Fix race between the queue monitor and the builder threads
This commit is contained in:
Eelco Dolstra
parent
9c03b11ca8
commit
948473c909
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@ -120,9 +120,7 @@ struct Build
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std::shared_ptr<Step> toplevel;
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bool finishedInDB;
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Build() : finishedInDB(false) { }
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std::atomic_bool finishedInDB{false};
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~Build()
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{
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@ -158,13 +156,15 @@ struct Step
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system_time after;
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};
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std::atomic_bool created{false}; // debugging
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std::atomic_bool finished{false}; // debugging
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Sync<State> state;
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std::atomic_bool destroyed;
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Step() : destroyed(false) { }
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~Step() { }
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~Step()
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{
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printMsg(lvlError, format("destroying step %1%") % drvPath);
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}
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};
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@ -280,13 +280,9 @@ public:
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void removeCancelledBuilds(Connection & conn);
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Step::ptr createStep(std::shared_ptr<StoreAPI> store, const Path & drvPath,
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Build::ptr referringBuild, Step::ptr referringStep,
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std::set<Step::ptr> & newSteps, std::set<Step::ptr> & newRunnable);
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void destroyStep(Step::ptr step, bool proceed);
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/* Get the builds that depend on the given step. */
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std::set<Build::ptr> getDependentBuilds(Step::ptr step);
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void makeRunnable(Step::ptr step);
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/* The thread that selects and starts runnable builds. */
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@ -525,6 +521,7 @@ void State::getQueuedBuilds(Connection & conn, std::shared_ptr<StoreAPI> store,
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/* Derivation has been GC'ed prematurely. */
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printMsg(lvlError, format("aborting GC'ed build %1%") % build->id);
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pqxx::work txn(conn);
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assert(!build->finishedInDB);
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txn.parameterized
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("update Builds set finished = 1, busy = 0, buildStatus = $2, startTime = $3, stopTime = $3, errorMsg = $4 where id = $1")
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(build->id)
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@ -538,7 +535,7 @@ void State::getQueuedBuilds(Connection & conn, std::shared_ptr<StoreAPI> store,
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}
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std::set<Step::ptr> newSteps;
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Step::ptr step = createStep(store, build->drvPath, newSteps, newRunnable);
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Step::ptr step = createStep(store, build->drvPath, build, 0, newSteps, newRunnable);
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/* Some of the new steps may be the top level of builds that
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we haven't processed yet. So do them now. This ensures that
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@ -560,13 +557,13 @@ void State::getQueuedBuilds(Connection & conn, std::shared_ptr<StoreAPI> store,
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Derivation drv = readDerivation(build->drvPath);
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BuildResult res = getBuildResult(store, drv);
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printMsg(lvlInfo, format("marking build %1% as cached successful") % build->id);
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pqxx::work txn(conn);
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time_t now = time(0);
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markSucceededBuild(txn, build, res, true, now, now);
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txn.commit();
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build->finishedInDB = true;
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return;
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}
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@ -603,6 +600,7 @@ void State::getQueuedBuilds(Connection & conn, std::shared_ptr<StoreAPI> store,
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time_t now = time(0);
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pqxx::work txn(conn);
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createBuildStep(txn, 0, build, r, "", buildStepStatus);
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assert(!build->finishedInDB);
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txn.parameterized
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("update Builds set finished = 1, busy = 0, buildStatus = $2, startTime = $3, stopTime = $3, isCachedBuild = $4 where id = $1")
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(build->id)
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@ -624,20 +622,12 @@ void State::getQueuedBuilds(Connection & conn, std::shared_ptr<StoreAPI> store,
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{
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auto builds_(builds.lock());
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auto step_(step->state.lock());
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(*builds_)[build->id] = build;
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step_->builds.push_back(build);
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build->toplevel = step;
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}
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printMsg(lvlChatty, format("added build %1% (top-level step %2%, %3% new steps)")
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% build->id % step->drvPath % newSteps.size());
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/* Prior to this, the build is not visible to
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getDependentBuilds(). Now it is, so the build can be
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failed if a dependency fails. (It can't succeed right away
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because its top-level is not runnable yet). */
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};
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/* Now instantiate build steps for each new build. The builder
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@ -687,32 +677,65 @@ void State::removeCancelledBuilds(Connection & conn)
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Step::ptr State::createStep(std::shared_ptr<StoreAPI> store, const Path & drvPath,
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Build::ptr referringBuild, Step::ptr referringStep,
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std::set<Step::ptr> & newSteps, std::set<Step::ptr> & newRunnable)
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{
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/* Check if the requested step already exists. */
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/* Check if the requested step already exists. If not, create a
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new step. In any case, make the step reachable from
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referringBuild or referringStep. This is done atomically (with
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‘steps’ locked), to ensure that this step can never become
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reachable from a new build after doBuildStep has removed it
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from ‘steps’. */
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Step::ptr step;
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bool isNew = false;
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{
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auto steps_(steps.lock());
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/* See if the step already exists in ‘steps’ and is not
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stale. */
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auto prev = steps_->find(drvPath);
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if (prev != steps_->end()) {
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auto step = prev->second.lock();
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step = prev->second.lock();
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/* Since ‘step’ is a strong pointer, the referred Step
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object won't be deleted after this. */
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if (step) return step;
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steps_->erase(drvPath); // remove stale entry
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if (!step) steps_->erase(drvPath); // remove stale entry
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}
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/* If it doesn't exist, create it. */
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if (!step) {
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step = std::make_shared<Step>();
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step->drvPath = drvPath;
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isNew = true;
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}
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auto step_(step->state.lock());
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if (referringBuild)
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step_->builds.push_back(referringBuild);
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if (referringStep)
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step_->rdeps.push_back(referringStep);
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(*steps_)[drvPath] = step;
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}
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printMsg(lvlDebug, format("considering derivation ‘%1%’") % drvPath);
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auto step = std::make_shared<Step>();
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step->drvPath = drvPath;
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if (!isNew) {
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assert(step->created);
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return step;
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}
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/* Initialize the step. Note that the step may be visible in
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‘steps’ before this point, but that doesn't matter because
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it's not runnable yet, and other threads won't make it
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runnable while step->created == false. */
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step->drv = readDerivation(drvPath);
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{
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auto i = step->drv.env.find("requiredSystemFeatures");
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if (i != step->drv.env.end())
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step->requiredSystemFeatures = tokenizeString<std::set<std::string>>(i->second);
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}
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newSteps.insert(step);
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/* Are all outputs valid? */
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bool valid = true;
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@ -728,94 +751,39 @@ Step::ptr State::createStep(std::shared_ptr<StoreAPI> store, const Path & drvPat
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/* No, we need to build. */
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printMsg(lvlDebug, format("creating build step ‘%1%’") % drvPath);
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newSteps.insert(step);
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/* Create steps for the dependencies. */
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bool hasDeps = false;
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for (auto & i : step->drv.inputDrvs) {
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Step::ptr dep = createStep(store, i.first, newSteps, newRunnable);
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auto dep = createStep(store, i.first, 0, step, newSteps, newRunnable);
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if (dep) {
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hasDeps = true;
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auto step_(step->state.lock());
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auto dep_(dep->state.lock());
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step_->deps.insert(dep);
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dep_->rdeps.push_back(step);
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}
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}
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/* If the step has no (remaining) dependencies, make it
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runnable. */
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{
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auto steps_(steps.lock());
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assert(steps_->find(drvPath) == steps_->end());
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(*steps_)[drvPath] = step;
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auto step_(step->state.lock());
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assert(!step->created);
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step->created = true;
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if (step_->deps.empty())
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newRunnable.insert(step);
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}
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if (!hasDeps) newRunnable.insert(step);
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return step;
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}
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void State::destroyStep(Step::ptr step, bool proceed)
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/* Get the steps and unfinished builds that depend on the given step. */
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void getDependents(Step::ptr step, std::set<Build::ptr> & builds, std::set<Step::ptr> & steps)
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{
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if (step->destroyed) return;
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step->destroyed = true;
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printMsg(lvlDebug, format("destroying build step ‘%1%’") % step->drvPath);
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nrStepsDone++;
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{
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auto steps_(steps.lock());
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steps_->erase(step->drvPath);
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}
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std::vector<Step::wptr> rdeps;
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{
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auto step_(step->state.lock());
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rdeps = step_->rdeps;
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/* Sanity checks. */
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for (auto & build_ : step_->builds) {
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auto build = build_.lock();
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if (!build) continue;
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assert(build->drvPath == step->drvPath);
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assert(build->finishedInDB);
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}
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}
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for (auto & rdep_ : rdeps) {
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auto rdep = rdep_.lock();
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if (!rdep) continue;
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bool runnable = false;
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{
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auto rdep_(rdep->state.lock());
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assert(has(rdep_->deps, step));
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rdep_->deps.erase(step);
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if (rdep_->deps.empty()) runnable = true;
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}
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if (proceed) {
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/* If this rdep has no other dependencies, then we can now
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build it. */
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if (runnable)
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makeRunnable(rdep);
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} else
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/* If ‘step’ failed or was cancelled, then delete all
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dependent steps as well. */
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destroyStep(rdep, false);
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}
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}
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std::set<Build::ptr> State::getDependentBuilds(Step::ptr step)
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{
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std::set<Step::ptr> done;
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std::set<Build::ptr> res;
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std::function<void(Step::ptr)> visit;
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visit = [&](Step::ptr step) {
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if (has(done, step)) return;
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done.insert(step);
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if (has(steps, step)) return;
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steps.insert(step);
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std::vector<Step::wptr> rdeps;
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@ -824,7 +792,7 @@ std::set<Build::ptr> State::getDependentBuilds(Step::ptr step)
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for (auto & build : step_->builds) {
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auto build_ = build.lock();
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if (build_) res.insert(build_);
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if (build_ && !build_->finishedInDB) builds.insert(build_);
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}
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/* Make a copy of rdeps so that we don't hold the lock for
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@ -839,8 +807,6 @@ std::set<Build::ptr> State::getDependentBuilds(Step::ptr step)
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};
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visit(step);
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return res;
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}
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@ -850,6 +816,8 @@ void State::makeRunnable(Step::ptr step)
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{
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auto step_(step->state.lock());
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assert(step->created);
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assert(!step->finished);
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assert(step_->deps.empty());
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}
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@ -913,7 +881,7 @@ void State::dispatcher()
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if (machine->currentJobs >= machine->maxJobs) continue;
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auto runnable_(runnable.lock());
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printMsg(lvlDebug, format("%1% runnable builds") % runnable_->size());
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//printMsg(lvlDebug, format("%1% runnable builds") % runnable_->size());
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/* FIXME: we're holding the runnable lock too long
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here. This could be more efficient. */
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@ -1024,6 +992,12 @@ void State::builder(Step::ptr step, MachineReservation::ptr reservation)
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bool State::doBuildStep(std::shared_ptr<StoreAPI> store, Step::ptr step,
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Machine::ptr machine)
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{
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{
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auto step_(step->state.lock());
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assert(step->created);
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assert(!step->finished);
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}
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/* There can be any number of builds in the database that depend
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on this derivation. Arbitrarily pick one (though preferring a
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build of which this is the top-level derivation) for the
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@ -1034,7 +1008,9 @@ bool State::doBuildStep(std::shared_ptr<StoreAPI> store, Step::ptr step,
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Build::ptr build;
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{
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auto dependents = getDependentBuilds(step);
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std::set<Build::ptr> dependents;
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std::set<Step::ptr> steps;
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getDependents(step, dependents, steps);
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if (dependents.empty()) {
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/* Apparently all builds that depend on this derivation
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@ -1117,112 +1093,176 @@ bool State::doBuildStep(std::shared_ptr<StoreAPI> store, Step::ptr step,
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}
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}
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/* Remove this step. After this, incoming builds that depend on
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drvPath will either see that the output paths exist, or will
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create a new build step for drvPath. The latter is fine - it
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won't conflict with this one, because we're removing it. In any
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case, the set of dependent builds for ‘step’ can't increase
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anymore because ‘step’ is no longer visible to createStep(). */
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auto steps_(steps.lock());
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steps_->erase(step->drvPath);
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if (result.status == RemoteResult::rrSuccess) {
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/* Get the final set of dependent builds. */
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auto dependents = getDependentBuilds(step);
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/* Register success in the database for all Build objects that
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have this step as the top-level step. Since the queue
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monitor thread may be creating new referring Builds
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concurrently, and updating the database may fail, we do
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this in a loop, marking all known builds, repeating until
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there are no unmarked builds.
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*/
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while (true) {
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std::set<Build::ptr> direct;
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{
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auto step_(step->state.lock());
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for (auto & build : step_->builds) {
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auto build_ = build.lock();
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if (build_) direct.insert(build_);
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}
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}
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/* Get the builds that have this one as the top-level. */
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std::vector<Build::ptr> direct;
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{
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auto steps_(steps.lock());
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auto step_(step->state.lock());
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/* Update the database. */
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{
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pqxx::work txn(*conn);
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for (auto & b_ : step_->builds) {
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auto b = b_.lock();
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if (b && !b->finishedInDB) direct.push_back(b);
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}
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if (result.status == RemoteResult::rrSuccess) {
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finishBuildStep(txn, result.startTime, result.stopTime, build->id, stepNr, machine->sshName, bssSuccess);
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/* Mark all builds of which this derivation is the top
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level as succeeded. */
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for (auto build2 : direct)
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markSucceededBuild(txn, build2, res, build != build2,
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result.startTime, result.stopTime);
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} else {
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/* Failure case. */
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BuildStatus buildStatus =
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result.status == RemoteResult::rrPermanentFailure ? bsFailed :
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result.status == RemoteResult::rrTimedOut ? bsTimedOut :
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bsAborted;
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BuildStepStatus buildStepStatus =
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result.status == RemoteResult::rrPermanentFailure ? bssFailed :
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result.status == RemoteResult::rrTimedOut ? bssTimedOut :
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bssAborted;
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/* For regular failures, we don't care about the error
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message. */
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if (buildStatus != bsAborted) result.errorMsg = "";
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/* Create failed build steps for every build that depends
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on this. For cached failures, only create a step for
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builds that don't have this step as top-level
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(otherwise the user won't be able to see what caused
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the build to fail). */
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for (auto build2 : dependents) {
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if (build == build2) continue;
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if (cachedFailure && build2->drvPath == step->drvPath) continue;
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createBuildStep(txn, 0, build2, step, machine->sshName,
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buildStepStatus, result.errorMsg, build->id);
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/* If there are no builds left to update in the DB,
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then we're done. Delete the step from
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‘steps’. Since we've been holding the ‘steps’ lock,
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no new referrers can have been added in the
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meantime or be added afterwards. */
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if (direct.empty()) {
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printMsg(lvlDebug, format("finishing build step ‘%1%’") % step->drvPath);
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nrStepsDone++;
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steps_->erase(step->drvPath);
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break;
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}
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}
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if (!cachedFailure)
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finishBuildStep(txn, result.startTime, result.stopTime, build->id,
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stepNr, machine->sshName, buildStepStatus, result.errorMsg);
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/* Update the database. */
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{
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pqxx::work txn(*conn);
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/* Mark all builds that depend on this derivation as failed. */
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for (auto build2 : dependents) {
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printMsg(lvlError, format("marking build %1% as failed") % build2->id);
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txn.parameterized
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("update Builds set finished = 1, busy = 0, buildStatus = $2, startTime = $3, stopTime = $4, isCachedBuild = $5 where id = $1")
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(build2->id)
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((int) (build2->drvPath != step->drvPath && buildStatus == bsFailed ? bsDepFailed : buildStatus))
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(result.startTime)
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(result.stopTime)
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(cachedFailure ? 1 : 0).exec();
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build2->finishedInDB = true; // FIXME: txn might fail
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nrBuildsDone++;
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finishBuildStep(txn, result.startTime, result.stopTime, build->id, stepNr, machine->sshName, bssSuccess);
|
||||
|
||||
for (auto & b : direct)
|
||||
markSucceededBuild(txn, b, res, build != b,
|
||||
result.startTime, result.stopTime);
|
||||
|
||||
txn.commit();
|
||||
}
|
||||
|
||||
/* Remember failed paths in the database so that they
|
||||
won't be built again. */
|
||||
if (!cachedFailure && result.status == RemoteResult::rrPermanentFailure)
|
||||
for (auto & path : outputPaths(step->drv))
|
||||
txn.parameterized("insert into FailedPaths values ($1)")(path).exec();
|
||||
/* Remove the direct dependencies from ‘builds’. This will
|
||||
cause them to be destroyed. */
|
||||
for (auto & b : direct) {
|
||||
auto builds_(builds.lock());
|
||||
b->finishedInDB = true;
|
||||
builds_->erase(b->id);
|
||||
}
|
||||
}
|
||||
|
||||
/* Wake up any dependent steps that have no other
|
||||
dependencies. */
|
||||
{
|
||||
auto step_(step->state.lock());
|
||||
for (auto & rdepWeak : step_->rdeps) {
|
||||
auto rdep = rdepWeak.lock();
|
||||
if (!rdep) continue;
|
||||
|
||||
bool runnable = false;
|
||||
{
|
||||
auto rdep_(rdep->state.lock());
|
||||
rdep_->deps.erase(step);
|
||||
if (rdep_->deps.empty()) runnable = true;
|
||||
}
|
||||
|
||||
if (runnable) makeRunnable(rdep);
|
||||
}
|
||||
}
|
||||
|
||||
} else {
|
||||
|
||||
/* Register failure in the database for all Build objects that
|
||||
directly or indirectly depend on this step. */
|
||||
|
||||
while (true) {
|
||||
|
||||
/* Get the builds and steps that depend on this step. */
|
||||
std::set<Build::ptr> indirect;
|
||||
{
|
||||
auto steps_(steps.lock());
|
||||
std::set<Step::ptr> steps;
|
||||
getDependents(step, indirect, steps);
|
||||
|
||||
/* If there are no builds left, delete all referring
|
||||
steps from ‘steps’. As for the success case, we can
|
||||
be certain no new referrers can be added. */
|
||||
if (indirect.empty()) {
|
||||
for (auto & s : steps) {
|
||||
printMsg(lvlDebug, format("finishing build step ‘%1%’") % step->drvPath);
|
||||
nrStepsDone++;
|
||||
steps_->erase(s->drvPath);
|
||||
}
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* Update the database. */
|
||||
{
|
||||
pqxx::work txn(*conn);
|
||||
|
||||
BuildStatus buildStatus =
|
||||
result.status == RemoteResult::rrPermanentFailure ? bsFailed :
|
||||
result.status == RemoteResult::rrTimedOut ? bsTimedOut :
|
||||
bsAborted;
|
||||
BuildStepStatus buildStepStatus =
|
||||
result.status == RemoteResult::rrPermanentFailure ? bssFailed :
|
||||
result.status == RemoteResult::rrTimedOut ? bssTimedOut :
|
||||
bssAborted;
|
||||
|
||||
/* For regular failures, we don't care about the error
|
||||
message. */
|
||||
if (buildStatus != bsAborted) result.errorMsg = "";
|
||||
|
||||
/* Create failed build steps for every build that depends
|
||||
on this. For cached failures, only create a step for
|
||||
builds that don't have this step as top-level
|
||||
(otherwise the user won't be able to see what caused
|
||||
the build to fail). */
|
||||
for (auto & build2 : indirect) {
|
||||
if (build == build2) continue;
|
||||
if (cachedFailure && build2->drvPath == step->drvPath) continue;
|
||||
createBuildStep(txn, 0, build2, step, machine->sshName,
|
||||
buildStepStatus, result.errorMsg, build->id);
|
||||
}
|
||||
|
||||
if (!cachedFailure)
|
||||
finishBuildStep(txn, result.startTime, result.stopTime, build->id,
|
||||
stepNr, machine->sshName, buildStepStatus, result.errorMsg);
|
||||
|
||||
/* Mark all builds that depend on this derivation as failed. */
|
||||
for (auto & build2 : indirect) {
|
||||
printMsg(lvlError, format("marking build %1% as failed") % build2->id);
|
||||
assert(!build->finishedInDB);
|
||||
txn.parameterized
|
||||
("update Builds set finished = 1, busy = 0, buildStatus = $2, startTime = $3, stopTime = $4, isCachedBuild = $5 where id = $1")
|
||||
(build2->id)
|
||||
((int) (build2->drvPath != step->drvPath && buildStatus == bsFailed ? bsDepFailed : buildStatus))
|
||||
(result.startTime)
|
||||
(result.stopTime)
|
||||
(cachedFailure ? 1 : 0).exec();
|
||||
nrBuildsDone++;
|
||||
}
|
||||
|
||||
/* Remember failed paths in the database so that they
|
||||
won't be built again. */
|
||||
if (!cachedFailure && result.status == RemoteResult::rrPermanentFailure)
|
||||
for (auto & path : outputPaths(step->drv))
|
||||
txn.parameterized("insert into FailedPaths values ($1)")(path).exec();
|
||||
|
||||
txn.commit();
|
||||
}
|
||||
|
||||
/* Remove the indirect dependencies from ‘builds’. This
|
||||
will cause them to be destroyed. */
|
||||
for (auto & b : indirect) {
|
||||
auto builds_(builds.lock());
|
||||
b->finishedInDB = true;
|
||||
builds_->erase(b->id);
|
||||
}
|
||||
}
|
||||
|
||||
txn.commit();
|
||||
}
|
||||
|
||||
/* In case of success, destroy all Build objects of which ‘step’
|
||||
is the top-level derivation. In case of failure, destroy all
|
||||
dependent Build objects. Any Steps not referenced by other
|
||||
Builds will be destroyed as well. */
|
||||
for (auto build2 : dependents)
|
||||
if (build2->toplevel == step || result.status != RemoteResult::rrSuccess) {
|
||||
auto builds_(builds.lock());
|
||||
builds_->erase(build2->id);
|
||||
}
|
||||
|
||||
/* Remove the step from the graph. In case of success, make
|
||||
dependent build steps runnable if they have no other
|
||||
dependencies. */
|
||||
destroyStep(step, result.status == RemoteResult::rrSuccess);
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
|
|
@ -1232,6 +1272,8 @@ void State::markSucceededBuild(pqxx::work & txn, Build::ptr build,
|
|||
{
|
||||
printMsg(lvlInfo, format("marking build %1% as succeeded") % build->id);
|
||||
|
||||
assert(!build->finishedInDB);
|
||||
|
||||
txn.parameterized
|
||||
("update Builds set finished = 1, busy = 0, buildStatus = $2, startTime = $3, stopTime = $4, size = $5, closureSize = $6, releaseName = $7, isCachedBuild = $8 where id = $1")
|
||||
(build->id)
|
||||
|
|
@ -1259,7 +1301,6 @@ void State::markSucceededBuild(pqxx::work & txn, Build::ptr build,
|
|||
(product.defaultPath).exec();
|
||||
}
|
||||
|
||||
build->finishedInDB = true; // FIXME: txn might fail
|
||||
nrBuildsDone++;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue