/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_2-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 21:20:13,708 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 21:20:13,711 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 21:20:13,724 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 21:20:13,725 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 21:20:13,727 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 21:20:13,729 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 21:20:13,741 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 21:20:13,745 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 21:20:13,746 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 21:20:13,747 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 21:20:13,748 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 21:20:13,749 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 21:20:13,750 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 21:20:13,753 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 21:20:13,754 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 21:20:13,755 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 21:20:13,759 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 21:20:13,760 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 21:20:13,765 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 21:20:13,768 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 21:20:13,770 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 21:20:13,771 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 21:20:13,775 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 21:20:13,777 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 21:20:13,791 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 21:20:13,791 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 21:20:13,792 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 21:20:13,793 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 [2019-11-06 21:20:13,813 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 21:20:13,813 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 21:20:13,815 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 21:20:13,815 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 21:20:13,815 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 21:20:13,815 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 21:20:13,816 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 21:20:13,816 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 21:20:13,816 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 21:20:13,816 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 21:20:13,817 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 21:20:13,817 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 21:20:13,818 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 21:20:13,818 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 21:20:13,818 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 21:20:13,818 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 21:20:13,819 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 21:20:13,819 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 21:20:13,819 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 21:20:13,819 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 21:20:13,819 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 21:20:13,820 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 21:20:13,820 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 21:20:13,820 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 21:20:13,820 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 21:20:13,820 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 21:20:13,821 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 21:20:13,821 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 21:20:13,821 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 21:20:14,096 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 21:20:14,112 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 21:20:14,115 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 21:20:14,116 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 21:20:14,117 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 21:20:14,117 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_2-2.i [2019-11-06 21:20:14,189 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8d45a1230/b907d5d660f04ba9b6dfd366d8f3dc40/FLAG3a4ca060b [2019-11-06 21:20:14,622 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 21:20:14,623 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_2-2.i [2019-11-06 21:20:14,629 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8d45a1230/b907d5d660f04ba9b6dfd366d8f3dc40/FLAG3a4ca060b [2019-11-06 21:20:15,025 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8d45a1230/b907d5d660f04ba9b6dfd366d8f3dc40 [2019-11-06 21:20:15,037 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 21:20:15,039 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 21:20:15,040 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 21:20:15,040 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 21:20:15,044 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 21:20:15,045 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:20:15" (1/1) ... [2019-11-06 21:20:15,048 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22609a1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:15, skipping insertion in model container [2019-11-06 21:20:15,049 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:20:15" (1/1) ... [2019-11-06 21:20:15,057 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 21:20:15,073 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 21:20:15,281 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:20:15,290 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 21:20:15,308 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:20:15,326 INFO L192 MainTranslator]: Completed translation [2019-11-06 21:20:15,327 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:15 WrapperNode [2019-11-06 21:20:15,327 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 21:20:15,328 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 21:20:15,328 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 21:20:15,328 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 21:20:15,420 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:15" (1/1) ... [2019-11-06 21:20:15,420 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:15" (1/1) ... [2019-11-06 21:20:15,428 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:15" (1/1) ... [2019-11-06 21:20:15,430 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:15" (1/1) ... [2019-11-06 21:20:15,443 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:15" (1/1) ... [2019-11-06 21:20:15,449 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:15" (1/1) ... [2019-11-06 21:20:15,450 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:15" (1/1) ... [2019-11-06 21:20:15,452 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 21:20:15,453 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 21:20:15,453 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 21:20:15,453 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 21:20:15,454 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:15" (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 [2019-11-06 21:20:15,509 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 21:20:15,509 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 21:20:15,509 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 21:20:15,509 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 21:20:15,510 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 21:20:15,510 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 21:20:15,510 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 21:20:15,510 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 21:20:15,510 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 21:20:15,510 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 21:20:15,511 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 21:20:15,511 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 21:20:15,511 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 21:20:15,727 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 21:20:15,728 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 21:20:15,729 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:20:15 BoogieIcfgContainer [2019-11-06 21:20:15,729 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 21:20:15,740 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 21:20:15,740 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 21:20:15,747 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 21:20:15,748 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 09:20:15" (1/3) ... [2019-11-06 21:20:15,752 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23985d7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:20:15, skipping insertion in model container [2019-11-06 21:20:15,752 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:20:15" (2/3) ... [2019-11-06 21:20:15,756 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23985d7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:20:15, skipping insertion in model container [2019-11-06 21:20:15,756 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:20:15" (3/3) ... [2019-11-06 21:20:15,758 INFO L109 eAbstractionObserver]: Analyzing ICFG array_2-2.i [2019-11-06 21:20:15,778 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 21:20:15,789 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 21:20:15,812 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 21:20:15,835 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 21:20:15,835 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 21:20:15,835 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 21:20:15,835 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 21:20:15,835 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 21:20:15,836 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 21:20:15,836 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 21:20:15,836 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 21:20:15,850 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2019-11-06 21:20:15,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-06 21:20:15,855 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:15,856 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:15,858 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:15,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:15,862 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2019-11-06 21:20:15,869 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:15,870 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958848275] [2019-11-06 21:20:15,870 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:15,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,033 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:16,034 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958848275] [2019-11-06 21:20:16,035 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:20:16,035 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 21:20:16,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754741112] [2019-11-06 21:20:16,041 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 21:20:16,041 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:16,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 21:20:16,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 21:20:16,059 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2019-11-06 21:20:16,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:16,157 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2019-11-06 21:20:16,158 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 21:20:16,159 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-11-06 21:20:16,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:16,168 INFO L225 Difference]: With dead ends: 34 [2019-11-06 21:20:16,168 INFO L226 Difference]: Without dead ends: 14 [2019-11-06 21:20:16,174 INFO L630 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 [2019-11-06 21:20:16,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-11-06 21:20:16,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-11-06 21:20:16,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-06 21:20:16,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-11-06 21:20:16,213 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2019-11-06 21:20:16,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:16,214 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-11-06 21:20:16,214 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 21:20:16,215 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-11-06 21:20:16,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-06 21:20:16,215 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:16,216 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:16,217 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:16,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:16,217 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2019-11-06 21:20:16,218 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:16,218 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575618088] [2019-11-06 21:20:16,218 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:16,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,301 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:16,302 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575618088] [2019-11-06 21:20:16,302 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:20:16,302 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 21:20:16,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933813008] [2019-11-06 21:20:16,304 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 21:20:16,305 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:16,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 21:20:16,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 21:20:16,306 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2019-11-06 21:20:16,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:16,359 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2019-11-06 21:20:16,359 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 21:20:16,360 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2019-11-06 21:20:16,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:16,361 INFO L225 Difference]: With dead ends: 22 [2019-11-06 21:20:16,361 INFO L226 Difference]: Without dead ends: 16 [2019-11-06 21:20:16,362 INFO L630 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 [2019-11-06 21:20:16,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-11-06 21:20:16,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2019-11-06 21:20:16,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-06 21:20:16,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-11-06 21:20:16,368 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2019-11-06 21:20:16,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:16,368 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-11-06 21:20:16,368 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 21:20:16,369 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-11-06 21:20:16,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-06 21:20:16,369 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:16,370 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:16,370 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:16,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:16,370 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2019-11-06 21:20:16,371 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:16,371 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454106764] [2019-11-06 21:20:16,371 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:16,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:16,465 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454106764] [2019-11-06 21:20:16,465 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327972188] [2019-11-06 21:20:16,466 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 [2019-11-06 21:20:16,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,535 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 21:20:16,543 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:16,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:16,580 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:16,580 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-11-06 21:20:16,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784364158] [2019-11-06 21:20:16,581 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 21:20:16,581 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:16,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 21:20:16,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 21:20:16,582 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 6 states. [2019-11-06 21:20:16,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:16,634 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2019-11-06 21:20:16,634 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 21:20:16,634 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2019-11-06 21:20:16,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:16,635 INFO L225 Difference]: With dead ends: 24 [2019-11-06 21:20:16,635 INFO L226 Difference]: Without dead ends: 18 [2019-11-06 21:20:16,636 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 21:20:16,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-06 21:20:16,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2019-11-06 21:20:16,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-06 21:20:16,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-11-06 21:20:16,642 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2019-11-06 21:20:16,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:16,642 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-11-06 21:20:16,642 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 21:20:16,642 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-11-06 21:20:16,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-06 21:20:16,643 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:16,643 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:16,846 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:16,847 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:16,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:16,848 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2019-11-06 21:20:16,848 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:16,849 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478489977] [2019-11-06 21:20:16,849 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:16,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:16,957 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:16,958 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478489977] [2019-11-06 21:20:16,958 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956657655] [2019-11-06 21:20:16,958 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 [2019-11-06 21:20:17,011 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:17,012 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:17,013 INFO L256 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 21:20:17,015 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:17,036 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:17,039 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:17,039 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-11-06 21:20:17,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255051903] [2019-11-06 21:20:17,040 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 21:20:17,040 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:17,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 21:20:17,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 21:20:17,043 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2019-11-06 21:20:17,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:17,096 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2019-11-06 21:20:17,097 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 21:20:17,098 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2019-11-06 21:20:17,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:17,099 INFO L225 Difference]: With dead ends: 26 [2019-11-06 21:20:17,099 INFO L226 Difference]: Without dead ends: 20 [2019-11-06 21:20:17,100 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 21:20:17,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-06 21:20:17,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2019-11-06 21:20:17,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-06 21:20:17,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2019-11-06 21:20:17,111 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2019-11-06 21:20:17,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:17,113 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2019-11-06 21:20:17,113 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 21:20:17,113 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2019-11-06 21:20:17,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-06 21:20:17,125 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:17,125 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:17,330 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:17,330 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:17,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:17,331 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2019-11-06 21:20:17,331 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:17,334 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840616931] [2019-11-06 21:20:17,334 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:17,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:17,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:17,453 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:17,453 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840616931] [2019-11-06 21:20:17,454 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2081106648] [2019-11-06 21:20:17,454 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 [2019-11-06 21:20:17,512 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-06 21:20:17,512 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:17,513 INFO L256 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 21:20:17,517 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:17,533 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:17,534 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:17,534 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-11-06 21:20:17,534 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595243344] [2019-11-06 21:20:17,535 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 21:20:17,535 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:17,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 21:20:17,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 21:20:17,536 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 8 states. [2019-11-06 21:20:17,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:17,607 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2019-11-06 21:20:17,607 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 21:20:17,608 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2019-11-06 21:20:17,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:17,608 INFO L225 Difference]: With dead ends: 28 [2019-11-06 21:20:17,608 INFO L226 Difference]: Without dead ends: 22 [2019-11-06 21:20:17,609 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 21:20:17,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-06 21:20:17,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2019-11-06 21:20:17,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-06 21:20:17,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2019-11-06 21:20:17,613 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2019-11-06 21:20:17,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:17,614 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2019-11-06 21:20:17,614 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 21:20:17,614 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2019-11-06 21:20:17,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 21:20:17,615 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:17,615 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:17,819 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:17,825 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:17,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:17,825 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2019-11-06 21:20:17,826 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:17,826 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706035185] [2019-11-06 21:20:17,826 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:17,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:17,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:17,928 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:17,929 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706035185] [2019-11-06 21:20:17,929 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [743714532] [2019-11-06 21:20:17,929 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 [2019-11-06 21:20:17,965 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:17,966 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:17,967 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 21:20:17,968 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:17,985 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:17,985 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:17,985 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-11-06 21:20:17,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648435956] [2019-11-06 21:20:17,986 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 21:20:17,986 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:17,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 21:20:17,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 21:20:17,987 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 9 states. [2019-11-06 21:20:18,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:18,037 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2019-11-06 21:20:18,037 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 21:20:18,037 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 20 [2019-11-06 21:20:18,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:18,038 INFO L225 Difference]: With dead ends: 30 [2019-11-06 21:20:18,038 INFO L226 Difference]: Without dead ends: 24 [2019-11-06 21:20:18,039 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 21:20:18,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-06 21:20:18,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2019-11-06 21:20:18,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-06 21:20:18,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2019-11-06 21:20:18,044 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2019-11-06 21:20:18,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:18,044 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2019-11-06 21:20:18,044 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 21:20:18,044 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2019-11-06 21:20:18,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-06 21:20:18,045 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:18,045 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:18,245 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:18,246 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:18,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:18,247 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2019-11-06 21:20:18,247 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:18,247 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433630466] [2019-11-06 21:20:18,248 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:18,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:18,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:18,350 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:18,350 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433630466] [2019-11-06 21:20:18,351 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126784512] [2019-11-06 21:20:18,351 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 [2019-11-06 21:20:18,417 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-11-06 21:20:18,417 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:18,419 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 21:20:18,420 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:18,445 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:18,445 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:18,445 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-11-06 21:20:18,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234656481] [2019-11-06 21:20:18,449 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 21:20:18,450 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:18,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 21:20:18,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:20:18,451 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 10 states. [2019-11-06 21:20:18,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:18,531 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2019-11-06 21:20:18,531 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 21:20:18,531 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 22 [2019-11-06 21:20:18,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:18,532 INFO L225 Difference]: With dead ends: 32 [2019-11-06 21:20:18,532 INFO L226 Difference]: Without dead ends: 26 [2019-11-06 21:20:18,533 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:20:18,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-06 21:20:18,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2019-11-06 21:20:18,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-06 21:20:18,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2019-11-06 21:20:18,546 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2019-11-06 21:20:18,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:18,546 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2019-11-06 21:20:18,547 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 21:20:18,547 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2019-11-06 21:20:18,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-06 21:20:18,548 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:18,548 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:18,752 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:18,752 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:18,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:18,753 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2019-11-06 21:20:18,753 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:18,753 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323375874] [2019-11-06 21:20:18,753 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:18,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:18,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:18,865 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:18,866 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323375874] [2019-11-06 21:20:18,866 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576539593] [2019-11-06 21:20:18,866 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 [2019-11-06 21:20:18,935 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-06 21:20:18,935 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:18,937 INFO L256 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 21:20:18,939 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:18,958 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:18,958 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:18,959 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-11-06 21:20:18,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047299129] [2019-11-06 21:20:18,959 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 21:20:18,960 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:18,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 21:20:18,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 21:20:18,960 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 11 states. [2019-11-06 21:20:19,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:19,044 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2019-11-06 21:20:19,045 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 21:20:19,045 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 24 [2019-11-06 21:20:19,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:19,046 INFO L225 Difference]: With dead ends: 34 [2019-11-06 21:20:19,046 INFO L226 Difference]: Without dead ends: 28 [2019-11-06 21:20:19,047 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 21:20:19,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-06 21:20:19,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2019-11-06 21:20:19,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-06 21:20:19,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2019-11-06 21:20:19,052 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2019-11-06 21:20:19,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:19,052 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2019-11-06 21:20:19,052 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 21:20:19,053 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2019-11-06 21:20:19,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-06 21:20:19,053 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:19,054 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:19,254 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:19,255 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:19,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:19,256 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2019-11-06 21:20:19,256 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:19,257 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155914407] [2019-11-06 21:20:19,257 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:19,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:19,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:19,402 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:19,402 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155914407] [2019-11-06 21:20:19,403 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [433977207] [2019-11-06 21:20:19,404 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 [2019-11-06 21:20:19,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:19,449 INFO L256 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 21:20:19,451 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:19,477 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:19,478 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:19,478 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-11-06 21:20:19,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971519554] [2019-11-06 21:20:19,479 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 21:20:19,479 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:19,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 21:20:19,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 21:20:19,480 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 12 states. [2019-11-06 21:20:19,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:19,554 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2019-11-06 21:20:19,554 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 21:20:19,554 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 26 [2019-11-06 21:20:19,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:19,555 INFO L225 Difference]: With dead ends: 36 [2019-11-06 21:20:19,555 INFO L226 Difference]: Without dead ends: 30 [2019-11-06 21:20:19,558 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 21:20:19,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-11-06 21:20:19,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2019-11-06 21:20:19,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-06 21:20:19,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2019-11-06 21:20:19,564 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2019-11-06 21:20:19,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:19,566 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2019-11-06 21:20:19,567 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 21:20:19,567 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2019-11-06 21:20:19,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-06 21:20:19,568 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:19,568 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:19,774 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:19,774 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:19,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:19,775 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2019-11-06 21:20:19,775 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:19,776 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1430938231] [2019-11-06 21:20:19,776 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:19,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:19,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:19,893 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:19,893 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1430938231] [2019-11-06 21:20:19,893 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1174844500] [2019-11-06 21:20:19,893 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 [2019-11-06 21:20:19,943 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:19,943 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:19,944 INFO L256 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 21:20:19,946 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:19,962 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:19,962 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:19,962 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-11-06 21:20:19,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593939574] [2019-11-06 21:20:19,963 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 21:20:19,964 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:19,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 21:20:19,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 21:20:19,964 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 13 states. [2019-11-06 21:20:20,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:20,047 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2019-11-06 21:20:20,047 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 21:20:20,047 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 28 [2019-11-06 21:20:20,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:20,048 INFO L225 Difference]: With dead ends: 38 [2019-11-06 21:20:20,048 INFO L226 Difference]: Without dead ends: 32 [2019-11-06 21:20:20,049 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 21:20:20,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-06 21:20:20,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2019-11-06 21:20:20,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-06 21:20:20,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2019-11-06 21:20:20,061 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2019-11-06 21:20:20,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:20,062 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2019-11-06 21:20:20,062 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 21:20:20,062 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2019-11-06 21:20:20,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-06 21:20:20,066 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:20,066 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:20,267 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:20,267 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:20,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:20,268 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2019-11-06 21:20:20,269 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:20,269 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914261752] [2019-11-06 21:20:20,269 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:20,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:20,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:20,394 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:20,394 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914261752] [2019-11-06 21:20:20,394 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1176098600] [2019-11-06 21:20:20,395 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 [2019-11-06 21:20:20,486 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-11-06 21:20:20,486 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:20,487 INFO L256 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 21:20:20,489 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:20,503 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:20,503 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:20,503 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-11-06 21:20:20,504 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863731405] [2019-11-06 21:20:20,504 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 21:20:20,504 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:20,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 21:20:20,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 21:20:20,505 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 14 states. [2019-11-06 21:20:20,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:20,586 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2019-11-06 21:20:20,586 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-06 21:20:20,587 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 30 [2019-11-06 21:20:20,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:20,587 INFO L225 Difference]: With dead ends: 40 [2019-11-06 21:20:20,587 INFO L226 Difference]: Without dead ends: 34 [2019-11-06 21:20:20,590 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 21:20:20,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-06 21:20:20,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2019-11-06 21:20:20,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-06 21:20:20,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2019-11-06 21:20:20,600 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2019-11-06 21:20:20,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:20,600 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2019-11-06 21:20:20,600 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 21:20:20,600 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2019-11-06 21:20:20,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-06 21:20:20,601 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:20,601 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:20,802 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:20,803 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:20,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:20,803 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2019-11-06 21:20:20,804 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:20,804 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1660148418] [2019-11-06 21:20:20,804 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:20,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:20,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:20,946 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:20,947 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1660148418] [2019-11-06 21:20:20,947 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96581511] [2019-11-06 21:20:20,947 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 [2019-11-06 21:20:20,987 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:20,987 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:20,988 INFO L256 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 21:20:20,991 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:21,009 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:21,009 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:21,009 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-11-06 21:20:21,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238393272] [2019-11-06 21:20:21,010 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 21:20:21,010 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:21,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 21:20:21,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 21:20:21,011 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 15 states. [2019-11-06 21:20:21,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:21,125 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2019-11-06 21:20:21,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 21:20:21,125 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 32 [2019-11-06 21:20:21,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:21,126 INFO L225 Difference]: With dead ends: 42 [2019-11-06 21:20:21,126 INFO L226 Difference]: Without dead ends: 36 [2019-11-06 21:20:21,127 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 21:20:21,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-06 21:20:21,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2019-11-06 21:20:21,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-11-06 21:20:21,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2019-11-06 21:20:21,132 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2019-11-06 21:20:21,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:21,132 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2019-11-06 21:20:21,132 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 21:20:21,132 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2019-11-06 21:20:21,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-11-06 21:20:21,133 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:21,133 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:21,337 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:21,337 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:21,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:21,338 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2019-11-06 21:20:21,338 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:21,339 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2047941724] [2019-11-06 21:20:21,339 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:21,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:21,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:21,488 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:21,488 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2047941724] [2019-11-06 21:20:21,488 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [662119570] [2019-11-06 21:20:21,489 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 [2019-11-06 21:20:21,744 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-11-06 21:20:21,744 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:21,746 INFO L256 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 21:20:21,748 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:21,766 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:21,767 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:21,767 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-11-06 21:20:21,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117165516] [2019-11-06 21:20:21,768 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-06 21:20:21,768 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:21,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-06 21:20:21,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 21:20:21,769 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 16 states. [2019-11-06 21:20:21,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:21,872 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2019-11-06 21:20:21,872 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 21:20:21,873 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 34 [2019-11-06 21:20:21,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:21,874 INFO L225 Difference]: With dead ends: 44 [2019-11-06 21:20:21,874 INFO L226 Difference]: Without dead ends: 38 [2019-11-06 21:20:21,875 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 21:20:21,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-11-06 21:20:21,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2019-11-06 21:20:21,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-06 21:20:21,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2019-11-06 21:20:21,881 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2019-11-06 21:20:21,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:21,881 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2019-11-06 21:20:21,881 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-06 21:20:21,881 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2019-11-06 21:20:21,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-11-06 21:20:21,882 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:21,882 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:22,090 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:22,091 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:22,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:22,091 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2019-11-06 21:20:22,092 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:22,092 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307600145] [2019-11-06 21:20:22,092 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:22,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:22,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:22,309 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:22,309 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307600145] [2019-11-06 21:20:22,309 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [392282695] [2019-11-06 21:20:22,310 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:22,478 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-11-06 21:20:22,478 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:22,479 INFO L256 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-06 21:20:22,481 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:22,499 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:22,499 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:22,499 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-11-06 21:20:22,500 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171878649] [2019-11-06 21:20:22,500 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-06 21:20:22,500 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:22,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-06 21:20:22,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-11-06 21:20:22,501 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 17 states. [2019-11-06 21:20:22,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:22,609 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2019-11-06 21:20:22,609 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-06 21:20:22,609 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 36 [2019-11-06 21:20:22,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:22,610 INFO L225 Difference]: With dead ends: 46 [2019-11-06 21:20:22,610 INFO L226 Difference]: Without dead ends: 40 [2019-11-06 21:20:22,611 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-11-06 21:20:22,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-11-06 21:20:22,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2019-11-06 21:20:22,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-06 21:20:22,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2019-11-06 21:20:22,618 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2019-11-06 21:20:22,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:22,619 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2019-11-06 21:20:22,619 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-06 21:20:22,619 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2019-11-06 21:20:22,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-06 21:20:22,619 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:22,619 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:22,820 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:22,820 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:22,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:22,821 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2019-11-06 21:20:22,821 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:22,821 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [568348118] [2019-11-06 21:20:22,822 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:22,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:23,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:23,010 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:23,011 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [568348118] [2019-11-06 21:20:23,011 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2127695430] [2019-11-06 21:20:23,011 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:23,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:23,064 INFO L256 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 21:20:23,065 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:23,086 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:23,087 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:23,087 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-11-06 21:20:23,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954925388] [2019-11-06 21:20:23,087 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 21:20:23,088 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:23,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 21:20:23,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 21:20:23,088 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 18 states. [2019-11-06 21:20:23,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:23,163 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2019-11-06 21:20:23,163 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 21:20:23,163 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 38 [2019-11-06 21:20:23,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:23,164 INFO L225 Difference]: With dead ends: 48 [2019-11-06 21:20:23,164 INFO L226 Difference]: Without dead ends: 42 [2019-11-06 21:20:23,165 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 21:20:23,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-11-06 21:20:23,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2019-11-06 21:20:23,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-11-06 21:20:23,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2019-11-06 21:20:23,171 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2019-11-06 21:20:23,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:23,171 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2019-11-06 21:20:23,171 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 21:20:23,171 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2019-11-06 21:20:23,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-11-06 21:20:23,172 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:23,172 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:23,376 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:23,376 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:23,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:23,377 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2019-11-06 21:20:23,377 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:23,378 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2128679321] [2019-11-06 21:20:23,378 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:23,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:23,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:23,557 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:23,557 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2128679321] [2019-11-06 21:20:23,557 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51963671] [2019-11-06 21:20:23,557 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:23,625 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:23,626 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:23,626 INFO L256 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 21:20:23,628 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:23,642 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:23,643 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:23,643 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-11-06 21:20:23,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123346841] [2019-11-06 21:20:23,644 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 21:20:23,644 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:23,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 21:20:23,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 21:20:23,645 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 19 states. [2019-11-06 21:20:23,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:23,767 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2019-11-06 21:20:23,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 21:20:23,768 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 40 [2019-11-06 21:20:23,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:23,769 INFO L225 Difference]: With dead ends: 50 [2019-11-06 21:20:23,770 INFO L226 Difference]: Without dead ends: 44 [2019-11-06 21:20:23,771 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 21:20:23,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-11-06 21:20:23,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2019-11-06 21:20:23,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-06 21:20:23,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2019-11-06 21:20:23,775 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2019-11-06 21:20:23,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:23,776 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2019-11-06 21:20:23,776 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 21:20:23,776 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2019-11-06 21:20:23,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-06 21:20:23,777 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:23,777 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:23,986 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:23,986 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:23,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:23,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2019-11-06 21:20:23,987 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:23,988 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1998385076] [2019-11-06 21:20:23,988 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:24,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:24,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:24,221 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:24,222 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1998385076] [2019-11-06 21:20:24,222 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2071459510] [2019-11-06 21:20:24,222 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:24,573 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-11-06 21:20:24,573 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:24,575 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-06 21:20:24,577 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:24,603 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:24,603 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:24,603 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-11-06 21:20:24,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474887419] [2019-11-06 21:20:24,604 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 21:20:24,604 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:24,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 21:20:24,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:20:24,605 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 20 states. [2019-11-06 21:20:24,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:24,688 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2019-11-06 21:20:24,688 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-06 21:20:24,688 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2019-11-06 21:20:24,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:24,689 INFO L225 Difference]: With dead ends: 52 [2019-11-06 21:20:24,690 INFO L226 Difference]: Without dead ends: 46 [2019-11-06 21:20:24,691 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:20:24,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-06 21:20:24,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2019-11-06 21:20:24,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-11-06 21:20:24,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2019-11-06 21:20:24,696 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2019-11-06 21:20:24,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:24,696 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2019-11-06 21:20:24,696 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 21:20:24,696 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2019-11-06 21:20:24,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-06 21:20:24,697 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:24,697 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:24,901 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:24,901 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:24,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:24,902 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2019-11-06 21:20:24,902 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:24,902 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [952447685] [2019-11-06 21:20:24,903 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:24,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:25,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:25,132 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:25,132 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [952447685] [2019-11-06 21:20:25,133 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760535759] [2019-11-06 21:20:25,133 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:25,182 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:25,183 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:25,184 INFO L256 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 21:20:25,185 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:25,217 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:25,218 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:25,218 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-11-06 21:20:25,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272068693] [2019-11-06 21:20:25,219 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 21:20:25,219 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:25,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 21:20:25,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 21:20:25,220 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 21 states. [2019-11-06 21:20:25,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:25,325 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2019-11-06 21:20:25,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-06 21:20:25,326 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 44 [2019-11-06 21:20:25,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:25,326 INFO L225 Difference]: With dead ends: 54 [2019-11-06 21:20:25,327 INFO L226 Difference]: Without dead ends: 48 [2019-11-06 21:20:25,327 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 21:20:25,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-06 21:20:25,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2019-11-06 21:20:25,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-11-06 21:20:25,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2019-11-06 21:20:25,332 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2019-11-06 21:20:25,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:25,333 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2019-11-06 21:20:25,333 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 21:20:25,333 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2019-11-06 21:20:25,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-06 21:20:25,334 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:25,334 INFO L410 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:25,537 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:25,538 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:25,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:25,538 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2019-11-06 21:20:25,539 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:25,539 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370754073] [2019-11-06 21:20:25,539 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:25,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:25,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:25,782 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:25,783 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370754073] [2019-11-06 21:20:25,783 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2095792062] [2019-11-06 21:20:25,783 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:26,073 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-11-06 21:20:26,074 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:26,076 INFO L256 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-06 21:20:26,077 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:26,094 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:26,095 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:26,095 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-11-06 21:20:26,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943462351] [2019-11-06 21:20:26,096 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-06 21:20:26,096 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:26,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-06 21:20:26,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 21:20:26,097 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 22 states. [2019-11-06 21:20:26,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:26,218 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2019-11-06 21:20:26,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-06 21:20:26,218 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 46 [2019-11-06 21:20:26,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:26,219 INFO L225 Difference]: With dead ends: 56 [2019-11-06 21:20:26,219 INFO L226 Difference]: Without dead ends: 50 [2019-11-06 21:20:26,220 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 21:20:26,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-11-06 21:20:26,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2019-11-06 21:20:26,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-11-06 21:20:26,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2019-11-06 21:20:26,224 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2019-11-06 21:20:26,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:26,224 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2019-11-06 21:20:26,224 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-06 21:20:26,224 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2019-11-06 21:20:26,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-11-06 21:20:26,225 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:26,225 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:26,429 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:26,429 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:26,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:26,430 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2019-11-06 21:20:26,430 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:26,430 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237739261] [2019-11-06 21:20:26,430 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:26,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:26,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:26,675 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:26,676 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237739261] [2019-11-06 21:20:26,676 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1223810914] [2019-11-06 21:20:26,676 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:27,276 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-11-06 21:20:27,276 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:27,279 INFO L256 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-06 21:20:27,280 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:27,295 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:27,295 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:27,295 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2019-11-06 21:20:27,295 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864848590] [2019-11-06 21:20:27,296 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 21:20:27,296 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:27,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 21:20:27,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-11-06 21:20:27,297 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 23 states. [2019-11-06 21:20:27,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:27,450 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2019-11-06 21:20:27,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-06 21:20:27,451 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 48 [2019-11-06 21:20:27,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:27,451 INFO L225 Difference]: With dead ends: 58 [2019-11-06 21:20:27,451 INFO L226 Difference]: Without dead ends: 52 [2019-11-06 21:20:27,452 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-11-06 21:20:27,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-06 21:20:27,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2019-11-06 21:20:27,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-11-06 21:20:27,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2019-11-06 21:20:27,456 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2019-11-06 21:20:27,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:27,457 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2019-11-06 21:20:27,457 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 21:20:27,457 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2019-11-06 21:20:27,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-11-06 21:20:27,457 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:27,458 INFO L410 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:27,666 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:27,666 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:27,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:27,667 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2019-11-06 21:20:27,667 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:27,668 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674891619] [2019-11-06 21:20:27,668 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:27,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:27,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:27,894 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:27,894 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674891619] [2019-11-06 21:20:27,894 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1964523346] [2019-11-06 21:20:27,894 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:27,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:27,971 INFO L256 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-06 21:20:27,972 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:27,986 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:27,986 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:27,986 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-11-06 21:20:27,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923402620] [2019-11-06 21:20:27,987 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-06 21:20:27,987 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:27,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-06 21:20:27,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 21:20:27,988 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 24 states. [2019-11-06 21:20:28,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:28,069 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2019-11-06 21:20:28,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-06 21:20:28,070 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 50 [2019-11-06 21:20:28,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:28,071 INFO L225 Difference]: With dead ends: 60 [2019-11-06 21:20:28,071 INFO L226 Difference]: Without dead ends: 54 [2019-11-06 21:20:28,072 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 21:20:28,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-11-06 21:20:28,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2019-11-06 21:20:28,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-11-06 21:20:28,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2019-11-06 21:20:28,077 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2019-11-06 21:20:28,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:28,077 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2019-11-06 21:20:28,077 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-06 21:20:28,078 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2019-11-06 21:20:28,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-11-06 21:20:28,078 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:28,078 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:28,281 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:28,281 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:28,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:28,282 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2019-11-06 21:20:28,282 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:28,283 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477512860] [2019-11-06 21:20:28,283 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:28,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:28,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:28,572 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:28,572 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477512860] [2019-11-06 21:20:28,573 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1033947835] [2019-11-06 21:20:28,573 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:28,633 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:28,634 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:28,635 INFO L256 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-06 21:20:28,636 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:28,663 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:28,664 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:28,664 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2019-11-06 21:20:28,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885747224] [2019-11-06 21:20:28,665 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-06 21:20:28,665 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:28,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-06 21:20:28,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 21:20:28,666 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 25 states. [2019-11-06 21:20:28,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:28,807 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2019-11-06 21:20:28,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-06 21:20:28,810 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 52 [2019-11-06 21:20:28,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:28,811 INFO L225 Difference]: With dead ends: 62 [2019-11-06 21:20:28,811 INFO L226 Difference]: Without dead ends: 56 [2019-11-06 21:20:28,811 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 21:20:28,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-11-06 21:20:28,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2019-11-06 21:20:28,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-11-06 21:20:28,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2019-11-06 21:20:28,817 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2019-11-06 21:20:28,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:28,822 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2019-11-06 21:20:28,822 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-06 21:20:28,822 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2019-11-06 21:20:28,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-11-06 21:20:28,823 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:28,823 INFO L410 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:29,023 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:29,024 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:29,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:29,024 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2019-11-06 21:20:29,024 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:29,025 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925920952] [2019-11-06 21:20:29,025 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:29,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:29,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:29,337 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:29,337 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925920952] [2019-11-06 21:20:29,337 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785118216] [2019-11-06 21:20:29,337 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:30,767 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2019-11-06 21:20:30,767 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:30,770 INFO L256 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-06 21:20:30,771 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:30,784 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:30,784 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:30,784 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2019-11-06 21:20:30,785 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570996542] [2019-11-06 21:20:30,785 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-06 21:20:30,785 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:30,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-06 21:20:30,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-11-06 21:20:30,786 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 26 states. [2019-11-06 21:20:30,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:30,875 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2019-11-06 21:20:30,875 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-06 21:20:30,875 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 54 [2019-11-06 21:20:30,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:30,876 INFO L225 Difference]: With dead ends: 64 [2019-11-06 21:20:30,876 INFO L226 Difference]: Without dead ends: 58 [2019-11-06 21:20:30,877 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-11-06 21:20:30,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-11-06 21:20:30,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2019-11-06 21:20:30,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-11-06 21:20:30,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2019-11-06 21:20:30,881 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2019-11-06 21:20:30,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:30,881 INFO L462 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2019-11-06 21:20:30,881 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-06 21:20:30,881 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2019-11-06 21:20:30,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-11-06 21:20:30,882 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:30,882 INFO L410 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:31,087 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:31,087 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:31,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:31,088 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2019-11-06 21:20:31,088 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:31,088 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675585876] [2019-11-06 21:20:31,089 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:31,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:31,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:31,375 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:31,376 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675585876] [2019-11-06 21:20:31,376 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [718324974] [2019-11-06 21:20:31,376 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:31,442 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:31,443 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:31,444 INFO L256 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-06 21:20:31,445 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:31,464 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:31,465 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:31,465 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2019-11-06 21:20:31,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164489353] [2019-11-06 21:20:31,465 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 21:20:31,466 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:31,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 21:20:31,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 21:20:31,466 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 27 states. [2019-11-06 21:20:31,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:31,594 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2019-11-06 21:20:31,595 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-06 21:20:31,595 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 56 [2019-11-06 21:20:31,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:31,595 INFO L225 Difference]: With dead ends: 66 [2019-11-06 21:20:31,596 INFO L226 Difference]: Without dead ends: 60 [2019-11-06 21:20:31,596 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 21:20:31,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-11-06 21:20:31,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2019-11-06 21:20:31,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-11-06 21:20:31,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2019-11-06 21:20:31,603 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2019-11-06 21:20:31,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:31,603 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2019-11-06 21:20:31,603 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 21:20:31,603 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2019-11-06 21:20:31,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-11-06 21:20:31,604 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:31,604 INFO L410 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:31,807 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:31,807 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:31,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:31,808 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2019-11-06 21:20:31,808 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:31,808 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1356928742] [2019-11-06 21:20:31,809 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:31,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:32,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:32,154 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:32,154 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1356928742] [2019-11-06 21:20:32,155 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1825076865] [2019-11-06 21:20:32,155 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:32,504 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2019-11-06 21:20:32,504 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:32,507 INFO L256 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 25 conjunts are in the unsatisfiable core [2019-11-06 21:20:32,508 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:32,523 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:32,524 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:32,524 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2019-11-06 21:20:32,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070821122] [2019-11-06 21:20:32,524 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-06 21:20:32,525 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:32,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-06 21:20:32,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-11-06 21:20:32,525 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 28 states. [2019-11-06 21:20:32,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:32,663 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2019-11-06 21:20:32,663 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-06 21:20:32,663 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 58 [2019-11-06 21:20:32,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:32,664 INFO L225 Difference]: With dead ends: 68 [2019-11-06 21:20:32,664 INFO L226 Difference]: Without dead ends: 62 [2019-11-06 21:20:32,664 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-11-06 21:20:32,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-11-06 21:20:32,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2019-11-06 21:20:32,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-11-06 21:20:32,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2019-11-06 21:20:32,669 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2019-11-06 21:20:32,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:32,669 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2019-11-06 21:20:32,669 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-06 21:20:32,670 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2019-11-06 21:20:32,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-11-06 21:20:32,670 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:32,670 INFO L410 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:32,875 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:32,875 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:32,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:32,876 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2019-11-06 21:20:32,876 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:32,876 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [79559517] [2019-11-06 21:20:32,876 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:32,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:33,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:33,282 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:33,282 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [79559517] [2019-11-06 21:20:33,282 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647932764] [2019-11-06 21:20:33,282 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:34,648 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2019-11-06 21:20:34,648 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:34,652 INFO L256 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 26 conjunts are in the unsatisfiable core [2019-11-06 21:20:34,654 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:34,669 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:34,669 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:34,669 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2019-11-06 21:20:34,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44476119] [2019-11-06 21:20:34,670 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-06 21:20:34,670 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:34,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-06 21:20:34,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-11-06 21:20:34,671 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 29 states. [2019-11-06 21:20:34,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:34,846 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2019-11-06 21:20:34,847 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-06 21:20:34,847 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 60 [2019-11-06 21:20:34,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:34,848 INFO L225 Difference]: With dead ends: 70 [2019-11-06 21:20:34,848 INFO L226 Difference]: Without dead ends: 64 [2019-11-06 21:20:34,849 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-11-06 21:20:34,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-11-06 21:20:34,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2019-11-06 21:20:34,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2019-11-06 21:20:34,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2019-11-06 21:20:34,851 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2019-11-06 21:20:34,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:34,852 INFO L462 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2019-11-06 21:20:34,852 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-06 21:20:34,852 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2019-11-06 21:20:34,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2019-11-06 21:20:34,853 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:34,853 INFO L410 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:35,057 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:35,058 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:35,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:35,058 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2019-11-06 21:20:35,059 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:35,059 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113386505] [2019-11-06 21:20:35,059 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:35,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:35,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:35,418 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:35,418 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113386505] [2019-11-06 21:20:35,419 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [552853829] [2019-11-06 21:20:35,419 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:35,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:35,520 INFO L256 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 27 conjunts are in the unsatisfiable core [2019-11-06 21:20:35,522 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:35,561 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:35,562 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:35,562 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2019-11-06 21:20:35,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492216374] [2019-11-06 21:20:35,562 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-06 21:20:35,563 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:35,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-06 21:20:35,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-11-06 21:20:35,564 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 30 states. [2019-11-06 21:20:35,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:35,731 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2019-11-06 21:20:35,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-06 21:20:35,731 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 62 [2019-11-06 21:20:35,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:35,732 INFO L225 Difference]: With dead ends: 72 [2019-11-06 21:20:35,732 INFO L226 Difference]: Without dead ends: 66 [2019-11-06 21:20:35,733 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-11-06 21:20:35,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-11-06 21:20:35,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2019-11-06 21:20:35,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-11-06 21:20:35,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2019-11-06 21:20:35,736 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2019-11-06 21:20:35,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:35,737 INFO L462 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2019-11-06 21:20:35,737 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-06 21:20:35,737 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2019-11-06 21:20:35,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-11-06 21:20:35,737 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:35,738 INFO L410 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:35,941 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:35,941 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:35,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:35,942 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2019-11-06 21:20:35,942 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:35,943 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686971920] [2019-11-06 21:20:35,943 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:35,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:36,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:36,325 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:36,326 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686971920] [2019-11-06 21:20:36,326 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160851984] [2019-11-06 21:20:36,326 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:36,427 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:36,427 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:36,429 INFO L256 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 28 conjunts are in the unsatisfiable core [2019-11-06 21:20:36,431 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:36,459 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:36,459 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:36,459 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2019-11-06 21:20:36,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313468046] [2019-11-06 21:20:36,460 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-06 21:20:36,460 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:36,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-06 21:20:36,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-11-06 21:20:36,461 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 31 states. [2019-11-06 21:20:36,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:36,640 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2019-11-06 21:20:36,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-11-06 21:20:36,640 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 64 [2019-11-06 21:20:36,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:36,641 INFO L225 Difference]: With dead ends: 74 [2019-11-06 21:20:36,641 INFO L226 Difference]: Without dead ends: 68 [2019-11-06 21:20:36,642 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-11-06 21:20:36,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-11-06 21:20:36,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2019-11-06 21:20:36,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-11-06 21:20:36,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2019-11-06 21:20:36,646 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2019-11-06 21:20:36,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:36,646 INFO L462 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2019-11-06 21:20:36,646 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-06 21:20:36,646 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2019-11-06 21:20:36,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2019-11-06 21:20:36,647 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:36,647 INFO L410 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:36,851 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:36,851 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:36,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:36,852 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2019-11-06 21:20:36,852 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:36,853 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [565861712] [2019-11-06 21:20:36,853 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:36,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:37,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:37,250 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:37,250 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [565861712] [2019-11-06 21:20:37,250 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933121896] [2019-11-06 21:20:37,250 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:43,169 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2019-11-06 21:20:43,169 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:43,174 INFO L256 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 29 conjunts are in the unsatisfiable core [2019-11-06 21:20:43,175 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:43,191 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:43,191 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:43,191 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2019-11-06 21:20:43,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258953400] [2019-11-06 21:20:43,192 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-11-06 21:20:43,192 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:43,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-11-06 21:20:43,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2019-11-06 21:20:43,193 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 32 states. [2019-11-06 21:20:43,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:43,334 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2019-11-06 21:20:43,335 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-06 21:20:43,335 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 66 [2019-11-06 21:20:43,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:43,336 INFO L225 Difference]: With dead ends: 76 [2019-11-06 21:20:43,336 INFO L226 Difference]: Without dead ends: 70 [2019-11-06 21:20:43,336 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2019-11-06 21:20:43,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-11-06 21:20:43,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2019-11-06 21:20:43,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2019-11-06 21:20:43,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2019-11-06 21:20:43,340 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2019-11-06 21:20:43,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:43,340 INFO L462 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2019-11-06 21:20:43,340 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-11-06 21:20:43,340 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2019-11-06 21:20:43,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-11-06 21:20:43,341 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:43,341 INFO L410 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:43,541 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:43,542 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:43,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:43,543 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2019-11-06 21:20:43,543 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:43,543 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397868419] [2019-11-06 21:20:43,544 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:43,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:43,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:43,936 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:43,936 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397868419] [2019-11-06 21:20:43,937 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [79239147] [2019-11-06 21:20:43,937 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:44,012 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:20:44,012 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:44,013 INFO L256 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 30 conjunts are in the unsatisfiable core [2019-11-06 21:20:44,015 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:44,034 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:44,035 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:44,035 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2019-11-06 21:20:44,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821293011] [2019-11-06 21:20:44,035 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-06 21:20:44,036 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:44,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-06 21:20:44,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 21:20:44,037 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 33 states. [2019-11-06 21:20:44,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:44,180 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2019-11-06 21:20:44,180 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-11-06 21:20:44,181 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 68 [2019-11-06 21:20:44,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:44,182 INFO L225 Difference]: With dead ends: 78 [2019-11-06 21:20:44,182 INFO L226 Difference]: Without dead ends: 72 [2019-11-06 21:20:44,183 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 21:20:44,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2019-11-06 21:20:44,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2019-11-06 21:20:44,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2019-11-06 21:20:44,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2019-11-06 21:20:44,187 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2019-11-06 21:20:44,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:44,187 INFO L462 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2019-11-06 21:20:44,187 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-06 21:20:44,188 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2019-11-06 21:20:44,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2019-11-06 21:20:44,188 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:44,188 INFO L410 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:44,391 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:44,392 INFO L410 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:44,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:44,392 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2019-11-06 21:20:44,393 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:44,393 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [645417774] [2019-11-06 21:20:44,393 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:44,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:44,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:44,971 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:44,973 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [645417774] [2019-11-06 21:20:44,974 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1454168963] [2019-11-06 21:20:44,974 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:45,558 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2019-11-06 21:20:45,558 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:45,560 INFO L256 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 31 conjunts are in the unsatisfiable core [2019-11-06 21:20:45,561 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:45,574 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:45,574 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:45,574 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2019-11-06 21:20:45,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719296616] [2019-11-06 21:20:45,574 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-11-06 21:20:45,575 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:45,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-11-06 21:20:45,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 21:20:45,575 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 34 states. [2019-11-06 21:20:45,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:45,782 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2019-11-06 21:20:45,783 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-11-06 21:20:45,783 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 70 [2019-11-06 21:20:45,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:45,784 INFO L225 Difference]: With dead ends: 80 [2019-11-06 21:20:45,784 INFO L226 Difference]: Without dead ends: 74 [2019-11-06 21:20:45,785 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 21:20:45,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-11-06 21:20:45,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2019-11-06 21:20:45,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-11-06 21:20:45,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2019-11-06 21:20:45,789 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2019-11-06 21:20:45,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:45,789 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2019-11-06 21:20:45,789 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-11-06 21:20:45,789 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2019-11-06 21:20:45,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-11-06 21:20:45,790 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:45,790 INFO L410 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:45,995 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:45,995 INFO L410 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:45,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:45,996 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2019-11-06 21:20:45,996 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:45,996 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [125636880] [2019-11-06 21:20:45,996 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:46,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:46,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:46,425 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:46,425 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [125636880] [2019-11-06 21:20:46,425 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [516898310] [2019-11-06 21:20:46,425 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:53,567 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2019-11-06 21:20:53,567 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:53,574 INFO L256 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 32 conjunts are in the unsatisfiable core [2019-11-06 21:20:53,576 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:53,603 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:53,604 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:53,604 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2019-11-06 21:20:53,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506563475] [2019-11-06 21:20:53,604 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-06 21:20:53,604 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:53,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-06 21:20:53,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 21:20:53,606 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 35 states. [2019-11-06 21:20:53,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:53,761 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2019-11-06 21:20:53,761 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-06 21:20:53,761 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 72 [2019-11-06 21:20:53,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:53,762 INFO L225 Difference]: With dead ends: 82 [2019-11-06 21:20:53,762 INFO L226 Difference]: Without dead ends: 76 [2019-11-06 21:20:53,763 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 21:20:53,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-11-06 21:20:53,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2019-11-06 21:20:53,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2019-11-06 21:20:53,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2019-11-06 21:20:53,769 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2019-11-06 21:20:53,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:53,769 INFO L462 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2019-11-06 21:20:53,769 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-06 21:20:53,769 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2019-11-06 21:20:53,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2019-11-06 21:20:53,770 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:53,770 INFO L410 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:53,977 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:53,978 INFO L410 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:53,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:53,978 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2019-11-06 21:20:53,978 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:53,979 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144560618] [2019-11-06 21:20:53,979 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:53,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:54,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:54,444 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:54,444 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1144560618] [2019-11-06 21:20:54,444 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [242368824] [2019-11-06 21:20:54,445 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:54,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:54,536 INFO L256 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 33 conjunts are in the unsatisfiable core [2019-11-06 21:20:54,538 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:54,554 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:54,554 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:54,554 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2019-11-06 21:20:54,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621968578] [2019-11-06 21:20:54,555 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-11-06 21:20:54,555 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:54,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-11-06 21:20:54,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 21:20:54,556 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 36 states. [2019-11-06 21:20:54,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:54,760 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2019-11-06 21:20:54,761 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-11-06 21:20:54,761 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 74 [2019-11-06 21:20:54,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:54,762 INFO L225 Difference]: With dead ends: 84 [2019-11-06 21:20:54,762 INFO L226 Difference]: Without dead ends: 78 [2019-11-06 21:20:54,763 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 21:20:54,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-11-06 21:20:54,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2019-11-06 21:20:54,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-11-06 21:20:54,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2019-11-06 21:20:54,767 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2019-11-06 21:20:54,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:54,768 INFO L462 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2019-11-06 21:20:54,768 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-11-06 21:20:54,768 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2019-11-06 21:20:54,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2019-11-06 21:20:54,768 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:54,768 INFO L410 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:54,972 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:54,972 INFO L410 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:54,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:54,972 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2019-11-06 21:20:54,973 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:54,973 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310503558] [2019-11-06 21:20:54,973 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:54,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:55,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:55,449 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:55,449 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310503558] [2019-11-06 21:20:55,449 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1660716985] [2019-11-06 21:20:55,449 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:55,539 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:20:55,539 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:20:55,541 INFO L256 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 34 conjunts are in the unsatisfiable core [2019-11-06 21:20:55,542 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:20:55,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:55,559 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:20:55,559 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2019-11-06 21:20:55,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232840701] [2019-11-06 21:20:55,560 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-11-06 21:20:55,560 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:20:55,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-11-06 21:20:55,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-11-06 21:20:55,561 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 37 states. [2019-11-06 21:20:55,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:20:55,727 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2019-11-06 21:20:55,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-11-06 21:20:55,728 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 76 [2019-11-06 21:20:55,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:20:55,729 INFO L225 Difference]: With dead ends: 86 [2019-11-06 21:20:55,729 INFO L226 Difference]: Without dead ends: 80 [2019-11-06 21:20:55,730 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-11-06 21:20:55,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2019-11-06 21:20:55,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2019-11-06 21:20:55,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2019-11-06 21:20:55,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2019-11-06 21:20:55,733 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2019-11-06 21:20:55,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:20:55,734 INFO L462 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2019-11-06 21:20:55,734 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-11-06 21:20:55,734 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2019-11-06 21:20:55,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-11-06 21:20:55,734 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:20:55,734 INFO L410 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:20:55,937 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:20:55,938 INFO L410 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:20:55,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:20:55,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2019-11-06 21:20:55,939 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:20:55,939 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [380644639] [2019-11-06 21:20:55,939 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:20:55,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:56,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:20:56,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:20:56,464 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [380644639] [2019-11-06 21:20:56,464 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1767036758] [2019-11-06 21:20:56,464 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true