/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 --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 17:12:10,648 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 17:12:10,651 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 17:12:10,699 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 17:12:10,699 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 17:12:10,712 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 17:12:10,713 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 17:12:10,716 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 17:12:10,719 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 17:12:10,720 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 17:12:10,723 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 17:12:10,726 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 17:12:10,726 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 17:12:10,729 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 17:12:10,730 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 17:12:10,730 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 17:12:10,734 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 17:12:10,736 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 17:12:10,738 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 17:12:10,745 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 17:12:10,747 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 17:12:10,749 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 17:12:10,750 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 17:12:10,751 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 17:12:10,756 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 17:12:10,767 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 17:12:10,768 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 17:12:10,769 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 17:12:10,770 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 [2020-08-18 17:12:10,817 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 17:12:10,817 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 17:12:10,820 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 17:12:10,820 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 17:12:10,820 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 17:12:10,820 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 17:12:10,821 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 17:12:10,821 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 17:12:10,821 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 17:12:10,821 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 17:12:10,822 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 17:12:10,823 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 17:12:10,823 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 17:12:10,823 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 17:12:10,823 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 17:12:10,824 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 17:12:10,824 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 17:12:10,824 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 17:12:10,824 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 17:12:10,825 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 17:12:10,825 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 17:12:10,825 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:12:10,825 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 17:12:10,825 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 17:12:10,826 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 17:12:10,826 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 17:12:10,826 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 17:12:10,826 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 17:12:10,826 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 17:12:10,827 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.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; [2020-08-18 17:12:11,099 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 17:12:11,111 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 17:12:11,115 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 17:12:11,116 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 17:12:11,117 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 17:12:11,117 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2020-08-18 17:12:11,194 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c48443725/780118193cf7476da3300569bfff2127/FLAG086965226 [2020-08-18 17:12:11,665 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 17:12:11,666 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/string-2.i [2020-08-18 17:12:11,671 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c48443725/780118193cf7476da3300569bfff2127/FLAG086965226 [2020-08-18 17:12:12,034 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c48443725/780118193cf7476da3300569bfff2127 [2020-08-18 17:12:12,044 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 17:12:12,045 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 17:12:12,046 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 17:12:12,047 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 17:12:12,050 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 17:12:12,050 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:12:12" (1/1) ... [2020-08-18 17:12:12,053 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ea0c575 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:12, skipping insertion in model container [2020-08-18 17:12:12,053 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:12:12" (1/1) ... [2020-08-18 17:12:12,060 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 17:12:12,078 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 17:12:12,303 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:12:12,307 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 17:12:12,332 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:12:12,349 INFO L208 MainTranslator]: Completed translation [2020-08-18 17:12:12,350 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:12 WrapperNode [2020-08-18 17:12:12,350 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 17:12:12,351 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 17:12:12,351 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 17:12:12,351 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 17:12:12,439 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:12" (1/1) ... [2020-08-18 17:12:12,439 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:12" (1/1) ... [2020-08-18 17:12:12,455 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:12" (1/1) ... [2020-08-18 17:12:12,455 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:12" (1/1) ... [2020-08-18 17:12:12,467 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:12" (1/1) ... [2020-08-18 17:12:12,474 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:12" (1/1) ... [2020-08-18 17:12:12,475 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:12" (1/1) ... [2020-08-18 17:12:12,478 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 17:12:12,479 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 17:12:12,479 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 17:12:12,479 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 17:12:12,480 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:12" (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 [2020-08-18 17:12:12,538 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 17:12:12,539 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 17:12:12,539 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 17:12:12,539 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 17:12:12,539 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 17:12:12,539 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 17:12:12,540 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 17:12:12,540 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 17:12:12,540 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 17:12:12,540 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-18 17:12:12,540 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 17:12:12,540 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 17:12:12,540 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 17:12:12,541 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 17:12:12,541 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 17:12:12,541 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 17:12:12,541 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 17:12:12,846 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 17:12:12,847 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-08-18 17:12:12,853 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:12:12 BoogieIcfgContainer [2020-08-18 17:12:12,854 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 17:12:12,855 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 17:12:12,856 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 17:12:12,859 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 17:12:12,859 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 05:12:12" (1/3) ... [2020-08-18 17:12:12,860 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@535bf173 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:12:12, skipping insertion in model container [2020-08-18 17:12:12,860 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:12" (2/3) ... [2020-08-18 17:12:12,861 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@535bf173 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:12:12, skipping insertion in model container [2020-08-18 17:12:12,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:12:12" (3/3) ... [2020-08-18 17:12:12,863 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-08-18 17:12:12,876 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 17:12:12,885 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 17:12:12,903 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 17:12:12,931 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 17:12:12,932 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 17:12:12,932 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 17:12:12,932 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 17:12:12,932 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 17:12:12,932 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 17:12:12,932 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 17:12:12,933 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 17:12:12,958 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-08-18 17:12:12,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 17:12:12,970 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:12,971 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:12,972 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:12,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:12,984 INFO L82 PathProgramCache]: Analyzing trace with hash -522531256, now seen corresponding path program 1 times [2020-08-18 17:12:12,993 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:12,994 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2109915804] [2020-08-18 17:12:12,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:13,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:13,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:13,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:13,201 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:13,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2109915804] [2020-08-18 17:12:13,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:12:13,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:12:13,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085372895] [2020-08-18 17:12:13,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:12:13,211 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:13,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:12:13,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:12:13,229 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 4 states. [2020-08-18 17:12:13,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:13,459 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2020-08-18 17:12:13,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 17:12:13,462 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2020-08-18 17:12:13,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:13,474 INFO L225 Difference]: With dead ends: 73 [2020-08-18 17:12:13,474 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 17:12:13,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:12:13,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 17:12:13,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2020-08-18 17:12:13,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 17:12:13,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-08-18 17:12:13,527 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 22 [2020-08-18 17:12:13,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:13,527 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-08-18 17:12:13,528 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:12:13,528 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-08-18 17:12:13,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 17:12:13,529 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:13,529 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-08-18 17:12:13,530 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 17:12:13,530 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:13,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:13,531 INFO L82 PathProgramCache]: Analyzing trace with hash -1816798436, now seen corresponding path program 1 times [2020-08-18 17:12:13,531 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:13,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [262551039] [2020-08-18 17:12:13,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:13,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:13,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:13,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:13,634 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 17:12:13,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [262551039] [2020-08-18 17:12:13,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:13,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 17:12:13,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793970209] [2020-08-18 17:12:13,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 17:12:13,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:13,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 17:12:13,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:12:13,640 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 5 states. [2020-08-18 17:12:13,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:13,746 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-08-18 17:12:13,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:12:13,747 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 28 [2020-08-18 17:12:13,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:13,749 INFO L225 Difference]: With dead ends: 65 [2020-08-18 17:12:13,749 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 17:12:13,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:12:13,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 17:12:13,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2020-08-18 17:12:13,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 17:12:13,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-08-18 17:12:13,759 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2020-08-18 17:12:13,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:13,759 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-08-18 17:12:13,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 17:12:13,760 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-08-18 17:12:13,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 17:12:13,761 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:13,761 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] [2020-08-18 17:12:13,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 17:12:13,762 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:13,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:13,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1067646812, now seen corresponding path program 2 times [2020-08-18 17:12:13,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:13,764 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1434736118] [2020-08-18 17:12:13,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:13,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:13,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:13,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:13,853 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-18 17:12:13,853 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1434736118] [2020-08-18 17:12:13,854 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:13,854 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 17:12:13,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572818300] [2020-08-18 17:12:13,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 17:12:13,855 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:13,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 17:12:13,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:12:13,856 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 6 states. [2020-08-18 17:12:13,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:13,983 INFO L93 Difference]: Finished difference Result 75 states and 92 transitions. [2020-08-18 17:12:13,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 17:12:13,984 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2020-08-18 17:12:13,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:13,985 INFO L225 Difference]: With dead ends: 75 [2020-08-18 17:12:13,985 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 17:12:13,986 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:12:13,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 17:12:13,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2020-08-18 17:12:13,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 17:12:13,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-08-18 17:12:13,994 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2020-08-18 17:12:13,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:13,994 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-08-18 17:12:13,995 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 17:12:13,995 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-08-18 17:12:13,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 17:12:13,996 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:13,996 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:13,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 17:12:13,997 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:13,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:13,997 INFO L82 PathProgramCache]: Analyzing trace with hash -1245957476, now seen corresponding path program 3 times [2020-08-18 17:12:13,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:13,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [721522319] [2020-08-18 17:12:13,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:14,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:14,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:14,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:14,120 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-08-18 17:12:14,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [721522319] [2020-08-18 17:12:14,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:14,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 17:12:14,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088220374] [2020-08-18 17:12:14,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 17:12:14,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:14,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 17:12:14,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:12:14,123 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 7 states. [2020-08-18 17:12:14,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:14,244 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2020-08-18 17:12:14,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 17:12:14,245 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 36 [2020-08-18 17:12:14,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:14,246 INFO L225 Difference]: With dead ends: 85 [2020-08-18 17:12:14,246 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 17:12:14,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:12:14,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 17:12:14,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-08-18 17:12:14,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 17:12:14,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-08-18 17:12:14,254 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2020-08-18 17:12:14,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:14,254 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-08-18 17:12:14,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 17:12:14,255 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-08-18 17:12:14,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 17:12:14,256 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:14,256 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:14,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 17:12:14,257 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:14,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:14,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1106103076, now seen corresponding path program 4 times [2020-08-18 17:12:14,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:14,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [317813580] [2020-08-18 17:12:14,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:14,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:14,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:14,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:14,353 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-08-18 17:12:14,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [317813580] [2020-08-18 17:12:14,354 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:14,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 17:12:14,355 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137962814] [2020-08-18 17:12:14,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 17:12:14,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:14,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 17:12:14,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:12:14,356 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 8 states. [2020-08-18 17:12:14,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:14,497 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2020-08-18 17:12:14,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 17:12:14,498 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2020-08-18 17:12:14,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:14,499 INFO L225 Difference]: With dead ends: 93 [2020-08-18 17:12:14,499 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 17:12:14,500 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:12:14,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 17:12:14,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-08-18 17:12:14,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 17:12:14,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-18 17:12:14,507 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2020-08-18 17:12:14,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:14,508 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-18 17:12:14,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 17:12:14,508 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-18 17:12:14,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 17:12:14,509 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:14,509 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:14,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 17:12:14,510 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:14,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:14,510 INFO L82 PathProgramCache]: Analyzing trace with hash 1061537308, now seen corresponding path program 5 times [2020-08-18 17:12:14,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:14,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1204655816] [2020-08-18 17:12:14,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:14,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 17:12:14,572 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 17:12:14,572 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 17:12:14,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 17:12:14,609 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 05:12:14 BoogieIcfgContainer [2020-08-18 17:12:14,610 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 17:12:14,613 INFO L168 Benchmark]: Toolchain (without parser) took 2566.00 ms. Allocated memory was 142.1 MB in the beginning and 232.3 MB in the end (delta: 90.2 MB). Free memory was 105.4 MB in the beginning and 121.4 MB in the end (delta: -16.0 MB). Peak memory consumption was 74.2 MB. Max. memory is 7.1 GB. [2020-08-18 17:12:14,615 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 142.1 MB. Free memory was 123.6 MB in the beginning and 123.4 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-18 17:12:14,617 INFO L168 Benchmark]: CACSL2BoogieTranslator took 304.21 ms. Allocated memory is still 142.1 MB. Free memory was 105.2 MB in the beginning and 94.3 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-08-18 17:12:14,626 INFO L168 Benchmark]: Boogie Preprocessor took 127.43 ms. Allocated memory was 142.1 MB in the beginning and 205.0 MB in the end (delta: 62.9 MB). Free memory was 94.3 MB in the beginning and 182.4 MB in the end (delta: -88.1 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2020-08-18 17:12:14,626 INFO L168 Benchmark]: RCFGBuilder took 375.00 ms. Allocated memory is still 205.0 MB. Free memory was 182.4 MB in the beginning and 162.7 MB in the end (delta: 19.7 MB). Peak memory consumption was 19.7 MB. Max. memory is 7.1 GB. [2020-08-18 17:12:14,627 INFO L168 Benchmark]: TraceAbstraction took 1754.36 ms. Allocated memory was 205.0 MB in the beginning and 232.3 MB in the end (delta: 27.3 MB). Free memory was 162.1 MB in the beginning and 121.4 MB in the end (delta: 40.7 MB). Peak memory consumption was 68.0 MB. Max. memory is 7.1 GB. [2020-08-18 17:12:14,639 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 142.1 MB. Free memory was 123.6 MB in the beginning and 123.4 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 304.21 ms. Allocated memory is still 142.1 MB. Free memory was 105.2 MB in the beginning and 94.3 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 127.43 ms. Allocated memory was 142.1 MB in the beginning and 205.0 MB in the end (delta: 62.9 MB). Free memory was 94.3 MB in the beginning and 182.4 MB in the end (delta: -88.1 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 375.00 ms. Allocated memory is still 205.0 MB. Free memory was 182.4 MB in the beginning and 162.7 MB in the end (delta: 19.7 MB). Peak memory consumption was 19.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1754.36 ms. Allocated memory was 205.0 MB in the beginning and 232.3 MB in the end (delta: 27.3 MB). Free memory was 162.1 MB in the beginning and 121.4 MB in the end (delta: 40.7 MB). Peak memory consumption was 68.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 9]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 58. Possible FailurePath: [L20] char string_A[5], string_B[5]; [L21] int i, j, nc_A, nc_B, found=0; [L24] i=0 [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND FALSE !(i<5) [L26] EXPR string_A[5 -1] [L26] COND FALSE !(!(string_A[5 -1]=='\0')) [L28] i=0 [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND FALSE !(i<5) [L30] EXPR string_B[5 -1] [L30] COND FALSE !(!(string_B[5 -1]=='\0')) [L32] nc_A = 0 [L33] EXPR string_A[nc_A] [L33] COND FALSE !(string_A[nc_A]!='\0') [L36] nc_B = 0 [L37] EXPR string_B[nc_B] [L37] COND FALSE !(string_B[nc_B]!='\0') [L40] COND FALSE !(!(nc_B >= nc_A)) [L43] EXPR j=0 [L43] i=j=0 [L44] COND FALSE !((inc_B-1)<