/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 DAGSIZE --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/id2_i5_o5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:43:54,119 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:43:54,122 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:43:54,136 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:43:54,136 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:43:54,137 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:43:54,139 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:43:54,141 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:43:54,143 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:43:54,143 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:43:54,144 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:43:54,146 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:43:54,146 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:43:54,147 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:43:54,148 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:43:54,149 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:43:54,150 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:43:54,151 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:43:54,153 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:43:54,154 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:43:54,156 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:43:54,157 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:43:54,158 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:43:54,159 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:43:54,165 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:43:54,175 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:43:54,176 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:43:54,177 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:43:54,178 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 19:43:54,193 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:43:54,193 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:43:54,196 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:43:54,197 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:43:54,197 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:43:54,197 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:43:54,197 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:43:54,197 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:43:54,198 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:43:54,198 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:43:54,198 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:43:54,199 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:43:54,199 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:43:54,199 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:43:54,200 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:43:54,200 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:43:54,200 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:43:54,200 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:43:54,200 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:43:54,201 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:43:54,201 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:43:54,201 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:43:54,202 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:43:54,202 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:43:54,202 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:43:54,202 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:43:54,203 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:54,203 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:43:54,203 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:43:54,203 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 -> DAGSIZE 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 19:43:54,523 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:43:54,537 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:43:54,545 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:43:54,546 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:43:54,547 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:43:54,548 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-2.c [2020-07-21 19:43:54,615 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7824334e0/deaf9a1db30a44ea97c5097bf0ce8f90/FLAG12f654ae4 [2020-07-21 19:43:55,037 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:43:55,038 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_i5_o5-2.c [2020-07-21 19:43:55,045 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7824334e0/deaf9a1db30a44ea97c5097bf0ce8f90/FLAG12f654ae4 [2020-07-21 19:43:55,420 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7824334e0/deaf9a1db30a44ea97c5097bf0ce8f90 [2020-07-21 19:43:55,430 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:43:55,434 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:43:55,435 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:43:55,435 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:43:55,438 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:43:55,439 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:43:55" (1/1) ... [2020-07-21 19:43:55,442 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@16bce41b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:55, skipping insertion in model container [2020-07-21 19:43:55,443 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:43:55" (1/1) ... [2020-07-21 19:43:55,451 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:43:55,468 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:43:55,635 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:43:55,640 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:43:55,657 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:43:55,671 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:43:55,672 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:55 WrapperNode [2020-07-21 19:43:55,672 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:43:55,673 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:43:55,673 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:43:55,673 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:43:55,682 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:55" (1/1) ... [2020-07-21 19:43:55,683 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:55" (1/1) ... [2020-07-21 19:43:55,688 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:55" (1/1) ... [2020-07-21 19:43:55,688 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:55" (1/1) ... [2020-07-21 19:43:55,772 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:55" (1/1) ... [2020-07-21 19:43:55,774 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:55" (1/1) ... [2020-07-21 19:43:55,776 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:55" (1/1) ... [2020-07-21 19:43:55,777 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:43:55,778 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:43:55,778 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:43:55,778 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:43:55,779 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:55" (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 19:43:55,865 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:43:55,865 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:43:55,865 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 19:43:55,865 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-21 19:43:55,866 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:43:55,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:43:55,867 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:43:55,867 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 19:43:55,868 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-21 19:43:55,868 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:43:55,869 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:43:55,869 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:43:56,067 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:43:56,067 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 19:43:56,074 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:43:56 BoogieIcfgContainer [2020-07-21 19:43:56,075 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:43:56,077 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:43:56,078 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:43:56,081 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:43:56,082 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:43:55" (1/3) ... [2020-07-21 19:43:56,083 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@156df64e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:43:56, skipping insertion in model container [2020-07-21 19:43:56,083 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:55" (2/3) ... [2020-07-21 19:43:56,083 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@156df64e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:43:56, skipping insertion in model container [2020-07-21 19:43:56,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:43:56" (3/3) ... [2020-07-21 19:43:56,085 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-2.c [2020-07-21 19:43:56,098 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:43:56,112 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:43:56,127 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:43:56,158 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:43:56,160 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:43:56,160 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:43:56,162 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:43:56,162 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:43:56,162 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:43:56,162 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:43:56,162 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:43:56,183 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-07-21 19:43:56,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 19:43:56,190 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:56,192 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:56,192 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:56,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:56,199 INFO L82 PathProgramCache]: Analyzing trace with hash -550894517, now seen corresponding path program 1 times [2020-07-21 19:43:56,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:56,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126864165] [2020-07-21 19:43:56,207 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 19:43:56,279 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:43:56,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:56,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:43:56,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:56,404 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 19:43:56,405 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:43:56,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126864165] [2020-07-21 19:43:56,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:43:56,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:43:56,408 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457030117] [2020-07-21 19:43:56,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:43:56,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:56,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:43:56,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:43:56,438 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 5 states. [2020-07-21 19:43:56,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:56,520 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-07-21 19:43:56,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:43:56,523 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 19:43:56,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:56,533 INFO L225 Difference]: With dead ends: 36 [2020-07-21 19:43:56,534 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 19:43:56,537 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:43:56,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 19:43:56,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 19:43:56,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 19:43:56,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-07-21 19:43:56,577 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 13 [2020-07-21 19:43:56,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:56,578 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-07-21 19:43:56,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:43:56,578 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-07-21 19:43:56,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 19:43:56,581 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:56,581 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:56,788 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:56,789 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:56,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:56,790 INFO L82 PathProgramCache]: Analyzing trace with hash 40504409, now seen corresponding path program 1 times [2020-07-21 19:43:56,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:56,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176404837] [2020-07-21 19:43:56,792 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 19:43:56,823 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:43:56,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:56,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:43:56,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:56,927 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:43:56,928 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:43:56,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176404837] [2020-07-21 19:43:56,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:43:56,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-21 19:43:56,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275270354] [2020-07-21 19:43:56,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 19:43:56,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:56,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 19:43:56,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-21 19:43:56,933 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2020-07-21 19:43:57,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:57,015 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2020-07-21 19:43:57,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:43:57,016 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-07-21 19:43:57,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:57,018 INFO L225 Difference]: With dead ends: 33 [2020-07-21 19:43:57,018 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 19:43:57,019 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:43:57,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 19:43:57,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-07-21 19:43:57,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 19:43:57,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-07-21 19:43:57,028 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 19 [2020-07-21 19:43:57,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:57,029 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-07-21 19:43:57,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 19:43:57,029 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-07-21 19:43:57,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 19:43:57,030 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:57,031 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:57,244 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:57,245 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:57,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:57,246 INFO L82 PathProgramCache]: Analyzing trace with hash 1029702107, now seen corresponding path program 1 times [2020-07-21 19:43:57,246 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:57,246 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1141457494] [2020-07-21 19:43:57,247 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 19:43:57,279 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:57,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:57,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:43:57,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:57,354 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 19:43:57,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:57,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,777 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 19:43:57,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1141457494] [2020-07-21 19:43:57,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:57,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 19:43:57,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173519954] [2020-07-21 19:43:57,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 19:43:57,779 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:57,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 19:43:57,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 19:43:57,780 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 12 states. [2020-07-21 19:43:57,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:57,908 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2020-07-21 19:43:57,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:43:57,909 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2020-07-21 19:43:57,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:57,911 INFO L225 Difference]: With dead ends: 39 [2020-07-21 19:43:57,911 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 19:43:57,914 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:43:57,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 19:43:57,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2020-07-21 19:43:57,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 19:43:57,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-07-21 19:43:57,926 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2020-07-21 19:43:57,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:57,927 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-07-21 19:43:57,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 19:43:57,927 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-07-21 19:43:57,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 19:43:57,929 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:57,929 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:58,142 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:58,143 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:58,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:58,144 INFO L82 PathProgramCache]: Analyzing trace with hash -559715991, now seen corresponding path program 1 times [2020-07-21 19:43:58,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:58,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [825293962] [2020-07-21 19:43:58,146 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 19:43:58,182 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:58,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:58,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:43:58,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:58,251 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 19:43:58,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:58,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:58,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:58,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:58,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:58,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:58,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:58,820 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 19:43:58,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [825293962] [2020-07-21 19:43:58,821 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:58,821 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 19:43:58,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679316413] [2020-07-21 19:43:58,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 19:43:58,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:58,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 19:43:58,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:43:58,823 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 14 states. [2020-07-21 19:43:58,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:58,953 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2020-07-21 19:43:58,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:43:58,954 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 31 [2020-07-21 19:43:58,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:58,956 INFO L225 Difference]: With dead ends: 45 [2020-07-21 19:43:58,956 INFO L226 Difference]: Without dead ends: 41 [2020-07-21 19:43:58,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 41 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:43:58,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-07-21 19:43:58,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 33. [2020-07-21 19:43:58,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 19:43:58,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-07-21 19:43:58,964 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 31 [2020-07-21 19:43:58,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:58,965 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-07-21 19:43:58,965 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 19:43:58,965 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-07-21 19:43:58,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 19:43:58,966 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:58,967 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:59,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:59,168 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:59,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:59,169 INFO L82 PathProgramCache]: Analyzing trace with hash 2003326827, now seen corresponding path program 2 times [2020-07-21 19:43:59,170 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:59,171 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [647192688] [2020-07-21 19:43:59,171 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 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:59,209 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:59,209 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:59,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:43:59,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:59,296 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-21 19:43:59,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:59,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:59,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:00,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:00,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:00,127 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 19:44:00,127 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [647192688] [2020-07-21 19:44:00,128 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:00,128 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 19:44:00,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326285596] [2020-07-21 19:44:00,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:44:00,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:00,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:44:00,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:44:00,130 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 15 states. [2020-07-21 19:44:00,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:00,265 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-07-21 19:44:00,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:44:00,268 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-21 19:44:00,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:00,269 INFO L225 Difference]: With dead ends: 51 [2020-07-21 19:44:00,270 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 19:44:00,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 49 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:44:00,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 19:44:00,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 36. [2020-07-21 19:44:00,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 19:44:00,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-07-21 19:44:00,277 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 37 [2020-07-21 19:44:00,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:00,278 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-07-21 19:44:00,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:44:00,278 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-07-21 19:44:00,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 19:44:00,280 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:00,280 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:00,485 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:00,486 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:00,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:00,487 INFO L82 PathProgramCache]: Analyzing trace with hash 1197899385, now seen corresponding path program 2 times [2020-07-21 19:44:00,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:00,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [158401323] [2020-07-21 19:44:00,489 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 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:00,531 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:00,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:00,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 19:44:00,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:00,699 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 19:44:00,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:01,081 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 19:44:01,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [158401323] [2020-07-21 19:44:01,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:01,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2020-07-21 19:44:01,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696110353] [2020-07-21 19:44:01,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:44:01,083 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:01,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:44:01,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:44:01,083 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 15 states. [2020-07-21 19:44:01,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:01,177 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2020-07-21 19:44:01,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 19:44:01,178 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 43 [2020-07-21 19:44:01,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:01,179 INFO L225 Difference]: With dead ends: 57 [2020-07-21 19:44:01,180 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 19:44:01,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:44:01,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 19:44:01,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 39. [2020-07-21 19:44:01,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 19:44:01,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2020-07-21 19:44:01,188 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 43 [2020-07-21 19:44:01,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:01,188 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2020-07-21 19:44:01,188 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:44:01,188 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2020-07-21 19:44:01,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 19:44:01,190 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:01,190 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:01,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:01,406 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:01,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:01,406 INFO L82 PathProgramCache]: Analyzing trace with hash 706413819, now seen corresponding path program 3 times [2020-07-21 19:44:01,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:01,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1843585026] [2020-07-21 19:44:01,408 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 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:01,461 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:01,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:01,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:44:01,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:01,562 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 19:44:01,562 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:44:01,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1843585026] [2020-07-21 19:44:01,563 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:44:01,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-07-21 19:44:01,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213807195] [2020-07-21 19:44:01,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 19:44:01,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:01,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 19:44:01,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 19:44:01,565 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 12 states. [2020-07-21 19:44:01,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:01,716 INFO L93 Difference]: Finished difference Result 63 states and 65 transitions. [2020-07-21 19:44:01,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:44:01,718 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 49 [2020-07-21 19:44:01,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:01,719 INFO L225 Difference]: With dead ends: 63 [2020-07-21 19:44:01,720 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 19:44:01,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:44:01,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 19:44:01,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-21 19:44:01,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 19:44:01,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-21 19:44:01,732 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 49 [2020-07-21 19:44:01,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:01,732 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-21 19:44:01,732 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 19:44:01,733 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-21 19:44:01,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 19:44:01,734 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:01,734 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:01,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:01,949 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:01,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:01,950 INFO L82 PathProgramCache]: Analyzing trace with hash -1492956279, now seen corresponding path program 3 times [2020-07-21 19:44:01,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:01,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [60754611] [2020-07-21 19:44:01,951 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 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:01,997 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:01,997 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:01,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:44:02,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:02,122 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 33 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2020-07-21 19:44:02,122 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:44:02,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [60754611] [2020-07-21 19:44:02,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:44:02,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2020-07-21 19:44:02,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204186670] [2020-07-21 19:44:02,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:44:02,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:02,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:44:02,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:44:02,125 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2020-07-21 19:44:02,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:02,291 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2020-07-21 19:44:02,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:44:02,292 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 55 [2020-07-21 19:44:02,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:02,292 INFO L225 Difference]: With dead ends: 39 [2020-07-21 19:44:02,293 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 19:44:02,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:44:02,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 19:44:02,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 19:44:02,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 19:44:02,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 19:44:02,295 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 55 [2020-07-21 19:44:02,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:02,295 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 19:44:02,295 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:44:02,296 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 19:44:02,296 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 19:44:02,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:02,501 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 19:44:02,587 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 19:44:02,587 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:44:02,587 INFO L264 CegarLoopResult]: At program point L14(line 14) the Hoare annotation is: (and (<= |id2_#in~x| id2_~x) (<= id2_~x |id2_#in~x|)) [2020-07-21 19:44:02,587 INFO L268 CegarLoopResult]: For program point L13(line 13) no Hoare annotation was computed. [2020-07-21 19:44:02,588 INFO L268 CegarLoopResult]: For program point L14-1(line 14) no Hoare annotation was computed. [2020-07-21 19:44:02,588 INFO L268 CegarLoopResult]: For program point id2EXIT(lines 12 15) no Hoare annotation was computed. [2020-07-21 19:44:02,588 INFO L271 CegarLoopResult]: At program point id2ENTRY(lines 12 15) the Hoare annotation is: true [2020-07-21 19:44:02,588 INFO L268 CegarLoopResult]: For program point id2FINAL(lines 12 15) no Hoare annotation was computed. [2020-07-21 19:44:02,591 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:44:02,591 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 19:44:02,591 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 19:44:02,591 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 19:44:02,591 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 21) no Hoare annotation was computed. [2020-07-21 19:44:02,592 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 17 23) the Hoare annotation is: true [2020-07-21 19:44:02,592 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 17 23) no Hoare annotation was computed. [2020-07-21 19:44:02,592 INFO L268 CegarLoopResult]: For program point L21(line 21) no Hoare annotation was computed. [2020-07-21 19:44:02,592 INFO L268 CegarLoopResult]: For program point L20(lines 20 22) no Hoare annotation was computed. [2020-07-21 19:44:02,592 INFO L264 CegarLoopResult]: At program point L19(line 19) the Hoare annotation is: (and (<= main_~input~0 5) (<= 5 main_~input~0)) [2020-07-21 19:44:02,592 INFO L268 CegarLoopResult]: For program point L19-1(line 19) no Hoare annotation was computed. [2020-07-21 19:44:02,592 INFO L268 CegarLoopResult]: For program point L20-2(lines 17 23) no Hoare annotation was computed. [2020-07-21 19:44:02,592 INFO L268 CegarLoopResult]: For program point idFINAL(lines 7 10) no Hoare annotation was computed. [2020-07-21 19:44:02,593 INFO L268 CegarLoopResult]: For program point idEXIT(lines 7 10) no Hoare annotation was computed. [2020-07-21 19:44:02,593 INFO L264 CegarLoopResult]: At program point L9(line 9) the Hoare annotation is: (and (<= |id_#in~x| id_~x) (<= id_~x |id_#in~x|)) [2020-07-21 19:44:02,593 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-07-21 19:44:02,593 INFO L268 CegarLoopResult]: For program point L9-1(line 9) no Hoare annotation was computed. [2020-07-21 19:44:02,594 INFO L271 CegarLoopResult]: At program point idENTRY(lines 7 10) the Hoare annotation is: true [2020-07-21 19:44:02,602 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 07:44:02 BoogieIcfgContainer [2020-07-21 19:44:02,602 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 19:44:02,606 INFO L168 Benchmark]: Toolchain (without parser) took 7172.43 ms. Allocated memory was 137.4 MB in the beginning and 281.5 MB in the end (delta: 144.2 MB). Free memory was 102.4 MB in the beginning and 106.0 MB in the end (delta: -3.5 MB). Peak memory consumption was 140.7 MB. Max. memory is 7.1 GB. [2020-07-21 19:44:02,612 INFO L168 Benchmark]: CDTParser took 0.32 ms. Allocated memory is still 137.4 MB. Free memory was 120.5 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 19:44:02,613 INFO L168 Benchmark]: CACSL2BoogieTranslator took 237.62 ms. Allocated memory is still 137.4 MB. Free memory was 102.0 MB in the beginning and 92.6 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-07-21 19:44:02,615 INFO L168 Benchmark]: Boogie Preprocessor took 104.77 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 92.6 MB in the beginning and 180.5 MB in the end (delta: -87.9 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-07-21 19:44:02,616 INFO L168 Benchmark]: RCFGBuilder took 297.54 ms. Allocated memory is still 201.3 MB. Free memory was 180.5 MB in the beginning and 168.3 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2020-07-21 19:44:02,617 INFO L168 Benchmark]: TraceAbstraction took 6524.74 ms. Allocated memory was 201.3 MB in the beginning and 281.5 MB in the end (delta: 80.2 MB). Free memory was 167.6 MB in the beginning and 106.0 MB in the end (delta: 61.7 MB). Peak memory consumption was 141.9 MB. Max. memory is 7.1 GB. [2020-07-21 19:44:02,631 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32 ms. Allocated memory is still 137.4 MB. Free memory was 120.5 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 237.62 ms. Allocated memory is still 137.4 MB. Free memory was 102.0 MB in the beginning and 92.6 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 104.77 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 92.6 MB in the beginning and 180.5 MB in the end (delta: -87.9 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 297.54 ms. Allocated memory is still 201.3 MB. Free memory was 180.5 MB in the beginning and 168.3 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6524.74 ms. Allocated memory was 201.3 MB in the beginning and 281.5 MB in the end (delta: 80.2 MB). Free memory was 167.6 MB in the beginning and 106.0 MB in the end (delta: 61.7 MB). Peak memory consumption was 141.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 21]: 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 5 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 6.3s, OverallIterations: 8, TraceHistogramMax: 4, AutomataDifference: 1.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 179 SDtfs, 130 SDslu, 1108 SDs, 0 SdLazy, 510 SolverSat, 28 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 430 GetRequests, 296 SyntacticMatches, 27 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=39occurred in iteration=6, 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, 40 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 11 PreInvPairs, 11 NumberOfFragments, 27 HoareAnnotationTreeSize, 11 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 3.0s InterpolantComputationTime, 272 NumberOfCodeBlocks, 257 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 396 ConstructedInterpolants, 0 QuantifiedInterpolants, 35544 SizeOfPredicates, 37 NumberOfNonLiveVariables, 615 ConjunctsInSsa, 101 ConjunctsInUnsatCore, 12 InterpolantComputations, 4 PerfectInterpolantSequences, 170/246 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...