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 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-examples/standard_two_index_08.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:46:58,758 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:46:58,761 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:46:58,780 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:46:58,780 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:46:58,782 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:46:58,784 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:46:58,793 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:46:58,797 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:46:58,800 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:46:58,802 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:46:58,804 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:46:58,804 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:46:58,806 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:46:58,808 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:46:58,809 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:46:58,811 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:46:58,812 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:46:58,813 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:46:58,818 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:46:58,822 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:46:58,824 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:46:58,827 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:46:58,828 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:46:58,830 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:46:58,841 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:46:58,841 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:46:58,843 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:46:58,844 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-14 21:46:58,879 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:46:58,879 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:46:58,881 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:46:58,881 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:46:58,884 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:46:58,884 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:46:58,884 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:46:58,885 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:46:58,885 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:46:58,885 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:46:58,885 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:46:58,885 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:46:58,886 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:46:58,886 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:46:58,886 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:46:58,887 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:46:58,887 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:46:58,888 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:46:58,888 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:46:58,888 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:46:58,888 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:46:58,888 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:46:58,888 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:46:58,889 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:46:58,889 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:46:58,889 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:46:58,889 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:46:58,889 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:46:58,890 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:46:59,192 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:46:59,216 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:46:59,220 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:46:59,221 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:46:59,222 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:46:59,222 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_two_index_08.i [2019-10-14 21:46:59,294 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b0e01881d/69dfc34220d94f84849f682c6d78d6c4/FLAGe8c880275 [2019-10-14 21:46:59,734 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:46:59,735 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_two_index_08.i [2019-10-14 21:46:59,741 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b0e01881d/69dfc34220d94f84849f682c6d78d6c4/FLAGe8c880275 [2019-10-14 21:47:00,173 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b0e01881d/69dfc34220d94f84849f682c6d78d6c4 [2019-10-14 21:47:00,183 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:47:00,185 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:47:00,190 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:47:00,190 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:47:00,194 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:47:00,195 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:47:00" (1/1) ... [2019-10-14 21:47:00,197 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@191613fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:00, skipping insertion in model container [2019-10-14 21:47:00,198 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:47:00" (1/1) ... [2019-10-14 21:47:00,205 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:47:00,224 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:47:00,413 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:47:00,425 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:47:00,452 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:47:00,469 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:47:00,470 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:00 WrapperNode [2019-10-14 21:47:00,470 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:47:00,470 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:47:00,471 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:47:00,471 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:47:00,553 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:00" (1/1) ... [2019-10-14 21:47:00,553 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:00" (1/1) ... [2019-10-14 21:47:00,559 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:00" (1/1) ... [2019-10-14 21:47:00,560 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:00" (1/1) ... [2019-10-14 21:47:00,573 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:00" (1/1) ... [2019-10-14 21:47:00,578 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:00" (1/1) ... [2019-10-14 21:47:00,579 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:00" (1/1) ... [2019-10-14 21:47:00,581 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:47:00,582 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:47:00,582 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:47:00,582 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:47:00,583 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:00" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:47:00,629 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:47:00,629 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:47:00,629 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:47:00,629 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:47:00,629 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:47:00,629 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:47:00,630 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 21:47:00,630 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:47:00,630 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:47:00,630 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:47:00,630 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:47:00,630 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:47:00,630 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:47:00,631 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:47:00,888 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:47:00,888 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-14 21:47:00,889 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:47:00 BoogieIcfgContainer [2019-10-14 21:47:00,889 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:47:00,891 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:47:00,891 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:47:00,900 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:47:00,901 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:47:00" (1/3) ... [2019-10-14 21:47:00,902 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@177627d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:47:00, skipping insertion in model container [2019-10-14 21:47:00,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:00" (2/3) ... [2019-10-14 21:47:00,911 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@177627d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:47:00, skipping insertion in model container [2019-10-14 21:47:00,911 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:47:00" (3/3) ... [2019-10-14 21:47:00,913 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_two_index_08.i [2019-10-14 21:47:00,930 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:47:00,937 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:47:00,948 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:47:00,968 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:47:00,968 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:47:00,968 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:47:00,968 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:47:00,968 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:47:00,968 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:47:00,968 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:47:00,969 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:47:00,982 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2019-10-14 21:47:00,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-14 21:47:00,988 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:00,989 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:00,991 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:00,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:00,997 INFO L82 PathProgramCache]: Analyzing trace with hash -2029643862, now seen corresponding path program 1 times [2019-10-14 21:47:01,004 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:01,005 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663362442] [2019-10-14 21:47:01,005 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:01,005 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:01,005 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:01,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:01,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:01,160 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:01,161 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663362442] [2019-10-14 21:47:01,162 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:47:01,162 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:47:01,162 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724371562] [2019-10-14 21:47:01,167 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:47:01,167 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:01,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:47:01,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:47:01,184 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 3 states. [2019-10-14 21:47:01,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:01,270 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2019-10-14 21:47:01,271 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:47:01,272 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-10-14 21:47:01,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:01,280 INFO L225 Difference]: With dead ends: 41 [2019-10-14 21:47:01,280 INFO L226 Difference]: Without dead ends: 19 [2019-10-14 21:47:01,283 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:47:01,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-10-14 21:47:01,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-10-14 21:47:01,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-10-14 21:47:01,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2019-10-14 21:47:01,315 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2019-10-14 21:47:01,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:01,315 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2019-10-14 21:47:01,315 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:47:01,316 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2019-10-14 21:47:01,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-14 21:47:01,316 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:01,317 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:01,317 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:01,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:01,318 INFO L82 PathProgramCache]: Analyzing trace with hash 905206694, now seen corresponding path program 1 times [2019-10-14 21:47:01,318 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:01,318 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349997227] [2019-10-14 21:47:01,319 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:01,319 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:01,319 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:01,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:01,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:01,397 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:01,398 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349997227] [2019-10-14 21:47:01,398 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:47:01,399 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:47:01,399 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190372594] [2019-10-14 21:47:01,400 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:47:01,401 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:01,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:47:01,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:47:01,402 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 4 states. [2019-10-14 21:47:01,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:01,471 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2019-10-14 21:47:01,472 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:47:01,472 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-10-14 21:47:01,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:01,473 INFO L225 Difference]: With dead ends: 32 [2019-10-14 21:47:01,474 INFO L226 Difference]: Without dead ends: 20 [2019-10-14 21:47:01,475 INFO L600 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 [2019-10-14 21:47:01,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-14 21:47:01,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-14 21:47:01,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-14 21:47:01,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-10-14 21:47:01,481 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2019-10-14 21:47:01,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:01,481 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-10-14 21:47:01,482 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:47:01,482 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-10-14 21:47:01,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-14 21:47:01,483 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:01,483 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:01,483 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:01,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:01,484 INFO L82 PathProgramCache]: Analyzing trace with hash -764882998, now seen corresponding path program 1 times [2019-10-14 21:47:01,484 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:01,484 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1727686840] [2019-10-14 21:47:01,485 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:01,485 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:01,485 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:01,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:01,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:01,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:47:01,564 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1727686840] [2019-10-14 21:47:01,565 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:47:01,565 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:47:01,565 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490427564] [2019-10-14 21:47:01,566 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:47:01,566 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:01,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:47:01,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:47:01,567 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 4 states. [2019-10-14 21:47:01,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:01,649 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2019-10-14 21:47:01,650 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:47:01,651 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2019-10-14 21:47:01,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:01,653 INFO L225 Difference]: With dead ends: 34 [2019-10-14 21:47:01,653 INFO L226 Difference]: Without dead ends: 24 [2019-10-14 21:47:01,654 INFO L600 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 [2019-10-14 21:47:01,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-14 21:47:01,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2019-10-14 21:47:01,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-14 21:47:01,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2019-10-14 21:47:01,673 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 16 [2019-10-14 21:47:01,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:01,673 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2019-10-14 21:47:01,674 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:47:01,674 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2019-10-14 21:47:01,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 21:47:01,676 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:01,676 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:01,677 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:01,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:01,677 INFO L82 PathProgramCache]: Analyzing trace with hash -59429947, now seen corresponding path program 1 times [2019-10-14 21:47:01,677 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:01,678 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747982762] [2019-10-14 21:47:01,678 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:01,678 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:01,678 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:01,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:01,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:01,771 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:47:01,771 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747982762] [2019-10-14 21:47:01,772 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [113601615] [2019-10-14 21:47:01,772 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:01,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:01,829 INFO L256 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:47:01,835 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:01,883 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:47:01,883 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:01,883 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2019-10-14 21:47:01,884 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033780505] [2019-10-14 21:47:01,884 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:47:01,885 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:01,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:47:01,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:47:01,886 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 7 states. [2019-10-14 21:47:01,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:01,987 INFO L93 Difference]: Finished difference Result 43 states and 51 transitions. [2019-10-14 21:47:01,989 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 21:47:01,989 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2019-10-14 21:47:01,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:01,990 INFO L225 Difference]: With dead ends: 43 [2019-10-14 21:47:01,990 INFO L226 Difference]: Without dead ends: 30 [2019-10-14 21:47:01,991 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:47:02,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-14 21:47:02,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2019-10-14 21:47:02,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-14 21:47:02,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-10-14 21:47:02,010 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2019-10-14 21:47:02,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:02,010 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-10-14 21:47:02,010 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:47:02,010 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-10-14 21:47:02,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-14 21:47:02,011 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:02,011 INFO L380 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:02,214 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:02,215 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:02,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:02,216 INFO L82 PathProgramCache]: Analyzing trace with hash -1897825622, now seen corresponding path program 2 times [2019-10-14 21:47:02,217 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:02,217 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [379983899] [2019-10-14 21:47:02,217 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:02,218 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:02,218 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:02,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:02,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:02,319 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 21:47:02,319 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [379983899] [2019-10-14 21:47:02,320 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [953945594] [2019-10-14 21:47:02,320 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:02,372 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:47:02,372 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:02,373 INFO L256 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 21:47:02,375 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:02,418 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-14 21:47:02,418 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:02,418 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2019-10-14 21:47:02,419 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858030974] [2019-10-14 21:47:02,419 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:47:02,419 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:02,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:47:02,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:47:02,420 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 10 states. [2019-10-14 21:47:02,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:02,542 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2019-10-14 21:47:02,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 21:47:02,542 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 20 [2019-10-14 21:47:02,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:02,544 INFO L225 Difference]: With dead ends: 51 [2019-10-14 21:47:02,544 INFO L226 Difference]: Without dead ends: 37 [2019-10-14 21:47:02,544 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:47:02,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-14 21:47:02,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 28. [2019-10-14 21:47:02,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-14 21:47:02,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-10-14 21:47:02,551 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 20 [2019-10-14 21:47:02,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:02,551 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-10-14 21:47:02,551 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:47:02,551 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-10-14 21:47:02,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-10-14 21:47:02,552 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:02,552 INFO L380 BasicCegarLoop]: trace histogram [6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:02,763 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:02,764 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:02,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:02,764 INFO L82 PathProgramCache]: Analyzing trace with hash -1456795255, now seen corresponding path program 3 times [2019-10-14 21:47:02,764 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:02,765 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505819270] [2019-10-14 21:47:02,765 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:02,765 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:02,765 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:02,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:02,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:02,899 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-14 21:47:02,900 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505819270] [2019-10-14 21:47:02,900 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1497678896] [2019-10-14 21:47:02,900 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:02,951 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 21:47:02,952 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:02,953 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 21:47:02,954 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:02,978 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-14 21:47:02,979 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:02,979 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-14 21:47:02,979 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546794107] [2019-10-14 21:47:02,980 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 21:47:02,980 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:02,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 21:47:02,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:47:02,980 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2019-10-14 21:47:03,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:03,087 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2019-10-14 21:47:03,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 21:47:03,088 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2019-10-14 21:47:03,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:03,089 INFO L225 Difference]: With dead ends: 51 [2019-10-14 21:47:03,089 INFO L226 Difference]: Without dead ends: 41 [2019-10-14 21:47:03,089 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:47:03,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-10-14 21:47:03,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 29. [2019-10-14 21:47:03,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-14 21:47:03,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-10-14 21:47:03,097 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 24 [2019-10-14 21:47:03,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:03,098 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-10-14 21:47:03,098 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 21:47:03,098 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-10-14 21:47:03,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-14 21:47:03,099 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:03,099 INFO L380 BasicCegarLoop]: trace histogram [6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:03,302 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:03,303 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:03,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:03,303 INFO L82 PathProgramCache]: Analyzing trace with hash -33873434, now seen corresponding path program 4 times [2019-10-14 21:47:03,304 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:03,304 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084249946] [2019-10-14 21:47:03,304 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:03,305 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:03,305 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:03,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:03,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:03,418 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-14 21:47:03,418 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084249946] [2019-10-14 21:47:03,418 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [492206024] [2019-10-14 21:47:03,419 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:03,468 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:47:03,468 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:03,469 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:47:03,471 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:03,594 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-14 21:47:03,594 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:03,594 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 15 [2019-10-14 21:47:03,595 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945371180] [2019-10-14 21:47:03,595 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:47:03,595 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:03,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:47:03,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=118, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:47:03,596 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 15 states. [2019-10-14 21:47:03,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:03,760 INFO L93 Difference]: Finished difference Result 66 states and 80 transitions. [2019-10-14 21:47:03,760 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:47:03,760 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2019-10-14 21:47:03,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:03,761 INFO L225 Difference]: With dead ends: 66 [2019-10-14 21:47:03,761 INFO L226 Difference]: Without dead ends: 50 [2019-10-14 21:47:03,762 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=92, Invalid=118, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:47:03,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-10-14 21:47:03,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 35. [2019-10-14 21:47:03,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-10-14 21:47:03,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2019-10-14 21:47:03,769 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 25 [2019-10-14 21:47:03,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:03,769 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2019-10-14 21:47:03,769 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:47:03,770 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2019-10-14 21:47:03,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-10-14 21:47:03,770 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:03,771 INFO L380 BasicCegarLoop]: trace histogram [11, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:03,972 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:03,973 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:03,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:03,974 INFO L82 PathProgramCache]: Analyzing trace with hash -1290022011, now seen corresponding path program 5 times [2019-10-14 21:47:03,974 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:03,975 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328983708] [2019-10-14 21:47:03,975 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:03,975 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:03,975 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:04,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:04,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:04,123 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-14 21:47:04,123 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328983708] [2019-10-14 21:47:04,123 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [789302329] [2019-10-14 21:47:04,124 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:04,359 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-10-14 21:47:04,359 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:04,361 INFO L256 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:47:04,363 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:04,486 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-14 21:47:04,486 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:04,487 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 14] total 20 [2019-10-14 21:47:04,487 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975704015] [2019-10-14 21:47:04,487 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:47:04,487 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:04,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:47:04,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=208, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:47:04,488 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 20 states. [2019-10-14 21:47:04,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:04,706 INFO L93 Difference]: Finished difference Result 76 states and 91 transitions. [2019-10-14 21:47:04,710 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-14 21:47:04,710 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2019-10-14 21:47:04,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:04,711 INFO L225 Difference]: With dead ends: 76 [2019-10-14 21:47:04,711 INFO L226 Difference]: Without dead ends: 59 [2019-10-14 21:47:04,711 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=172, Invalid=208, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:47:04,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-10-14 21:47:04,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 41. [2019-10-14 21:47:04,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-10-14 21:47:04,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2019-10-14 21:47:04,720 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 31 [2019-10-14 21:47:04,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:04,720 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2019-10-14 21:47:04,720 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:47:04,720 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2019-10-14 21:47:04,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-14 21:47:04,721 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:04,721 INFO L380 BasicCegarLoop]: trace histogram [16, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:04,923 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:04,923 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:04,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:04,924 INFO L82 PathProgramCache]: Analyzing trace with hash 678305990, now seen corresponding path program 6 times [2019-10-14 21:47:04,925 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:04,925 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730190204] [2019-10-14 21:47:04,926 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:04,926 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:04,926 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:04,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:05,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:05,025 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-10-14 21:47:05,025 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730190204] [2019-10-14 21:47:05,025 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675192208] [2019-10-14 21:47:05,025 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:05,281 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-14 21:47:05,281 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:05,283 INFO L256 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:47:05,286 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:05,304 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-10-14 21:47:05,304 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:05,304 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-14 21:47:05,304 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446221507] [2019-10-14 21:47:05,305 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 21:47:05,305 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:05,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 21:47:05,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:47:05,305 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 11 states. [2019-10-14 21:47:05,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:05,449 INFO L93 Difference]: Finished difference Result 73 states and 83 transitions. [2019-10-14 21:47:05,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 21:47:05,450 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 37 [2019-10-14 21:47:05,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:05,451 INFO L225 Difference]: With dead ends: 73 [2019-10-14 21:47:05,451 INFO L226 Difference]: Without dead ends: 63 [2019-10-14 21:47:05,452 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:47:05,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2019-10-14 21:47:05,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 42. [2019-10-14 21:47:05,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-10-14 21:47:05,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2019-10-14 21:47:05,460 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 37 [2019-10-14 21:47:05,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:05,460 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2019-10-14 21:47:05,460 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 21:47:05,460 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2019-10-14 21:47:05,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-10-14 21:47:05,461 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:05,462 INFO L380 BasicCegarLoop]: trace histogram [16, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:05,662 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:05,663 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:05,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:05,664 INFO L82 PathProgramCache]: Analyzing trace with hash 1729755721, now seen corresponding path program 7 times [2019-10-14 21:47:05,664 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:05,664 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398621159] [2019-10-14 21:47:05,664 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:05,665 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:05,665 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:05,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:05,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:05,822 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-10-14 21:47:05,822 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398621159] [2019-10-14 21:47:05,823 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [377940345] [2019-10-14 21:47:05,823 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:05,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:05,882 INFO L256 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 21:47:05,884 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:06,064 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-10-14 21:47:06,064 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:06,064 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 19] total 27 [2019-10-14 21:47:06,065 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653032012] [2019-10-14 21:47:06,067 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-14 21:47:06,067 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:06,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-14 21:47:06,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=376, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:47:06,070 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 27 states. [2019-10-14 21:47:06,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:06,372 INFO L93 Difference]: Finished difference Result 93 states and 112 transitions. [2019-10-14 21:47:06,373 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-10-14 21:47:06,373 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 38 [2019-10-14 21:47:06,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:06,376 INFO L225 Difference]: With dead ends: 93 [2019-10-14 21:47:06,376 INFO L226 Difference]: Without dead ends: 74 [2019-10-14 21:47:06,377 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=326, Invalid=376, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:47:06,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-10-14 21:47:06,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 50. [2019-10-14 21:47:06,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-10-14 21:47:06,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2019-10-14 21:47:06,392 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 38 [2019-10-14 21:47:06,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:06,393 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2019-10-14 21:47:06,393 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-14 21:47:06,393 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2019-10-14 21:47:06,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-10-14 21:47:06,396 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:06,396 INFO L380 BasicCegarLoop]: trace histogram [23, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:06,597 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:06,597 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:06,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:06,598 INFO L82 PathProgramCache]: Analyzing trace with hash -53699638, now seen corresponding path program 8 times [2019-10-14 21:47:06,598 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:06,598 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350111566] [2019-10-14 21:47:06,598 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:06,598 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:06,598 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:06,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:06,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:06,728 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2019-10-14 21:47:06,728 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350111566] [2019-10-14 21:47:06,728 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [826398223] [2019-10-14 21:47:06,728 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:06,800 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:47:06,800 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:06,801 INFO L256 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 25 conjunts are in the unsatisfiable core [2019-10-14 21:47:06,804 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:07,042 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 21:47:07,043 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:07,044 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 26] total 34 [2019-10-14 21:47:07,045 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666547753] [2019-10-14 21:47:07,045 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-10-14 21:47:07,045 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:07,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-10-14 21:47:07,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=529, Invalid=593, Unknown=0, NotChecked=0, Total=1122 [2019-10-14 21:47:07,047 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 34 states. [2019-10-14 21:47:07,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:07,315 INFO L93 Difference]: Finished difference Result 105 states and 125 transitions. [2019-10-14 21:47:07,316 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-14 21:47:07,316 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 46 [2019-10-14 21:47:07,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:07,317 INFO L225 Difference]: With dead ends: 105 [2019-10-14 21:47:07,317 INFO L226 Difference]: Without dead ends: 85 [2019-10-14 21:47:07,318 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 597 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=529, Invalid=593, Unknown=0, NotChecked=0, Total=1122 [2019-10-14 21:47:07,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2019-10-14 21:47:07,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 58. [2019-10-14 21:47:07,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-14 21:47:07,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2019-10-14 21:47:07,327 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 46 [2019-10-14 21:47:07,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:07,327 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2019-10-14 21:47:07,327 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-10-14 21:47:07,327 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2019-10-14 21:47:07,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-10-14 21:47:07,329 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:07,329 INFO L380 BasicCegarLoop]: trace histogram [30, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:07,536 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:07,537 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:07,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:07,538 INFO L82 PathProgramCache]: Analyzing trace with hash 1314604649, now seen corresponding path program 9 times [2019-10-14 21:47:07,538 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:07,539 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236553493] [2019-10-14 21:47:07,539 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:07,539 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:07,539 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:07,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:07,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:07,671 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2019-10-14 21:47:07,672 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236553493] [2019-10-14 21:47:07,672 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678768573] [2019-10-14 21:47:07,672 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:08,401 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-14 21:47:08,402 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:08,403 INFO L256 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 21:47:08,406 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:08,425 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2019-10-14 21:47:08,425 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:08,426 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-10-14 21:47:08,426 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619951428] [2019-10-14 21:47:08,426 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:47:08,427 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:08,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:47:08,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:47:08,427 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 14 states. [2019-10-14 21:47:08,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:08,599 INFO L93 Difference]: Finished difference Result 99 states and 112 transitions. [2019-10-14 21:47:08,600 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:47:08,600 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2019-10-14 21:47:08,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:08,601 INFO L225 Difference]: With dead ends: 99 [2019-10-14 21:47:08,601 INFO L226 Difference]: Without dead ends: 89 [2019-10-14 21:47:08,602 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:47:08,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-10-14 21:47:08,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 59. [2019-10-14 21:47:08,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-10-14 21:47:08,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2019-10-14 21:47:08,629 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 54 [2019-10-14 21:47:08,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:08,629 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2019-10-14 21:47:08,630 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:47:08,630 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2019-10-14 21:47:08,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-14 21:47:08,630 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:08,630 INFO L380 BasicCegarLoop]: trace histogram [30, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:08,834 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:08,835 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:08,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:08,836 INFO L82 PathProgramCache]: Analyzing trace with hash -19822330, now seen corresponding path program 10 times [2019-10-14 21:47:08,836 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:08,837 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111224357] [2019-10-14 21:47:08,837 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:08,837 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:08,838 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:08,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:08,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:08,988 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2019-10-14 21:47:08,988 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111224357] [2019-10-14 21:47:08,988 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1829381906] [2019-10-14 21:47:08,988 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:09,071 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:47:09,071 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:09,073 INFO L256 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 32 conjunts are in the unsatisfiable core [2019-10-14 21:47:09,078 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:09,403 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-10-14 21:47:09,403 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:09,404 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 33] total 42 [2019-10-14 21:47:09,404 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657530541] [2019-10-14 21:47:09,404 INFO L442 AbstractCegarLoop]: Interpolant automaton has 42 states [2019-10-14 21:47:09,404 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:09,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2019-10-14 21:47:09,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=821, Invalid=901, Unknown=0, NotChecked=0, Total=1722 [2019-10-14 21:47:09,406 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 42 states. [2019-10-14 21:47:09,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:09,705 INFO L93 Difference]: Finished difference Result 123 states and 146 transitions. [2019-10-14 21:47:09,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-10-14 21:47:09,706 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 55 [2019-10-14 21:47:09,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:09,707 INFO L225 Difference]: With dead ends: 123 [2019-10-14 21:47:09,707 INFO L226 Difference]: Without dead ends: 101 [2019-10-14 21:47:09,708 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1023 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=821, Invalid=901, Unknown=0, NotChecked=0, Total=1722 [2019-10-14 21:47:09,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2019-10-14 21:47:09,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 68. [2019-10-14 21:47:09,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-10-14 21:47:09,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2019-10-14 21:47:09,717 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 55 [2019-10-14 21:47:09,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:09,717 INFO L462 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2019-10-14 21:47:09,717 INFO L463 AbstractCegarLoop]: Interpolant automaton has 42 states. [2019-10-14 21:47:09,717 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2019-10-14 21:47:09,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-10-14 21:47:09,718 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:09,718 INFO L380 BasicCegarLoop]: trace histogram [38, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:09,922 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:09,922 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:09,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:09,923 INFO L82 PathProgramCache]: Analyzing trace with hash 1728612361, now seen corresponding path program 11 times [2019-10-14 21:47:09,923 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:09,923 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [499898501] [2019-10-14 21:47:09,923 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:09,924 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:09,924 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:09,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:10,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:10,144 INFO L134 CoverageAnalysis]: Checked inductivity of 807 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2019-10-14 21:47:10,144 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [499898501] [2019-10-14 21:47:10,145 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1343148372] [2019-10-14 21:47:10,145 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true