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_copy4_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:32:34,891 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:32:34,894 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:32:34,906 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-10-15 01:32:34,917 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:32:34,918 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:32:34,919 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:32:34,920 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:32:34,921 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:32:34,922 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:32:34,924 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:32:34,926 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:32:34,928 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:32:34,931 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:32:34,932 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:32:34,933 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:32:34,936 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:32:34,944 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:32:34,945 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:32:34,946 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:32:34,947 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 01:32:34,961 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:32:34,961 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:32:34,962 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:32:34,963 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:32:34,963 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:32:34,963 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:32:34,963 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:32:34,964 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:32:34,964 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:32:34,964 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:32:34,964 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:32:34,964 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:32:34,964 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:32:34,965 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:32:34,965 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:32:34,965 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:32:34,965 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:32:34,965 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:32:34,966 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:32:34,966 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:32:34,966 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:32:34,966 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:32:34,966 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:32:34,967 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:32:34,967 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:32:34,967 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:32:34,967 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:32:34,967 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:32:34,968 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 01:32:35,252 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:32:35,270 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:32:35,274 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:32:35,275 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:32:35,276 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:32:35,277 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_copy4_ground-2.i [2019-10-15 01:32:35,356 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c7912a7fb/db0a356ffbd64b8d9fba71c75a5ee272/FLAG728543a54 [2019-10-15 01:32:35,858 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:32:35,859 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_copy4_ground-2.i [2019-10-15 01:32:35,864 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c7912a7fb/db0a356ffbd64b8d9fba71c75a5ee272/FLAG728543a54 [2019-10-15 01:32:36,197 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c7912a7fb/db0a356ffbd64b8d9fba71c75a5ee272 [2019-10-15 01:32:36,208 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:32:36,209 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:32:36,210 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:32:36,210 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:32:36,213 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:32:36,214 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:32:36" (1/1) ... [2019-10-15 01:32:36,217 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@59674e76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:36, skipping insertion in model container [2019-10-15 01:32:36,217 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:32:36" (1/1) ... [2019-10-15 01:32:36,225 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:32:36,245 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:32:36,428 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:32:36,435 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:32:36,464 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:32:36,485 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:32:36,485 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:36 WrapperNode [2019-10-15 01:32:36,485 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:32:36,486 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:32:36,486 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:32:36,486 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:32:36,576 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:36" (1/1) ... [2019-10-15 01:32:36,576 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:36" (1/1) ... [2019-10-15 01:32:36,584 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:36" (1/1) ... [2019-10-15 01:32:36,585 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:36" (1/1) ... [2019-10-15 01:32:36,595 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:36" (1/1) ... [2019-10-15 01:32:36,609 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:36" (1/1) ... [2019-10-15 01:32:36,611 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:36" (1/1) ... [2019-10-15 01:32:36,614 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:32:36,614 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:32:36,614 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:32:36,615 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:32:36,616 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:36" (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 01:32:36,677 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:32:36,678 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:32:36,678 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:32:36,678 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:32:36,678 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:32:36,678 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:32:36,679 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:32:36,679 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:32:36,679 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:32:36,679 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:32:36,679 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:32:36,679 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:32:36,680 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:32:36,680 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:32:37,161 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:32:37,161 INFO L284 CfgBuilder]: Removed 6 assume(true) statements. [2019-10-15 01:32:37,162 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:32:37 BoogieIcfgContainer [2019-10-15 01:32:37,163 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:32:37,164 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:32:37,164 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:32:37,167 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:32:37,168 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:32:36" (1/3) ... [2019-10-15 01:32:37,169 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e8d137 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:32:37, skipping insertion in model container [2019-10-15 01:32:37,169 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:32:36" (2/3) ... [2019-10-15 01:32:37,170 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e8d137 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:32:37, skipping insertion in model container [2019-10-15 01:32:37,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:32:37" (3/3) ... [2019-10-15 01:32:37,172 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_copy4_ground-2.i [2019-10-15 01:32:37,181 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:32:37,189 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:32:37,201 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:32:37,221 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:32:37,222 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:32:37,222 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:32:37,222 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:32:37,222 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:32:37,222 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:32:37,223 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:32:37,223 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:32:37,236 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-10-15 01:32:37,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-15 01:32:37,243 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:37,244 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:37,246 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:37,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:37,252 INFO L82 PathProgramCache]: Analyzing trace with hash 1907873763, now seen corresponding path program 1 times [2019-10-15 01:32:37,259 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:37,259 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1974346297] [2019-10-15 01:32:37,260 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:37,260 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:37,260 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:37,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:37,433 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 01:32:37,434 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1974346297] [2019-10-15 01:32:37,436 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:32:37,436 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:32:37,437 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516951211] [2019-10-15 01:32:37,442 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:32:37,442 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:37,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:32:37,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:32:37,460 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 3 states. [2019-10-15 01:32:37,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:37,493 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2019-10-15 01:32:37,494 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:32:37,495 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-10-15 01:32:37,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:37,503 INFO L225 Difference]: With dead ends: 39 [2019-10-15 01:32:37,503 INFO L226 Difference]: Without dead ends: 20 [2019-10-15 01:32:37,507 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 01:32:37,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-15 01:32:37,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-15 01:32:37,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-15 01:32:37,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2019-10-15 01:32:37,544 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 15 [2019-10-15 01:32:37,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:37,545 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2019-10-15 01:32:37,545 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:32:37,545 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2019-10-15 01:32:37,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-15 01:32:37,546 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:37,546 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:37,547 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:37,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:37,547 INFO L82 PathProgramCache]: Analyzing trace with hash 309375907, now seen corresponding path program 1 times [2019-10-15 01:32:37,548 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:37,548 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306837581] [2019-10-15 01:32:37,548 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:37,549 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:37,549 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:37,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:37,607 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 01:32:37,608 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1306837581] [2019-10-15 01:32:37,611 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:32:37,611 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:32:37,612 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83999131] [2019-10-15 01:32:37,613 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:32:37,613 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:37,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:32:37,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:32:37,614 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand 3 states. [2019-10-15 01:32:37,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:37,665 INFO L93 Difference]: Finished difference Result 36 states and 48 transitions. [2019-10-15 01:32:37,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:32:37,666 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-10-15 01:32:37,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:37,667 INFO L225 Difference]: With dead ends: 36 [2019-10-15 01:32:37,667 INFO L226 Difference]: Without dead ends: 24 [2019-10-15 01:32:37,669 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 01:32:37,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-15 01:32:37,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-10-15 01:32:37,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-15 01:32:37,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2019-10-15 01:32:37,679 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 16 [2019-10-15 01:32:37,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:37,680 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2019-10-15 01:32:37,680 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:32:37,680 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2019-10-15 01:32:37,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-15 01:32:37,682 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:37,682 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:37,683 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:37,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:37,684 INFO L82 PathProgramCache]: Analyzing trace with hash -1949160451, now seen corresponding path program 1 times [2019-10-15 01:32:37,684 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:37,685 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [10620538] [2019-10-15 01:32:37,686 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:37,686 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:37,686 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:37,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:37,807 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:32:37,807 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [10620538] [2019-10-15 01:32:37,808 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1010663008] [2019-10-15 01:32:37,808 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 01:32:37,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:37,881 INFO L256 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:32:37,888 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:37,940 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:32:37,941 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:37,990 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:32:37,990 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [692620293] [2019-10-15 01:32:38,039 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:32:38,039 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:38,047 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:38,055 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:38,056 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:38,232 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:38,746 WARN L191 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-10-15 01:32:39,046 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-10-15 01:32:39,642 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:39,663 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:39,669 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:40,073 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:40,073 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-10-15 01:32:40,074 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620397414] [2019-10-15 01:32:40,075 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-15 01:32:40,075 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:40,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-15 01:32:40,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2019-10-15 01:32:40,083 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 18 states. [2019-10-15 01:32:40,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:40,790 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2019-10-15 01:32:40,791 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-15 01:32:40,791 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 20 [2019-10-15 01:32:40,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:40,792 INFO L225 Difference]: With dead ends: 57 [2019-10-15 01:32:40,792 INFO L226 Difference]: Without dead ends: 40 [2019-10-15 01:32:40,794 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 48 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 01:32:40,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-10-15 01:32:40,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 31. [2019-10-15 01:32:40,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-15 01:32:40,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2019-10-15 01:32:40,802 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 20 [2019-10-15 01:32:40,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:40,803 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2019-10-15 01:32:40,803 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-15 01:32:40,803 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2019-10-15 01:32:40,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-15 01:32:40,804 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:40,804 INFO L380 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:41,008 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:41,008 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:41,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:41,009 INFO L82 PathProgramCache]: Analyzing trace with hash -519859613, now seen corresponding path program 2 times [2019-10-15 01:32:41,010 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:41,010 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [749873733] [2019-10-15 01:32:41,011 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:41,011 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:41,011 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:41,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:41,133 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:32:41,133 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [749873733] [2019-10-15 01:32:41,134 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302232125] [2019-10-15 01:32:41,134 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 01:32:41,214 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:32:41,215 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:41,216 INFO L256 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:32:41,219 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:41,261 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2019-10-15 01:32:41,262 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:41,291 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2019-10-15 01:32:41,292 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1395118731] [2019-10-15 01:32:41,293 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:32:41,294 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:41,294 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:41,294 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:41,295 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:41,320 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:42,337 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:42,345 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:42,349 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:42,660 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:42,660 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5, 11] total 23 [2019-10-15 01:32:42,660 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112341412] [2019-10-15 01:32:42,662 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-15 01:32:42,662 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:42,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-15 01:32:42,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2019-10-15 01:32:42,664 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand 23 states. [2019-10-15 01:32:43,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:43,814 INFO L93 Difference]: Finished difference Result 78 states and 104 transitions. [2019-10-15 01:32:43,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-15 01:32:43,815 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 27 [2019-10-15 01:32:43,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:43,818 INFO L225 Difference]: With dead ends: 78 [2019-10-15 01:32:43,818 INFO L226 Difference]: Without dead ends: 57 [2019-10-15 01:32:43,819 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=237, Invalid=1403, Unknown=0, NotChecked=0, Total=1640 [2019-10-15 01:32:43,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-10-15 01:32:43,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 48. [2019-10-15 01:32:43,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-10-15 01:32:43,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2019-10-15 01:32:43,838 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2019-10-15 01:32:43,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:43,839 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2019-10-15 01:32:43,839 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-15 01:32:43,839 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2019-10-15 01:32:43,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-15 01:32:43,842 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:43,842 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:44,046 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:44,047 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:44,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:44,048 INFO L82 PathProgramCache]: Analyzing trace with hash -122686685, now seen corresponding path program 3 times [2019-10-15 01:32:44,048 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:44,048 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108844215] [2019-10-15 01:32:44,049 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:44,049 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:44,049 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:44,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:44,271 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-10-15 01:32:44,272 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108844215] [2019-10-15 01:32:44,272 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [745522344] [2019-10-15 01:32:44,272 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 01:32:44,383 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:32:44,388 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:44,390 INFO L256 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-15 01:32:44,394 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:44,447 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-10-15 01:32:44,447 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:44,556 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-10-15 01:32:44,556 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1343017359] [2019-10-15 01:32:44,558 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:32:44,558 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:44,559 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:44,559 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:44,559 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:44,587 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:45,445 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:45,453 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:45,456 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:45,772 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:45,773 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8, 11] total 31 [2019-10-15 01:32:45,773 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046522737] [2019-10-15 01:32:45,774 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-15 01:32:45,774 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:45,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-15 01:32:45,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=775, Unknown=0, NotChecked=0, Total=930 [2019-10-15 01:32:45,776 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 31 states. [2019-10-15 01:32:47,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:47,051 INFO L93 Difference]: Finished difference Result 105 states and 125 transitions. [2019-10-15 01:32:47,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-10-15 01:32:47,052 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 44 [2019-10-15 01:32:47,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:47,054 INFO L225 Difference]: With dead ends: 105 [2019-10-15 01:32:47,054 INFO L226 Difference]: Without dead ends: 68 [2019-10-15 01:32:47,056 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 789 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=473, Invalid=2719, Unknown=0, NotChecked=0, Total=3192 [2019-10-15 01:32:47,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-10-15 01:32:47,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 59. [2019-10-15 01:32:47,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-10-15 01:32:47,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 64 transitions. [2019-10-15 01:32:47,068 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 64 transitions. Word has length 44 [2019-10-15 01:32:47,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:47,069 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 64 transitions. [2019-10-15 01:32:47,069 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-15 01:32:47,069 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 64 transitions. [2019-10-15 01:32:47,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-15 01:32:47,070 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:47,071 INFO L380 BasicCegarLoop]: trace histogram [12, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:47,274 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:47,274 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:47,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:47,275 INFO L82 PathProgramCache]: Analyzing trace with hash 444261821, now seen corresponding path program 4 times [2019-10-15 01:32:47,275 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:47,276 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575472646] [2019-10-15 01:32:47,276 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:47,276 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:47,277 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:47,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:47,464 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-10-15 01:32:47,464 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575472646] [2019-10-15 01:32:47,464 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1236649817] [2019-10-15 01:32:47,465 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 01:32:47,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:47,590 INFO L256 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-15 01:32:47,594 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:47,746 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-10-15 01:32:47,747 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:48,018 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-10-15 01:32:48,019 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1455902075] [2019-10-15 01:32:48,020 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:32:48,020 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:48,021 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:48,021 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:48,021 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:48,042 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:48,924 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:48,930 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:48,933 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:49,299 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:49,300 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15, 15, 11] total 46 [2019-10-15 01:32:49,300 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598015288] [2019-10-15 01:32:49,301 INFO L442 AbstractCegarLoop]: Interpolant automaton has 46 states [2019-10-15 01:32:49,301 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:49,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2019-10-15 01:32:49,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=1619, Unknown=0, NotChecked=0, Total=2070 [2019-10-15 01:32:49,303 INFO L87 Difference]: Start difference. First operand 59 states and 64 transitions. Second operand 46 states. [2019-10-15 01:32:51,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:51,223 INFO L93 Difference]: Finished difference Result 127 states and 154 transitions. [2019-10-15 01:32:51,224 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-10-15 01:32:51,225 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 55 [2019-10-15 01:32:51,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:51,227 INFO L225 Difference]: With dead ends: 127 [2019-10-15 01:32:51,227 INFO L226 Difference]: Without dead ends: 86 [2019-10-15 01:32:51,231 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1839 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1363, Invalid=6119, Unknown=0, NotChecked=0, Total=7482 [2019-10-15 01:32:51,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2019-10-15 01:32:51,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 77. [2019-10-15 01:32:51,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-10-15 01:32:51,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2019-10-15 01:32:51,243 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 55 [2019-10-15 01:32:51,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:51,243 INFO L462 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2019-10-15 01:32:51,244 INFO L463 AbstractCegarLoop]: Interpolant automaton has 46 states. [2019-10-15 01:32:51,244 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2019-10-15 01:32:51,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2019-10-15 01:32:51,245 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:51,245 INFO L380 BasicCegarLoop]: trace histogram [26, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:51,450 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:51,450 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:51,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:51,451 INFO L82 PathProgramCache]: Analyzing trace with hash -1175045661, now seen corresponding path program 5 times [2019-10-15 01:32:51,451 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:51,452 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1375050104] [2019-10-15 01:32:51,452 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:51,452 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:51,452 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:51,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:51,695 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2019-10-15 01:32:51,696 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1375050104] [2019-10-15 01:32:51,696 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056672594] [2019-10-15 01:32:51,696 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 01:32:55,150 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-10-15 01:32:55,150 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:55,155 INFO L256 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 23 conjunts are in the unsatisfiable core [2019-10-15 01:32:55,159 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:55,193 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2019-10-15 01:32:55,193 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:32:55,315 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 52 refuted. 0 times theorem prover too weak. 443 trivial. 0 not checked. [2019-10-15 01:32:55,316 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1708172199] [2019-10-15 01:32:55,317 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:32:55,317 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:32:55,318 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:32:55,318 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:32:55,318 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:32:55,331 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:32:56,105 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:32:56,110 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:32:56,113 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:32:56,385 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:32:56,386 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 31 [2019-10-15 01:32:56,386 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179526990] [2019-10-15 01:32:56,388 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-15 01:32:56,388 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:32:56,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-15 01:32:56,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=690, Unknown=0, NotChecked=0, Total=930 [2019-10-15 01:32:56,389 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand 31 states. [2019-10-15 01:32:57,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:32:57,806 INFO L93 Difference]: Finished difference Result 162 states and 210 transitions. [2019-10-15 01:32:57,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-10-15 01:32:57,807 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 73 [2019-10-15 01:32:57,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:32:57,809 INFO L225 Difference]: With dead ends: 162 [2019-10-15 01:32:57,810 INFO L226 Difference]: Without dead ends: 126 [2019-10-15 01:32:57,811 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 219 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 809 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=736, Invalid=2456, Unknown=0, NotChecked=0, Total=3192 [2019-10-15 01:32:57,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2019-10-15 01:32:57,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 117. [2019-10-15 01:32:57,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2019-10-15 01:32:57,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 122 transitions. [2019-10-15 01:32:57,827 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 122 transitions. Word has length 73 [2019-10-15 01:32:57,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:32:57,828 INFO L462 AbstractCegarLoop]: Abstraction has 117 states and 122 transitions. [2019-10-15 01:32:57,828 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-15 01:32:57,828 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 122 transitions. [2019-10-15 01:32:57,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2019-10-15 01:32:57,830 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:32:57,830 INFO L380 BasicCegarLoop]: trace histogram [26, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:32:58,031 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:32:58,031 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:32:58,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:32:58,032 INFO L82 PathProgramCache]: Analyzing trace with hash -1972973981, now seen corresponding path program 6 times [2019-10-15 01:32:58,032 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:32:58,032 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139471736] [2019-10-15 01:32:58,033 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:58,033 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:32:58,033 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:32:58,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:32:58,622 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 864 trivial. 0 not checked. [2019-10-15 01:32:58,623 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139471736] [2019-10-15 01:32:58,623 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1515576598] [2019-10-15 01:32:58,623 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 01:32:58,808 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:32:58,808 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:32:58,810 INFO L256 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-15 01:32:58,815 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:32:59,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2019-10-15 01:32:59,455 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:33:00,502 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2019-10-15 01:33:00,503 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1763388510] [2019-10-15 01:33:00,504 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:33:00,504 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:33:00,504 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:33:00,505 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:33:00,505 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:33:00,539 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:33:00,993 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-10-15 01:33:01,445 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:33:01,450 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:33:01,453 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:33:01,924 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:33:01,925 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 29, 29, 11] total 85 [2019-10-15 01:33:01,925 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822806973] [2019-10-15 01:33:01,927 INFO L442 AbstractCegarLoop]: Interpolant automaton has 85 states [2019-10-15 01:33:01,927 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:33:01,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2019-10-15 01:33:01,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1778, Invalid=5362, Unknown=0, NotChecked=0, Total=7140 [2019-10-15 01:33:01,930 INFO L87 Difference]: Start difference. First operand 117 states and 122 transitions. Second operand 85 states. [2019-10-15 01:33:06,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:33:06,692 INFO L93 Difference]: Finished difference Result 243 states and 284 transitions. [2019-10-15 01:33:06,692 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2019-10-15 01:33:06,692 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 113 [2019-10-15 01:33:06,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:33:06,694 INFO L225 Difference]: With dead ends: 243 [2019-10-15 01:33:06,694 INFO L226 Difference]: Without dead ends: 158 [2019-10-15 01:33:06,701 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 297 SyntacticMatches, 0 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6399 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=5366, Invalid=21694, Unknown=0, NotChecked=0, Total=27060 [2019-10-15 01:33:06,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2019-10-15 01:33:06,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 149. [2019-10-15 01:33:06,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2019-10-15 01:33:06,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 154 transitions. [2019-10-15 01:33:06,724 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 154 transitions. Word has length 113 [2019-10-15 01:33:06,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:33:06,725 INFO L462 AbstractCegarLoop]: Abstraction has 149 states and 154 transitions. [2019-10-15 01:33:06,725 INFO L463 AbstractCegarLoop]: Interpolant automaton has 85 states. [2019-10-15 01:33:06,725 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 154 transitions. [2019-10-15 01:33:06,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2019-10-15 01:33:06,728 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:33:06,728 INFO L380 BasicCegarLoop]: trace histogram [54, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:33:06,945 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:33:06,945 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:33:06,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:33:06,946 INFO L82 PathProgramCache]: Analyzing trace with hash -95848259, now seen corresponding path program 7 times [2019-10-15 01:33:06,947 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:33:06,947 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2104366429] [2019-10-15 01:33:06,947 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:06,947 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:33:06,948 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:33:07,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:07,516 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 2055 trivial. 0 not checked. [2019-10-15 01:33:07,517 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2104366429] [2019-10-15 01:33:07,517 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1569655420] [2019-10-15 01:33:07,517 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 01:33:07,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:33:07,758 INFO L256 TraceCheckSpWp]: Trace formula consists of 825 conjuncts, 56 conjunts are in the unsatisfiable core [2019-10-15 01:33:07,763 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:33:09,341 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2019-10-15 01:33:09,342 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:33:13,120 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2019-10-15 01:33:13,120 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1824172028] [2019-10-15 01:33:13,121 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:33:13,122 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:33:13,122 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:33:13,122 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:33:13,122 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:33:13,140 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 01:33:14,029 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 01:33:14,034 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 01:33:14,040 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:33:14,684 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:33:14,685 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 57, 57, 11] total 142 [2019-10-15 01:33:14,685 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090391808] [2019-10-15 01:33:14,686 INFO L442 AbstractCegarLoop]: Interpolant automaton has 142 states [2019-10-15 01:33:14,687 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:33:14,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2019-10-15 01:33:14,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6475, Invalid=13547, Unknown=0, NotChecked=0, Total=20022 [2019-10-15 01:33:14,691 INFO L87 Difference]: Start difference. First operand 149 states and 154 transitions. Second operand 142 states.