/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 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:34:53,124 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:34:53,127 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:34:53,142 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:34:53,142 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:34:53,144 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:34:53,145 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:34:53,147 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:34:53,149 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:34:53,150 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:34:53,151 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:34:53,152 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:34:53,152 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:34:53,153 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:34:53,154 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:34:53,155 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:34:53,156 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:34:53,157 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:34:53,159 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:34:53,161 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:34:53,162 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:34:53,164 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:34:53,165 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:34:53,166 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:34:53,168 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:34:53,176 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:34:53,177 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:34:53,178 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:34:53,179 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:34:53,193 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:34:53,194 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:34:53,195 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:34:53,195 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:34:53,196 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:34:53,196 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:34:53,196 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:34:53,196 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:34:53,196 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:34:53,197 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:34:53,197 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:34:53,197 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:34:53,197 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:34:53,197 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:34:53,198 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:34:53,198 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:34:53,198 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:34:53,198 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:34:53,199 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:34:53,199 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:34:53,199 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:34:53,199 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:34:53,199 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:34:53,200 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:34:53,200 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:34:53,200 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:34:53,200 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:53,200 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:34:53,201 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:34:53,201 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 -> 4 [2020-07-20 13:34:53,532 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:34:53,547 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:34:53,551 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:34:53,552 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:34:53,553 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:34:53,554 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_5-1.c [2020-07-20 13:34:53,641 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ded577197/55ea6f2844e34e4a81d410c5380dc91e/FLAG69c4bc5c8 [2020-07-20 13:34:54,103 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:34:54,104 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_5-1.c [2020-07-20 13:34:54,112 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ded577197/55ea6f2844e34e4a81d410c5380dc91e/FLAG69c4bc5c8 [2020-07-20 13:34:54,456 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ded577197/55ea6f2844e34e4a81d410c5380dc91e [2020-07-20 13:34:54,470 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:34:54,474 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:34:54,477 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:34:54,477 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:34:54,481 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:34:54,483 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,487 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18abd7bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54, skipping insertion in model container [2020-07-20 13:34:54,487 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,501 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:34:54,520 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:34:54,690 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:34:54,694 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:34:54,710 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:34:54,726 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:34:54,727 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54 WrapperNode [2020-07-20 13:34:54,727 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:34:54,728 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:34:54,728 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:34:54,728 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:34:54,742 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,742 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,747 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,747 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,750 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,752 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,753 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,755 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:34:54,755 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:34:54,756 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:34:54,756 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:34:54,757 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:34:54,918 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:34:54,919 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:34:54,919 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 13:34:54,919 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:34:54,919 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:34:54,919 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:34:54,919 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 13:34:54,920 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:34:54,920 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:34:54,920 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:34:55,106 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:34:55,106 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:34:55,112 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:34:55 BoogieIcfgContainer [2020-07-20 13:34:55,112 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:34:55,113 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:34:55,114 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:34:55,117 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:34:55,118 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:34:54" (1/3) ... [2020-07-20 13:34:55,119 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d3c2b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:34:55, skipping insertion in model container [2020-07-20 13:34:55,119 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (2/3) ... [2020-07-20 13:34:55,119 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d3c2b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:34:55, skipping insertion in model container [2020-07-20 13:34:55,120 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:34:55" (3/3) ... [2020-07-20 13:34:55,122 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_5-1.c [2020-07-20 13:34:55,137 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:34:55,147 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:34:55,171 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:34:55,206 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:34:55,206 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:34:55,207 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:34:55,207 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:34:55,207 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:34:55,207 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:34:55,207 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:34:55,208 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:34:55,233 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 13:34:55,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:34:55,243 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:55,245 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:55,246 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:55,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:55,254 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 13:34:55,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:55,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2101500032] [2020-07-20 13:34:55,268 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:55,354 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:55,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:55,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:34:55,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:55,464 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:34:55,464 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:34:55,466 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2101500032] [2020-07-20 13:34:55,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:34:55,467 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:34:55,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325593965] [2020-07-20 13:34:55,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:34:55,474 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:55,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:34:55,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:34:55,493 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 13:34:55,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:55,599 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 13:34:55,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:34:55,602 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:34:55,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:55,613 INFO L225 Difference]: With dead ends: 35 [2020-07-20 13:34:55,614 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 13:34:55,617 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 [2020-07-20 13:34:55,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 13:34:55,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 13:34:55,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:34:55,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 13:34:55,670 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 13:34:55,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:55,671 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 13:34:55,671 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:34:55,671 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 13:34:55,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 13:34:55,674 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:55,674 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:55,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:55,889 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:55,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:55,890 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 13:34:55,891 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:55,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [876456776] [2020-07-20 13:34:55,892 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:55,927 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:55,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:55,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:34:55,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:55,967 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:34:55,969 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:34:55,969 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [876456776] [2020-07-20 13:34:55,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:34:55,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:34:55,971 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060372333] [2020-07-20 13:34:55,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:34:55,973 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:55,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:34:55,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:34:55,975 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 13:34:56,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:56,039 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 13:34:56,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:34:56,040 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 13:34:56,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:56,042 INFO L225 Difference]: With dead ends: 27 [2020-07-20 13:34:56,042 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 13:34:56,044 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:34:56,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 13:34:56,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 13:34:56,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:34:56,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 13:34:56,053 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 13:34:56,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:56,053 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 13:34:56,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:34:56,054 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 13:34:56,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:34:56,055 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:56,056 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:56,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:56,273 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:56,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:56,274 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 13:34:56,275 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:56,276 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1866807574] [2020-07-20 13:34:56,277 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:56,322 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:56,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:56,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:34:56,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:56,367 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:34:56,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:56,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,601 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:34:56,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1866807574] [2020-07-20 13:34:56,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:56,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 13:34:56,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334436594] [2020-07-20 13:34:56,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 13:34:56,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:56,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 13:34:56,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:34:56,605 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 13:34:56,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:56,709 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 13:34:56,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:34:56,710 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 13:34:56,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:56,713 INFO L225 Difference]: With dead ends: 32 [2020-07-20 13:34:56,713 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 13:34:56,714 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:34:56,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 13:34:56,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 13:34:56,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 13:34:56,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 13:34:56,724 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 13:34:56,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:56,725 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 13:34:56,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 13:34:56,725 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 13:34:56,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:34:56,727 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:56,727 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:56,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:56,955 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:56,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:56,956 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 13:34:56,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:56,957 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [831464575] [2020-07-20 13:34:56,957 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:34:56,985 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:56,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:56,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:34:56,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:57,044 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 13:34:57,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:57,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,238 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:34:57,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [831464575] [2020-07-20 13:34:57,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:57,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 13:34:57,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915598073] [2020-07-20 13:34:57,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 13:34:57,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:57,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 13:34:57,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:34:57,241 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 13:34:57,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:57,324 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 13:34:57,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:34:57,325 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 13:34:57,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:57,327 INFO L225 Difference]: With dead ends: 37 [2020-07-20 13:34:57,328 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 13:34:57,329 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:34:57,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 13:34:57,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 13:34:57,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 13:34:57,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 13:34:57,338 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 13:34:57,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:57,338 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 13:34:57,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 13:34:57,339 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 13:34:57,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 13:34:57,340 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:57,341 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:57,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:57,554 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:57,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:57,555 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 13:34:57,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:57,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [460407252] [2020-07-20 13:34:57,555 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:34:57,598 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:57,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:57,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:34:57,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:57,655 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 13:34:57,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:57,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,033 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 13:34:58,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [460407252] [2020-07-20 13:34:58,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:58,034 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 13:34:58,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180592234] [2020-07-20 13:34:58,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:34:58,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:58,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:34:58,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:34:58,037 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 13:34:58,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:58,212 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 13:34:58,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:34:58,214 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 13:34:58,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:58,216 INFO L225 Difference]: With dead ends: 42 [2020-07-20 13:34:58,216 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 13:34:58,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:34:58,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 13:34:58,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 13:34:58,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 13:34:58,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 13:34:58,229 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 13:34:58,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:58,240 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 13:34:58,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:34:58,243 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 13:34:58,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 13:34:58,245 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:58,245 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:58,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:58,449 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:58,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:58,449 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 13:34:58,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:58,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1192822010] [2020-07-20 13:34:58,451 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:34:58,498 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:58,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:58,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:34:58,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:58,554 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 13:34:58,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:58,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,890 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 13:34:58,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1192822010] [2020-07-20 13:34:58,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:58,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 13:34:58,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167051996] [2020-07-20 13:34:58,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:34:58,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:58,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:34:58,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:34:58,894 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 13:34:59,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:59,043 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 13:34:59,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:34:59,045 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 13:34:59,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:59,051 INFO L225 Difference]: With dead ends: 47 [2020-07-20 13:34:59,051 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 13:34:59,052 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:34:59,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 13:34:59,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 13:34:59,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 13:34:59,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 13:34:59,076 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 13:34:59,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:59,077 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 13:34:59,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:34:59,078 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 13:34:59,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 13:34:59,086 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:59,086 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:59,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:59,288 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:59,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:59,289 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 13:34:59,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:59,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1361129700] [2020-07-20 13:34:59,290 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:34:59,349 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:59,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:59,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:34:59,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:59,410 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 13:34:59,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:59,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:59,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:59,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:00,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:00,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:00,086 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 13:35:00,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1361129700] [2020-07-20 13:35:00,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:00,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 13:35:00,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203826017] [2020-07-20 13:35:00,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:35:00,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:00,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:35:00,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:35:00,091 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 13:35:00,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:00,271 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 13:35:00,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:35:00,271 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 13:35:00,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:00,274 INFO L225 Difference]: With dead ends: 52 [2020-07-20 13:35:00,274 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 13:35:00,275 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:00,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 13:35:00,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 13:35:00,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:35:00,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 13:35:00,287 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 13:35:00,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:00,288 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 13:35:00,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:35:00,288 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 13:35:00,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 13:35:00,290 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:00,291 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:00,503 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:00,504 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:00,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:00,505 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 13:35:00,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:00,506 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [150239184] [2020-07-20 13:35:00,507 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:35:00,572 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:00,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:00,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:35:00,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:00,663 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 13:35:00,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:01,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:01,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:01,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:01,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:01,292 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 13:35:01,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [150239184] [2020-07-20 13:35:01,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:01,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 12 [2020-07-20 13:35:01,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746596141] [2020-07-20 13:35:01,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:35:01,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:01,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:35:01,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:35:01,302 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 12 states. [2020-07-20 13:35:01,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:01,429 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 13:35:01,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:35:01,431 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 96 [2020-07-20 13:35:01,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:01,435 INFO L225 Difference]: With dead ends: 57 [2020-07-20 13:35:01,436 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 13:35:01,437 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 9 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2020-07-20 13:35:01,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 13:35:01,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 13:35:01,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:35:01,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 13:35:01,450 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 13:35:01,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:01,451 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 13:35:01,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:35:01,451 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 13:35:01,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 13:35:01,454 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:01,454 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:01,667 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:01,668 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:01,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:01,669 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 13:35:01,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:01,671 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1300563476] [2020-07-20 13:35:01,671 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:01,741 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:01,742 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:01,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:35:01,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:01,824 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 13:35:01,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:02,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,898 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 13:35:02,899 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1300563476] [2020-07-20 13:35:02,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:02,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-20 13:35:02,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735710296] [2020-07-20 13:35:02,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:35:02,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:02,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:35:02,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:35:02,902 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 14 states. [2020-07-20 13:35:03,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:03,102 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 13:35:03,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:03,103 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 117 [2020-07-20 13:35:03,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:03,105 INFO L225 Difference]: With dead ends: 62 [2020-07-20 13:35:03,105 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 13:35:03,107 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:35:03,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 13:35:03,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 13:35:03,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 13:35:03,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 13:35:03,120 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 13:35:03,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:03,121 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 13:35:03,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:35:03,121 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 13:35:03,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 13:35:03,124 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:03,125 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:03,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:03,339 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:03,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:03,340 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 13:35:03,341 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:03,341 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1804261893] [2020-07-20 13:35:03,342 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:03,433 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:03,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:03,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:35:03,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:03,536 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 221 proven. 407 refuted. 0 times theorem prover too weak. 1298 trivial. 0 not checked. [2020-07-20 13:35:03,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:04,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 223 proven. 427 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2020-07-20 13:35:04,698 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1804261893] [2020-07-20 13:35:04,699 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:04,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-20 13:35:04,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091718663] [2020-07-20 13:35:04,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:35:04,700 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:04,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:35:04,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:35:04,701 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 14 states. [2020-07-20 13:35:04,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:04,941 INFO L93 Difference]: Finished difference Result 88 states and 260 transitions. [2020-07-20 13:35:04,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:04,942 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 190 [2020-07-20 13:35:04,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:04,944 INFO L225 Difference]: With dead ends: 88 [2020-07-20 13:35:04,944 INFO L226 Difference]: Without dead ends: 49 [2020-07-20 13:35:04,956 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:35:04,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-20 13:35:04,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-07-20 13:35:04,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-20 13:35:04,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 70 transitions. [2020-07-20 13:35:04,985 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 70 transitions. Word has length 190 [2020-07-20 13:35:04,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:04,985 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 70 transitions. [2020-07-20 13:35:04,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:35:04,986 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 70 transitions. [2020-07-20 13:35:04,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-20 13:35:04,994 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:04,995 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 15, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:05,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:05,196 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:05,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:05,196 INFO L82 PathProgramCache]: Analyzing trace with hash -1040445716, now seen corresponding path program 5 times [2020-07-20 13:35:05,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:05,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1380778031] [2020-07-20 13:35:05,198 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:05,283 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:05,283 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:05,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:35:05,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:05,361 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 104 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2020-07-20 13:35:05,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:05,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,399 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 130 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2020-07-20 13:35:06,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1380778031] [2020-07-20 13:35:06,400 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:06,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-20 13:35:06,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380245065] [2020-07-20 13:35:06,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:35:06,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:06,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:35:06,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:35:06,403 INFO L87 Difference]: Start difference. First operand 49 states and 70 transitions. Second operand 14 states. [2020-07-20 13:35:06,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:06,587 INFO L93 Difference]: Finished difference Result 67 states and 91 transitions. [2020-07-20 13:35:06,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:06,589 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 136 [2020-07-20 13:35:06,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:06,591 INFO L225 Difference]: With dead ends: 67 [2020-07-20 13:35:06,591 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 13:35:06,593 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 248 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:35:06,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 13:35:06,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2020-07-20 13:35:06,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-20 13:35:06,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 77 transitions. [2020-07-20 13:35:06,603 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 77 transitions. Word has length 136 [2020-07-20 13:35:06,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:06,604 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 77 transitions. [2020-07-20 13:35:06,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:35:06,604 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 77 transitions. [2020-07-20 13:35:06,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 13:35:06,607 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:06,607 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:06,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:06,821 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:06,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:06,822 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 6 times [2020-07-20 13:35:06,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:06,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [937101556] [2020-07-20 13:35:06,823 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:06,953 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:06,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:06,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-20 13:35:06,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:07,124 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2020-07-20 13:35:07,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:08,015 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2020-07-20 13:35:08,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [937101556] [2020-07-20 13:35:08,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:08,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 20 [2020-07-20 13:35:08,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319589886] [2020-07-20 13:35:08,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 13:35:08,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:08,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 13:35:08,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=335, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:35:08,018 INFO L87 Difference]: Start difference. First operand 54 states and 77 transitions. Second operand 20 states. [2020-07-20 13:35:08,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:08,331 INFO L93 Difference]: Finished difference Result 112 states and 191 transitions. [2020-07-20 13:35:08,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 13:35:08,335 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 109 [2020-07-20 13:35:08,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:08,340 INFO L225 Difference]: With dead ends: 112 [2020-07-20 13:35:08,340 INFO L226 Difference]: Without dead ends: 105 [2020-07-20 13:35:08,342 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 195 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=409, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:35:08,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-07-20 13:35:08,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 81. [2020-07-20 13:35:08,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-20 13:35:08,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 145 transitions. [2020-07-20 13:35:08,387 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 145 transitions. Word has length 109 [2020-07-20 13:35:08,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:08,388 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 145 transitions. [2020-07-20 13:35:08,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 13:35:08,388 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 145 transitions. [2020-07-20 13:35:08,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 13:35:08,393 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:08,393 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:08,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:08,608 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:08,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:08,609 INFO L82 PathProgramCache]: Analyzing trace with hash 1883621107, now seen corresponding path program 7 times [2020-07-20 13:35:08,609 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:08,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [136371863] [2020-07-20 13:35:08,609 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:08,709 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:08,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:08,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 13:35:08,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:08,778 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 184 proven. 46 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2020-07-20 13:35:08,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:09,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:09,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:09,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:09,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:09,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:09,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:09,258 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 182 proven. 55 refuted. 0 times theorem prover too weak. 485 trivial. 0 not checked. [2020-07-20 13:35:09,259 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [136371863] [2020-07-20 13:35:09,259 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:09,259 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 12 [2020-07-20 13:35:09,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663955945] [2020-07-20 13:35:09,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:35:09,260 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:09,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:35:09,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:35:09,261 INFO L87 Difference]: Start difference. First operand 81 states and 145 transitions. Second operand 12 states. [2020-07-20 13:35:09,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:09,375 INFO L93 Difference]: Finished difference Result 111 states and 196 transitions. [2020-07-20 13:35:09,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:35:09,376 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 121 [2020-07-20 13:35:09,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:09,379 INFO L225 Difference]: With dead ends: 111 [2020-07-20 13:35:09,380 INFO L226 Difference]: Without dead ends: 104 [2020-07-20 13:35:09,382 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 224 SyntacticMatches, 7 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:35:09,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-07-20 13:35:09,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 81. [2020-07-20 13:35:09,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-20 13:35:09,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 145 transitions. [2020-07-20 13:35:09,414 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 145 transitions. Word has length 121 [2020-07-20 13:35:09,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:09,418 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 145 transitions. [2020-07-20 13:35:09,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:35:09,418 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 145 transitions. [2020-07-20 13:35:09,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 13:35:09,423 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:09,424 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:09,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:09,638 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:09,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:09,638 INFO L82 PathProgramCache]: Analyzing trace with hash -1349477645, now seen corresponding path program 8 times [2020-07-20 13:35:09,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:09,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1013823481] [2020-07-20 13:35:09,639 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:09,726 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:35:09,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:09,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 13:35:09,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:09,798 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 233 proven. 55 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-20 13:35:09,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:10,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:10,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:10,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:10,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:10,567 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 230 proven. 70 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-20 13:35:10,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1013823481] [2020-07-20 13:35:10,568 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:10,568 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-20 13:35:10,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441159893] [2020-07-20 13:35:10,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:35:10,569 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:10,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:35:10,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:35:10,570 INFO L87 Difference]: Start difference. First operand 81 states and 145 transitions. Second operand 14 states. [2020-07-20 13:35:10,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:10,744 INFO L93 Difference]: Finished difference Result 97 states and 160 transitions. [2020-07-20 13:35:10,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:10,744 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-20 13:35:10,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:10,747 INFO L225 Difference]: With dead ends: 97 [2020-07-20 13:35:10,747 INFO L226 Difference]: Without dead ends: 90 [2020-07-20 13:35:10,749 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:35:10,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-20 13:35:10,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 71. [2020-07-20 13:35:10,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 13:35:10,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 123 transitions. [2020-07-20 13:35:10,759 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 123 transitions. Word has length 121 [2020-07-20 13:35:10,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:10,760 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 123 transitions. [2020-07-20 13:35:10,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:35:10,760 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 123 transitions. [2020-07-20 13:35:10,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 13:35:10,763 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:10,763 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:10,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:10,978 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:10,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:10,978 INFO L82 PathProgramCache]: Analyzing trace with hash -280177283, now seen corresponding path program 9 times [2020-07-20 13:35:10,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:10,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [230238655] [2020-07-20 13:35:10,980 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:11,067 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:11,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:11,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 13:35:11,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:11,132 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 147 proven. 141 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-20 13:35:11,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:11,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,999 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 146 proven. 154 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-20 13:35:12,000 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [230238655] [2020-07-20 13:35:12,000 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:12,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-20 13:35:12,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400006182] [2020-07-20 13:35:12,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:35:12,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:12,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:35:12,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:35:12,003 INFO L87 Difference]: Start difference. First operand 71 states and 123 transitions. Second operand 14 states. [2020-07-20 13:35:12,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:12,183 INFO L93 Difference]: Finished difference Result 107 states and 179 transitions. [2020-07-20 13:35:12,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:12,186 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-20 13:35:12,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:12,189 INFO L225 Difference]: With dead ends: 107 [2020-07-20 13:35:12,190 INFO L226 Difference]: Without dead ends: 71 [2020-07-20 13:35:12,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:35:12,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-20 13:35:12,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2020-07-20 13:35:12,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 13:35:12,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 95 transitions. [2020-07-20 13:35:12,211 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 95 transitions. Word has length 121 [2020-07-20 13:35:12,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:12,211 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 95 transitions. [2020-07-20 13:35:12,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:35:12,213 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 95 transitions. [2020-07-20 13:35:12,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-07-20 13:35:12,217 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:12,217 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 13, 7, 7, 7, 7, 7, 7, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:12,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:12,431 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:12,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:12,431 INFO L82 PathProgramCache]: Analyzing trace with hash -1402909364, now seen corresponding path program 10 times [2020-07-20 13:35:12,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:12,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [249457967] [2020-07-20 13:35:12,432 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:12,523 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:12,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:12,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:35:12,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:12,597 INFO L134 CoverageAnalysis]: Checked inductivity of 582 backedges. 78 proven. 198 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2020-07-20 13:35:12,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:13,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:13,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:13,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:13,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:13,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:13,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:13,516 INFO L134 CoverageAnalysis]: Checked inductivity of 582 backedges. 84 proven. 218 refuted. 0 times theorem prover too weak. 280 trivial. 0 not checked. [2020-07-20 13:35:13,525 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [249457967] [2020-07-20 13:35:13,525 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:13,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-20 13:35:13,526 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520474144] [2020-07-20 13:35:13,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:35:13,529 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:13,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:35:13,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:35:13,531 INFO L87 Difference]: Start difference. First operand 61 states and 95 transitions. Second operand 14 states. [2020-07-20 13:35:13,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:13,737 INFO L93 Difference]: Finished difference Result 109 states and 171 transitions. [2020-07-20 13:35:13,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:13,738 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 110 [2020-07-20 13:35:13,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:13,739 INFO L225 Difference]: With dead ends: 109 [2020-07-20 13:35:13,739 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 13:35:13,741 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 196 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:35:13,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 13:35:13,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-07-20 13:35:13,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-20 13:35:13,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2020-07-20 13:35:13,747 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 110 [2020-07-20 13:35:13,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:13,748 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2020-07-20 13:35:13,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:35:13,748 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2020-07-20 13:35:13,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 13:35:13,750 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:13,750 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:13,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:13,966 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:13,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:13,967 INFO L82 PathProgramCache]: Analyzing trace with hash 1072341053, now seen corresponding path program 11 times [2020-07-20 13:35:13,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:13,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1275590004] [2020-07-20 13:35:13,968 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:14,056 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:14,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:14,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 13:35:14,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:14,124 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 113 proven. 175 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-20 13:35:14,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:14,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,882 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 114 proven. 186 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-20 13:35:14,886 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1275590004] [2020-07-20 13:35:14,890 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:14,890 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-20 13:35:14,890 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269344318] [2020-07-20 13:35:14,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:35:14,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:14,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:35:14,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:35:14,892 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand 14 states. [2020-07-20 13:35:15,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:15,019 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2020-07-20 13:35:15,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:15,020 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-20 13:35:15,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:15,022 INFO L225 Difference]: With dead ends: 75 [2020-07-20 13:35:15,022 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 13:35:15,023 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:35:15,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 13:35:15,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-07-20 13:35:15,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 13:35:15,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 61 transitions. [2020-07-20 13:35:15,029 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 61 transitions. Word has length 121 [2020-07-20 13:35:15,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:15,030 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 61 transitions. [2020-07-20 13:35:15,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:35:15,030 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 61 transitions. [2020-07-20 13:35:15,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 13:35:15,032 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:15,032 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:15,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:15,246 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:15,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:15,247 INFO L82 PathProgramCache]: Analyzing trace with hash -419017667, now seen corresponding path program 12 times [2020-07-20 13:35:15,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:15,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1202396536] [2020-07-20 13:35:15,248 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:15,349 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:15,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:15,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 13:35:15,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:15,432 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 116 proven. 217 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2020-07-20 13:35:15,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:16,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:16,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:16,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:16,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:16,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:16,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:16,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:16,673 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 112 proven. 243 refuted. 0 times theorem prover too weak. 367 trivial. 0 not checked. [2020-07-20 13:35:16,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1202396536] [2020-07-20 13:35:16,674 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:16,674 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 16 [2020-07-20 13:35:16,674 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754220820] [2020-07-20 13:35:16,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 13:35:16,675 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:16,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 13:35:16,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-20 13:35:16,676 INFO L87 Difference]: Start difference. First operand 53 states and 61 transitions. Second operand 16 states. [2020-07-20 13:35:16,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:16,886 INFO L93 Difference]: Finished difference Result 77 states and 90 transitions. [2020-07-20 13:35:16,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:35:16,887 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 121 [2020-07-20 13:35:16,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:16,888 INFO L225 Difference]: With dead ends: 77 [2020-07-20 13:35:16,888 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 13:35:16,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 216 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:35:16,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 13:35:16,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 13:35:16,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 13:35:16,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 13:35:16,892 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 121 [2020-07-20 13:35:16,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:16,893 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 13:35:16,893 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 13:35:16,893 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 13:35:16,893 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 13:35:17,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:17,104 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 13:35:17,436 WARN L193 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 38 [2020-07-20 13:35:17,615 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 35 [2020-07-20 13:35:17,787 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-20 13:35:17,969 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-20 13:35:18,127 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 129 DAG size of output: 35 [2020-07-20 13:35:18,449 WARN L193 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 144 DAG size of output: 72 [2020-07-20 13:35:18,594 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 128 DAG size of output: 43 [2020-07-20 13:35:18,733 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-20 13:35:18,864 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-20 13:35:19,041 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 129 DAG size of output: 35 [2020-07-20 13:35:19,346 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-20 13:35:19,461 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-20 13:35:19,567 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 43 [2020-07-20 13:35:19,797 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-20 13:35:19,997 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 35 [2020-07-20 13:35:20,123 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-20 13:35:21,096 WARN L193 SmtUtils]: Spent 596.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 30 [2020-07-20 13:35:21,120 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 13:35:21,120 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 13:35:21,120 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 13:35:21,121 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 13:35:21,121 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 13:35:21,121 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 13:35:21,121 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 27) no Hoare annotation was computed. [2020-07-20 13:35:21,121 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 23 30) the Hoare annotation is: true [2020-07-20 13:35:21,121 INFO L268 CegarLoopResult]: For program point L27(line 27) no Hoare annotation was computed. [2020-07-20 13:35:21,122 INFO L268 CegarLoopResult]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-07-20 13:35:21,122 INFO L264 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: (and (<= main_~x~0 5) (<= 5 main_~x~0)) [2020-07-20 13:35:21,122 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 23 30) no Hoare annotation was computed. [2020-07-20 13:35:21,122 INFO L268 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-07-20 13:35:21,122 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 28) no Hoare annotation was computed. [2020-07-20 13:35:21,122 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 23 30) no Hoare annotation was computed. [2020-07-20 13:35:21,122 INFO L268 CegarLoopResult]: For program point fiboEXIT(lines 5 13) no Hoare annotation was computed. [2020-07-20 13:35:21,122 INFO L268 CegarLoopResult]: For program point fiboFINAL(lines 5 13) no Hoare annotation was computed. [2020-07-20 13:35:21,122 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= fibo_~n |fibo_#in~n|) (<= |fibo_#in~n| fibo_~n) (<= 2 |fibo_#in~n|)) [2020-07-20 13:35:21,123 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-20 13:35:21,123 INFO L264 CegarLoopResult]: At program point L11-2(line 11) the Hoare annotation is: (and (let ((.cse0 (= |fibo_#t~ret0| 1)) (.cse1 (<= fibo_~n |fibo_#in~n|)) (.cse2 (<= |fibo_#in~n| fibo_~n))) (or (and .cse0 .cse1 .cse2 (<= 3 |fibo_#in~n|) (<= |fibo_#in~n| 3)) (and (<= 5 |fibo_#in~n|) .cse1 .cse2) (and (<= 4 |fibo_#in~n|) .cse1 (= |fibo_#t~ret0| 2) .cse2) (and .cse0 .cse1 (<= |fibo_#in~n| 2) .cse2 (<= 2 |fibo_#in~n|)))) (or (<= |fibo_#in~n| 4) (<= 6 |fibo_#in~n|) (= |fibo_#t~ret0| 3))) [2020-07-20 13:35:21,123 INFO L268 CegarLoopResult]: For program point L8(lines 8 12) no Hoare annotation was computed. [2020-07-20 13:35:21,123 INFO L268 CegarLoopResult]: For program point L11-3(line 11) no Hoare annotation was computed. [2020-07-20 13:35:21,123 INFO L268 CegarLoopResult]: For program point L6(lines 6 12) no Hoare annotation was computed. [2020-07-20 13:35:21,123 INFO L271 CegarLoopResult]: At program point fiboENTRY(lines 5 13) the Hoare annotation is: true [2020-07-20 13:35:21,130 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 01:35:21 BoogieIcfgContainer [2020-07-20 13:35:21,130 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 13:35:21,131 INFO L168 Benchmark]: Toolchain (without parser) took 26659.76 ms. Allocated memory was 140.5 MB in the beginning and 521.1 MB in the end (delta: 380.6 MB). Free memory was 99.3 MB in the beginning and 169.1 MB in the end (delta: -69.9 MB). Peak memory consumption was 371.9 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:21,132 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 140.5 MB. Free memory was 116.8 MB in the beginning and 116.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 13:35:21,132 INFO L168 Benchmark]: CACSL2BoogieTranslator took 250.17 ms. Allocated memory is still 140.5 MB. Free memory was 99.0 MB in the beginning and 89.3 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:21,133 INFO L168 Benchmark]: Boogie Preprocessor took 27.50 ms. Allocated memory is still 140.5 MB. Free memory was 89.3 MB in the beginning and 87.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:21,133 INFO L168 Benchmark]: RCFGBuilder took 356.50 ms. Allocated memory was 140.5 MB in the beginning and 198.7 MB in the end (delta: 58.2 MB). Free memory was 87.9 MB in the beginning and 165.9 MB in the end (delta: -78.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:21,134 INFO L168 Benchmark]: TraceAbstraction took 26016.38 ms. Allocated memory was 198.7 MB in the beginning and 521.1 MB in the end (delta: 322.4 MB). Free memory was 165.9 MB in the beginning and 169.1 MB in the end (delta: -3.2 MB). Peak memory consumption was 380.4 MB. Max. memory is 7.1 GB. [2020-07-20 13:35:21,136 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 140.5 MB. Free memory was 116.8 MB in the beginning and 116.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 250.17 ms. Allocated memory is still 140.5 MB. Free memory was 99.0 MB in the beginning and 89.3 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 27.50 ms. Allocated memory is still 140.5 MB. Free memory was 89.3 MB in the beginning and 87.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 356.50 ms. Allocated memory was 140.5 MB in the beginning and 198.7 MB in the end (delta: 58.2 MB). Free memory was 87.9 MB in the beginning and 165.9 MB in the end (delta: -78.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 26016.38 ms. Allocated memory was 198.7 MB in the beginning and 521.1 MB in the end (delta: 322.4 MB). Free memory was 165.9 MB in the beginning and 169.1 MB in the end (delta: -3.2 MB). Peak memory consumption was 380.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 27]: 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, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 21.9s, OverallIterations: 18, TraceHistogramMax: 27, AutomataDifference: 3.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 4.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 398 SDtfs, 466 SDslu, 1685 SDs, 0 SdLazy, 1727 SolverSat, 453 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3202 GetRequests, 2825 SyntacticMatches, 130 SemanticMatches, 247 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 739 ImplicationChecksByTransitivity, 3.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=81occurred in iteration=12, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 18 MinimizatonAttempts, 158 StatesRemovedByMinimization, 13 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 95 PreInvPairs, 1722 NumberOfFragments, 89 HoareAnnotationTreeSize, 95 FomulaSimplifications, 1048005 FormulaSimplificationTreeSizeReduction, 3.3s HoareSimplificationTime, 8 FomulaSimplificationsInter, 2891 FormulaSimplificationTreeSizeReductionInter, 0.6s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 13.0s InterpolantComputationTime, 1588 NumberOfCodeBlocks, 1336 NumberOfCodeBlocksAsserted, 58 NumberOfCheckSat, 3115 ConstructedInterpolants, 0 QuantifiedInterpolants, 657341 SizeOfPredicates, 77 NumberOfNonLiveVariables, 3146 ConjunctsInSsa, 222 ConjunctsInUnsatCore, 34 InterpolantComputations, 2 PerfectInterpolantSequences, 13700/18052 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...