/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_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_2x3-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:29:25,100 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:29:25,103 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:29:25,122 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:29:25,123 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:29:25,124 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:29:25,126 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:29:25,128 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:29:25,130 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:29:25,131 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:29:25,132 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:29:25,134 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:29:25,134 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:29:25,135 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:29:25,137 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:29:25,138 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:29:25,140 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:29:25,141 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:29:25,144 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:29:25,146 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:29:25,149 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:29:25,151 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:29:25,152 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:29:25,153 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:29:25,157 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:29:25,168 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:29:25,169 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:29:25,170 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:29:25,171 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 [2020-07-21 13:29:25,203 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:29:25,204 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:29:25,207 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:29:25,208 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:29:25,208 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:29:25,208 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:29:25,208 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:29:25,209 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:29:25,209 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:29:25,209 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:29:25,210 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:29:25,211 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:29:25,211 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:29:25,212 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:29:25,212 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:29:25,212 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:29:25,212 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:29:25,213 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:29:25,213 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:29:25,213 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:29:25,214 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:29:25,214 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:29:25,214 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:29:25,215 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:29:25,215 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:29:25,215 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:29:25,215 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:29:25,215 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:29:25,215 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:29:25,216 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_FUNCTIONS 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 -> 2 [2020-07-21 13:29:25,615 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:29:25,644 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:29:25,649 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:29:25,652 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:29:25,652 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:29:25,653 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_2x3-2.c [2020-07-21 13:29:25,770 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/981050fd6/0505e748155a4612bea118d3e27ce10f/FLAGff5572928 [2020-07-21 13:29:26,342 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:29:26,343 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_2x3-2.c [2020-07-21 13:29:26,354 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/981050fd6/0505e748155a4612bea118d3e27ce10f/FLAGff5572928 [2020-07-21 13:29:26,715 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/981050fd6/0505e748155a4612bea118d3e27ce10f [2020-07-21 13:29:26,728 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:29:26,732 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:29:26,733 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:29:26,733 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:29:26,738 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:29:26,739 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:29:26" (1/1) ... [2020-07-21 13:29:26,743 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@36769e5b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:29:26, skipping insertion in model container [2020-07-21 13:29:26,744 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:29:26" (1/1) ... [2020-07-21 13:29:26,754 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:29:26,780 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:29:27,035 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:29:27,042 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:29:27,061 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:29:27,082 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:29:27,083 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:29:27 WrapperNode [2020-07-21 13:29:27,084 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:29:27,085 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:29:27,085 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:29:27,085 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:29:27,101 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:29:27" (1/1) ... [2020-07-21 13:29:27,102 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:29:27" (1/1) ... [2020-07-21 13:29:27,109 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:29:27" (1/1) ... [2020-07-21 13:29:27,110 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:29:27" (1/1) ... [2020-07-21 13:29:27,115 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:29:27" (1/1) ... [2020-07-21 13:29:27,118 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:29:27" (1/1) ... [2020-07-21 13:29:27,119 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:29:27" (1/1) ... [2020-07-21 13:29:27,121 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:29:27,121 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:29:27,122 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:29:27,122 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:29:27,124 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:29:27" (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 [2020-07-21 13:29:27,307 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:29:27,307 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:29:27,307 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-07-21 13:29:27,308 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:29:27,308 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:29:27,308 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-07-21 13:29:27,308 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:29:27,308 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:29:27,309 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:29:27,558 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:29:27,559 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 13:29:27,566 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:29:27 BoogieIcfgContainer [2020-07-21 13:29:27,566 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:29:27,568 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:29:27,568 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:29:27,573 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:29:27,573 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:29:26" (1/3) ... [2020-07-21 13:29:27,575 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3886aed1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:29:27, skipping insertion in model container [2020-07-21 13:29:27,575 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:29:27" (2/3) ... [2020-07-21 13:29:27,576 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3886aed1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:29:27, skipping insertion in model container [2020-07-21 13:29:27,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:29:27" (3/3) ... [2020-07-21 13:29:27,579 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_2x3-2.c [2020-07-21 13:29:27,596 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:29:27,607 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:29:27,643 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:29:27,709 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:29:27,709 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:29:27,709 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:29:27,710 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:29:27,710 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:29:27,710 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:29:27,710 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:29:27,711 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:29:27,761 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 13:29:27,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 13:29:27,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:29:27,784 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:29:27,785 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:29:27,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:29:27,794 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-07-21 13:29:27,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:29:27,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [188981206] [2020-07-21 13:29:27,808 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 13:29:27,974 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:29:27,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:29:27,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 27 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:29:27,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:29:28,173 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:29:28,174 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:29:28,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [188981206] [2020-07-21 13:29:28,180 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:29:28,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:29:28,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267494310] [2020-07-21 13:29:28,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:29:28,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:29:28,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:29:28,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:29:28,216 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 13:29:28,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:29:28,339 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-21 13:29:28,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:29:28,342 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 13:29:28,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:29:28,356 INFO L225 Difference]: With dead ends: 30 [2020-07-21 13:29:28,356 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 13:29:28,361 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 13:29:28,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 13:29:28,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 13:29:28,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 13:29:28,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 13:29:28,413 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 13:29:28,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:29:28,414 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 13:29:28,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:29:28,414 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 13:29:28,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 13:29:28,418 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:29:28,418 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:29:28,629 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:29:28,630 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:29:28,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:29:28,632 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-07-21 13:29:28,632 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:29:28,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1378101494] [2020-07-21 13:29:28,633 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 13:29:28,672 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:29:28,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:29:28,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:29:28,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:29:28,738 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 13:29:28,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:29:28,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:29:28,993 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 13:29:28,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1378101494] [2020-07-21 13:29:28,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:29:28,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 8 [2020-07-21 13:29:28,995 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276692751] [2020-07-21 13:29:28,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 13:29:28,999 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:29:29,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 13:29:29,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 13:29:29,000 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 8 states. [2020-07-21 13:29:29,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:29:29,086 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-21 13:29:29,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 13:29:29,087 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2020-07-21 13:29:29,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:29:29,089 INFO L225 Difference]: With dead ends: 25 [2020-07-21 13:29:29,089 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 13:29:29,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 5 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-21 13:29:29,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 13:29:29,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 13:29:29,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 13:29:29,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-21 13:29:29,101 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-21 13:29:29,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:29:29,102 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-21 13:29:29,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 13:29:29,103 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-21 13:29:29,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 13:29:29,104 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:29:29,105 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:29:29,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:29:29,321 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:29:29,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:29:29,321 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-07-21 13:29:29,322 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:29:29,323 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [148257121] [2020-07-21 13:29:29,323 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 13:29:29,373 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:29:29,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:29:29,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 13:29:29,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:29:29,604 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-21 13:29:29,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:29:30,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 13:29:30,211 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 13:29:30,213 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 13:29:30,215 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 13:29:30,220 INFO L501 QuantifierPusher]: Distributing 5 disjuncts over 2 conjuncts [2020-07-21 13:29:30,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:29:30,224 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 13:29:30,228 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 13:29:30,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:29:30,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:29:30,235 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 13:29:30,238 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 13:29:30,240 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 13:29:30,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 13:29:30,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:29:30,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 13:29:30,465 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 13:29:30,467 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 13:29:30,469 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 13:29:30,472 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 13:29:30,476 INFO L501 QuantifierPusher]: Distributing 7 disjuncts over 2 conjuncts [2020-07-21 13:29:30,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:29:30,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:29:30,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:29:30,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:29:30,493 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 13:29:30,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:29:30,498 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 13:29:30,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:29:30,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 13:29:30,632 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 13:29:30,633 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [148257121] [2020-07-21 13:29:30,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:29:30,634 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13] total 21 [2020-07-21 13:29:30,634 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775555120] [2020-07-21 13:29:30,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:29:30,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:29:30,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:29:30,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:29:30,637 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 21 states. [2020-07-21 13:29:30,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:29:30,921 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-21 13:29:30,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:29:30,922 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 25 [2020-07-21 13:29:30,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:29:30,923 INFO L225 Difference]: With dead ends: 28 [2020-07-21 13:29:30,924 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 13:29:30,925 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=135, Invalid=515, Unknown=0, NotChecked=0, Total=650 [2020-07-21 13:29:30,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 13:29:30,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 13:29:30,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 13:29:30,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 13:29:30,933 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-07-21 13:29:30,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:29:30,933 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 13:29:30,934 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:29:30,934 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 13:29:30,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 13:29:30,935 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:29:30,936 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:29:31,149 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:29:31,151 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:29:31,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:29:31,152 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2020-07-21 13:29:31,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:29:31,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [132651223] [2020-07-21 13:29:31,154 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:29:31,208 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:29:31,209 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:29:31,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:29:31,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:29:31,271 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-21 13:29:31,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:29:31,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:29:31,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:29:31,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:29:31,577 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 13:29:31,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [132651223] [2020-07-21 13:29:31,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:29:31,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 10 [2020-07-21 13:29:31,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365453628] [2020-07-21 13:29:31,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 13:29:31,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:29:31,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 13:29:31,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-07-21 13:29:31,581 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 10 states. [2020-07-21 13:29:31,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:29:31,643 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2020-07-21 13:29:31,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:29:31,646 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2020-07-21 13:29:31,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:29:31,647 INFO L225 Difference]: With dead ends: 24 [2020-07-21 13:29:31,647 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 13:29:31,648 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 49 SyntacticMatches, 7 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=100, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:29:31,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 13:29:31,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 13:29:31,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 13:29:31,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 13:29:31,650 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 31 [2020-07-21 13:29:31,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:29:31,650 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 13:29:31,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 13:29:31,651 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 13:29:31,651 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 13:29:31,860 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:29:31,866 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 13:29:31,963 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 13:29:31,964 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:29:31,964 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:29:31,964 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 13:29:31,964 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 13:29:31,965 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 13:29:31,965 INFO L268 CegarLoopResult]: For program point sumEXIT(lines 3 9) no Hoare annotation was computed. [2020-07-21 13:29:31,966 INFO L264 CegarLoopResult]: At program point L7(line 7) the Hoare annotation is: (and (= sum_~m |sum_#in~m|) (<= sum_~n |sum_#in~n|) (<= 1 |sum_#in~n|) (<= |sum_#in~n| sum_~n)) [2020-07-21 13:29:31,967 INFO L268 CegarLoopResult]: For program point L7-1(line 7) no Hoare annotation was computed. [2020-07-21 13:29:31,967 INFO L268 CegarLoopResult]: For program point L4(lines 4 8) no Hoare annotation was computed. [2020-07-21 13:29:31,967 INFO L268 CegarLoopResult]: For program point sumFINAL(lines 3 9) no Hoare annotation was computed. [2020-07-21 13:29:31,968 INFO L271 CegarLoopResult]: At program point sumENTRY(lines 3 9) the Hoare annotation is: true [2020-07-21 13:29:31,968 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 16) no Hoare annotation was computed. [2020-07-21 13:29:31,972 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 11 18) the Hoare annotation is: true [2020-07-21 13:29:31,973 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 11 18) no Hoare annotation was computed. [2020-07-21 13:29:31,973 INFO L268 CegarLoopResult]: For program point L16(line 16) no Hoare annotation was computed. [2020-07-21 13:29:31,973 INFO L268 CegarLoopResult]: For program point L15(lines 15 17) no Hoare annotation was computed. [2020-07-21 13:29:31,974 INFO L264 CegarLoopResult]: At program point L14(line 14) the Hoare annotation is: (and (<= 2 main_~a~0) (<= main_~a~0 2)) [2020-07-21 13:29:31,974 INFO L268 CegarLoopResult]: For program point L14-1(line 14) no Hoare annotation was computed. [2020-07-21 13:29:31,974 INFO L268 CegarLoopResult]: For program point L15-2(lines 11 18) no Hoare annotation was computed. [2020-07-21 13:29:31,981 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:29:31 BoogieIcfgContainer [2020-07-21 13:29:31,982 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 13:29:31,989 INFO L168 Benchmark]: Toolchain (without parser) took 5254.40 ms. Allocated memory was 137.4 MB in the beginning and 249.0 MB in the end (delta: 111.7 MB). Free memory was 102.1 MB in the beginning and 124.4 MB in the end (delta: -22.3 MB). Peak memory consumption was 89.3 MB. Max. memory is 7.1 GB. [2020-07-21 13:29:31,991 INFO L168 Benchmark]: CDTParser took 0.80 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 13:29:31,993 INFO L168 Benchmark]: CACSL2BoogieTranslator took 351.28 ms. Allocated memory is still 137.4 MB. Free memory was 101.6 MB in the beginning and 92.4 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-21 13:29:32,001 INFO L168 Benchmark]: Boogie Preprocessor took 36.10 ms. Allocated memory is still 137.4 MB. Free memory was 92.4 MB in the beginning and 91.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 13:29:32,003 INFO L168 Benchmark]: RCFGBuilder took 444.79 ms. Allocated memory was 137.4 MB in the beginning and 200.8 MB in the end (delta: 63.4 MB). Free memory was 91.1 MB in the beginning and 168.5 MB in the end (delta: -77.4 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-21 13:29:32,005 INFO L168 Benchmark]: TraceAbstraction took 4414.26 ms. Allocated memory was 200.8 MB in the beginning and 249.0 MB in the end (delta: 48.2 MB). Free memory was 168.5 MB in the beginning and 124.4 MB in the end (delta: 44.1 MB). Peak memory consumption was 92.4 MB. Max. memory is 7.1 GB. [2020-07-21 13:29:32,020 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.80 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 351.28 ms. Allocated memory is still 137.4 MB. Free memory was 101.6 MB in the beginning and 92.4 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 36.10 ms. Allocated memory is still 137.4 MB. Free memory was 92.4 MB in the beginning and 91.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 444.79 ms. Allocated memory was 137.4 MB in the beginning and 200.8 MB in the end (delta: 63.4 MB). Free memory was 91.1 MB in the beginning and 168.5 MB in the end (delta: -77.4 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4414.26 ms. Allocated memory was 200.8 MB in the beginning and 249.0 MB in the end (delta: 48.2 MB). Free memory was 168.5 MB in the beginning and 124.4 MB in the end (delta: 44.1 MB). Peak memory consumption was 92.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 16]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 4.1s, OverallIterations: 4, TraceHistogramMax: 4, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 52 SDtfs, 58 SDslu, 179 SDs, 0 SdLazy, 174 SolverSat, 27 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 173 GetRequests, 113 SyntacticMatches, 13 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=3, 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, 4 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 25 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 2.1s InterpolantComputationTime, 88 NumberOfCodeBlocks, 73 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 156 ConstructedInterpolants, 0 QuantifiedInterpolants, 17760 SizeOfPredicates, 19 NumberOfNonLiveVariables, 228 ConjunctsInSsa, 53 ConjunctsInUnsatCore, 7 InterpolantComputations, 1 PerfectInterpolantSequences, 59/96 InterpolantCoveringCapability, 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 RESULT: Ultimate proved your program to be correct! Received shutdown request...