-/* Copyright (c) 2008-2021. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2008-2022. 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/mc_config.hpp"
#include "src/mc/mc_exit.hpp"
#include "src/mc/mc_private.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>
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_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");
-
- remote_process_->init();
+ xbt_assert(waitpid(pid, &status, WAITPID_CHECKED_FLAGS) == pid && WIFSTOPPED(status) && WSTOPSIG(status) == SIGSTOP,
+ "Could not wait model-checked process");
if (not _sg_mc_dot_output_file.get().empty())
MC_init_dot_output();
{
XBT_DEBUG("Shutting down model-checker");
- RemoteProcess* process = &this->get_remote_process();
- 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();
}
}
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();
+ XBT_INFO("Path = %s", mc_model_checker->getChecker()->get_record_trace().to_string().c_str());
+ session_singleton->log_state();
if (xbt_log_no_loc) {
XBT_INFO("Stack trace not displayed because you passed --log=no_loc");
} else {
}
}
-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, message.actors, message.dead_actors);
+ break;
+ }
+
case MessageType::IGNORE_HEAP: {
s_mc_message_ignore_heap_t message;
xbt_assert(size == sizeof(message), "Broken message");
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 : getChecker()->get_textual_trace())
+ XBT_INFO(" %s", s.c_str());
+ XBT_INFO("Path = %s", getChecker()->get_record_trace().to_string().c_str());
+ session_singleton->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_process().running())
- kill(get_remote_process().pid(), SIGKILL);
+ shutdown();
::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);
- exit(SIMGRID_MC_EXIT_PROGRAM_CRASH);
+ this->get_remote_process().terminate();
+ this->exit(SIMGRID_MC_EXIT_PROGRAM_CRASH);
}
}
#endif
else if (WIFSIGNALED(status)) {
MC_report_crash(status);
- mc_model_checker->exit(SIMGRID_MC_EXIT_PROGRAM_CRASH);
+ 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_process().terminate();
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.times_considered_ = transition.times_considered_;
+ m.type = MessageType::SIMCALL_EXECUTE;
+ m.aid_ = aid;
+ m.times_considered_ = times_considered;
checker_side_.get_channel().send(m);
+
this->remote_process_->clear_cache();
if (this->remote_process_->running())
- checker_side_.dispatch();
+ 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(answer) && answer.type == MessageType::SIMCALL_EXECUTE_ANSWER,
+ "Received unexpected message %s (%i, size=%i) "
+ "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;
}
-bool ModelChecker::simcall_is_visible(int aid)
+bool ModelChecker::simcall_is_visible(aid_t aid)
{
xbt_assert(mc_model_checker != nullptr, "This should be called from the checker side");
to_c_str(answer.type), (int)answer.type, (int)s, (int)MessageType::SIMCALL_IS_VISIBLE_ANSWER,
(int)sizeof(answer));
- XBT_DEBUG("is_visible(%d) is returning %s", aid, answer.value ? "true" : "false");
+ XBT_DEBUG("is_visible(%ld) is returning %s", aid, answer.value ? "true" : "false");
this->remote_process_->clear_cache();
return answer.value;
}
-std::string ModelChecker::simcall_to_string(MessageType type, int aid, int times_considered)
-{
- xbt_assert(mc_model_checker != nullptr, "This should be called from the checker side");
-
- s_mc_message_simcall_to_string_t m;
- memset(&m, 0, sizeof(m));
- m.type = type;
- m.aid = aid;
- m.time_considered = times_considered;
- checker_side_.get_channel().send(m);
-
- s_mc_message_simcall_to_string_answer_t answer;
- ssize_t s = checker_side_.get_channel().receive(answer);
- xbt_assert(s != -1, "Could not receive message");
- xbt_assert(s == sizeof(answer) && answer.type == MessageType::SIMCALL_TO_STRING_ANSWER,
- "Received unexpected message %s (%i, size=%i) "
- "expected MessageType::SIMCALL_TO_STRING_ANSWER (%i, size=%i)",
- to_c_str(answer.type), (int)answer.type, (int)s, (int)MessageType::SIMCALL_TO_STRING_ANSWER,
- (int)sizeof(answer));
-
- return std::string(answer.value);
-}
-
-std::string ModelChecker::simcall_to_string(int aid, int times_considered)
-{
- std::string answer = simcall_to_string(MessageType::SIMCALL_TO_STRING, aid, times_considered);
- XBT_DEBUG("to_string(%d) is returning %s", aid, answer.c_str());
- return answer;
-}
-
-std::string ModelChecker::simcall_dot_label(int aid, int times_considered)
+void ModelChecker::finalize_app(bool terminate_asap)
{
- std::string answer = simcall_to_string(MessageType::SIMCALL_DOT_LABEL, aid, times_considered);
- XBT_DEBUG("dot_label(%d) is returning %s", aid, answer.c_str());
- return answer;
+ 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;
+ xbt_assert(checker_side_.get_channel().receive(answer) != -1, "Could not receive answer to FINALIZE");
}
bool ModelChecker::checkDeadlock()
{
- int res = checker_side_.get_channel().send(MessageType::DEADLOCK_CHECK);
- xbt_assert(res == 0, "Could not check deadlock state");
+ xbt_assert(checker_side_.get_channel().send(MessageType::DEADLOCK_CHECK) == 0, "Could not check deadlock state");
s_mc_message_int_t message;
ssize_t s = checker_side_.get_channel().receive(message);
xbt_assert(s != -1, "Could not receive message");
