X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/d11214844321704ca61b48b9443d7f3e53a966f6..a78e55a602586cf557968132c2d8c30af758af25:/src/mc/api/RemoteApp.cpp diff --git a/src/mc/api/RemoteApp.cpp b/src/mc/api/RemoteApp.cpp index ad68366e9a..df0c81fb58 100644 --- a/src/mc/api/RemoteApp.cpp +++ b/src/mc/api/RemoteApp.cpp @@ -4,21 +4,16 @@ * under the terms of the license (GNU LGPL) which comes with this package. */ #include "src/mc/api/RemoteApp.hpp" -#include "src/internal_config.h" // HAVE_SMPI #include "src/mc/explo/Exploration.hpp" #include "src/mc/mc_config.hpp" #include "xbt/asserts.h" -#if HAVE_SMPI -#include "smpi/smpi.h" -#include "src/smpi/include/private.hpp" -#endif -#include "signal.h" #include "src/mc/api/State.hpp" #include "src/mc/mc_config.hpp" #include "src/mc/mc_exit.hpp" #include "src/mc/mc_private.hpp" #include "xbt/log.h" #include "xbt/system_error.hpp" +#include #include #include @@ -31,6 +26,14 @@ #ifdef __linux__ #include #endif +#include +#include + +#ifdef __linux__ +#define WAITPID_CHECKED_FLAGS __WALL +#else +#define WAITPID_CHECKED_FLAGS 0 +#endif XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_Session, mc, "Model-checker session"); XBT_LOG_EXTERNAL_CATEGORY(mc_global); @@ -102,12 +105,6 @@ XBT_ATTRIB_NORETURN static void run_child_process(int socket, const std::vector< RemoteApp::RemoteApp(const std::vector& args) { -#if HAVE_SMPI - smpi_init_options(); // only performed once - xbt_assert(smpi_cfg_privatization() != SmpiPrivStrategies::MMAP, - "Please use the dlopen privatization schema when model-checking SMPI code"); -#endif - // Create an AF_LOCAL socketpair used for exchanging messages // between the model-checker process (ourselves) and the model-checked // process: @@ -126,37 +123,66 @@ RemoteApp::RemoteApp(const std::vector& args) // Parent (model-checker): ::close(sockets[0]); - xbt_assert(mc_model_checker == nullptr, "Did you manage to start the MC twice in this process?"); - - auto process = std::make_unique(pid); - model_checker_ = std::make_unique(std::move(process), sockets[1]); + checker_side_ = std::make_unique(sockets[1], pid); - mc_model_checker = model_checker_.get(); - model_checker_->start(); + start(); /* Take the initial snapshot */ - model_checker_->wait_for_requests(); - initial_snapshot_ = std::make_shared(0); + wait_for_requests(); + initial_snapshot_ = std::make_shared(0, page_store_, checker_side_->get_remote_memory()); } RemoteApp::~RemoteApp() { initial_snapshot_ = nullptr; - if (model_checker_) { - model_checker_->shutdown(); - model_checker_ = nullptr; - mc_model_checker = nullptr; - } + shutdown(); } +void RemoteApp::start() +{ + 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 = checker_side_->get_pid(); + + xbt_assert(waitpid(pid, &status, WAITPID_CHECKED_FLAGS) == pid && WIFSTOPPED(status) && WSTOPSIG(status) == SIGSTOP, + "Could not wait model-checked process"); + + errno = 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 + 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 RemoteApp::restore_initial_state() const { - this->initial_snapshot_->restore(&model_checker_->get_remote_process()); + this->initial_snapshot_->restore(checker_side_->get_remote_memory()); } unsigned long RemoteApp::get_maxpid() const { - return model_checker_->get_remote_process().get_maxpid(); + // note: we could maybe cache it and count the actor creation on checker side too. + // But counting correctly accross state checkpoint/restore would be annoying. + + checker_side_->get_channel().send(MessageType::ACTORS_MAXPID); + s_mc_message_int_t answer; + ssize_t answer_size = checker_side_->get_channel().receive(answer); + xbt_assert(answer_size != -1, "Could not receive message"); + xbt_assert(answer_size == sizeof answer, "Broken message (size=%zd; expected %zu)", answer_size, sizeof answer); + xbt_assert(answer.type == MessageType::ACTORS_MAXPID_REPLY, + "Received unexpected message %s (%i); expected MessageType::ACTORS_MAXPID_REPLY (%i)", + to_c_str(answer.type), (int)answer.type, (int)MessageType::ACTORS_MAXPID_REPLY); + + return answer.value; } void RemoteApp::get_actors_status(std::map& whereto) const @@ -168,16 +194,15 @@ void RemoteApp::get_actors_status(std::map& whereto) const // <----- send ACTORS_STATUS_REPLY // <----- send `N` `s_mc_message_actors_status_one_t` structs // <----- send `M` `s_mc_message_simcall_probe_one_t` structs - model_checker_->channel().send(MessageType::ACTORS_STATUS); + checker_side_->get_channel().send(MessageType::ACTORS_STATUS); s_mc_message_actors_status_answer_t answer; - ssize_t received = model_checker_->channel().receive(answer); - xbt_assert(received != -1, "Could not receive message"); - xbt_assert(received == sizeof(answer) && answer.type == MessageType::ACTORS_STATUS_REPLY, - "Received unexpected message %s (%i, size=%i) " - "expected MessageType::ACTORS_STATUS_REPLY (%i, size=%i)", - to_c_str(answer.type), (int)answer.type, (int)received, (int)MessageType::ACTORS_STATUS_REPLY, - (int)sizeof(answer)); + ssize_t answer_size = checker_side_->get_channel().receive(answer); + xbt_assert(answer_size != -1, "Could not receive message"); + xbt_assert(answer_size == sizeof answer, "Broken message (size=%zd; expected %zu)", answer_size, sizeof answer); + xbt_assert(answer.type == MessageType::ACTORS_STATUS_REPLY, + "Received unexpected message %s (%i); expected MessageType::ACTORS_STATUS_REPLY (%i)", + to_c_str(answer.type), (int)answer.type, (int)MessageType::ACTORS_STATUS_REPLY); // Message sanity checks xbt_assert(answer.count >= 0, "Received an ACTOR_STATUS_REPLY message with an actor count of '%d' < 0", answer.count); @@ -190,7 +215,7 @@ void RemoteApp::get_actors_status(std::map& whereto) const std::vector status(answer.count); if (answer.count > 0) { size_t size = status.size() * sizeof(s_mc_message_actors_status_one_t); - ssize_t received = model_checker_->channel().receive(status.data(), size); + ssize_t received = checker_side_->get_channel().receive(status.data(), size); xbt_assert(static_cast(received) == size); } @@ -206,17 +231,16 @@ void RemoteApp::get_actors_status(std::map& whereto) const std::vector probes(answer.transition_count); if (answer.transition_count > 0) { for (auto& probe : probes) { - size_t size = sizeof(s_mc_message_simcall_probe_one_t); - ssize_t received = model_checker_->channel().receive(&probe, size); + ssize_t received = checker_side_->get_channel().receive(probe); xbt_assert(received >= 0, "Could not receive response to ACTORS_PROBE message (%s)", strerror(errno)); - xbt_assert(static_cast(received) == size, + xbt_assert(static_cast(received) == sizeof probe, "Could not receive response to ACTORS_PROBE message (%zd bytes received != %zu bytes expected", - received, size); + received, sizeof probe); } } whereto.clear(); - auto probes_iter = std::move_iterator(probes.begin()); + std::move_iterator probes_iter(probes.begin()); for (const auto& actor : status) { xbt_assert(actor.n_transitions == 0 || actor.n_transitions == actor.max_considered, @@ -225,39 +249,105 @@ void RemoteApp::get_actors_status(std::map& whereto) const "(currently %d), but only %d transition(s) was/were said to be encoded", actor.max_considered, actor.n_transitions); - auto actor_transitions = std::vector>(actor.n_transitions); + std::vector> actor_transitions; for (int times_considered = 0; times_considered < actor.n_transitions; times_considered++, probes_iter++) { std::stringstream stream((*probes_iter).buffer.data()); - auto transition = std::unique_ptr(deserialize_transition(actor.aid, times_considered, stream)); - actor_transitions[times_considered] = std::move(transition); + actor_transitions.emplace_back(deserialize_transition(actor.aid, times_considered, stream)); } - XBT_DEBUG("Received %d transitions for actor %ld", actor.n_transitions, actor.aid); + XBT_DEBUG("Received %zu transitions for actor %ld", actor_transitions.size(), actor.aid); whereto.try_emplace(actor.aid, actor.aid, actor.enabled, actor.max_considered, std::move(actor_transitions)); } } void RemoteApp::check_deadlock() const { - xbt_assert(model_checker_->channel().send(MessageType::DEADLOCK_CHECK) == 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 = model_checker_->channel().receive(message); - xbt_assert(s != -1, "Could not receive message"); - xbt_assert(s == sizeof(message) && message.type == MessageType::DEADLOCK_CHECK_REPLY, - "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)); + ssize_t received = checker_side_->get_channel().receive(message); + xbt_assert(received != -1, "Could not receive message"); + xbt_assert(received == sizeof message, "Broken message (size=%zd; expected %zu)", received, sizeof message); + xbt_assert(message.type == MessageType::DEADLOCK_CHECK_REPLY, + "Received unexpected message %s (%i); expected MessageType::DEADLOCK_CHECK_REPLY (%i)", + to_c_str(message.type), (int)message.type, (int)MessageType::DEADLOCK_CHECK_REPLY); if (message.value != 0) { + auto* explo = Exploration::get_instance(); XBT_CINFO(mc_global, "Counter-example execution trace:"); - for (auto const& frame : model_checker_->get_exploration()->get_textual_trace()) + for (auto const& frame : explo->get_textual_trace()) XBT_CINFO(mc_global, " %s", frame.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'", - model_checker_->get_exploration()->get_record_trace().to_string().c_str()); - model_checker_->get_exploration()->log_state(); + explo->get_record_trace().to_string().c_str()); + explo->log_state(); throw DeadlockError(); } } + +void RemoteApp::wait_for_requests() +{ + /* Resume the application */ + if (checker_side_->get_channel().send(MessageType::CONTINUE) != 0) + throw xbt::errno_error(); + get_remote_process_memory().clear_cache(); + + if (checker_side_->running()) + checker_side_->dispatch_events(); +} + +void RemoteApp::shutdown() +{ + XBT_DEBUG("Shutting down model-checker"); + + if (checker_side_->running()) { + XBT_DEBUG("Killing process"); + finalize_app(true); + kill(checker_side_->get_pid(), SIGKILL); + checker_side_->terminate(); + } +} + +Transition* RemoteApp::handle_simcall(aid_t aid, int times_considered, bool new_transition) +{ + s_mc_message_simcall_execute_t m = {}; + m.type = MessageType::SIMCALL_EXECUTE; + m.aid_ = aid; + m.times_considered_ = times_considered; + checker_side_->get_channel().send(m); + + get_remote_process_memory().clear_cache(); + if (checker_side_->running()) + checker_side_->dispatch_events(); // 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, "Broken message (size=%zd; expected %zu)", s, sizeof answer); + xbt_assert(answer.type == MessageType::SIMCALL_EXECUTE_ANSWER, + "Received unexpected message %s (%i); expected MessageType::SIMCALL_EXECUTE_ANSWER (%i)", + to_c_str(answer.type), (int)answer.type, (int)MessageType::SIMCALL_EXECUTE_ANSWER); + + if (new_transition) { + std::stringstream stream(answer.buffer.data()); + return deserialize_transition(aid, times_considered, stream); + } else + return nullptr; +} + +void RemoteApp::finalize_app(bool terminate_asap) +{ + s_mc_message_int_t 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, "Broken message (size=%zd; expected %zu)", s, sizeof answer); + xbt_assert(answer.type == MessageType::FINALIZE_REPLY, + "Received unexpected message %s (%i); expected MessageType::FINALIZE_REPLY (%i)", to_c_str(answer.type), + (int)answer.type, (int)MessageType::FINALIZE_REPLY); +} + } // namespace simgrid::mc