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/reducercommutativity/max60-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 03:24:56,877 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 03:24:56,880 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 03:24:56,892 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 03:24:56,892 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 03:24:56,893 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 03:24:56,894 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 03:24:56,896 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 03:24:56,898 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 03:24:56,899 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 03:24:56,900 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 03:24:56,901 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 03:24:56,901 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 03:24:56,902 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 03:24:56,903 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 03:24:56,904 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 03:24:56,905 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 03:24:56,906 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 03:24:56,908 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 03:24:56,910 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 03:24:56,911 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 03:24:56,912 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 03:24:56,913 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 03:24:56,914 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 03:24:56,916 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 03:24:56,930 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 03:24:56,931 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 03:24:56,932 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 03:24:56,932 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 03:24:56,947 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 03:24:56,947 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 03:24:56,948 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 03:24:56,949 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 03:24:56,949 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 03:24:56,949 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 03:24:56,949 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 03:24:56,949 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 03:24:56,950 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 03:24:56,950 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 03:24:56,950 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 03:24:56,950 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 03:24:56,950 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 03:24:56,951 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 03:24:56,951 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 03:24:56,951 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 03:24:56,951 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 03:24:56,951 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 03:24:56,952 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 03:24:56,952 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 03:24:56,952 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 03:24:56,952 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 03:24:56,953 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 03:24:56,953 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 03:24:56,953 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 03:24:56,953 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 03:24:56,953 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 03:24:56,954 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 03:24:56,954 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 03:24:57,261 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 03:24:57,282 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 03:24:57,286 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 03:24:57,287 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 03:24:57,288 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 03:24:57,288 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/reducercommutativity/max60-2.i [2019-10-15 03:24:57,364 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1f08259f2/638f3ab268ee40b3a3516d34c9a90663/FLAG1d10c0680 [2019-10-15 03:24:57,797 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 03:24:57,799 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/reducercommutativity/max60-2.i [2019-10-15 03:24:57,806 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1f08259f2/638f3ab268ee40b3a3516d34c9a90663/FLAG1d10c0680 [2019-10-15 03:24:58,149 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1f08259f2/638f3ab268ee40b3a3516d34c9a90663 [2019-10-15 03:24:58,158 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 03:24:58,159 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 03:24:58,161 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 03:24:58,161 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 03:24:58,164 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 03:24:58,165 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:24:58" (1/1) ... [2019-10-15 03:24:58,168 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@944d793 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:24:58, skipping insertion in model container [2019-10-15 03:24:58,169 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:24:58" (1/1) ... [2019-10-15 03:24:58,176 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 03:24:58,198 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 03:24:58,426 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:24:58,435 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 03:24:58,472 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:24:58,490 INFO L192 MainTranslator]: Completed translation [2019-10-15 03:24:58,490 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:24:58 WrapperNode [2019-10-15 03:24:58,491 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 03:24:58,491 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 03:24:58,492 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 03:24:58,492 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 03:24:58,590 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:24:58" (1/1) ... [2019-10-15 03:24:58,590 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:24:58" (1/1) ... [2019-10-15 03:24:58,601 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:24:58" (1/1) ... [2019-10-15 03:24:58,604 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:24:58" (1/1) ... [2019-10-15 03:24:58,612 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:24:58" (1/1) ... [2019-10-15 03:24:58,621 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:24:58" (1/1) ... [2019-10-15 03:24:58,623 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:24:58" (1/1) ... [2019-10-15 03:24:58,626 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 03:24:58,626 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 03:24:58,626 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 03:24:58,627 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 03:24:58,627 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:24:58" (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 03:24:58,681 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 03:24:58,681 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 03:24:58,682 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2019-10-15 03:24:58,682 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 03:24:58,682 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 03:24:58,682 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 03:24:58,682 INFO L130 BoogieDeclarations]: Found specification of procedure max [2019-10-15 03:24:58,682 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 03:24:58,683 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 03:24:58,683 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 03:24:58,683 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 03:24:58,683 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 03:24:58,683 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 03:24:58,683 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 03:24:59,102 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 03:24:59,102 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-15 03:24:59,104 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:24:59 BoogieIcfgContainer [2019-10-15 03:24:59,104 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 03:24:59,105 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 03:24:59,105 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 03:24:59,108 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 03:24:59,108 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 03:24:58" (1/3) ... [2019-10-15 03:24:59,109 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62d6c4f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:24:59, skipping insertion in model container [2019-10-15 03:24:59,110 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:24:58" (2/3) ... [2019-10-15 03:24:59,110 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62d6c4f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:24:59, skipping insertion in model container [2019-10-15 03:24:59,110 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:24:59" (3/3) ... [2019-10-15 03:24:59,112 INFO L109 eAbstractionObserver]: Analyzing ICFG max60-2.i [2019-10-15 03:24:59,122 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 03:24:59,130 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 03:24:59,142 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 03:24:59,167 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 03:24:59,167 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 03:24:59,167 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 03:24:59,168 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 03:24:59,168 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 03:24:59,168 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 03:24:59,168 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 03:24:59,168 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 03:24:59,185 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2019-10-15 03:24:59,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-10-15 03:24:59,192 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:24:59,193 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:24:59,195 INFO L410 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:24:59,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:24:59,201 INFO L82 PathProgramCache]: Analyzing trace with hash 855740909, now seen corresponding path program 1 times [2019-10-15 03:24:59,209 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:24:59,210 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83515066] [2019-10-15 03:24:59,210 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:24:59,210 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:24:59,210 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:24:59,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:24:59,414 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-15 03:24:59,415 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83515066] [2019-10-15 03:24:59,416 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:24:59,417 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 03:24:59,417 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498841735] [2019-10-15 03:24:59,423 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 03:24:59,424 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:24:59,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 03:24:59,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 03:24:59,438 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 3 states. [2019-10-15 03:24:59,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:24:59,479 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2019-10-15 03:24:59,479 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 03:24:59,481 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2019-10-15 03:24:59,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:24:59,491 INFO L225 Difference]: With dead ends: 41 [2019-10-15 03:24:59,492 INFO L226 Difference]: Without dead ends: 20 [2019-10-15 03:24:59,496 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 03:24:59,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-15 03:24:59,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-15 03:24:59,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-15 03:24:59,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2019-10-15 03:24:59,549 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 24 [2019-10-15 03:24:59,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:24:59,550 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2019-10-15 03:24:59,550 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 03:24:59,550 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2019-10-15 03:24:59,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-15 03:24:59,553 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:24:59,553 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:24:59,553 INFO L410 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:24:59,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:24:59,554 INFO L82 PathProgramCache]: Analyzing trace with hash -1075349738, now seen corresponding path program 1 times [2019-10-15 03:24:59,554 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:24:59,555 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004858394] [2019-10-15 03:24:59,555 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:24:59,555 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:24:59,556 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:24:59,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:24:59,644 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 03:24:59,645 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004858394] [2019-10-15 03:24:59,645 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [384195303] [2019-10-15 03:24:59,646 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 03:24:59,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:24:59,753 INFO L256 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 2 conjunts are in the unsatisfiable core [2019-10-15 03:24:59,763 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:24:59,797 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 03:24:59,797 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:24:59,838 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 03:24:59,838 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 03:24:59,839 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 5 [2019-10-15 03:24:59,839 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672007330] [2019-10-15 03:24:59,841 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 03:24:59,841 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:24:59,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 03:24:59,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-10-15 03:24:59,842 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 3 states. [2019-10-15 03:24:59,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:24:59,869 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2019-10-15 03:24:59,871 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 03:24:59,871 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2019-10-15 03:24:59,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:24:59,872 INFO L225 Difference]: With dead ends: 33 [2019-10-15 03:24:59,873 INFO L226 Difference]: Without dead ends: 21 [2019-10-15 03:24:59,874 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-10-15 03:24:59,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-10-15 03:24:59,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-10-15 03:24:59,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-15 03:24:59,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-10-15 03:24:59,887 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 25 [2019-10-15 03:24:59,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:24:59,888 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-10-15 03:24:59,888 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 03:24:59,889 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-10-15 03:24:59,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 03:24:59,892 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:24:59,892 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:25:00,095 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:25:00,096 INFO L410 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:25:00,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:25:00,097 INFO L82 PathProgramCache]: Analyzing trace with hash 447698074, now seen corresponding path program 1 times [2019-10-15 03:25:00,098 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:25:00,098 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134370140] [2019-10-15 03:25:00,098 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:25:00,099 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:25:00,099 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:25:00,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:25:00,176 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-10-15 03:25:00,177 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134370140] [2019-10-15 03:25:00,177 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:25:00,177 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 03:25:00,177 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375289314] [2019-10-15 03:25:00,178 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 03:25:00,178 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:25:00,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 03:25:00,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 03:25:00,179 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 3 states. [2019-10-15 03:25:00,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:25:00,196 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2019-10-15 03:25:00,197 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 03:25:00,197 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2019-10-15 03:25:00,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:25:00,198 INFO L225 Difference]: With dead ends: 31 [2019-10-15 03:25:00,198 INFO L226 Difference]: Without dead ends: 22 [2019-10-15 03:25:00,199 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 03:25:00,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-15 03:25:00,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-15 03:25:00,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-15 03:25:00,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2019-10-15 03:25:00,205 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 28 [2019-10-15 03:25:00,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:25:00,207 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2019-10-15 03:25:00,208 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 03:25:00,208 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2019-10-15 03:25:00,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-15 03:25:00,209 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:25:00,209 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:25:00,210 INFO L410 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:25:00,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:25:00,210 INFO L82 PathProgramCache]: Analyzing trace with hash -69054062, now seen corresponding path program 1 times [2019-10-15 03:25:00,210 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:25:00,211 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1222700007] [2019-10-15 03:25:00,211 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:25:00,211 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:25:00,211 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:25:00,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:25:00,310 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-10-15 03:25:00,311 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1222700007] [2019-10-15 03:25:00,311 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1349956311] [2019-10-15 03:25:00,311 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 03:25:00,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:25:00,408 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 03:25:00,410 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:25:00,425 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-10-15 03:25:00,425 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:25:00,460 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-10-15 03:25:00,460 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1032583875] [2019-10-15 03:25:00,488 INFO L162 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-10-15 03:25:00,488 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:25:00,494 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:25:00,501 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:25:00,502 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:25:00,680 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:25:02,766 INFO L199 IcfgInterpreter]: Interpreting procedure max with input of size 1 for LOIs [2019-10-15 03:25:02,821 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:25:02,827 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:25:03,182 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:25:03,182 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 17 [2019-10-15 03:25:03,183 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472899258] [2019-10-15 03:25:03,184 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-15 03:25:03,185 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:25:03,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-15 03:25:03,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2019-10-15 03:25:03,187 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 18 states. [2019-10-15 03:25:03,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:25:03,819 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2019-10-15 03:25:03,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-15 03:25:03,820 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 29 [2019-10-15 03:25:03,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:25:03,821 INFO L225 Difference]: With dead ends: 40 [2019-10-15 03:25:03,821 INFO L226 Difference]: Without dead ends: 25 [2019-10-15 03:25:03,822 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=133, Invalid=737, Unknown=0, NotChecked=0, Total=870 [2019-10-15 03:25:03,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-10-15 03:25:03,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-10-15 03:25:03,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-10-15 03:25:03,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2019-10-15 03:25:03,829 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 29 [2019-10-15 03:25:03,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:25:03,829 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2019-10-15 03:25:03,829 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-15 03:25:03,830 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2019-10-15 03:25:03,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-15 03:25:03,831 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:25:03,831 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:25:04,036 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:25:04,037 INFO L410 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:25:04,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:25:04,038 INFO L82 PathProgramCache]: Analyzing trace with hash -493974743, now seen corresponding path program 2 times [2019-10-15 03:25:04,038 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:25:04,038 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219273910] [2019-10-15 03:25:04,038 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:25:04,038 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:25:04,038 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:25:04,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:25:04,164 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-10-15 03:25:04,165 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1219273910] [2019-10-15 03:25:04,165 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [751476058] [2019-10-15 03:25:04,165 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:25:04,252 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 03:25:04,252 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 03:25:04,254 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 03:25:04,263 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:25:04,307 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-15 03:25:04,307 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:25:04,348 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-15 03:25:04,348 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1034089655] [2019-10-15 03:25:04,352 INFO L162 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-10-15 03:25:04,352 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:25:04,353 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:25:04,353 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:25:04,354 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:25:04,391 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:25:06,036 INFO L199 IcfgInterpreter]: Interpreting procedure max with input of size 1 for LOIs [2019-10-15 03:25:06,073 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:25:06,077 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:25:06,460 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:25:06,460 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4, 11] total 21 [2019-10-15 03:25:06,460 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580997466] [2019-10-15 03:25:06,461 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-15 03:25:06,461 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:25:06,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-15 03:25:06,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2019-10-15 03:25:06,462 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 22 states. [2019-10-15 03:25:07,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:25:07,569 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2019-10-15 03:25:07,570 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-15 03:25:07,570 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 32 [2019-10-15 03:25:07,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:25:07,571 INFO L225 Difference]: With dead ends: 44 [2019-10-15 03:25:07,571 INFO L226 Difference]: Without dead ends: 29 [2019-10-15 03:25:07,573 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=210, Invalid=1272, Unknown=0, NotChecked=0, Total=1482 [2019-10-15 03:25:07,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-15 03:25:07,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-10-15 03:25:07,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-15 03:25:07,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2019-10-15 03:25:07,580 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 32 [2019-10-15 03:25:07,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:25:07,580 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2019-10-15 03:25:07,581 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-15 03:25:07,581 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2019-10-15 03:25:07,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-10-15 03:25:07,582 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:25:07,582 INFO L380 BasicCegarLoop]: trace histogram [12, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:25:07,785 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:25:07,794 INFO L410 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:25:07,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:25:07,794 INFO L82 PathProgramCache]: Analyzing trace with hash 132820922, now seen corresponding path program 3 times [2019-10-15 03:25:07,794 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:25:07,794 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668961936] [2019-10-15 03:25:07,794 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:25:07,794 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:25:07,795 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:25:07,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:25:07,940 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-10-15 03:25:07,940 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [668961936] [2019-10-15 03:25:07,940 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55982976] [2019-10-15 03:25:07,940 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:25:08,046 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 03:25:08,047 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 03:25:08,048 INFO L256 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-15 03:25:08,051 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:25:08,062 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-10-15 03:25:08,062 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:25:08,154 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-10-15 03:25:08,155 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [421427468] [2019-10-15 03:25:08,157 INFO L162 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-10-15 03:25:08,157 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:25:08,157 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:25:08,158 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:25:08,158 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:25:08,180 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:25:09,693 INFO L199 IcfgInterpreter]: Interpreting procedure max with input of size 1 for LOIs [2019-10-15 03:25:09,721 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:25:09,724 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:25:12,079 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:25:12,079 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 11] total 25 [2019-10-15 03:25:12,079 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770846067] [2019-10-15 03:25:12,080 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-15 03:25:12,081 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:25:12,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-15 03:25:12,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=515, Unknown=1, NotChecked=0, Total=650 [2019-10-15 03:25:12,082 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 26 states. [2019-10-15 03:25:13,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:25:13,009 INFO L93 Difference]: Finished difference Result 54 states and 68 transitions. [2019-10-15 03:25:13,009 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-15 03:25:13,010 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 42 [2019-10-15 03:25:13,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:25:13,011 INFO L225 Difference]: With dead ends: 54 [2019-10-15 03:25:13,011 INFO L226 Difference]: Without dead ends: 36 [2019-10-15 03:25:13,013 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=369, Invalid=1700, Unknown=1, NotChecked=0, Total=2070 [2019-10-15 03:25:13,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-15 03:25:13,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-10-15 03:25:13,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-15 03:25:13,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2019-10-15 03:25:13,022 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 42 [2019-10-15 03:25:13,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:25:13,022 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2019-10-15 03:25:13,022 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-15 03:25:13,023 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2019-10-15 03:25:13,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-10-15 03:25:13,024 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:25:13,024 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:25:13,236 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:25:13,237 INFO L410 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:25:13,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:25:13,238 INFO L82 PathProgramCache]: Analyzing trace with hash 944007491, now seen corresponding path program 4 times [2019-10-15 03:25:13,238 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:25:13,238 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518043975] [2019-10-15 03:25:13,239 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:25:13,239 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:25:13,239 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:25:13,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:25:13,436 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 03:25:13,436 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518043975] [2019-10-15 03:25:13,437 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [667995721] [2019-10-15 03:25:13,437 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 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 03:25:13,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:25:13,588 INFO L256 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-15 03:25:13,591 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:25:13,602 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 03:25:13,603 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:25:13,886 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 03:25:13,887 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1899780695] [2019-10-15 03:25:13,888 INFO L162 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-10-15 03:25:13,889 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:25:13,889 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:25:13,889 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:25:13,889 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:25:13,907 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:25:15,329 INFO L199 IcfgInterpreter]: Interpreting procedure max with input of size 1 for LOIs [2019-10-15 03:25:15,353 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:25:15,357 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:25:15,737 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:25:15,738 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 11] total 39 [2019-10-15 03:25:15,738 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888087587] [2019-10-15 03:25:15,740 INFO L442 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-10-15 03:25:15,740 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:25:15,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-10-15 03:25:15,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=1125, Unknown=0, NotChecked=0, Total=1560 [2019-10-15 03:25:15,741 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 40 states. [2019-10-15 03:25:17,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:25:17,291 INFO L93 Difference]: Finished difference Result 68 states and 89 transitions. [2019-10-15 03:25:17,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-10-15 03:25:17,292 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 49 [2019-10-15 03:25:17,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:25:17,293 INFO L225 Difference]: With dead ends: 68 [2019-10-15 03:25:17,293 INFO L226 Difference]: Without dead ends: 50 [2019-10-15 03:25:17,296 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1364 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1244, Invalid=4158, Unknown=0, NotChecked=0, Total=5402 [2019-10-15 03:25:17,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-10-15 03:25:17,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2019-10-15 03:25:17,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-10-15 03:25:17,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2019-10-15 03:25:17,305 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 49 [2019-10-15 03:25:17,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:25:17,305 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2019-10-15 03:25:17,305 INFO L463 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-10-15 03:25:17,305 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2019-10-15 03:25:17,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-15 03:25:17,307 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:25:17,307 INFO L380 BasicCegarLoop]: trace histogram [26, 12, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:25:17,512 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:25:17,512 INFO L410 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:25:17,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:25:17,513 INFO L82 PathProgramCache]: Analyzing trace with hash -1182307997, now seen corresponding path program 5 times [2019-10-15 03:25:17,513 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:25:17,513 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136071864] [2019-10-15 03:25:17,514 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:25:17,514 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:25:17,514 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:25:17,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:25:17,955 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-10-15 03:25:17,955 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136071864] [2019-10-15 03:25:17,955 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353802286] [2019-10-15 03:25:17,955 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 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 03:25:18,141 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 03:25:18,141 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 03:25:18,142 INFO L256 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 03:25:18,151 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:25:18,185 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 54 proven. 1 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2019-10-15 03:25:18,185 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:25:18,246 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2019-10-15 03:25:18,246 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2004013424] [2019-10-15 03:25:18,247 INFO L162 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-10-15 03:25:18,248 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:25:18,248 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:25:18,248 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:25:18,248 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:25:18,267 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:25:19,600 INFO L199 IcfgInterpreter]: Interpreting procedure max with input of size 1 for LOIs [2019-10-15 03:25:19,619 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:25:19,621 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:25:20,192 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:25:20,193 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 4, 4, 11] total 43 [2019-10-15 03:25:20,193 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525361289] [2019-10-15 03:25:20,194 INFO L442 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-10-15 03:25:20,195 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:25:20,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-10-15 03:25:20,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=449, Invalid=1443, Unknown=0, NotChecked=0, Total=1892 [2019-10-15 03:25:20,196 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 44 states. [2019-10-15 03:25:24,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:25:24,566 INFO L93 Difference]: Finished difference Result 72 states and 83 transitions. [2019-10-15 03:25:24,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-10-15 03:25:24,567 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 63 [2019-10-15 03:25:24,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:25:24,568 INFO L225 Difference]: With dead ends: 72 [2019-10-15 03:25:24,569 INFO L226 Difference]: Without dead ends: 54 [2019-10-15 03:25:24,571 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1349 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1349, Invalid=5456, Unknown=1, NotChecked=0, Total=6806 [2019-10-15 03:25:24,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-15 03:25:24,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2019-10-15 03:25:24,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-10-15 03:25:24,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2019-10-15 03:25:24,579 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 63 [2019-10-15 03:25:24,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:25:24,580 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2019-10-15 03:25:24,580 INFO L463 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-10-15 03:25:24,580 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2019-10-15 03:25:24,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-10-15 03:25:24,581 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:25:24,581 INFO L380 BasicCegarLoop]: trace histogram [27, 12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:25:24,794 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:25:24,794 INFO L410 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:25:24,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:25:24,794 INFO L82 PathProgramCache]: Analyzing trace with hash 2129164918, now seen corresponding path program 6 times [2019-10-15 03:25:24,795 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:25:24,795 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1706838454] [2019-10-15 03:25:24,795 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:25:24,795 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:25:24,796 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:25:24,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:25:25,183 INFO L134 CoverageAnalysis]: Checked inductivity of 499 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-15 03:25:25,183 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1706838454] [2019-10-15 03:25:25,183 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1655325630] [2019-10-15 03:25:25,183 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 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 03:25:25,402 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 03:25:25,402 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 03:25:25,404 INFO L256 TraceCheckSpWp]: Trace formula consists of 343 conjuncts, 29 conjunts are in the unsatisfiable core [2019-10-15 03:25:25,407 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:25:25,435 INFO L134 CoverageAnalysis]: Checked inductivity of 499 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-15 03:25:25,435 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:25:26,385 INFO L134 CoverageAnalysis]: Checked inductivity of 499 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-15 03:25:26,385 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [616127437] [2019-10-15 03:25:26,387 INFO L162 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-10-15 03:25:26,387 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:25:26,387 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:25:26,387 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:25:26,388 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:25:26,400 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:25:27,698 INFO L199 IcfgInterpreter]: Interpreting procedure max with input of size 1 for LOIs [2019-10-15 03:25:27,713 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:25:27,716 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:25:28,175 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:25:28,175 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 11] total 69 [2019-10-15 03:25:28,176 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504244579] [2019-10-15 03:25:28,177 INFO L442 AbstractCegarLoop]: Interpolant automaton has 70 states [2019-10-15 03:25:28,177 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:25:28,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2019-10-15 03:25:28,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1740, Invalid=3090, Unknown=0, NotChecked=0, Total=4830 [2019-10-15 03:25:28,180 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand 70 states. [2019-10-15 03:25:31,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:25:31,620 INFO L93 Difference]: Finished difference Result 104 states and 140 transitions. [2019-10-15 03:25:31,621 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2019-10-15 03:25:31,621 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 67 [2019-10-15 03:25:31,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:25:31,622 INFO L225 Difference]: With dead ends: 104 [2019-10-15 03:25:31,622 INFO L226 Difference]: Without dead ends: 83 [2019-10-15 03:25:31,628 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3929 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=5099, Invalid=12723, Unknown=0, NotChecked=0, Total=17822 [2019-10-15 03:25:31,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2019-10-15 03:25:31,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2019-10-15 03:25:31,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-10-15 03:25:31,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 87 transitions. [2019-10-15 03:25:31,638 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 87 transitions. Word has length 67 [2019-10-15 03:25:31,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:25:31,638 INFO L462 AbstractCegarLoop]: Abstraction has 83 states and 87 transitions. [2019-10-15 03:25:31,639 INFO L463 AbstractCegarLoop]: Interpolant automaton has 70 states. [2019-10-15 03:25:31,639 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 87 transitions. [2019-10-15 03:25:31,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2019-10-15 03:25:31,640 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:25:31,640 INFO L380 BasicCegarLoop]: trace histogram [56, 12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:25:31,842 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:25:31,843 INFO L410 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:25:31,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:25:31,843 INFO L82 PathProgramCache]: Analyzing trace with hash -332421779, now seen corresponding path program 7 times [2019-10-15 03:25:31,844 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:25:31,844 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861476830] [2019-10-15 03:25:31,844 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:25:31,845 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:25:31,845 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:25:31,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:25:33,254 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-15 03:25:33,254 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861476830] [2019-10-15 03:25:33,254 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1323277606] [2019-10-15 03:25:33,254 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:25:33,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:25:33,532 INFO L256 TraceCheckSpWp]: Trace formula consists of 517 conjuncts, 58 conjunts are in the unsatisfiable core [2019-10-15 03:25:33,537 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:25:33,566 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-15 03:25:33,566 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:25:35,025 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-15 03:25:35,025 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [731543046] [2019-10-15 03:25:35,026 INFO L162 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-10-15 03:25:35,027 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:25:35,027 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:25:35,028 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:25:35,028 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:25:35,043 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:25:36,211 INFO L199 IcfgInterpreter]: Interpreting procedure max with input of size 1 for LOIs [2019-10-15 03:25:36,238 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:25:36,240 INFO L183 IcfgInterpreter]: Interpretation finished