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 --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-examples/standard_copy3_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:32:32,771 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:32:32,773 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:32:32,785 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-10-15 01:32:32,795 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:32:32,796 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:32:32,797 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:32:32,798 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:32:32,799 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:32:32,800 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:32:32,802 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:32:32,804 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:32:32,805 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:32:32,806 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:32:32,807 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:32:32,808 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:32:32,810 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:32:32,817 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:32:32,818 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:32:32,819 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:32:32,820 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-15 01:32:32,834 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:32:32,835 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:32:32,836 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:32:32,836 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:32:32,836 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:32:32,837 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:32:32,837 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:32:32,837 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:32:32,837 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:32:32,838 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:32:32,838 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:32:32,838 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:32:32,838 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:32:32,839 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:32:32,839 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:32:32,839 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:32:32,839 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:32:32,840 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:32:32,840 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:32:32,840 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:32:32,840 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:32:32,841 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:32:32,841 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:32:32,841 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:32:32,841 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:32:32,841 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:32:32,842 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:32:32,842 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:32:32,842 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-10-15 01:32:33,130 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:32:33,143 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:32:33,147 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:32:33,149 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:32:33,149 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:32:33,150 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_copy3_ground-2.i [2019-10-15 01:32:33,214 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7734e32e2/3d28217416d0461e9fd6ff05102d85b3/FLAGf1d93ee2d [2019-10-15 01:32:33,621 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:32:33,622 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_copy3_ground-2.i [2019-10-15 01:32:33,629 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7734e32e2/3d28217416d0461e9fd6ff05102d85b3/FLAGf1d93ee2d [2019-10-15 01:32:34,004 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7734e32e2/3d28217416d0461e9fd6ff05102d85b3 [2019-10-15 01:32:34,017 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:32:34,019 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:32:34,019 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:32:34,020 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:32:34,023 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:32:34,024 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:32:34" (1/1) ... [2019-10-15 01:32:34,027 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ea19e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:34, skipping insertion in model container [2019-10-15 01:32:34,027 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:32:34" (1/1) ... [2019-10-15 01:32:34,035 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:32:34,054 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:32:34,286 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:32:34,297 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:32:34,320 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:32:34,341 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:32:34,341 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:34 WrapperNode [2019-10-15 01:32:34,341 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:32:34,342 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:32:34,342 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:32:34,342 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:32:34,438 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:34" (1/1) ... [2019-10-15 01:32:34,439 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:34" (1/1) ... [2019-10-15 01:32:34,447 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:34" (1/1) ... [2019-10-15 01:32:34,449 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:34" (1/1) ... [2019-10-15 01:32:34,457 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:34" (1/1) ... [2019-10-15 01:32:34,463 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:34" (1/1) ... [2019-10-15 01:32:34,465 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:34" (1/1) ... [2019-10-15 01:32:34,468 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:32:34,469 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:32:34,469 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:32:34,469 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:32:34,470 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:34" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:32:34,527 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:32:34,527 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:32:34,527 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:32:34,527 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:32:34,527 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:32:34,528 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:32:34,528 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:32:34,528 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:32:34,528 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:32:34,528 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:32:34,528 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:32:34,529 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:32:34,529 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:32:34,529 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:32:34,967 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:32:34,967 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-10-15 01:32:34,968 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:32:34 BoogieIcfgContainer [2019-10-15 01:32:34,969 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:32:34,970 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:32:34,970 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:32:34,972 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:32:34,972 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:32:34" (1/3) ... [2019-10-15 01:32:34,973 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ef11d6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:32:34, skipping insertion in model container [2019-10-15 01:32:34,973 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:34" (2/3) ... [2019-10-15 01:32:34,974 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ef11d6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:32:34, skipping insertion in model container [2019-10-15 01:32:34,974 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:32:34" (3/3) ... [2019-10-15 01:32:34,975 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_copy3_ground-2.i [2019-10-15 01:32:34,983 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:32:34,991 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:32:35,002 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:32:35,026 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:32:35,027 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:32:35,027 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:32:35,027 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:32:35,027 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:32:35,027 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:32:35,028 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:32:35,028 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:32:35,042 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2019-10-15 01:32:35,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-15 01:32:35,047 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:35,048 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:35,050 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:35,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:35,056 INFO L82 PathProgramCache]: Analyzing trace with hash -1715360832, now seen corresponding path program 1 times [2019-10-15 01:32:35,066 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:35,066 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563750476] [2019-10-15 01:32:35,066 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:35,067 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:35,067 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:35,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:35,224 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:32:35,225 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563750476] [2019-10-15 01:32:35,226 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:32:35,226 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:32:35,227 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628200015] [2019-10-15 01:32:35,230 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:32:35,230 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:35,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:32:35,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:32:35,244 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2019-10-15 01:32:35,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:35,291 INFO L93 Difference]: Finished difference Result 37 states and 48 transitions. [2019-10-15 01:32:35,292 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:32:35,293 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2019-10-15 01:32:35,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:35,302 INFO L225 Difference]: With dead ends: 37 [2019-10-15 01:32:35,303 INFO L226 Difference]: Without dead ends: 19 [2019-10-15 01:32:35,308 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:32:35,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-10-15 01:32:35,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-10-15 01:32:35,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-10-15 01:32:35,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2019-10-15 01:32:35,342 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 14 [2019-10-15 01:32:35,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:35,344 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2019-10-15 01:32:35,344 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:32:35,344 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2019-10-15 01:32:35,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-15 01:32:35,345 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:35,345 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:35,346 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:35,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:35,347 INFO L82 PathProgramCache]: Analyzing trace with hash 1871332789, now seen corresponding path program 1 times [2019-10-15 01:32:35,347 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:35,347 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56311402] [2019-10-15 01:32:35,347 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:35,347 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:35,348 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:35,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:35,406 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:32:35,407 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56311402] [2019-10-15 01:32:35,407 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:32:35,407 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:32:35,408 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794845145] [2019-10-15 01:32:35,409 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:32:35,410 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:35,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:32:35,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:32:35,411 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand 3 states. [2019-10-15 01:32:35,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:35,458 INFO L93 Difference]: Finished difference Result 33 states and 42 transitions. [2019-10-15 01:32:35,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:32:35,458 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-10-15 01:32:35,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:35,460 INFO L225 Difference]: With dead ends: 33 [2019-10-15 01:32:35,460 INFO L226 Difference]: Without dead ends: 22 [2019-10-15 01:32:35,461 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:32:35,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-15 01:32:35,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-15 01:32:35,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-15 01:32:35,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2019-10-15 01:32:35,468 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 15 [2019-10-15 01:32:35,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:35,468 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2019-10-15 01:32:35,469 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:32:35,469 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2019-10-15 01:32:35,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-15 01:32:35,470 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:35,470 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:35,470 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:35,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:35,471 INFO L82 PathProgramCache]: Analyzing trace with hash -313466217, now seen corresponding path program 1 times [2019-10-15 01:32:35,471 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:35,472 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273537135] [2019-10-15 01:32:35,472 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:35,472 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:35,473 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:35,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:35,569 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:32:35,570 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273537135] [2019-10-15 01:32:35,570 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [389393316] [2019-10-15 01:32:35,570 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:35,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:35,636 INFO L256 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:32:35,644 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:35,695 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:32:35,695 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:35,735 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:32:35,735 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1214899673] [2019-10-15 01:32:35,758 INFO L162 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-10-15 01:32:35,759 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:35,766 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:35,774 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:35,775 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:35,959 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:36,441 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-10-15 01:32:37,048 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:37,061 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:37,068 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:37,483 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:37,483 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-10-15 01:32:37,483 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123823181] [2019-10-15 01:32:37,486 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-15 01:32:37,487 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:37,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-15 01:32:37,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2019-10-15 01:32:37,490 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 18 states. [2019-10-15 01:32:38,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:38,179 INFO L93 Difference]: Finished difference Result 52 states and 65 transitions. [2019-10-15 01:32:38,181 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-15 01:32:38,181 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 18 [2019-10-15 01:32:38,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:38,183 INFO L225 Difference]: With dead ends: 52 [2019-10-15 01:32:38,183 INFO L226 Difference]: Without dead ends: 37 [2019-10-15 01:32:38,184 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=145, Invalid=785, Unknown=0, NotChecked=0, Total=930 [2019-10-15 01:32:38,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-15 01:32:38,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 28. [2019-10-15 01:32:38,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-15 01:32:38,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2019-10-15 01:32:38,198 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 18 [2019-10-15 01:32:38,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:38,198 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2019-10-15 01:32:38,199 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-15 01:32:38,199 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2019-10-15 01:32:38,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-10-15 01:32:38,200 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:38,201 INFO L380 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:38,406 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:38,407 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:38,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:38,408 INFO L82 PathProgramCache]: Analyzing trace with hash 1940789760, now seen corresponding path program 2 times [2019-10-15 01:32:38,408 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:38,408 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [929824009] [2019-10-15 01:32:38,409 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:38,409 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:38,409 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:38,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:38,521 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-15 01:32:38,522 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [929824009] [2019-10-15 01:32:38,522 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1003613435] [2019-10-15 01:32:38,522 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 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:38,580 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:32:38,580 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:38,582 INFO L256 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:32:38,584 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:38,597 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-15 01:32:38,597 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:38,626 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-15 01:32:38,626 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1281561935] [2019-10-15 01:32:38,628 INFO L162 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-10-15 01:32:38,628 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:38,629 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:38,629 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:38,630 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:38,669 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:39,465 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-10-15 01:32:39,554 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:39,564 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:39,572 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:39,861 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:39,861 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 11] total 19 [2019-10-15 01:32:39,861 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537642380] [2019-10-15 01:32:39,862 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-15 01:32:39,863 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:39,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-15 01:32:39,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2019-10-15 01:32:39,863 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 19 states. [2019-10-15 01:32:40,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:40,542 INFO L93 Difference]: Finished difference Result 64 states and 82 transitions. [2019-10-15 01:32:40,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-15 01:32:40,543 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 24 [2019-10-15 01:32:40,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:40,544 INFO L225 Difference]: With dead ends: 64 [2019-10-15 01:32:40,544 INFO L226 Difference]: Without dead ends: 49 [2019-10-15 01:32:40,545 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=186, Invalid=806, Unknown=0, NotChecked=0, Total=992 [2019-10-15 01:32:40,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-10-15 01:32:40,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 40. [2019-10-15 01:32:40,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-15 01:32:40,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2019-10-15 01:32:40,556 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 24 [2019-10-15 01:32:40,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:40,557 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2019-10-15 01:32:40,557 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-15 01:32:40,557 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2019-10-15 01:32:40,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-10-15 01:32:40,559 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:40,559 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:40,762 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:40,763 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:40,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:40,764 INFO L82 PathProgramCache]: Analyzing trace with hash 2133601280, now seen corresponding path program 3 times [2019-10-15 01:32:40,764 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:40,764 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [639416289] [2019-10-15 01:32:40,764 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:40,765 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:40,765 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:40,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:41,020 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2019-10-15 01:32:41,021 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [639416289] [2019-10-15 01:32:41,021 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [421427468] [2019-10-15 01:32:41,021 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 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:41,114 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:32:41,120 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:41,121 INFO L256 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-15 01:32:41,127 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:41,188 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2019-10-15 01:32:41,189 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:41,258 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2019-10-15 01:32:41,259 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [141187555] [2019-10-15 01:32:41,260 INFO L162 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-10-15 01:32:41,260 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:41,261 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:41,261 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:41,261 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:41,283 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:41,945 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:41,953 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:41,956 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:42,304 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:42,305 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7, 11] total 29 [2019-10-15 01:32:42,305 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424182046] [2019-10-15 01:32:42,307 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-15 01:32:42,307 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:42,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-15 01:32:42,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=682, Unknown=0, NotChecked=0, Total=812 [2019-10-15 01:32:42,308 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 29 states. [2019-10-15 01:32:43,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:43,605 INFO L93 Difference]: Finished difference Result 88 states and 104 transitions. [2019-10-15 01:32:43,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-15 01:32:43,605 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2019-10-15 01:32:43,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:43,606 INFO L225 Difference]: With dead ends: 88 [2019-10-15 01:32:43,607 INFO L226 Difference]: Without dead ends: 58 [2019-10-15 01:32:43,610 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=398, Invalid=2358, Unknown=0, NotChecked=0, Total=2756 [2019-10-15 01:32:43,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-10-15 01:32:43,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 49. [2019-10-15 01:32:43,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-10-15 01:32:43,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2019-10-15 01:32:43,620 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 36 [2019-10-15 01:32:43,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:43,621 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2019-10-15 01:32:43,621 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-15 01:32:43,621 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2019-10-15 01:32:43,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-10-15 01:32:43,622 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:43,622 INFO L380 BasicCegarLoop]: trace histogram [10, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:43,831 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:43,832 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:43,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:43,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1182805644, now seen corresponding path program 4 times [2019-10-15 01:32:43,834 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:43,835 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879655611] [2019-10-15 01:32:43,835 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:43,835 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:43,835 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:43,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:44,031 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-10-15 01:32:44,032 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879655611] [2019-10-15 01:32:44,032 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [799917636] [2019-10-15 01:32:44,032 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 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:44,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:44,141 INFO L256 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-15 01:32:44,154 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:44,180 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-10-15 01:32:44,181 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:44,384 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-10-15 01:32:44,385 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [849302660] [2019-10-15 01:32:44,387 INFO L162 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-10-15 01:32:44,387 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:44,387 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:44,387 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:44,388 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:44,413 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:45,109 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:45,115 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:45,119 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:45,418 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:45,418 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 11] total 35 [2019-10-15 01:32:45,418 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830682658] [2019-10-15 01:32:45,420 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-15 01:32:45,420 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:45,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-15 01:32:45,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=861, Unknown=0, NotChecked=0, Total=1190 [2019-10-15 01:32:45,422 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand 35 states. [2019-10-15 01:32:46,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:46,620 INFO L93 Difference]: Finished difference Result 103 states and 122 transitions. [2019-10-15 01:32:46,622 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-15 01:32:46,623 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 45 [2019-10-15 01:32:46,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:46,624 INFO L225 Difference]: With dead ends: 103 [2019-10-15 01:32:46,624 INFO L226 Difference]: Without dead ends: 70 [2019-10-15 01:32:46,626 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1029 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=934, Invalid=3098, Unknown=0, NotChecked=0, Total=4032 [2019-10-15 01:32:46,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-10-15 01:32:46,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 61. [2019-10-15 01:32:46,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-10-15 01:32:46,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 65 transitions. [2019-10-15 01:32:46,637 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 65 transitions. Word has length 45 [2019-10-15 01:32:46,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:46,638 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 65 transitions. [2019-10-15 01:32:46,638 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-15 01:32:46,638 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 65 transitions. [2019-10-15 01:32:46,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-10-15 01:32:46,640 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:46,640 INFO L380 BasicCegarLoop]: trace histogram [22, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:46,848 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:46,849 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:46,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:46,850 INFO L82 PathProgramCache]: Analyzing trace with hash 837686988, now seen corresponding path program 5 times [2019-10-15 01:32:46,851 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:46,851 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [69815167] [2019-10-15 01:32:46,852 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:46,852 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:46,852 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:46,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:47,082 INFO L134 CoverageAnalysis]: Checked inductivity of 337 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 309 trivial. 0 not checked. [2019-10-15 01:32:47,083 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [69815167] [2019-10-15 01:32:47,083 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [22243660] [2019-10-15 01:32:47,083 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 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:48,882 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-10-15 01:32:48,883 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:48,887 INFO L256 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-15 01:32:48,890 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:48,928 INFO L134 CoverageAnalysis]: Checked inductivity of 337 backedges. 7 proven. 28 refuted. 0 times theorem prover too weak. 302 trivial. 0 not checked. [2019-10-15 01:32:48,928 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:49,042 INFO L134 CoverageAnalysis]: Checked inductivity of 337 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 309 trivial. 0 not checked. [2019-10-15 01:32:49,042 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [843281855] [2019-10-15 01:32:49,044 INFO L162 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-10-15 01:32:49,044 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:49,044 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:49,045 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:49,045 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:49,064 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:49,742 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:49,749 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:49,753 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:50,025 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:50,026 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 10, 11] total 30 [2019-10-15 01:32:50,026 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847326101] [2019-10-15 01:32:50,028 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-15 01:32:50,028 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:50,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-15 01:32:50,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=651, Unknown=0, NotChecked=0, Total=870 [2019-10-15 01:32:50,029 INFO L87 Difference]: Start difference. First operand 61 states and 65 transitions. Second operand 30 states. [2019-10-15 01:32:51,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:51,233 INFO L93 Difference]: Finished difference Result 122 states and 155 transitions. [2019-10-15 01:32:51,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-10-15 01:32:51,233 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 57 [2019-10-15 01:32:51,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:51,235 INFO L225 Difference]: With dead ends: 122 [2019-10-15 01:32:51,235 INFO L226 Difference]: Without dead ends: 97 [2019-10-15 01:32:51,236 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 709 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=629, Invalid=2127, Unknown=0, NotChecked=0, Total=2756 [2019-10-15 01:32:51,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2019-10-15 01:32:51,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 88. [2019-10-15 01:32:51,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-10-15 01:32:51,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2019-10-15 01:32:51,255 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 57 [2019-10-15 01:32:51,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:51,257 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2019-10-15 01:32:51,257 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-10-15 01:32:51,257 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2019-10-15 01:32:51,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-10-15 01:32:51,259 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:51,259 INFO L380 BasicCegarLoop]: trace histogram [22, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:51,473 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:51,474 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:51,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:51,474 INFO L82 PathProgramCache]: Analyzing trace with hash 1909214368, now seen corresponding path program 6 times [2019-10-15 01:32:51,474 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:51,475 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297743865] [2019-10-15 01:32:51,475 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:51,475 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:51,475 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:51,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:51,923 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 525 trivial. 0 not checked. [2019-10-15 01:32:51,923 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297743865] [2019-10-15 01:32:51,924 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1942290300] [2019-10-15 01:32:51,924 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:52,087 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:32:52,087 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:52,089 INFO L256 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-15 01:32:52,093 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:52,486 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2019-10-15 01:32:52,486 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:53,460 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2019-10-15 01:32:53,460 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [523675375] [2019-10-15 01:32:53,461 INFO L162 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-10-15 01:32:53,461 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:53,462 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:53,462 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:53,462 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:53,481 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:54,154 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:54,161 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:54,164 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:54,895 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:54,895 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 25, 25, 11] total 75 [2019-10-15 01:32:54,896 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262456159] [2019-10-15 01:32:54,897 INFO L442 AbstractCegarLoop]: Interpolant automaton has 75 states [2019-10-15 01:32:54,897 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:54,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2019-10-15 01:32:54,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1327, Invalid=4223, Unknown=0, NotChecked=0, Total=5550 [2019-10-15 01:32:54,901 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand 75 states. [2019-10-15 01:32:59,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:59,238 INFO L93 Difference]: Finished difference Result 184 states and 218 transitions. [2019-10-15 01:32:59,238 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2019-10-15 01:32:59,238 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 84 [2019-10-15 01:32:59,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:59,240 INFO L225 Difference]: With dead ends: 184 [2019-10-15 01:32:59,240 INFO L226 Difference]: Without dead ends: 124 [2019-10-15 01:32:59,246 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4998 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=4009, Invalid=16871, Unknown=0, NotChecked=0, Total=20880 [2019-10-15 01:32:59,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2019-10-15 01:32:59,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 115. [2019-10-15 01:32:59,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2019-10-15 01:32:59,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 119 transitions. [2019-10-15 01:32:59,262 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 119 transitions. Word has length 84 [2019-10-15 01:32:59,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:59,263 INFO L462 AbstractCegarLoop]: Abstraction has 115 states and 119 transitions. [2019-10-15 01:32:59,263 INFO L463 AbstractCegarLoop]: Interpolant automaton has 75 states. [2019-10-15 01:32:59,263 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 119 transitions. [2019-10-15 01:32:59,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2019-10-15 01:32:59,265 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:59,265 INFO L380 BasicCegarLoop]: trace histogram [46, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:59,474 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:59,475 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:59,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:59,475 INFO L82 PathProgramCache]: Analyzing trace with hash 1814523980, now seen corresponding path program 7 times [2019-10-15 01:32:59,475 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:59,475 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [901669299] [2019-10-15 01:32:59,475 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:59,475 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:59,476 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:59,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:00,205 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 1387 trivial. 0 not checked. [2019-10-15 01:33:00,205 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [901669299] [2019-10-15 01:33:00,206 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2102174855] [2019-10-15 01:33:00,206 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:33:00,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:00,421 INFO L256 TraceCheckSpWp]: Trace formula consists of 652 conjuncts, 48 conjunts are in the unsatisfiable core [2019-10-15 01:33:00,426 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:33:01,609 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2019-10-15 01:33:01,609 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:33:04,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2019-10-15 01:33:04,397 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1690956674] [2019-10-15 01:33:04,399 INFO L162 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-10-15 01:33:04,399 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:33:04,399 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:33:04,400 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:33:04,400 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:33:04,423 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:33:04,672 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-10-15 01:33:05,134 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:33:05,140 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:33:05,142 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:33:05,714 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:33:05,715 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 49, 49, 11] total 124 [2019-10-15 01:33:05,715 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075215162] [2019-10-15 01:33:05,716 INFO L442 AbstractCegarLoop]: Interpolant automaton has 124 states [2019-10-15 01:33:05,717 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:33:05,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2019-10-15 01:33:05,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4778, Invalid=10474, Unknown=0, NotChecked=0, Total=15252 [2019-10-15 01:33:05,722 INFO L87 Difference]: Start difference. First operand 115 states and 119 transitions. Second operand 124 states.