X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/4a6b0a991a67e6f2f67c03fed43529e078da7115..22cae46149e1fb4988ad9e46060c3e7ecd4e0e44:/src/mc/ModelChecker.cpp diff --git a/src/mc/ModelChecker.cpp b/src/mc/ModelChecker.cpp index 4411458d65..1a4f7028ff 100644 --- a/src/mc/ModelChecker.cpp +++ b/src/mc/ModelChecker.cpp @@ -6,134 +6,109 @@ #include -#include #include #include #include -#include #include #include #include -#include +#include "xbt/log.h" #include #include +#include #include "simgrid/sg_config.h" #include "src/mc/ModelChecker.hpp" -#include "src/mc/PageStore.hpp" #include "src/mc/ModelChecker.hpp" -#include "src/mc/mc_protocol.h" -#include "src/mc/mc_private.h" -#include "src/mc/mc_ignore.h" +#include "src/mc/PageStore.hpp" +#include "src/mc/Transition.hpp" +#include "src/mc/checker/Checker.hpp" #include "src/mc/mc_exit.h" -#include "src/mc/mc_liveness.h" - -extern "C" { +#include "src/mc/mc_private.h" +#include "src/mc/mc_record.h" +#include "src/mc/remote/mc_protocol.h" XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_ModelChecker, mc, "ModelChecker"); -} - ::simgrid::mc::ModelChecker* mc_model_checker = nullptr; using simgrid::mc::remote; -// Hardcoded index for now: -#define SOCKET_FD_INDEX 0 -#define SIGNAL_FD_INDEX 1 +#ifdef __linux__ +# define WAITPID_CHECKED_FLAGS __WALL +#else +# define WAITPID_CHECKED_FLAGS 0 +#endif namespace simgrid { namespace mc { -ModelChecker::ModelChecker(pid_t pid, int socket) : - pid_(pid), socket_(socket), - hostnames_(xbt_dict_new()), +ModelChecker::ModelChecker(std::unique_ptr process) : + base_(nullptr), + socket_event_(nullptr), + signal_event_(nullptr), page_store_(500), + process_(std::move(process)), parent_snapshot_(nullptr) { } -ModelChecker::~ModelChecker() -{ - xbt_dict_free(&this->hostnames_); -} - -const char* ModelChecker::get_host_name(const char* hostname) -{ - // Lookup the host name in the dictionary (or create it): - xbt_dictelm_t elt = xbt_dict_get_elm_or_null(this->hostnames_, hostname); - if (!elt) { - xbt_dict_set(this->hostnames_, hostname, nullptr, nullptr); - elt = xbt_dict_get_elm_or_null(this->hostnames_, hostname); - assert(elt); - } - return elt->key; -} - -// HACK, for the unit test only -void ModelChecker::init_process() -{ - // TODO, avoid direct dependency on sg_cfg - process_ = std::unique_ptr(new Process(pid_, socket_)); - process_->privatized(sg_cfg_get_boolean("smpi/privatize_global_variables")); +ModelChecker::~ModelChecker() { + if (socket_event_ != nullptr) + event_free(socket_event_); + if (signal_event_ != nullptr) + event_free(signal_event_); + if (base_ != nullptr) + event_base_free(base_); } void ModelChecker::start() { - // Block SIGCHLD (this will be handled with accept/signalfd): - sigset_t set; - sigemptyset(&set); - sigaddset(&set, SIGCHLD); - if (sigprocmask(SIG_BLOCK, &set, nullptr) == -1) - throw std::system_error(errno, std::system_category()); - - sigset_t full_set; - sigfillset(&full_set); - - // Prepare data for poll: - - struct pollfd* socket_pollfd = &fds_[SOCKET_FD_INDEX]; - socket_pollfd->fd = socket_; - socket_pollfd->events = POLLIN; - socket_pollfd->revents = 0; - - int signal_fd = signalfd(-1, &set, 0); - if (signal_fd == -1) - throw std::system_error(errno, std::system_category()); - - struct pollfd* signalfd_pollfd = &fds_[SIGNAL_FD_INDEX]; - signalfd_pollfd->fd = signal_fd; - signalfd_pollfd->events = POLLIN; - signalfd_pollfd->revents = 0; + const pid_t pid = process_->pid(); + + base_ = event_base_new(); + event_callback_fn event_callback = [](evutil_socket_t fd, short events, void *arg) + { + ((ModelChecker *)arg)->handle_events(fd, events); + }; + socket_event_ = event_new(base_, + process_->getChannel().getSocket(), + EV_READ|EV_PERSIST, + event_callback, this); + event_add(socket_event_, NULL); + signal_event_ = event_new(base_, + SIGCHLD, + EV_SIGNAL|EV_PERSIST, + event_callback, this); + event_add(signal_event_, NULL); XBT_DEBUG("Waiting for the model-checked process"); int status; // The model-checked process SIGSTOP itself to signal it's ready: - pid_t res = waitpid(pid_, &status, __WALL); - if (res < 0 || !WIFSTOPPED(status) || WSTOPSIG(status) != SIGSTOP) + 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"); - this->init_process(); - - /* Initialize statistics */ - mc_stats = xbt_new0(s_mc_stats_t, 1); - mc_stats->state_size = 1; + process_->init(); if ((_sg_mc_dot_output_file != nullptr) && (_sg_mc_dot_output_file[0] != '\0')) MC_init_dot_output(); - /* Init parmap */ - //parmap = xbt_parmap_mc_new(xbt_os_get_numcores(), XBT_PARMAP_DEFAULT); - setup_ignore(); - ptrace(PTRACE_SETOPTIONS, pid_, nullptr, PTRACE_O_TRACEEXIT); - ptrace(PTRACE_CONT, pid_, 0, 0); +#ifdef __linux__ + ptrace(PTRACE_SETOPTIONS, pid, nullptr, PTRACE_O_TRACEEXIT); + ptrace(PTRACE_CONT, pid, 0, 0); +#elif defined BSD + ptrace(PT_CONTINUE, pid, (caddr_t)1, 0); +#else +# error "no ptrace equivalent coded for this platform" +#endif } static const std::pair ignored_local_variables[] = { @@ -163,9 +138,6 @@ void ModelChecker::setup_ignore() /* Static variable used for tracing */ process.ignore_global_variable("counter"); - - /* SIMIX */ - process.ignore_global_variable("smx_total_comms"); } void ModelChecker::shutdown() @@ -182,20 +154,44 @@ void ModelChecker::shutdown() void ModelChecker::resume(simgrid::mc::Process& process) { - int res = process.send_message(MC_MESSAGE_CONTINUE); + int res = process.getChannel().send(MC_MESSAGE_CONTINUE); if (res) - throw std::system_error(res, std::system_category()); - process.cache_flags = (mc_process_cache_flags_t) 0; + throw simgrid::xbt::errno_error(); + process.clear_cache(); } -static -void throw_socket_error(int fd) +static void MC_report_crash(int status) { - int error = 0; - socklen_t errlen = sizeof(error); - if (getsockopt(fd, SOL_SOCKET, SO_ERROR, (void *)&error, &errlen) == -1) - error = errno; - throw std::system_error(error, std::system_category()); + XBT_INFO("**************************"); + XBT_INFO("** CRASH IN THE PROGRAM **"); + XBT_INFO("**************************"); + if (WIFSIGNALED(status)) + XBT_INFO("From signal: %s", strsignal(WTERMSIG(status))); + else if (WIFEXITED(status)) + XBT_INFO("From exit: %i", WEXITSTATUS(status)); + if (WCOREDUMP(status)) + XBT_INFO("A core dump was generated by the system."); + else + XBT_INFO("No core dump was generated by the system."); + XBT_INFO("Counter-example execution trace:"); + simgrid::mc::dumpRecordPath(); + for (auto& s : mc_model_checker->getChecker()->getTextualTrace()) + XBT_INFO("%s", s.c_str()); + simgrid::mc::session->logState(); + XBT_INFO("Stack trace:"); + mc_model_checker->process().dumpStack(); +} + +static void MC_report_assertion_error() +{ + XBT_INFO("**************************"); + XBT_INFO("*** PROPERTY NOT VALID ***"); + XBT_INFO("**************************"); + XBT_INFO("Counter-example execution trace:"); + simgrid::mc::dumpRecordPath(); + for (auto& s : mc_model_checker->getChecker()->getTextualTrace()) + XBT_INFO("%s", s.c_str()); + simgrid::mc::session->logState(); } bool ModelChecker::handle_message(char* buffer, ssize_t size) @@ -264,13 +260,13 @@ bool ModelChecker::handle_message(char* buffer, ssize_t size) xbt_die("Support for client-side function proposition is not implemented."); XBT_DEBUG("Received symbol: %s", message.name); - if (_mc_property_automaton == nullptr) - _mc_property_automaton = xbt_automaton_new(); + if (simgrid::mc::property_automaton == nullptr) + simgrid::mc::property_automaton = xbt_automaton_new(); simgrid::mc::Process* process = &this->process(); - simgrid::mc::remote_ptr address + simgrid::mc::RemotePtr address = simgrid::mc::remote((int*) message.data); - simgrid::xbt::add_proposition(_mc_property_automaton, + simgrid::xbt::add_proposition(simgrid::mc::property_automaton, message.name, [process, address]() { return process->read(address); } ); @@ -283,7 +279,7 @@ bool ModelChecker::handle_message(char* buffer, ssize_t size) case MC_MESSAGE_ASSERTION_FAILED: MC_report_assertion_error(); - ::exit(SIMGRID_MC_EXIT_SAFETY); + this->exit(SIMGRID_MC_EXIT_SAFETY); break; default: @@ -293,74 +289,38 @@ bool ModelChecker::handle_message(char* buffer, ssize_t size) return true; } -bool ModelChecker::handle_events() +/** Terminate the model-checker application */ +void ModelChecker::exit(int status) { - char buffer[MC_MESSAGE_LENGTH]; - struct pollfd* socket_pollfd = &fds_[SOCKET_FD_INDEX]; - struct pollfd* signalfd_pollfd = &fds_[SIGNAL_FD_INDEX]; - - while(poll(fds_, 2, -1) == -1) { - switch(errno) { - case EINTR: - continue; - default: - throw std::system_error(errno, std::system_category()); - } - } + // TODO, terminate the model checker politely instead of exiting rudely + if (process().running()) + kill(process().pid(), SIGKILL); + ::exit(status); +} - if (socket_pollfd->revents) { - if (socket_pollfd->revents & POLLIN) { - ssize_t size = MC_receive_message(socket_pollfd->fd, buffer, sizeof(buffer), MSG_DONTWAIT); - if (size == -1 && errno != EAGAIN) - throw std::system_error(errno, std::system_category()); - return handle_message(buffer, size); - } - if (socket_pollfd->revents & POLLERR) { - throw_socket_error(socket_pollfd->fd); +void ModelChecker::handle_events(int fd, short events) +{ + if (events == EV_READ) { + char buffer[MC_MESSAGE_LENGTH]; + ssize_t size = process_->getChannel().receive(buffer, sizeof(buffer), false); + if (size == -1 && errno != EAGAIN) + throw simgrid::xbt::errno_error(); + if (not handle_message(buffer, size)) { + event_base_loopbreak(base_); } - if (socket_pollfd->revents & POLLHUP) - xbt_die("Socket hang up?"); } - - if (signalfd_pollfd->revents) { - if (signalfd_pollfd->revents & POLLIN) { - this->handle_signals(); - return true; - } - if (signalfd_pollfd->revents & POLLERR) { - throw_socket_error(signalfd_pollfd->fd); - } - if (signalfd_pollfd->revents & POLLHUP) - xbt_die("Signalfd hang up?"); + else if (events == EV_SIGNAL) { + on_signal(fd); + } + else { + xbt_die("Unexpected event"); } - - return true; } void ModelChecker::loop() { - while (this->process().running()) - this->handle_events(); -} - -void ModelChecker::handle_signals() -{ - struct signalfd_siginfo info; - struct pollfd* signalfd_pollfd = &fds_[SIGNAL_FD_INDEX]; - while (1) { - ssize_t size = read(signalfd_pollfd->fd, &info, sizeof(info)); - if (size == -1) { - if (errno == EINTR) - continue; - else - throw std::system_error(errno, std::system_category()); - } else if (size != sizeof(info)) - return throw std::runtime_error( - "Bad communication with model-checked application"); - else - break; - } - this->on_signal(&info); + if (this->process().running()) + event_base_dispatch(base_); } void ModelChecker::handle_waitpid() @@ -378,26 +338,34 @@ void ModelChecker::handle_waitpid() break; } else { XBT_ERROR("Could not wait for pid"); - throw std::system_error(errno, std::system_category()); + throw simgrid::xbt::errno_error(); } } if (pid == this->process().pid()) { // From PTRACE_O_TRACEEXIT: +#ifdef __linux__ if (status>>8 == (SIGTRAP | (PTRACE_EVENT_EXIT<<8))) { - if (ptrace(PTRACE_GETEVENTMSG, pid_, 0, &status) == -1) + if (ptrace(PTRACE_GETEVENTMSG, this->process().pid(), 0, &status) == -1) xbt_die("Could not get exit status"); if (WIFSIGNALED(status)) { MC_report_crash(status); - ::exit(SIMGRID_MC_EXIT_PROGRAM_CRASH); + mc_model_checker->exit(SIMGRID_MC_EXIT_PROGRAM_CRASH); } } +#endif // We don't care about signals, just reinject them: if (WIFSTOPPED(status)) { XBT_DEBUG("Stopped with signal %i", (int) WSTOPSIG(status)); - if (ptrace(PTRACE_CONT, pid_, 0, WSTOPSIG(status)) == -1) + errno = 0; +#ifdef __linux__ + ptrace(PTRACE_CONT, this->process().pid(), 0, WSTOPSIG(status)); +#elif defined BSD + ptrace(PT_CONTINUE, this->process().pid(), (caddr_t)1, WSTOPSIG(status)); +#endif + if (errno != 0) xbt_die("Could not PTRACE_CONT"); } @@ -409,9 +377,9 @@ void ModelChecker::handle_waitpid() } } -void ModelChecker::on_signal(const struct signalfd_siginfo* info) +void ModelChecker::on_signal(int signo) { - switch(info->ssi_signo) { + switch(signo) { case SIGCHLD: this->handle_waitpid(); break; @@ -423,25 +391,39 @@ void ModelChecker::on_signal(const struct signalfd_siginfo* info) void ModelChecker::wait_client(simgrid::mc::Process& process) { this->resume(process); - while (this->process().running()) { - if (!this->handle_events()) - return; - } + if (this->process().running()) + event_base_dispatch(base_); } -void ModelChecker::simcall_handle(simgrid::mc::Process& process, unsigned long pid, int value) +void ModelChecker::handle_simcall(Transition const& transition) { s_mc_simcall_handle_message m; memset(&m, 0, sizeof(m)); m.type = MC_MESSAGE_SIMCALL_HANDLE; - m.pid = pid; - m.value = value; - process.send_message(m); - process.cache_flags = (mc_process_cache_flags_t) 0; - while (process.running()) { - if (!this->handle_events()) - return; - } + m.pid = transition.pid; + m.value = transition.argument; + this->process_->getChannel().send(m); + this->process_->clear_cache(); + if (this->process_->running()) + event_base_dispatch(base_); +} + +bool ModelChecker::checkDeadlock() +{ + int res; + if ((res = this->process().getChannel().send(MC_MESSAGE_DEADLOCK_CHECK))) + xbt_die("Could not check deadlock state"); + s_mc_int_message_t message; + ssize_t s = mc_model_checker->process().getChannel().receive(message); + if (s == -1) + xbt_die("Could not receive message"); + if (s != sizeof(message) || message.type != MC_MESSAGE_DEADLOCK_CHECK_REPLY) + xbt_die("Received unexpected message %s (%i, size=%i) " + "expected MC_MESSAGE_DEADLOCK_CHECK_REPLY (%i, size=%i)", + MC_message_type_name(message.type), (int) message.type, (int) s, + (int) MC_MESSAGE_DEADLOCK_CHECK_REPLY, (int) sizeof(message) + ); + return message.value != 0; } }