/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SingleStatement --traceabstraction.use.minimal.unsat.core.enumeration false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-c90d42b [2020-09-24 14:56:09,643 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-24 14:56:09,647 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-24 14:56:09,673 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-24 14:56:09,674 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-24 14:56:09,675 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-24 14:56:09,676 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-24 14:56:09,678 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-24 14:56:09,680 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-24 14:56:09,681 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-24 14:56:09,683 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-24 14:56:09,684 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-24 14:56:09,684 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-24 14:56:09,685 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-24 14:56:09,687 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-24 14:56:09,688 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-24 14:56:09,689 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-24 14:56:09,690 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-24 14:56:09,692 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-24 14:56:09,694 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-24 14:56:09,696 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-24 14:56:09,697 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-24 14:56:09,698 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-24 14:56:09,700 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-24 14:56:09,702 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-24 14:56:09,703 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-24 14:56:09,703 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-24 14:56:09,704 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-24 14:56:09,705 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-24 14:56:09,706 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-09-24 14:56:09,712 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-24 14:56:09,713 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-24 14:56:09,714 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-24 14:56:09,715 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-24 14:56:09,742 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-24 14:56:09,742 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-24 14:56:09,743 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-24 14:56:09,744 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-24 14:56:09,744 INFO L138 SettingsManager]: * Use SBE=true [2020-09-24 14:56:09,744 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-24 14:56:09,744 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-24 14:56:09,744 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-24 14:56:09,745 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-24 14:56:09,745 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-24 14:56:09,745 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-24 14:56:09,745 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-24 14:56:09,745 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-24 14:56:09,746 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-24 14:56:09,747 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-24 14:56:09,747 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-24 14:56:09,747 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-24 14:56:09,747 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-24 14:56:09,748 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-24 14:56:09,748 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-24 14:56:09,748 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-24 14:56:09,748 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-24 14:56:09,748 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-24 14:56:09,750 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-24 14:56:09,750 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-24 14:56:09,750 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-24 14:56:09,750 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-24 14:56:09,750 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-24 14:56:09,750 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-24 14:56:09,751 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 -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SingleStatement Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> false [2020-09-24 14:56:10,230 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-24 14:56:10,257 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-24 14:56:10,264 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-24 14:56:10,266 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-24 14:56:10,266 INFO L275 PluginConnector]: CDTParser initialized [2020-09-24 14:56:10,268 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c [2020-09-24 14:56:10,363 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/21e621d50/ca6f40ac91884243b7b3666a34abe36c/FLAG830c7e567 [2020-09-24 14:56:10,906 INFO L306 CDTParser]: Found 1 translation units. [2020-09-24 14:56:10,907 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c [2020-09-24 14:56:10,916 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/21e621d50/ca6f40ac91884243b7b3666a34abe36c/FLAG830c7e567 [2020-09-24 14:56:11,241 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/21e621d50/ca6f40ac91884243b7b3666a34abe36c [2020-09-24 14:56:11,257 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-24 14:56:11,263 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-24 14:56:11,265 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-24 14:56:11,265 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-24 14:56:11,270 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-24 14:56:11,271 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 02:56:11" (1/1) ... [2020-09-24 14:56:11,276 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22f7f464 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 02:56:11, skipping insertion in model container [2020-09-24 14:56:11,276 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 02:56:11" (1/1) ... [2020-09-24 14:56:11,288 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-24 14:56:11,316 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-24 14:56:11,528 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-24 14:56:11,533 INFO L203 MainTranslator]: Completed pre-run [2020-09-24 14:56:11,554 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-24 14:56:11,568 INFO L208 MainTranslator]: Completed translation [2020-09-24 14:56:11,569 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 02:56:11 WrapperNode [2020-09-24 14:56:11,569 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-24 14:56:11,570 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-24 14:56:11,570 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-24 14:56:11,570 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-24 14:56:11,586 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 02:56:11" (1/1) ... [2020-09-24 14:56:11,587 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 02:56:11" (1/1) ... [2020-09-24 14:56:11,593 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 02:56:11" (1/1) ... [2020-09-24 14:56:11,593 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 02:56:11" (1/1) ... [2020-09-24 14:56:11,679 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 02:56:11" (1/1) ... [2020-09-24 14:56:11,683 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 02:56:11" (1/1) ... [2020-09-24 14:56:11,688 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 02:56:11" (1/1) ... [2020-09-24 14:56:11,690 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-24 14:56:11,690 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-24 14:56:11,691 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-24 14:56:11,691 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-24 14:56:11,692 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 02:56:11" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-24 14:56:11,760 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-24 14:56:11,760 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-24 14:56:11,760 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-09-24 14:56:11,760 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-09-24 14:56:11,761 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-24 14:56:11,761 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-24 14:56:11,761 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-24 14:56:11,761 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-09-24 14:56:11,761 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-09-24 14:56:11,762 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-24 14:56:11,762 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-24 14:56:11,762 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-24 14:56:12,009 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-24 14:56:12,009 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-24 14:56:12,014 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 02:56:12 BoogieIcfgContainer [2020-09-24 14:56:12,015 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-24 14:56:12,016 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-24 14:56:12,016 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-24 14:56:12,020 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-24 14:56:12,021 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.09 02:56:11" (1/3) ... [2020-09-24 14:56:12,022 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c558968 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 02:56:12, skipping insertion in model container [2020-09-24 14:56:12,022 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 02:56:11" (2/3) ... [2020-09-24 14:56:12,023 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c558968 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 02:56:12, skipping insertion in model container [2020-09-24 14:56:12,023 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 02:56:12" (3/3) ... [2020-09-24 14:56:12,025 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-2.c [2020-09-24 14:56:12,041 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-24 14:56:12,051 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-24 14:56:12,097 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-24 14:56:12,163 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-24 14:56:12,163 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-24 14:56:12,164 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-24 14:56:12,164 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-24 14:56:12,164 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-24 14:56:12,164 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-24 14:56:12,165 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-24 14:56:12,165 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-24 14:56:12,185 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states. [2020-09-24 14:56:12,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-24 14:56:12,192 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 14:56:12,194 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 14:56:12,194 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 14:56:12,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 14:56:12,200 INFO L82 PathProgramCache]: Analyzing trace with hash -1089710179, now seen corresponding path program 1 times [2020-09-24 14:56:12,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 14:56:12,210 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [188413134] [2020-09-24 14:56:12,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 14:56:12,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:12,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 14:56:12,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:12,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-24 14:56:12,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:12,445 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 14:56:12,446 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [188413134] [2020-09-24 14:56:12,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-24 14:56:12,448 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-24 14:56:12,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593855448] [2020-09-24 14:56:12,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-24 14:56:12,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 14:56:12,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-24 14:56:12,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-24 14:56:12,472 INFO L87 Difference]: Start difference. First operand 45 states. Second operand 5 states. [2020-09-24 14:56:12,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 14:56:12,604 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2020-09-24 14:56:12,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-24 14:56:12,606 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-09-24 14:56:12,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 14:56:12,618 INFO L225 Difference]: With dead ends: 58 [2020-09-24 14:56:12,619 INFO L226 Difference]: Without dead ends: 42 [2020-09-24 14:56:12,622 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-24 14:56:12,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-09-24 14:56:12,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-09-24 14:56:12,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-24 14:56:12,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2020-09-24 14:56:12,679 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 16 [2020-09-24 14:56:12,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 14:56:12,679 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2020-09-24 14:56:12,680 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-24 14:56:12,680 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2020-09-24 14:56:12,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-09-24 14:56:12,682 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 14:56:12,682 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 14:56:12,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-24 14:56:12,683 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 14:56:12,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 14:56:12,684 INFO L82 PathProgramCache]: Analyzing trace with hash -653728005, now seen corresponding path program 1 times [2020-09-24 14:56:12,684 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 14:56:12,684 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911898921] [2020-09-24 14:56:12,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 14:56:12,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:12,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 14:56:12,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:12,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-24 14:56:12,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:12,768 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 14:56:12,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911898921] [2020-09-24 14:56:12,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-24 14:56:12,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-24 14:56:12,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943525751] [2020-09-24 14:56:12,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-24 14:56:12,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 14:56:12,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-24 14:56:12,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-24 14:56:12,773 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand 5 states. [2020-09-24 14:56:12,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 14:56:12,857 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-09-24 14:56:12,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-24 14:56:12,859 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-09-24 14:56:12,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 14:56:12,861 INFO L225 Difference]: With dead ends: 50 [2020-09-24 14:56:12,861 INFO L226 Difference]: Without dead ends: 44 [2020-09-24 14:56:12,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-24 14:56:12,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-24 14:56:12,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-09-24 14:56:12,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-24 14:56:12,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2020-09-24 14:56:12,874 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 17 [2020-09-24 14:56:12,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 14:56:12,875 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2020-09-24 14:56:12,875 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-24 14:56:12,875 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2020-09-24 14:56:12,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-09-24 14:56:12,877 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 14:56:12,878 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 14:56:12,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-24 14:56:12,878 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 14:56:12,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 14:56:12,879 INFO L82 PathProgramCache]: Analyzing trace with hash -1617834856, now seen corresponding path program 1 times [2020-09-24 14:56:12,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 14:56:12,880 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1060932055] [2020-09-24 14:56:12,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 14:56:12,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:12,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 14:56:12,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:12,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-24 14:56:12,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:13,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-24 14:56:13,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,061 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-24 14:56:13,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1060932055] [2020-09-24 14:56:13,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 14:56:13,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-24 14:56:13,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607454255] [2020-09-24 14:56:13,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-24 14:56:13,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 14:56:13,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-24 14:56:13,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-09-24 14:56:13,064 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand 7 states. [2020-09-24 14:56:13,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 14:56:13,170 INFO L93 Difference]: Finished difference Result 82 states and 102 transitions. [2020-09-24 14:56:13,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-24 14:56:13,171 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 33 [2020-09-24 14:56:13,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 14:56:13,173 INFO L225 Difference]: With dead ends: 82 [2020-09-24 14:56:13,173 INFO L226 Difference]: Without dead ends: 46 [2020-09-24 14:56:13,178 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-09-24 14:56:13,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-09-24 14:56:13,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2020-09-24 14:56:13,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-09-24 14:56:13,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 51 transitions. [2020-09-24 14:56:13,200 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 51 transitions. Word has length 33 [2020-09-24 14:56:13,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 14:56:13,200 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 51 transitions. [2020-09-24 14:56:13,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-24 14:56:13,201 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 51 transitions. [2020-09-24 14:56:13,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-09-24 14:56:13,205 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 14:56:13,205 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 14:56:13,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-24 14:56:13,208 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 14:56:13,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 14:56:13,209 INFO L82 PathProgramCache]: Analyzing trace with hash 887160861, now seen corresponding path program 1 times [2020-09-24 14:56:13,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 14:56:13,210 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1465542754] [2020-09-24 14:56:13,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 14:56:13,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 14:56:13,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-24 14:56:13,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:13,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 14:56:13,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,375 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-24 14:56:13,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1465542754] [2020-09-24 14:56:13,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 14:56:13,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-24 14:56:13,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746657542] [2020-09-24 14:56:13,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-24 14:56:13,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 14:56:13,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-24 14:56:13,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-09-24 14:56:13,390 INFO L87 Difference]: Start difference. First operand 44 states and 51 transitions. Second operand 7 states. [2020-09-24 14:56:13,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 14:56:13,597 INFO L93 Difference]: Finished difference Result 74 states and 94 transitions. [2020-09-24 14:56:13,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-24 14:56:13,603 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 34 [2020-09-24 14:56:13,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 14:56:13,609 INFO L225 Difference]: With dead ends: 74 [2020-09-24 14:56:13,610 INFO L226 Difference]: Without dead ends: 68 [2020-09-24 14:56:13,611 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-09-24 14:56:13,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-09-24 14:56:13,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2020-09-24 14:56:13,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-09-24 14:56:13,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 83 transitions. [2020-09-24 14:56:13,639 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 83 transitions. Word has length 34 [2020-09-24 14:56:13,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 14:56:13,643 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 83 transitions. [2020-09-24 14:56:13,643 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-24 14:56:13,643 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 83 transitions. [2020-09-24 14:56:13,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-09-24 14:56:13,648 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 14:56:13,648 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 14:56:13,649 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-24 14:56:13,649 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 14:56:13,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 14:56:13,649 INFO L82 PathProgramCache]: Analyzing trace with hash 1875452576, now seen corresponding path program 1 times [2020-09-24 14:56:13,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 14:56:13,652 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [289521105] [2020-09-24 14:56:13,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 14:56:13,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 14:56:13,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-24 14:56:13,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:13,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:13,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-24 14:56:13,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-09-24 14:56:13,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,808 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-09-24 14:56:13,809 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [289521105] [2020-09-24 14:56:13,809 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 14:56:13,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-24 14:56:13,810 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142431288] [2020-09-24 14:56:13,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-24 14:56:13,811 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 14:56:13,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-24 14:56:13,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-09-24 14:56:13,811 INFO L87 Difference]: Start difference. First operand 66 states and 83 transitions. Second operand 6 states. [2020-09-24 14:56:13,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 14:56:13,901 INFO L93 Difference]: Finished difference Result 130 states and 178 transitions. [2020-09-24 14:56:13,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-24 14:56:13,901 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 50 [2020-09-24 14:56:13,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 14:56:13,904 INFO L225 Difference]: With dead ends: 130 [2020-09-24 14:56:13,904 INFO L226 Difference]: Without dead ends: 70 [2020-09-24 14:56:13,906 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-09-24 14:56:13,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-09-24 14:56:13,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-09-24 14:56:13,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-09-24 14:56:13,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 89 transitions. [2020-09-24 14:56:13,920 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 89 transitions. Word has length 50 [2020-09-24 14:56:13,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 14:56:13,921 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 89 transitions. [2020-09-24 14:56:13,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-24 14:56:13,921 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 89 transitions. [2020-09-24 14:56:13,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-09-24 14:56:13,923 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 14:56:13,923 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 14:56:13,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-24 14:56:13,924 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 14:56:13,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 14:56:13,924 INFO L82 PathProgramCache]: Analyzing trace with hash 104828256, now seen corresponding path program 1 times [2020-09-24 14:56:13,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 14:56:13,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2048318080] [2020-09-24 14:56:13,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 14:56:13,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 14:56:13,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-24 14:56:13,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:13,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:13,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:14,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 14:56:14,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-09-24 14:56:14,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,103 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-09-24 14:56:14,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2048318080] [2020-09-24 14:56:14,105 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 14:56:14,105 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-24 14:56:14,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332653224] [2020-09-24 14:56:14,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-24 14:56:14,106 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 14:56:14,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-24 14:56:14,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-24 14:56:14,107 INFO L87 Difference]: Start difference. First operand 70 states and 89 transitions. Second operand 8 states. [2020-09-24 14:56:14,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 14:56:14,238 INFO L93 Difference]: Finished difference Result 142 states and 197 transitions. [2020-09-24 14:56:14,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-24 14:56:14,239 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 51 [2020-09-24 14:56:14,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 14:56:14,241 INFO L225 Difference]: With dead ends: 142 [2020-09-24 14:56:14,242 INFO L226 Difference]: Without dead ends: 78 [2020-09-24 14:56:14,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-09-24 14:56:14,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-09-24 14:56:14,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 72. [2020-09-24 14:56:14,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-09-24 14:56:14,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 92 transitions. [2020-09-24 14:56:14,257 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 92 transitions. Word has length 51 [2020-09-24 14:56:14,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 14:56:14,257 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 92 transitions. [2020-09-24 14:56:14,258 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-24 14:56:14,258 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 92 transitions. [2020-09-24 14:56:14,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-09-24 14:56:14,261 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 14:56:14,261 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 14:56:14,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-24 14:56:14,261 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 14:56:14,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 14:56:14,262 INFO L82 PathProgramCache]: Analyzing trace with hash 1703786405, now seen corresponding path program 1 times [2020-09-24 14:56:14,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 14:56:14,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568553172] [2020-09-24 14:56:14,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 14:56:14,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 14:56:14,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-24 14:56:14,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:14,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:14,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 14:56:14,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-09-24 14:56:14,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,477 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-09-24 14:56:14,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568553172] [2020-09-24 14:56:14,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 14:56:14,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-24 14:56:14,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202105647] [2020-09-24 14:56:14,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-24 14:56:14,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 14:56:14,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-24 14:56:14,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-24 14:56:14,483 INFO L87 Difference]: Start difference. First operand 72 states and 92 transitions. Second operand 8 states. [2020-09-24 14:56:14,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 14:56:14,730 INFO L93 Difference]: Finished difference Result 118 states and 158 transitions. [2020-09-24 14:56:14,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-24 14:56:14,731 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 52 [2020-09-24 14:56:14,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 14:56:14,735 INFO L225 Difference]: With dead ends: 118 [2020-09-24 14:56:14,735 INFO L226 Difference]: Without dead ends: 112 [2020-09-24 14:56:14,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-09-24 14:56:14,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-09-24 14:56:14,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 106. [2020-09-24 14:56:14,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-09-24 14:56:14,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 145 transitions. [2020-09-24 14:56:14,777 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 145 transitions. Word has length 52 [2020-09-24 14:56:14,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 14:56:14,781 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 145 transitions. [2020-09-24 14:56:14,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-24 14:56:14,782 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 145 transitions. [2020-09-24 14:56:14,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-09-24 14:56:14,785 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 14:56:14,785 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 14:56:14,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-24 14:56:14,787 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 14:56:14,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 14:56:14,787 INFO L82 PathProgramCache]: Analyzing trace with hash -521446491, now seen corresponding path program 1 times [2020-09-24 14:56:14,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 14:56:14,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [933338664] [2020-09-24 14:56:14,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 14:56:14,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 14:56:14,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-24 14:56:14,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:14,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:14,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:14,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 14:56:14,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-09-24 14:56:14,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-09-24 14:56:14,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:14,969 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 18 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-09-24 14:56:14,970 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [933338664] [2020-09-24 14:56:14,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 14:56:14,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-24 14:56:14,971 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478127873] [2020-09-24 14:56:14,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-24 14:56:14,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 14:56:14,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-24 14:56:14,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-24 14:56:14,972 INFO L87 Difference]: Start difference. First operand 106 states and 145 transitions. Second operand 8 states. [2020-09-24 14:56:15,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 14:56:15,118 INFO L93 Difference]: Finished difference Result 227 states and 348 transitions. [2020-09-24 14:56:15,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-24 14:56:15,119 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 69 [2020-09-24 14:56:15,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 14:56:15,122 INFO L225 Difference]: With dead ends: 227 [2020-09-24 14:56:15,122 INFO L226 Difference]: Without dead ends: 127 [2020-09-24 14:56:15,124 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-09-24 14:56:15,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-09-24 14:56:15,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 115. [2020-09-24 14:56:15,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-09-24 14:56:15,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 161 transitions. [2020-09-24 14:56:15,143 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 161 transitions. Word has length 69 [2020-09-24 14:56:15,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 14:56:15,144 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 161 transitions. [2020-09-24 14:56:15,144 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-24 14:56:15,144 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 161 transitions. [2020-09-24 14:56:15,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-09-24 14:56:15,146 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 14:56:15,146 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 14:56:15,147 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-24 14:56:15,147 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 14:56:15,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 14:56:15,147 INFO L82 PathProgramCache]: Analyzing trace with hash -439633211, now seen corresponding path program 1 times [2020-09-24 14:56:15,148 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 14:56:15,148 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104067429] [2020-09-24 14:56:15,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 14:56:15,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 14:56:15,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-24 14:56:15,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:15,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:15,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:15,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 14:56:15,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-09-24 14:56:15,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-09-24 14:56:15,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,376 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-09-24 14:56:15,377 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104067429] [2020-09-24 14:56:15,377 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 14:56:15,377 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-24 14:56:15,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332679673] [2020-09-24 14:56:15,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-24 14:56:15,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 14:56:15,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-24 14:56:15,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-09-24 14:56:15,386 INFO L87 Difference]: Start difference. First operand 115 states and 161 transitions. Second operand 10 states. [2020-09-24 14:56:15,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 14:56:15,660 INFO L93 Difference]: Finished difference Result 257 states and 400 transitions. [2020-09-24 14:56:15,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-24 14:56:15,661 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 70 [2020-09-24 14:56:15,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 14:56:15,663 INFO L225 Difference]: With dead ends: 257 [2020-09-24 14:56:15,664 INFO L226 Difference]: Without dead ends: 151 [2020-09-24 14:56:15,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-09-24 14:56:15,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2020-09-24 14:56:15,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 133. [2020-09-24 14:56:15,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-09-24 14:56:15,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 191 transitions. [2020-09-24 14:56:15,684 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 191 transitions. Word has length 70 [2020-09-24 14:56:15,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 14:56:15,685 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 191 transitions. [2020-09-24 14:56:15,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-24 14:56:15,685 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 191 transitions. [2020-09-24 14:56:15,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-09-24 14:56:15,690 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 14:56:15,691 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 14:56:15,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-24 14:56:15,691 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 14:56:15,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 14:56:15,692 INFO L82 PathProgramCache]: Analyzing trace with hash 307755032, now seen corresponding path program 2 times [2020-09-24 14:56:15,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 14:56:15,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423037093] [2020-09-24 14:56:15,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 14:56:15,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 14:56:15,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-24 14:56:15,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:15,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:15,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:15,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 14:56:15,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-09-24 14:56:15,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-09-24 14:56:15,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:15,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:15,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:16,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 14:56:16,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-09-24 14:56:16,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,078 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 36 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-09-24 14:56:16,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423037093] [2020-09-24 14:56:16,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 14:56:16,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-24 14:56:16,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490078260] [2020-09-24 14:56:16,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-24 14:56:16,083 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 14:56:16,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-24 14:56:16,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-09-24 14:56:16,084 INFO L87 Difference]: Start difference. First operand 133 states and 191 transitions. Second operand 12 states. [2020-09-24 14:56:16,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 14:56:16,570 INFO L93 Difference]: Finished difference Result 265 states and 420 transitions. [2020-09-24 14:56:16,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-09-24 14:56:16,574 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 105 [2020-09-24 14:56:16,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 14:56:16,581 INFO L225 Difference]: With dead ends: 265 [2020-09-24 14:56:16,581 INFO L226 Difference]: Without dead ends: 116 [2020-09-24 14:56:16,584 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-09-24 14:56:16,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-09-24 14:56:16,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 95. [2020-09-24 14:56:16,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-09-24 14:56:16,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 117 transitions. [2020-09-24 14:56:16,609 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 117 transitions. Word has length 105 [2020-09-24 14:56:16,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 14:56:16,610 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 117 transitions. [2020-09-24 14:56:16,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-24 14:56:16,610 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 117 transitions. [2020-09-24 14:56:16,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-09-24 14:56:16,612 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 14:56:16,612 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 14:56:16,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-24 14:56:16,616 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 14:56:16,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 14:56:16,617 INFO L82 PathProgramCache]: Analyzing trace with hash 1352793328, now seen corresponding path program 2 times [2020-09-24 14:56:16,617 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 14:56:16,617 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [284141023] [2020-09-24 14:56:16,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 14:56:16,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 14:56:16,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-24 14:56:16,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:16,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:16,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:16,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:16,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 14:56:16,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-09-24 14:56:16,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-09-24 14:56:16,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-09-24 14:56:16,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-24 14:56:16,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-24 14:56:16,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 14:56:16,868 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 46 proven. 45 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2020-09-24 14:56:16,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [284141023] [2020-09-24 14:56:16,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 14:56:16,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-24 14:56:16,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167177877] [2020-09-24 14:56:16,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-24 14:56:16,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 14:56:16,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-24 14:56:16,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-09-24 14:56:16,871 INFO L87 Difference]: Start difference. First operand 95 states and 117 transitions. Second operand 10 states. [2020-09-24 14:56:17,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 14:56:17,073 INFO L93 Difference]: Finished difference Result 193 states and 255 transitions. [2020-09-24 14:56:17,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-24 14:56:17,075 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 105 [2020-09-24 14:56:17,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 14:56:17,078 INFO L225 Difference]: With dead ends: 193 [2020-09-24 14:56:17,078 INFO L226 Difference]: Without dead ends: 105 [2020-09-24 14:56:17,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-09-24 14:56:17,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-09-24 14:56:17,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2020-09-24 14:56:17,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-09-24 14:56:17,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 127 transitions. [2020-09-24 14:56:17,087 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 127 transitions. Word has length 105 [2020-09-24 14:56:17,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 14:56:17,087 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 127 transitions. [2020-09-24 14:56:17,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-24 14:56:17,088 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 127 transitions. [2020-09-24 14:56:17,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2020-09-24 14:56:17,090 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 14:56:17,090 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 14:56:17,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-24 14:56:17,090 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 14:56:17,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 14:56:17,091 INFO L82 PathProgramCache]: Analyzing trace with hash -1260071360, now seen corresponding path program 1 times [2020-09-24 14:56:17,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 14:56:17,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [763414128] [2020-09-24 14:56:17,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 14:56:17,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-24 14:56:17,119 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-24 14:56:17,120 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-24 14:56:17,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-24 14:56:17,157 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.09 02:56:17 BoogieIcfgContainer [2020-09-24 14:56:17,157 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-24 14:56:17,161 INFO L168 Benchmark]: Toolchain (without parser) took 5901.14 ms. Allocated memory was 140.0 MB in the beginning and 278.9 MB in the end (delta: 138.9 MB). Free memory was 103.2 MB in the beginning and 120.1 MB in the end (delta: -16.9 MB). Peak memory consumption was 122.1 MB. Max. memory is 7.1 GB. [2020-09-24 14:56:17,162 INFO L168 Benchmark]: CDTParser took 0.45 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-24 14:56:17,163 INFO L168 Benchmark]: CACSL2BoogieTranslator took 304.04 ms. Allocated memory is still 140.0 MB. Free memory was 102.6 MB in the beginning and 93.0 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-09-24 14:56:17,163 INFO L168 Benchmark]: Boogie Preprocessor took 120.44 ms. Allocated memory was 140.0 MB in the beginning and 202.9 MB in the end (delta: 62.9 MB). Free memory was 93.0 MB in the beginning and 181.6 MB in the end (delta: -88.6 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2020-09-24 14:56:17,164 INFO L168 Benchmark]: RCFGBuilder took 324.65 ms. Allocated memory is still 202.9 MB. Free memory was 181.6 MB in the beginning and 167.1 MB in the end (delta: 14.5 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-09-24 14:56:17,165 INFO L168 Benchmark]: TraceAbstraction took 5141.13 ms. Allocated memory was 202.9 MB in the beginning and 278.9 MB in the end (delta: 76.0 MB). Free memory was 167.1 MB in the beginning and 120.1 MB in the end (delta: 47.0 MB). Peak memory consumption was 123.0 MB. Max. memory is 7.1 GB. [2020-09-24 14:56:17,168 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.45 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 304.04 ms. Allocated memory is still 140.0 MB. Free memory was 102.6 MB in the beginning and 93.0 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 120.44 ms. Allocated memory was 140.0 MB in the beginning and 202.9 MB in the end (delta: 62.9 MB). Free memory was 93.0 MB in the beginning and 181.6 MB in the end (delta: -88.6 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 324.65 ms. Allocated memory is still 202.9 MB. Free memory was 181.6 MB in the beginning and 167.1 MB in the end (delta: 14.5 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5141.13 ms. Allocated memory was 202.9 MB in the beginning and 278.9 MB in the end (delta: 76.0 MB). Free memory was 167.1 MB in the beginning and 120.1 MB in the end (delta: 47.0 MB). Peak memory consumption was 123.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 5; [L37] CALL, EXPR fibo1(x) [L8] COND FALSE !(n < 1) [L10] COND FALSE !(n == 1) [L13] CALL, EXPR fibo2(n-1) [L18] COND FALSE !(n < 1) [L20] COND FALSE !(n == 1) [L23] CALL, EXPR fibo1(n-1) [L8] COND FALSE !(n < 1) [L10] COND FALSE !(n == 1) [L13] CALL, EXPR fibo2(n-1) [L18] COND FALSE !(n < 1) [L20] COND FALSE !(n == 1) [L23] CALL, EXPR fibo1(n-1) [L8] COND FALSE !(n < 1) [L10] COND TRUE n == 1 [L11] return 1; [L23] RET, EXPR fibo1(n-1) [L23] CALL, EXPR fibo1(n-2) [L8] COND TRUE n < 1 [L9] return 0; [L23] RET, EXPR fibo1(n-2) [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) [L13] CALL, EXPR fibo2(n-2) [L18] COND FALSE !(n < 1) [L20] COND TRUE n == 1 [L21] return 1; [L13] RET, EXPR fibo2(n-2) [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) [L23] CALL, EXPR fibo1(n-2) [L8] COND FALSE !(n < 1) [L10] COND FALSE !(n == 1) [L13] CALL, EXPR fibo2(n-1) [L18] COND FALSE !(n < 1) [L20] COND TRUE n == 1 [L21] return 1; [L13] RET, EXPR fibo2(n-1) [L13] CALL, EXPR fibo2(n-2) [L18] COND TRUE n < 1 [L19] return 0; [L13] RET, EXPR fibo2(n-2) [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) [L13] CALL, EXPR fibo2(n-2) [L18] COND FALSE !(n < 1) [L20] COND FALSE !(n == 1) [L23] CALL, EXPR fibo1(n-1) [L8] COND FALSE !(n < 1) [L10] COND FALSE !(n == 1) [L13] CALL, EXPR fibo2(n-1) [L18] COND FALSE !(n < 1) [L20] COND TRUE n == 1 [L21] return 1; [L13] RET, EXPR fibo2(n-1) [L13] CALL, EXPR fibo2(n-2) [L18] COND TRUE n < 1 [L19] return 0; [L13] RET, EXPR fibo2(n-2) [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) [L23] CALL, EXPR fibo1(n-2) [L8] COND FALSE !(n < 1) [L10] COND TRUE n == 1 [L11] return 1; [L23] RET, EXPR fibo1(n-2) [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) [L37] int result = fibo1(x); [L38] COND TRUE result == 5 [L39] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 45 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.9s, OverallIterations: 12, TraceHistogramMax: 8, AutomataDifference: 2.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 482 SDtfs, 476 SDslu, 1863 SDs, 0 SdLazy, 1200 SolverSat, 144 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 267 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=133occurred in iteration=9, 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, 11 MinimizatonAttempts, 69 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.9s InterpolantComputationTime, 742 NumberOfCodeBlocks, 742 NumberOfCodeBlocksAsserted, 12 NumberOfCheckSat, 591 ConstructedInterpolants, 0 QuantifiedInterpolants, 73493 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 11 InterpolantComputations, 2 PerfectInterpolantSequences, 318/462 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 incorrect! Received shutdown request...