SIGBUS) {
SegFaulting=true;
LightProcess::Close();
// leave running for SIGTERM SIGFPE SIGABRT
}
// Turn on stack traces for coredumps
StackTrace::Enabled = true;
StackTraceNoHeap st;
char pid[sizeof(Process::GetProcessId())*3+2]; // '-' and \0
sprintf(pid,"%u",Process::GetProcessId());
char tracefn[StackTraceBase::ReportDirectory.length()
+ strlen("/stacktrace..log") + strlen(pid) + 1];
sprintf(tracefn, "%s/stacktrace.%s.log",
StackTraceBase::ReportDirectory.c_str(), pid);
st.log(strsignal(sig), tracefn, pid);
int fd = ::open(tracefn, O_APPEND|O_WRONLY, S_IRUSR|S_IWUSR);
if (fd >= 0) {
if (!g_context.isNull()) {
dprintf(fd, "\nPHP Stacktrace:\n\n%s",
debug_string_backtrace(false).data());
}
::close(fd);
}
if (!StackTrace::ReportEmail.empty()) {
char format [] = "cat %s | mail -s \"Stack Trace from %s\" '%s'";
char cmdline[strlen(format)+strlen(tracefn)
+strlen(Process::GetAppName().c_str())
+strlen(StackTrace::ReportEmail.c_str())+1];
sprintf(cmdline, format, tracefn, Process::GetAppName().c_str(),
StackTrace::ReportEmail.c_str());
Util::ssystem(cmdline);
}
// Calling all of these library functions in a signal handler
// is completely undefined behavior, but we seem to get away with it.
// Do it last just in case
Logger::Error("Core dumped: %s", strsignal(sig));
if (hhvm && !g_context.isNull()) {
// sync up gdb Dwarf info so that gdb can do a full backtrace
// from the core file. Do this at the very end as syncing needs
// to allocate memory for the ELF file.
g_vmContext->syncGdbState();
}
// re-raise the signal and pass it to the default handler
// to terminate the process.
raise(sig);
}
void f_debug_print_backtrace() {
echo(debug_string_backtrace(true));
}
static void bt_handler(int sig) {
if (IsCrashing) {
// If we re-enter bt_handler while already crashing, just abort. This
// includes if we hit the timeout set below.
signal(SIGABRT, SIG_DFL);
abort();
}
// TSAN instruments malloc() to make sure it can't be used in signal handlers.
// Unfortunately, we use malloc() all over the place here. This is bad, but
// ends up working most of the time. Just abort so TSAN won't infinite crash
// loop.
if (use_tsan) {
signal(SIGABRT, SIG_DFL);
abort();
}
// In case we crash again in the signal handler or something. Do this before
// setting up the timeout to avoid potential races.
IsCrashing = true;
signal(sig, SIG_DFL);
if (RuntimeOption::StackTraceTimeout > 0) {
signal(SIGALRM, bt_handler);
alarm(RuntimeOption::StackTraceTimeout);
}
// Make a stacktrace file to prove we were crashing. Do this before anything
// else has a chance to deadlock us.
int fd = ::open(RuntimeOption::StackTraceFilename.c_str(),
O_CREAT|O_TRUNC|O_WRONLY, S_IRUSR|S_IWUSR);
if (RuntimeOption::EvalDumpRingBufferOnCrash) {
Trace::dumpRingBuffer(RuntimeOption::EvalDumpRingBufferOnCrash, 0);
}
if (RuntimeOption::EvalSpinOnCrash) {
char buf[128];
snprintf(buf, 127,
"Crashed. Waiting for debugger to attach pid %d\n", getpid());
buf[127] = 0;
write(STDERR_FILENO, buf, strlen(buf));
for (;;) sleep(1);
}
if (fd < 0) {
// Nothing to do if we can't write the file
raise(sig);
return;
}
// Turn on stack traces for coredumps
StackTrace::Enabled = true;
StackTrace::FunctionBlacklist = s_newBlacklist;
StackTrace::FunctionBlacklistCount = 3;
StackTraceNoHeap st;
auto const debuggerCount = [&] {
if (RuntimeOption::EnableDebugger) {
return Eval::Debugger::CountConnectedProxy();
}
// We don't have a count of xdebug clients across all requests, so just
// check the current request.
if (XDebugServer::isAttached()) {
return 1;
}
return 0;
}();
st.log(strsignal(sig), fd, compilerId().begin(), debuggerCount);
// flush so if php crashes us we still have this output so far
::fsync(fd);
if (fd >= 0) {
// Don't attempt to determine function arguments in the PHP backtrace, as
// that might involve re-entering the VM.
if (!g_context.isNull()) {
dprintf(fd, "\nPHP Stacktrace:\n\n%s",
debug_string_backtrace(
/*skip*/false,
/*ignore_args*/true
).data());
}
::close(fd);
}
if (jit::transdb::enabled()) {
jit::tc::dump(true);
}
if (!RuntimeOption::CoreDumpEmail.empty()) {
char format [] = "cat %s | mail -s \"Stack Trace from %s\" '%s'";
char* cmdline = (char*)alloca(sizeof(char) *
(strlen(format)
+RuntimeOption::StackTraceFilename.length()
+strlen(Process::GetAppName().c_str())
+strlen(RuntimeOption::CoreDumpEmail.c_str())+1));
sprintf(cmdline, format, RuntimeOption::StackTraceFilename.c_str(),
Process::GetAppName().c_str(),
RuntimeOption::CoreDumpEmail.c_str());
FileUtil::ssystem(cmdline);
}
// Calling all of these library functions in a signal handler
// is completely undefined behavior, but we seem to get away with it.
// Do it last just in case
Logger::Error("Core dumped: %s", strsignal(sig));
Logger::Error("Stack trace in %s", RuntimeOption::StackTraceFilename.c_str());
// Flush whatever access logs are still pending
Logger::FlushAll();
HttpRequestHandler::GetAccessLog().flushAllWriters();
// Give the debugger a chance to do extra logging if there are any attached
// debugger clients.
Eval::Debugger::LogShutdown(Eval::Debugger::ShutdownKind::Abnormal);
if (!g_context.isNull()) {
// sync up gdb Dwarf info so that gdb can do a full backtrace
// from the core file. Do this at the very end as syncing needs
// to allocate memory for the ELF file.
g_context->syncGdbState();
}
// re-raise the signal and pass it to the default handler
// to terminate the process.
raise(sig);
}