/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loop-simple/nested_1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7968f31 [2022-03-18 01:03:25,440 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-18 01:03:25,442 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-18 01:03:25,481 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-03-18 01:03:25,481 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-03-18 01:03:25,482 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-03-18 01:03:25,483 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-03-18 01:03:25,485 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-03-18 01:03:25,487 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-03-18 01:03:25,490 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-03-18 01:03:25,491 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-03-18 01:03:25,493 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-03-18 01:03:25,494 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-03-18 01:03:25,501 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-03-18 01:03:25,502 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-03-18 01:03:25,504 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-03-18 01:03:25,505 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-03-18 01:03:25,506 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-03-18 01:03:25,511 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-03-18 01:03:25,515 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-03-18 01:03:25,516 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-03-18 01:03:25,518 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-03-18 01:03:25,519 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-03-18 01:03:25,521 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-03-18 01:03:25,522 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-03-18 01:03:25,527 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-03-18 01:03:25,527 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-03-18 01:03:25,527 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-03-18 01:03:25,528 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-03-18 01:03:25,528 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-03-18 01:03:25,529 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-03-18 01:03:25,529 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-03-18 01:03:25,530 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-03-18 01:03:25,530 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-03-18 01:03:25,531 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-03-18 01:03:25,531 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-03-18 01:03:25,531 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-03-18 01:03:25,532 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-03-18 01:03:25,532 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-03-18 01:03:25,532 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-18 01:03:25,533 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-18 01:03:25,538 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-18 01:03:25,539 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-18 01:03:25,549 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-18 01:03:25,549 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-18 01:03:25,550 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-18 01:03:25,550 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-18 01:03:25,550 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-18 01:03:25,551 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-18 01:03:25,551 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-18 01:03:25,551 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-18 01:03:25,551 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-18 01:03:25,552 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-18 01:03:25,552 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-18 01:03:25,552 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-18 01:03:25,552 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-18 01:03:25,552 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-18 01:03:25,553 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-18 01:03:25,553 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 01:03:25,553 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-18 01:03:25,553 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-18 01:03:25,553 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-18 01:03:25,553 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-18 01:03:25,554 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-18 01:03:25,554 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-18 01:03:25,554 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-18 01:03:25,759 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-18 01:03:25,782 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-18 01:03:25,785 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-18 01:03:25,786 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-18 01:03:25,787 INFO L275 PluginConnector]: CDTParser initialized [2022-03-18 01:03:25,787 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-simple/nested_1.c [2022-03-18 01:03:25,850 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/595f6febb/af4cbf2503d3427a8292f57b8bc58028/FLAGa0ca8089d [2022-03-18 01:03:26,167 INFO L306 CDTParser]: Found 1 translation units. [2022-03-18 01:03:26,168 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_1.c [2022-03-18 01:03:26,172 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/595f6febb/af4cbf2503d3427a8292f57b8bc58028/FLAGa0ca8089d [2022-03-18 01:03:26,626 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/595f6febb/af4cbf2503d3427a8292f57b8bc58028 [2022-03-18 01:03:26,628 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-18 01:03:26,629 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-18 01:03:26,631 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-18 01:03:26,631 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-18 01:03:26,637 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-18 01:03:26,637 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 01:03:26" (1/1) ... [2022-03-18 01:03:26,638 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@52de9bf8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:03:26, skipping insertion in model container [2022-03-18 01:03:26,638 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 01:03:26" (1/1) ... [2022-03-18 01:03:26,643 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-18 01:03:26,655 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-18 01:03:26,794 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_1.c[676,689] [2022-03-18 01:03:26,798 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 01:03:26,803 INFO L203 MainTranslator]: Completed pre-run [2022-03-18 01:03:26,813 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_1.c[676,689] [2022-03-18 01:03:26,814 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 01:03:26,826 INFO L208 MainTranslator]: Completed translation [2022-03-18 01:03:26,827 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:03:26 WrapperNode [2022-03-18 01:03:26,827 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-18 01:03:26,828 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-18 01:03:26,828 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-18 01:03:26,829 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-18 01:03:26,839 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:03:26" (1/1) ... [2022-03-18 01:03:26,839 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:03:26" (1/1) ... [2022-03-18 01:03:26,847 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:03:26" (1/1) ... [2022-03-18 01:03:26,848 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:03:26" (1/1) ... [2022-03-18 01:03:26,850 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:03:26" (1/1) ... [2022-03-18 01:03:26,853 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:03:26" (1/1) ... [2022-03-18 01:03:26,853 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:03:26" (1/1) ... [2022-03-18 01:03:26,854 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-18 01:03:26,855 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-18 01:03:26,855 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-18 01:03:26,855 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-18 01:03:26,856 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:03:26" (1/1) ... [2022-03-18 01:03:26,862 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 01:03:26,871 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 01:03:26,883 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-18 01:03:26,894 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-18 01:03:26,911 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-18 01:03:26,911 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-18 01:03:26,911 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-18 01:03:26,912 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-18 01:03:26,912 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-18 01:03:26,912 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-18 01:03:26,913 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-18 01:03:26,913 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-18 01:03:26,913 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-18 01:03:26,913 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-18 01:03:26,914 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-18 01:03:26,914 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-18 01:03:26,914 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-18 01:03:26,914 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-18 01:03:26,959 INFO L234 CfgBuilder]: Building ICFG [2022-03-18 01:03:26,960 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-18 01:03:27,016 INFO L275 CfgBuilder]: Performing block encoding [2022-03-18 01:03:27,021 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-18 01:03:27,021 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-18 01:03:27,022 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 01:03:27 BoogieIcfgContainer [2022-03-18 01:03:27,023 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-18 01:03:27,024 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-18 01:03:27,024 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-18 01:03:27,027 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-18 01:03:27,027 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.03 01:03:26" (1/3) ... [2022-03-18 01:03:27,028 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b065739 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 01:03:27, skipping insertion in model container [2022-03-18 01:03:27,028 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 01:03:26" (2/3) ... [2022-03-18 01:03:27,028 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b065739 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 01:03:27, skipping insertion in model container [2022-03-18 01:03:27,028 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 01:03:27" (3/3) ... [2022-03-18 01:03:27,029 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_1.c [2022-03-18 01:03:27,033 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-18 01:03:27,033 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-18 01:03:27,079 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-18 01:03:27,084 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-18 01:03:27,084 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-18 01:03:27,095 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 01:03:27,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-03-18 01:03:27,101 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:03:27,101 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:03:27,102 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:03:27,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:03:27,106 INFO L85 PathProgramCache]: Analyzing trace with hash -1887993331, now seen corresponding path program 1 times [2022-03-18 01:03:27,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:03:27,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [177224130] [2022-03-18 01:03:27,122 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 01:03:27,122 INFO L85 PathProgramCache]: Analyzing trace with hash -1887993331, now seen corresponding path program 2 times [2022-03-18 01:03:27,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:03:27,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661269731] [2022-03-18 01:03:27,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:03:27,125 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:03:27,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:03:27,247 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 01:03:27,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:03:27,289 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 01:03:27,290 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:03:27,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661269731] [2022-03-18 01:03:27,291 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [661269731] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:03:27,291 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:03:27,291 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 01:03:27,293 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:03:27,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [177224130] [2022-03-18 01:03:27,293 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [177224130] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:03:27,293 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:03:27,294 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 01:03:27,294 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371762731] [2022-03-18 01:03:27,294 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:03:27,297 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-18 01:03:27,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:03:27,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-18 01:03:27,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 01:03:27,336 INFO L87 Difference]: Start difference. First operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:27,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:03:27,377 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2022-03-18 01:03:27,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-18 01:03:27,379 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2022-03-18 01:03:27,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:03:27,384 INFO L225 Difference]: With dead ends: 24 [2022-03-18 01:03:27,384 INFO L226 Difference]: Without dead ends: 11 [2022-03-18 01:03:27,386 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 01:03:27,389 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 9 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 01:03:27,390 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 19 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 01:03:27,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2022-03-18 01:03:27,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2022-03-18 01:03:27,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:27,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2022-03-18 01:03:27,416 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2022-03-18 01:03:27,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:03:27,417 INFO L478 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2022-03-18 01:03:27,417 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:27,417 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2022-03-18 01:03:27,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-03-18 01:03:27,418 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:03:27,418 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:03:27,418 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-18 01:03:27,418 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:03:27,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:03:27,419 INFO L85 PathProgramCache]: Analyzing trace with hash -1887999097, now seen corresponding path program 1 times [2022-03-18 01:03:27,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:03:27,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [282329347] [2022-03-18 01:03:27,420 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 01:03:27,420 INFO L85 PathProgramCache]: Analyzing trace with hash -1887999097, now seen corresponding path program 2 times [2022-03-18 01:03:27,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:03:27,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336339393] [2022-03-18 01:03:27,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:03:27,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:03:27,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:03:27,461 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 01:03:27,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:03:27,470 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 01:03:27,470 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:03:27,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336339393] [2022-03-18 01:03:27,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [336339393] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:03:27,471 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:03:27,471 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 01:03:27,471 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:03:27,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [282329347] [2022-03-18 01:03:27,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [282329347] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:03:27,471 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:03:27,472 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 01:03:27,472 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235410730] [2022-03-18 01:03:27,472 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:03:27,472 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-18 01:03:27,473 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:03:27,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-18 01:03:27,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-18 01:03:27,473 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:27,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:03:27,496 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2022-03-18 01:03:27,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-18 01:03:27,496 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2022-03-18 01:03:27,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:03:27,497 INFO L225 Difference]: With dead ends: 16 [2022-03-18 01:03:27,497 INFO L226 Difference]: Without dead ends: 13 [2022-03-18 01:03:27,497 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-18 01:03:27,498 INFO L912 BasicCegarLoop]: 9 mSDtfsCounter, 8 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 01:03:27,499 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 16 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 01:03:27,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-03-18 01:03:27,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2022-03-18 01:03:27,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:27,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2022-03-18 01:03:27,504 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2022-03-18 01:03:27,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:03:27,504 INFO L478 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2022-03-18 01:03:27,504 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:27,504 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2022-03-18 01:03:27,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-18 01:03:27,505 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:03:27,505 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:03:27,505 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-18 01:03:27,505 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:03:27,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:03:27,506 INFO L85 PathProgramCache]: Analyzing trace with hash -1889274843, now seen corresponding path program 1 times [2022-03-18 01:03:27,506 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:03:27,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2063463657] [2022-03-18 01:03:27,608 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 01:03:27,609 INFO L85 PathProgramCache]: Analyzing trace with hash 1602266855, now seen corresponding path program 1 times [2022-03-18 01:03:27,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:03:27,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559352568] [2022-03-18 01:03:27,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:03:27,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:03:27,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:03:27,691 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 01:03:27,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:03:27,705 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 01:03:27,706 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:03:27,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559352568] [2022-03-18 01:03:27,706 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559352568] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:03:27,706 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:03:27,706 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 01:03:27,726 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:03:27,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2063463657] [2022-03-18 01:03:27,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2063463657] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:03:27,727 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:03:27,727 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 01:03:27,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740004680] [2022-03-18 01:03:27,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:03:27,728 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 01:03:27,728 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:03:27,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 01:03:27,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-18 01:03:27,729 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:27,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:03:27,775 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2022-03-18 01:03:27,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 01:03:27,775 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-03-18 01:03:27,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:03:27,776 INFO L225 Difference]: With dead ends: 18 [2022-03-18 01:03:27,776 INFO L226 Difference]: Without dead ends: 15 [2022-03-18 01:03:27,777 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-03-18 01:03:27,781 INFO L912 BasicCegarLoop]: 9 mSDtfsCounter, 9 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 01:03:27,781 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 21 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 01:03:27,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-03-18 01:03:27,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2022-03-18 01:03:27,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:27,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2022-03-18 01:03:27,785 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2022-03-18 01:03:27,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:03:27,785 INFO L478 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2022-03-18 01:03:27,786 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:27,786 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2022-03-18 01:03:27,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-03-18 01:03:27,797 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:03:27,798 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:03:27,798 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-18 01:03:27,800 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:03:27,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:03:27,801 INFO L85 PathProgramCache]: Analyzing trace with hash 1179700547, now seen corresponding path program 2 times [2022-03-18 01:03:27,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:03:27,805 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1649666246] [2022-03-18 01:03:27,867 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 01:03:27,868 INFO L85 PathProgramCache]: Analyzing trace with hash 1602328359, now seen corresponding path program 1 times [2022-03-18 01:03:27,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:03:27,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1876584827] [2022-03-18 01:03:27,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:03:27,869 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:03:27,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:03:27,907 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 01:03:27,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:03:27,914 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 01:03:27,914 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:03:27,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1876584827] [2022-03-18 01:03:27,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1876584827] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:03:27,915 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:03:27,915 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 01:03:27,931 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:03:27,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1649666246] [2022-03-18 01:03:27,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1649666246] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:03:27,931 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:03:27,931 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 01:03:27,932 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469524831] [2022-03-18 01:03:27,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:03:27,932 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 01:03:27,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:03:27,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 01:03:27,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-18 01:03:27,933 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:27,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:03:27,979 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2022-03-18 01:03:27,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 01:03:27,979 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2022-03-18 01:03:27,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:03:27,980 INFO L225 Difference]: With dead ends: 20 [2022-03-18 01:03:27,980 INFO L226 Difference]: Without dead ends: 17 [2022-03-18 01:03:27,981 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-03-18 01:03:27,981 INFO L912 BasicCegarLoop]: 9 mSDtfsCounter, 10 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 01:03:27,982 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 26 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 01:03:27,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-18 01:03:27,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2022-03-18 01:03:27,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:27,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2022-03-18 01:03:27,986 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2022-03-18 01:03:27,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:03:27,986 INFO L478 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2022-03-18 01:03:27,987 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:27,987 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2022-03-18 01:03:27,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-18 01:03:27,987 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:03:27,987 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:03:27,988 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-18 01:03:27,988 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:03:27,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:03:27,988 INFO L85 PathProgramCache]: Analyzing trace with hash -177482015, now seen corresponding path program 3 times [2022-03-18 01:03:27,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:03:27,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1542804375] [2022-03-18 01:03:28,045 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 01:03:28,046 INFO L85 PathProgramCache]: Analyzing trace with hash 1602389863, now seen corresponding path program 1 times [2022-03-18 01:03:28,046 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:03:28,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75092271] [2022-03-18 01:03:28,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:03:28,047 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:03:28,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:03:28,073 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 01:03:28,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:03:28,079 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 01:03:28,079 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:03:28,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75092271] [2022-03-18 01:03:28,080 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [75092271] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:03:28,080 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:03:28,080 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 01:03:28,101 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:03:28,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1542804375] [2022-03-18 01:03:28,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1542804375] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:03:28,102 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:03:28,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-18 01:03:28,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732697942] [2022-03-18 01:03:28,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:03:28,102 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-18 01:03:28,103 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:03:28,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-18 01:03:28,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-03-18 01:03:28,103 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:28,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:03:28,167 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2022-03-18 01:03:28,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-18 01:03:28,168 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-18 01:03:28,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:03:28,168 INFO L225 Difference]: With dead ends: 22 [2022-03-18 01:03:28,168 INFO L226 Difference]: Without dead ends: 19 [2022-03-18 01:03:28,169 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2022-03-18 01:03:28,170 INFO L912 BasicCegarLoop]: 9 mSDtfsCounter, 11 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 01:03:28,170 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 31 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 01:03:28,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-03-18 01:03:28,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2022-03-18 01:03:28,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:28,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2022-03-18 01:03:28,175 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2022-03-18 01:03:28,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:03:28,176 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2022-03-18 01:03:28,176 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:28,176 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2022-03-18 01:03:28,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-18 01:03:28,177 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:03:28,177 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:03:28,177 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-03-18 01:03:28,177 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:03:28,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:03:28,178 INFO L85 PathProgramCache]: Analyzing trace with hash 1240133887, now seen corresponding path program 4 times [2022-03-18 01:03:28,178 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:03:28,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [30785083] [2022-03-18 01:03:28,219 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 01:03:28,220 INFO L85 PathProgramCache]: Analyzing trace with hash 1602451367, now seen corresponding path program 1 times [2022-03-18 01:03:28,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:03:28,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077645800] [2022-03-18 01:03:28,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:03:28,221 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:03:28,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:03:28,247 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 01:03:28,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:03:28,253 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 01:03:28,253 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:03:28,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077645800] [2022-03-18 01:03:28,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1077645800] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:03:28,253 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:03:28,254 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 01:03:28,282 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:03:28,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [30785083] [2022-03-18 01:03:28,282 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [30785083] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:03:28,283 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:03:28,283 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-18 01:03:28,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172259134] [2022-03-18 01:03:28,283 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:03:28,283 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-18 01:03:28,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:03:28,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-18 01:03:28,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-03-18 01:03:28,284 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:28,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:03:28,369 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2022-03-18 01:03:28,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-18 01:03:28,369 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-18 01:03:28,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:03:28,371 INFO L225 Difference]: With dead ends: 24 [2022-03-18 01:03:28,371 INFO L226 Difference]: Without dead ends: 21 [2022-03-18 01:03:28,372 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2022-03-18 01:03:28,375 INFO L912 BasicCegarLoop]: 9 mSDtfsCounter, 12 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 01:03:28,376 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 36 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 01:03:28,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-18 01:03:28,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2022-03-18 01:03:28,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:28,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2022-03-18 01:03:28,387 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2022-03-18 01:03:28,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:03:28,387 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2022-03-18 01:03:28,388 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:28,388 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2022-03-18 01:03:28,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-18 01:03:28,389 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:03:28,390 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:03:28,390 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-03-18 01:03:28,390 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:03:28,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:03:28,391 INFO L85 PathProgramCache]: Analyzing trace with hash 2064382877, now seen corresponding path program 5 times [2022-03-18 01:03:28,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:03:28,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2037263588] [2022-03-18 01:03:28,432 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 01:03:28,433 INFO L85 PathProgramCache]: Analyzing trace with hash 1602512871, now seen corresponding path program 1 times [2022-03-18 01:03:28,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:03:28,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1183719313] [2022-03-18 01:03:28,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:03:28,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:03:28,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:03:28,479 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 01:03:28,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:03:28,495 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 01:03:28,495 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:03:28,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1183719313] [2022-03-18 01:03:28,496 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1183719313] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:03:28,496 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:03:28,496 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 01:03:28,562 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:03:28,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2037263588] [2022-03-18 01:03:28,562 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2037263588] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:03:28,563 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:03:28,563 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-18 01:03:28,563 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415282526] [2022-03-18 01:03:28,564 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:03:28,565 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-18 01:03:28,567 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:03:28,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-18 01:03:28,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2022-03-18 01:03:28,574 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:28,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:03:28,688 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2022-03-18 01:03:28,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 01:03:28,689 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-03-18 01:03:28,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:03:28,689 INFO L225 Difference]: With dead ends: 26 [2022-03-18 01:03:28,690 INFO L226 Difference]: Without dead ends: 23 [2022-03-18 01:03:28,690 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 10 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-03-18 01:03:28,691 INFO L912 BasicCegarLoop]: 9 mSDtfsCounter, 13 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 01:03:28,691 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 41 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 01:03:28,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-18 01:03:28,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2022-03-18 01:03:28,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 18 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:28,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2022-03-18 01:03:28,703 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2022-03-18 01:03:28,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:03:28,703 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2022-03-18 01:03:28,703 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 8 states have internal predecessors, (16), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:28,703 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2022-03-18 01:03:28,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-18 01:03:28,704 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 01:03:28,704 INFO L500 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 01:03:28,704 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-03-18 01:03:28,704 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 01:03:28,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 01:03:28,705 INFO L85 PathProgramCache]: Analyzing trace with hash -401287493, now seen corresponding path program 6 times [2022-03-18 01:03:28,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 01:03:28,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [841698899] [2022-03-18 01:03:28,750 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 01:03:28,750 INFO L85 PathProgramCache]: Analyzing trace with hash 1602574375, now seen corresponding path program 1 times [2022-03-18 01:03:28,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 01:03:28,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [869188653] [2022-03-18 01:03:28,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 01:03:28,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 01:03:28,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:03:28,797 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 01:03:28,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 01:03:28,802 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 01:03:28,802 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 01:03:28,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [869188653] [2022-03-18 01:03:28,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [869188653] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:03:28,802 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:03:28,802 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 01:03:28,861 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 01:03:28,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [841698899] [2022-03-18 01:03:28,862 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [841698899] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 01:03:28,862 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 01:03:28,862 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-18 01:03:28,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533379669] [2022-03-18 01:03:28,862 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 01:03:28,862 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-18 01:03:28,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 01:03:28,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-18 01:03:28,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2022-03-18 01:03:28,863 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:28,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 01:03:28,973 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2022-03-18 01:03:28,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-18 01:03:28,974 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-18 01:03:28,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 01:03:28,974 INFO L225 Difference]: With dead ends: 25 [2022-03-18 01:03:28,974 INFO L226 Difference]: Without dead ends: 0 [2022-03-18 01:03:28,975 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 9 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-03-18 01:03:28,975 INFO L912 BasicCegarLoop]: 6 mSDtfsCounter, 8 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 01:03:28,976 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 43 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 01:03:28,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-03-18 01:03:28,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-03-18 01:03:28,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-03-18 01:03:28,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-03-18 01:03:28,976 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 21 [2022-03-18 01:03:28,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 01:03:28,977 INFO L478 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-03-18 01:03:28,977 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 01:03:28,977 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-03-18 01:03:28,977 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-03-18 01:03:28,979 INFO L788 garLoopResultBuilder]: Registering result SAFE for location mainErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-03-18 01:03:28,981 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-03-18 01:03:28,982 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2022-03-18 01:03:29,071 INFO L882 garLoopResultBuilder]: For program point reach_errorEXIT(line 13) no Hoare annotation was computed. [2022-03-18 01:03:29,072 INFO L882 garLoopResultBuilder]: For program point reach_errorENTRY(line 13) no Hoare annotation was computed. [2022-03-18 01:03:29,072 INFO L882 garLoopResultBuilder]: For program point reach_errorFINAL(line 13) no Hoare annotation was computed. [2022-03-18 01:03:29,072 INFO L885 garLoopResultBuilder]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2022-03-18 01:03:29,072 INFO L878 garLoopResultBuilder]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#NULL.base)| |#NULL.base|)) [2022-03-18 01:03:29,072 INFO L885 garLoopResultBuilder]: At program point ULTIMATE.initEXIT(line -1) the Hoare annotation is: true [2022-03-18 01:03:29,073 INFO L885 garLoopResultBuilder]: At program point ULTIMATE.startEXIT(line -1) the Hoare annotation is: true [2022-03-18 01:03:29,073 INFO L885 garLoopResultBuilder]: At program point L-1(line -1) the Hoare annotation is: true [2022-03-18 01:03:29,073 INFO L885 garLoopResultBuilder]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2022-03-18 01:03:29,073 INFO L885 garLoopResultBuilder]: At program point ULTIMATE.startFINAL(line -1) the Hoare annotation is: true [2022-03-18 01:03:29,073 INFO L878 garLoopResultBuilder]: At program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 23) the Hoare annotation is: false [2022-03-18 01:03:29,073 INFO L885 garLoopResultBuilder]: At program point mainENTRY(lines 15 26) the Hoare annotation is: true [2022-03-18 01:03:29,073 INFO L885 garLoopResultBuilder]: At program point mainEXIT(lines 15 26) the Hoare annotation is: true [2022-03-18 01:03:29,073 INFO L878 garLoopResultBuilder]: At program point L23(line 23) the Hoare annotation is: false [2022-03-18 01:03:29,074 INFO L885 garLoopResultBuilder]: At program point L22-1(lines 22 24) the Hoare annotation is: true [2022-03-18 01:03:29,074 INFO L878 garLoopResultBuilder]: At program point L19-2(lines 19 21) the Hoare annotation is: (or (= main_~a~0 0) (= main_~a~0 1) (= 5 main_~a~0) (= main_~a~0 3) (= main_~a~0 2) (= main_~a~0 4)) [2022-03-18 01:03:29,074 INFO L878 garLoopResultBuilder]: At program point L19-3(lines 19 21) the Hoare annotation is: (or (= main_~a~0 0) (= main_~a~0 1) (= main_~a~0 6) (= 5 main_~a~0) (= main_~a~0 3) (= main_~a~0 2) (= main_~a~0 4)) [2022-03-18 01:03:29,074 INFO L878 garLoopResultBuilder]: At program point L19-4(lines 15 26) the Hoare annotation is: (= (+ main_~a~0 (- 4)) 2) [2022-03-18 01:03:29,074 INFO L885 garLoopResultBuilder]: At program point mainFINAL(lines 15 26) the Hoare annotation is: true [2022-03-18 01:03:29,077 INFO L718 BasicCegarLoop]: Path program histogram: [6, 2, 2, 1, 1, 1, 1, 1, 1] [2022-03-18 01:03:29,078 INFO L180 ceAbstractionStarter]: Computing trace abstraction results [2022-03-18 01:03:29,087 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.03 01:03:29 BoogieIcfgContainer [2022-03-18 01:03:29,088 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-03-18 01:03:29,088 INFO L158 Benchmark]: Toolchain (without parser) took 2458.80ms. Allocated memory was 184.5MB in the beginning and 227.5MB in the end (delta: 43.0MB). Free memory was 136.1MB in the beginning and 105.2MB in the end (delta: 31.0MB). Peak memory consumption was 75.0MB. Max. memory is 8.0GB. [2022-03-18 01:03:29,088 INFO L158 Benchmark]: CDTParser took 0.16ms. Allocated memory is still 184.5MB. Free memory was 152.5MB in the beginning and 152.5MB in the end (delta: 69.9kB). There was no memory consumed. Max. memory is 8.0GB. [2022-03-18 01:03:29,089 INFO L158 Benchmark]: CACSL2BoogieTranslator took 196.55ms. Allocated memory is still 184.5MB. Free memory was 135.9MB in the beginning and 162.4MB in the end (delta: -26.5MB). Peak memory consumption was 12.6MB. Max. memory is 8.0GB. [2022-03-18 01:03:29,089 INFO L158 Benchmark]: Boogie Preprocessor took 26.51ms. Allocated memory is still 184.5MB. Free memory was 162.4MB in the beginning and 161.1MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-03-18 01:03:29,089 INFO L158 Benchmark]: RCFGBuilder took 167.45ms. Allocated memory is still 184.5MB. Free memory was 161.1MB in the beginning and 152.2MB in the end (delta: 8.9MB). Peak memory consumption was 8.4MB. Max. memory is 8.0GB. [2022-03-18 01:03:29,090 INFO L158 Benchmark]: TraceAbstraction took 2063.74ms. Allocated memory was 184.5MB in the beginning and 227.5MB in the end (delta: 43.0MB). Free memory was 151.7MB in the beginning and 105.2MB in the end (delta: 46.5MB). Peak memory consumption was 90.2MB. Max. memory is 8.0GB. [2022-03-18 01:03:29,091 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16ms. Allocated memory is still 184.5MB. Free memory was 152.5MB in the beginning and 152.5MB in the end (delta: 69.9kB). There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 196.55ms. Allocated memory is still 184.5MB. Free memory was 135.9MB in the beginning and 162.4MB in the end (delta: -26.5MB). Peak memory consumption was 12.6MB. Max. memory is 8.0GB. * Boogie Preprocessor took 26.51ms. Allocated memory is still 184.5MB. Free memory was 162.4MB in the beginning and 161.1MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * RCFGBuilder took 167.45ms. Allocated memory is still 184.5MB. Free memory was 161.1MB in the beginning and 152.2MB in the end (delta: 8.9MB). Peak memory consumption was 8.4MB. Max. memory is 8.0GB. * TraceAbstraction took 2063.74ms. Allocated memory was 184.5MB in the beginning and 227.5MB in the end (delta: 43.0MB). Free memory was 151.7MB in the beginning and 105.2MB in the end (delta: 46.5MB). Peak memory consumption was 90.2MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 23]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 2.0s, OverallIterations: 8, TraceHistogramMax: 6, PathProgramHistogramMax: 6, EmptinessCheckTime: 0.0s, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 80 SdHoareTripleChecker+Valid, 0.2s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 80 mSDsluCounter, 233 SdHoareTripleChecker+Invalid, 0.2s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 157 mSDsCounter, 36 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 373 IncrementalHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 36 mSolverCounterUnsat, 76 mSDtfsCounter, 373 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 140 GetRequests, 68 SyntacticMatches, 8 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=7, InterpolantAutomatonStates: 52, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 8 MinimizatonAttempts, 6 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 16 LocationsWithAnnotation, 16 PreInvPairs, 35 NumberOfFragments, 65 HoareAnnotationTreeSize, 16 FomulaSimplifications, 156 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 16 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 19]: Loop Invariant Derived loop invariant: (((((a == 0 || a == 1) || a == 6) || 5 == a) || a == 3) || a == 2) || a == 4 - ProcedureContractResult [Line: 15]: Procedure Contract for main Derived contract for procedure main: 1 RESULT: Ultimate proved your program to be correct! [2022-03-18 01:03:29,123 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request...