-/* Copyright (c) 2008-2021. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2008-2023. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
#include "src/mc/ModelChecker.hpp"
-#include "src/mc/Session.hpp"
-#include "src/mc/Transition.hpp"
-#include "src/mc/checker/Checker.hpp"
+#include "src/mc/explo/Exploration.hpp"
+#include "src/mc/explo/LivenessChecker.hpp"
#include "src/mc/mc_config.hpp"
#include "src/mc/mc_exit.hpp"
#include "src/mc/mc_private.hpp"
-#include "src/mc/remote/RemoteSimulation.hpp"
+#include "src/mc/remote/RemoteProcess.hpp"
+#include "src/mc/transition/TransitionComm.hpp"
#include "xbt/automaton.hpp"
#include "xbt/system_error.hpp"
#include <array>
+#include <csignal>
#include <sys/ptrace.h>
#include <sys/wait.h>
::simgrid::mc::ModelChecker* mc_model_checker = nullptr;
-using simgrid::mc::remote;
-
#ifdef __linux__
# define WAITPID_CHECKED_FLAGS __WALL
#else
# define WAITPID_CHECKED_FLAGS 0
#endif
-namespace simgrid {
-namespace mc {
+namespace simgrid::mc {
-ModelChecker::ModelChecker(std::unique_ptr<RemoteSimulation> remote_simulation, int sockfd)
- : checker_side_(sockfd), remote_simulation_(std::move(remote_simulation))
+ModelChecker::ModelChecker(std::unique_ptr<RemoteProcess> remote_simulation, int sockfd)
+ : checker_side_(sockfd), remote_process_(std::move(remote_simulation))
{
}
void ModelChecker::start()
{
- checker_side_.start([](evutil_socket_t sig, short events, void* arg) {
- auto mc = static_cast<simgrid::mc::ModelChecker*>(arg);
- if (events == EV_READ) {
- std::array<char, MC_MESSAGE_LENGTH> buffer;
- ssize_t size = mc->checker_side_.get_channel().receive(buffer.data(), buffer.size(), false);
- if (size == -1 && errno != EAGAIN)
- throw simgrid::xbt::errno_error();
-
- if (not mc->handle_message(buffer.data(), size))
- mc->checker_side_.break_loop();
- } else if (events == EV_SIGNAL) {
- if (sig == SIGCHLD)
- mc->handle_waitpid();
- } else {
- xbt_die("Unexpected event");
- }
- });
+ checker_side_.start(
+ [](evutil_socket_t sig, short events, void* arg) {
+ auto mc = static_cast<simgrid::mc::ModelChecker*>(arg);
+ if (events == EV_READ) {
+ std::array<char, MC_MESSAGE_LENGTH> buffer;
+ ssize_t size = mc->checker_side_.get_channel().receive(buffer.data(), buffer.size(), false);
+ if (size == -1 && errno != EAGAIN)
+ throw simgrid::xbt::errno_error();
+
+ if (not mc->handle_message(buffer.data(), size))
+ mc->checker_side_.break_loop();
+ } else if (events == EV_SIGNAL) {
+ if (sig == SIGCHLD)
+ mc->handle_waitpid();
+ } else {
+ xbt_die("Unexpected event");
+ }
+ },
+ this);
XBT_DEBUG("Waiting for the model-checked process");
int status;
// The model-checked process SIGSTOP itself to signal it's ready:
- const pid_t pid = remote_simulation_->pid();
+ const pid_t pid = remote_process_->pid();
- pid_t res = waitpid(pid, &status, WAITPID_CHECKED_FLAGS);
- if (res < 0 || not WIFSTOPPED(status) || WSTOPSIG(status) != SIGSTOP)
- xbt_die("Could not wait model-checked process");
+ xbt_assert(waitpid(pid, &status, WAITPID_CHECKED_FLAGS) == pid && WIFSTOPPED(status) && WSTOPSIG(status) == SIGSTOP,
+ "Could not wait model-checked process");
- remote_simulation_->init();
+ if (not _sg_mc_dot_output_file.get().empty()) {
+ dot_output_ = fopen(_sg_mc_dot_output_file.get().c_str(), "w");
+ xbt_assert(dot_output_ != nullptr, "Error open dot output file: %s", strerror(errno));
- if (not _sg_mc_dot_output_file.get().empty())
- MC_init_dot_output();
+ fprintf(dot_output_, "digraph graphname{\n fixedsize=true; rankdir=TB; ranksep=.25; edge [fontsize=12]; node "
+ "[fontsize=10, shape=circle,width=.5 ]; graph [resolution=20, fontsize=10];\n");
+ }
setup_ignore();
+ errno = 0;
#ifdef __linux__
ptrace(PTRACE_SETOPTIONS, pid, nullptr, PTRACE_O_TRACEEXIT);
ptrace(PTRACE_CONT, pid, 0, 0);
#else
# error "no ptrace equivalent coded for this platform"
#endif
+ xbt_assert(errno == 0,
+ "Ptrace does not seem to be usable in your setup (errno: %d). "
+ "If you run from within a docker, adding `--cap-add SYS_PTRACE` to the docker line may help. "
+ "If it does not help, please report this bug.",
+ errno);
+}
+
+void ModelChecker::dot_output(const char* fmt, ...)
+{
+ if (dot_output_ != nullptr) {
+ va_list ap;
+ va_start(ap, fmt);
+ vfprintf(dot_output_, fmt, ap);
+ va_end(ap);
+ }
}
static constexpr auto ignored_local_variables = {
void ModelChecker::setup_ignore()
{
- const RemoteSimulation& process = this->get_remote_simulation();
- for (auto const& var : ignored_local_variables)
- process.ignore_local_variable(var.first, var.second);
+ const RemoteProcess& process = this->get_remote_process();
+ for (auto const& [var, frame] : ignored_local_variables)
+ process.ignore_local_variable(var, frame);
/* Static variable used for tracing */
process.ignore_global_variable("counter");
{
XBT_DEBUG("Shutting down model-checker");
- RemoteSimulation* process = &this->get_remote_simulation();
- if (process->running()) {
+ RemoteProcess& process = get_remote_process();
+ if (process.running()) {
XBT_DEBUG("Killing process");
- kill(process->pid(), SIGKILL);
- process->terminate();
+ finalize_app(true);
+ kill(process.pid(), SIGKILL);
+ process.terminate();
}
}
-void ModelChecker::resume(RemoteSimulation& process)
+void ModelChecker::resume()
{
- int res = checker_side_.get_channel().send(MessageType::CONTINUE);
- if (res)
+ if (checker_side_.get_channel().send(MessageType::CONTINUE) != 0)
throw xbt::errno_error();
- process.clear_cache();
+ remote_process_->clear_cache();
}
-static void MC_report_crash(int status)
+static void MC_report_crash(Exploration* explorer, int status)
{
XBT_INFO("**************************");
XBT_INFO("** CRASH IN THE PROGRAM **");
XBT_INFO("From exit: %i", WEXITSTATUS(status));
if (not xbt_log_no_loc)
XBT_INFO("%s core dump was generated by the system.", WCOREDUMP(status) ? "A" : "No");
- XBT_INFO("Counter-example execution trace:");
- for (auto const& s : mc_model_checker->getChecker()->get_textual_trace())
- XBT_INFO(" %s", s.c_str());
- dumpRecordPath();
- session->log_state();
- if (xbt_log_no_loc) {
- XBT_INFO("Stack trace not displayed because you passed --log=no_loc");
- } else {
- XBT_INFO("Stack trace:");
- mc_model_checker->get_remote_simulation().dump_stack();
+ if (explorer) {
+ XBT_INFO("Counter-example execution trace:");
+ for (auto const& s : explorer->get_textual_trace())
+ XBT_INFO(" %s", s.c_str());
+ XBT_INFO("You can debug the problem (and see the whole details) by rerunning out of simgrid-mc with "
+ "--cfg=model-check/replay:'%s'",
+ explorer->get_record_trace().to_string().c_str());
+ explorer->log_state();
+ if (xbt_log_no_loc) {
+ XBT_INFO("Stack trace not displayed because you passed --log=no_loc");
+ } else {
+ XBT_INFO("Stack trace:");
+ mc_model_checker->get_remote_process().dump_stack();
+ }
}
}
-static void MC_report_assertion_error()
-{
- XBT_INFO("**************************");
- XBT_INFO("*** PROPERTY NOT VALID ***");
- XBT_INFO("**************************");
- XBT_INFO("Counter-example execution trace:");
- for (auto const& s : mc_model_checker->getChecker()->get_textual_trace())
- XBT_INFO(" %s", s.c_str());
- dumpRecordPath();
- session->log_state();
-}
-
bool ModelChecker::handle_message(const char* buffer, ssize_t size)
{
s_mc_message_t base_message;
memcpy(&base_message, buffer, sizeof(base_message));
switch(base_message.type) {
+ case MessageType::INITIAL_ADDRESSES: {
+ s_mc_message_initial_addresses_t message;
+ xbt_assert(size == sizeof(message), "Broken message. Got %d bytes instead of %d.", (int)size, (int)sizeof(message));
+ memcpy(&message, buffer, sizeof(message));
+
+ get_remote_process().init(message.mmalloc_default_mdp, message.maxpid);
+ break;
+ }
+
case MessageType::IGNORE_HEAP: {
s_mc_message_ignore_heap_t message;
xbt_assert(size == sizeof(message), "Broken message");
region.fragment = message.fragment;
region.address = message.address;
region.size = message.size;
- get_remote_simulation().ignore_heap(region);
+ get_remote_process().ignore_heap(region);
break;
}
s_mc_message_ignore_memory_t message;
xbt_assert(size == sizeof(message), "Broken message");
memcpy(&message, buffer, sizeof(message));
- get_remote_simulation().unignore_heap((void*)(std::uintptr_t)message.addr, message.size);
+ get_remote_process().unignore_heap((void*)(std::uintptr_t)message.addr, message.size);
break;
}
s_mc_message_ignore_memory_t message;
xbt_assert(size == sizeof(message), "Broken message");
memcpy(&message, buffer, sizeof(message));
- this->get_remote_simulation().ignore_region(message.addr, message.size);
+ this->get_remote_process().ignore_region(message.addr, message.size);
break;
}
s_mc_message_stack_region_t message;
xbt_assert(size == sizeof(message), "Broken message");
memcpy(&message, buffer, sizeof(message));
- this->get_remote_simulation().stack_areas().push_back(message.stack_region);
+ this->get_remote_process().stack_areas().push_back(message.stack_region);
} break;
case MessageType::REGISTER_SYMBOL: {
xbt_assert(not message.callback, "Support for client-side function proposition is not implemented.");
XBT_DEBUG("Received symbol: %s", message.name.data());
- if (property_automaton == nullptr)
- property_automaton = xbt_automaton_new();
-
- const RemoteSimulation* process = &this->get_remote_simulation();
- RemotePtr<int> address = remote((int*)message.data);
- xbt::add_proposition(property_automaton, message.name.data(),
- [process, address]() { return process->read(address); });
-
+ LivenessChecker::automaton_register_symbol(get_remote_process(), message.name.data(), remote((int*)message.data));
break;
}
return false;
case MessageType::ASSERTION_FAILED:
- MC_report_assertion_error();
+ XBT_INFO("**************************");
+ XBT_INFO("*** PROPERTY NOT VALID ***");
+ XBT_INFO("**************************");
+ XBT_INFO("Counter-example execution trace:");
+ for (auto const& s : get_exploration()->get_textual_trace())
+ XBT_INFO(" %s", s.c_str());
+ XBT_INFO("You can debug the problem (and see the whole details) by rerunning out of simgrid-mc with "
+ "--cfg=model-check/replay:'%s'",
+ get_exploration()->get_record_trace().to_string().c_str());
+ exploration_->log_state();
+
this->exit(SIMGRID_MC_EXIT_SAFETY);
default:
/** Terminate the model-checker application */
void ModelChecker::exit(int status)
{
- // TODO, terminate the model checker politely instead of exiting rudely
- if (get_remote_simulation().running())
- kill(get_remote_simulation().pid(), SIGKILL);
+ shutdown();
::exit(status);
}
if (pid == -1) {
if (errno == ECHILD) {
// No more children:
- xbt_assert(not this->get_remote_simulation().running(), "Inconsistent state");
+ xbt_assert(not this->get_remote_process().running(), "Inconsistent state");
break;
} else {
XBT_ERROR("Could not wait for pid");
}
}
- if (pid == this->get_remote_simulation().pid()) {
+ if (pid == this->get_remote_process().pid()) {
// From PTRACE_O_TRACEEXIT:
#ifdef __linux__
if (status>>8 == (SIGTRAP | (PTRACE_EVENT_EXIT<<8))) {
- xbt_assert(ptrace(PTRACE_GETEVENTMSG, remote_simulation_->pid(), 0, &status) != -1,
- "Could not get exit status");
+ xbt_assert(ptrace(PTRACE_GETEVENTMSG, remote_process_->pid(), 0, &status) != -1, "Could not get exit status");
if (WIFSIGNALED(status)) {
- MC_report_crash(status);
- mc_model_checker->exit(SIMGRID_MC_EXIT_PROGRAM_CRASH);
+ MC_report_crash(exploration_, status);
+ this->get_remote_process().terminate();
+ this->exit(SIMGRID_MC_EXIT_PROGRAM_CRASH);
}
}
#endif
XBT_DEBUG("Stopped with signal %i", (int) WSTOPSIG(status));
errno = 0;
#ifdef __linux__
- ptrace(PTRACE_CONT, remote_simulation_->pid(), 0, WSTOPSIG(status));
+ ptrace(PTRACE_CONT, remote_process_->pid(), 0, WSTOPSIG(status));
#elif defined BSD
- ptrace(PT_CONTINUE, remote_simulation_->pid(), (caddr_t)1, WSTOPSIG(status));
+ ptrace(PT_CONTINUE, remote_process_->pid(), (caddr_t)1, WSTOPSIG(status));
#endif
xbt_assert(errno == 0, "Could not PTRACE_CONT");
}
else if (WIFSIGNALED(status)) {
- MC_report_crash(status);
- mc_model_checker->exit(SIMGRID_MC_EXIT_PROGRAM_CRASH);
+ MC_report_crash(exploration_, status);
+ this->get_remote_process().terminate();
+ this->exit(SIMGRID_MC_EXIT_PROGRAM_CRASH);
} else if (WIFEXITED(status)) {
XBT_DEBUG("Child process is over");
- this->get_remote_simulation().terminate();
+ this->get_remote_process().terminate();
}
}
}
void ModelChecker::wait_for_requests()
{
- this->resume(get_remote_simulation());
- if (this->get_remote_simulation().running())
+ this->resume();
+ if (this->get_remote_process().running())
checker_side_.dispatch();
}
-void ModelChecker::handle_simcall(Transition const& transition)
+Transition* ModelChecker::handle_simcall(aid_t aid, int times_considered, bool new_transition)
{
- s_mc_message_simcall_handle_t m;
+ s_mc_message_simcall_execute_t m;
memset(&m, 0, sizeof(m));
- m.type = MessageType::SIMCALL_HANDLE;
- m.pid = transition.pid_;
- m.value = transition.argument_;
+ m.type = MessageType::SIMCALL_EXECUTE;
+ m.aid_ = aid;
+ m.times_considered_ = times_considered;
checker_side_.get_channel().send(m);
- this->remote_simulation_->clear_cache();
- if (this->remote_simulation_->running())
- checker_side_.dispatch();
-}
-bool ModelChecker::checkDeadlock()
-{
- int res = checker_side_.get_channel().send(MessageType::DEADLOCK_CHECK);
- xbt_assert(res == 0, "Could not check deadlock state");
- s_mc_message_int_t message;
- ssize_t s = checker_side_.get_channel().receive(message);
+ this->remote_process_->clear_cache();
+ if (this->remote_process_->running())
+ checker_side_.dispatch(); // The app may send messages while processing the transition
+
+ s_mc_message_simcall_execute_answer_t answer;
+ ssize_t s = checker_side_.get_channel().receive(answer);
xbt_assert(s != -1, "Could not receive message");
- xbt_assert(s == sizeof(message) && message.type == MessageType::DEADLOCK_CHECK_REPLY,
+ xbt_assert(s == sizeof(answer) && answer.type == MessageType::SIMCALL_EXECUTE_ANSWER,
"Received unexpected message %s (%i, size=%i) "
- "expected MessageType::DEADLOCK_CHECK_REPLY (%i, size=%i)",
- to_c_str(message.type), (int)message.type, (int)s, (int)MessageType::DEADLOCK_CHECK_REPLY,
- (int)sizeof(message));
- return message.value != 0;
+ "expected MessageType::SIMCALL_EXECUTE_ANSWER (%i, size=%i)",
+ to_c_str(answer.type), (int)answer.type, (int)s, (int)MessageType::SIMCALL_EXECUTE_ANSWER,
+ (int)sizeof(answer));
+
+ if (new_transition) {
+ std::stringstream stream(answer.buffer.data());
+ return deserialize_transition(aid, times_considered, stream);
+ } else
+ return nullptr;
+}
+
+void ModelChecker::finalize_app(bool terminate_asap)
+{
+ s_mc_message_int_t m;
+ memset(&m, 0, sizeof m);
+ m.type = MessageType::FINALIZE;
+ m.value = terminate_asap;
+ xbt_assert(checker_side_.get_channel().send(m) == 0, "Could not ask the app to finalize on need");
+
+ s_mc_message_t answer;
+ ssize_t s = checker_side_.get_channel().receive(answer);
+ xbt_assert(s != -1, "Could not receive answer to FINALIZE");
+ xbt_assert(s == sizeof(answer) && answer.type == MessageType::FINALIZE_REPLY,
+ "Received unexpected message %s (%i, size=%i) expected MessageType::FINALIZE_REPLY (%i, size=%i)",
+ to_c_str(answer.type), (int)answer.type, (int)s, (int)MessageType::FINALIZE_REPLY, (int)sizeof(answer));
}
-} // namespace mc
-} // namespace simgrid
+} // namespace simgrid::mc