/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o100.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:57:28,486 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:57:28,489 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:57:28,509 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:57:28,510 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:57:28,512 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:57:28,514 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:57:28,529 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:57:28,531 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:57:28,533 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:57:28,534 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:57:28,536 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:57:28,536 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:57:28,540 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:57:28,541 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:57:28,542 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:57:28,546 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:57:28,548 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:57:28,549 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:57:28,555 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:57:28,556 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:57:28,557 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:57:28,558 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:57:28,559 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:57:28,561 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:57:28,569 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:57:28,570 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:57:28,570 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:57:28,571 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 16:57:28,586 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:57:28,586 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:57:28,588 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:57:28,588 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:57:28,588 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:57:28,588 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:57:28,588 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:57:28,589 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:57:28,589 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:57:28,589 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:57:28,589 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:57:28,589 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:57:28,590 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:57:28,590 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:57:28,590 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:57:28,590 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:57:28,590 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:57:28,591 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:57:28,591 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:57:28,591 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:57:28,591 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:57:28,591 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:57:28,592 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:57:28,592 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:57:28,592 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:57:28,592 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:57:28,592 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:28,593 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:57:28,593 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:57:28,593 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:57:28,919 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:57:28,940 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:57:28,944 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:57:28,946 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:57:28,947 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:57:28,948 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o100.c [2020-07-20 16:57:29,036 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c8a5da16e/116b660406fc4531934a43e8412dd81c/FLAGb5543f22a [2020-07-20 16:57:29,593 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:57:29,593 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o100.c [2020-07-20 16:57:29,601 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c8a5da16e/116b660406fc4531934a43e8412dd81c/FLAGb5543f22a [2020-07-20 16:57:29,938 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c8a5da16e/116b660406fc4531934a43e8412dd81c [2020-07-20 16:57:29,949 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:57:29,952 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:57:29,953 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:57:29,953 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:57:29,957 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:57:29,958 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:57:29" (1/1) ... [2020-07-20 16:57:29,962 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2a462c8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:29, skipping insertion in model container [2020-07-20 16:57:29,962 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:57:29" (1/1) ... [2020-07-20 16:57:29,972 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:57:29,994 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:57:30,153 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:57:30,158 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:57:30,176 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:57:30,193 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:57:30,193 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30 WrapperNode [2020-07-20 16:57:30,194 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:57:30,195 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:57:30,195 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:57:30,195 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:57:30,210 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (1/1) ... [2020-07-20 16:57:30,211 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (1/1) ... [2020-07-20 16:57:30,217 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (1/1) ... [2020-07-20 16:57:30,217 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (1/1) ... [2020-07-20 16:57:30,221 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (1/1) ... [2020-07-20 16:57:30,223 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (1/1) ... [2020-07-20 16:57:30,224 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (1/1) ... [2020-07-20 16:57:30,225 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:57:30,225 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:57:30,226 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:57:30,226 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:57:30,227 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:57:30,410 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:57:30,410 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:57:30,410 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 16:57:30,410 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:57:30,410 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 16:57:30,411 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:57:30,411 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 16:57:30,411 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:57:30,411 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:57:30,411 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:57:30,591 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:57:30,591 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:57:30,595 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:57:30 BoogieIcfgContainer [2020-07-20 16:57:30,595 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:57:30,597 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:57:30,597 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:57:30,601 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:57:30,601 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:57:29" (1/3) ... [2020-07-20 16:57:30,603 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a38609c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:57:30, skipping insertion in model container [2020-07-20 16:57:30,603 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (2/3) ... [2020-07-20 16:57:30,603 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a38609c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:57:30, skipping insertion in model container [2020-07-20 16:57:30,604 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:57:30" (3/3) ... [2020-07-20 16:57:30,606 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o100.c [2020-07-20 16:57:30,618 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:57:30,626 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:57:30,643 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:57:30,671 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:57:30,671 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:57:30,671 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:57:30,672 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:57:30,672 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:57:30,672 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:57:30,672 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:57:30,673 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:57:30,694 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 16:57:30,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:57:30,701 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:30,702 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:30,702 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:30,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:30,710 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-20 16:57:30,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:30,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1722994946] [2020-07-20 16:57:30,721 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:30,819 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:57:30,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:30,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 16:57:30,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:30,927 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:57:30,927 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:57:30,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1722994946] [2020-07-20 16:57:30,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:57:30,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:57:30,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205776576] [2020-07-20 16:57:30,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:57:30,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:30,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:57:30,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:57:30,956 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 16:57:31,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:31,020 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-20 16:57:31,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:57:31,023 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:57:31,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:31,035 INFO L225 Difference]: With dead ends: 32 [2020-07-20 16:57:31,036 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 16:57:31,040 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:57:31,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 16:57:31,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 16:57:31,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 16:57:31,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 16:57:31,096 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 16:57:31,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:31,096 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 16:57:31,096 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:57:31,097 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 16:57:31,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 16:57:31,099 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:31,099 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:31,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:31,315 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:31,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:31,317 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-20 16:57:31,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:31,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [766719851] [2020-07-20 16:57:31,319 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:31,368 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:57:31,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:31,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 16:57:31,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:31,456 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 16:57:31,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:31,716 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 16:57:31,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [766719851] [2020-07-20 16:57:31,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:31,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 16:57:31,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220931452] [2020-07-20 16:57:31,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:57:31,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:31,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:57:31,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:57:31,722 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-20 16:57:31,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:31,818 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-20 16:57:31,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:57:31,819 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-20 16:57:31,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:31,820 INFO L225 Difference]: With dead ends: 30 [2020-07-20 16:57:31,820 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 16:57:31,822 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:57:31,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 16:57:31,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 16:57:31,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 16:57:31,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 16:57:31,829 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-20 16:57:31,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:31,830 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 16:57:31,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:57:31,830 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 16:57:31,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 16:57:31,831 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:31,832 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:32,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:32,036 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:32,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:32,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-20 16:57:32,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:32,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2139005165] [2020-07-20 16:57:32,039 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in