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-industry-pattern/check_removal_from_set_after_insertion.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:36:30,097 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:36:30,099 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:36:30,116 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:36:30,117 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:36:30,118 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:36:30,119 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:36:30,121 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:36:30,122 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:36:30,123 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:36:30,124 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:36:30,125 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:36:30,125 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:36:30,126 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:36:30,127 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:36:30,128 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:36:30,129 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:36:30,130 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:36:30,132 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:36:30,133 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:36:30,135 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:36:30,136 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:36:30,137 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:36:30,138 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:36:30,140 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:36:30,148 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:36:30,148 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:36:30,149 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:36:30,150 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 01:36:30,164 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:36:30,164 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:36:30,165 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:36:30,165 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:36:30,166 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:36:30,166 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:36:30,166 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:36:30,166 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:36:30,166 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:36:30,167 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:36:30,167 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:36:30,167 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:36:30,167 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:36:30,167 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:36:30,168 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:36:30,168 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:36:30,168 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:36:30,168 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:36:30,168 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:36:30,169 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:36:30,169 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:36:30,169 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:36:30,169 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:36:30,169 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:36:30,170 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:36:30,170 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:36:30,170 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:36:30,170 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:36:30,170 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 01:36:30,421 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:36:30,434 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:36:30,438 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:36:30,439 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:36:30,439 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:36:30,440 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/check_removal_from_set_after_insertion.c [2019-10-15 01:36:30,497 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c952e8c54/ce0826ed24db478bbadd2dd77f54d9b9/FLAGba6aefd72 [2019-10-15 01:36:30,959 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:36:30,960 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-industry-pattern/check_removal_from_set_after_insertion.c [2019-10-15 01:36:30,969 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c952e8c54/ce0826ed24db478bbadd2dd77f54d9b9/FLAGba6aefd72 [2019-10-15 01:36:31,318 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c952e8c54/ce0826ed24db478bbadd2dd77f54d9b9 [2019-10-15 01:36:31,328 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:36:31,330 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:36:31,331 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:36:31,331 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:36:31,334 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:36:31,336 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:36:31" (1/1) ... [2019-10-15 01:36:31,339 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3fbd8e3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:31, skipping insertion in model container [2019-10-15 01:36:31,339 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:36:31" (1/1) ... [2019-10-15 01:36:31,346 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:36:31,370 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:36:31,623 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:36:31,633 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:36:31,769 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:36:31,789 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:36:31,790 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:31 WrapperNode [2019-10-15 01:36:31,790 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:36:31,790 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:36:31,790 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:36:31,791 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:36:31,800 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:31" (1/1) ... [2019-10-15 01:36:31,801 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:31" (1/1) ... [2019-10-15 01:36:31,808 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:31" (1/1) ... [2019-10-15 01:36:31,808 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:31" (1/1) ... [2019-10-15 01:36:31,821 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:31" (1/1) ... [2019-10-15 01:36:31,829 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:31" (1/1) ... [2019-10-15 01:36:31,831 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:31" (1/1) ... [2019-10-15 01:36:31,834 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:36:31,834 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:36:31,834 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:36:31,835 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:36:31,835 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:31" (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 01:36:31,891 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:36:31,891 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:36:31,891 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:36:31,891 INFO L138 BoogieDeclarations]: Found implementation of procedure insert [2019-10-15 01:36:31,891 INFO L138 BoogieDeclarations]: Found implementation of procedure elem_exists [2019-10-15 01:36:31,891 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:36:31,892 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:36:31,892 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:36:31,892 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:36:31,892 INFO L130 BoogieDeclarations]: Found specification of procedure insert [2019-10-15 01:36:31,892 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:36:31,892 INFO L130 BoogieDeclarations]: Found specification of procedure elem_exists [2019-10-15 01:36:31,893 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:36:31,893 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:36:31,893 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:36:31,893 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:36:31,893 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:36:31,894 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:36:32,411 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:36:32,412 INFO L284 CfgBuilder]: Removed 6 assume(true) statements. [2019-10-15 01:36:32,413 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:36:32 BoogieIcfgContainer [2019-10-15 01:36:32,413 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:36:32,414 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:36:32,414 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:36:32,416 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:36:32,417 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:36:31" (1/3) ... [2019-10-15 01:36:32,418 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@105e6ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:36:32, skipping insertion in model container [2019-10-15 01:36:32,418 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:31" (2/3) ... [2019-10-15 01:36:32,418 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@105e6ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:36:32, skipping insertion in model container [2019-10-15 01:36:32,418 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:36:32" (3/3) ... [2019-10-15 01:36:32,420 INFO L109 eAbstractionObserver]: Analyzing ICFG check_removal_from_set_after_insertion.c [2019-10-15 01:36:32,429 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:36:32,436 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:36:32,446 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:36:32,467 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:36:32,467 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:36:32,467 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:36:32,467 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:36:32,468 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:36:32,468 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:36:32,468 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:36:32,468 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:36:32,484 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states. [2019-10-15 01:36:32,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-15 01:36:32,491 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:36:32,492 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:36:32,494 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:36:32,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:36:32,499 INFO L82 PathProgramCache]: Analyzing trace with hash -1837632078, now seen corresponding path program 1 times [2019-10-15 01:36:32,506 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:36:32,506 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1123347618] [2019-10-15 01:36:32,507 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:36:32,507 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:36:32,507 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:36:32,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:36:32,674 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 01:36:32,675 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1123347618] [2019-10-15 01:36:32,675 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:36:32,676 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:36:32,676 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273341281] [2019-10-15 01:36:32,681 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:36:32,681 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:36:32,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:36:32,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:36:32,700 INFO L87 Difference]: Start difference. First operand 37 states. Second operand 3 states. [2019-10-15 01:36:32,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:36:32,759 INFO L93 Difference]: Finished difference Result 57 states and 74 transitions. [2019-10-15 01:36:32,760 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:36:32,762 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-10-15 01:36:32,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:36:32,772 INFO L225 Difference]: With dead ends: 57 [2019-10-15 01:36:32,772 INFO L226 Difference]: Without dead ends: 34 [2019-10-15 01:36:32,776 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 01:36:32,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-15 01:36:32,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2019-10-15 01:36:32,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-15 01:36:32,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2019-10-15 01:36:32,824 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 15 [2019-10-15 01:36:32,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:36:32,825 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2019-10-15 01:36:32,825 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:36:32,825 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2019-10-15 01:36:32,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-15 01:36:32,827 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:36:32,827 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:36:32,827 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:36:32,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:36:32,828 INFO L82 PathProgramCache]: Analyzing trace with hash -659682392, now seen corresponding path program 1 times [2019-10-15 01:36:32,828 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:36:32,828 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2070377624] [2019-10-15 01:36:32,829 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:36:32,829 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:36:32,829 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:36:32,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:36:32,976 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:36:32,977 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2070377624] [2019-10-15 01:36:32,977 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595333464] [2019-10-15 01:36:32,977 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 01:36:33,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:36:33,038 INFO L256 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:36:33,044 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:36:33,078 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 01:36:33,078 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:36:33,119 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 01:36:33,119 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 01:36:33,120 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5] total 8 [2019-10-15 01:36:33,120 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100906315] [2019-10-15 01:36:33,122 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 01:36:33,122 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:36:33,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 01:36:33,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-15 01:36:33,123 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 6 states. [2019-10-15 01:36:33,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:36:33,313 INFO L93 Difference]: Finished difference Result 72 states and 90 transitions. [2019-10-15 01:36:33,315 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-15 01:36:33,316 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-10-15 01:36:33,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:36:33,319 INFO L225 Difference]: With dead ends: 72 [2019-10-15 01:36:33,319 INFO L226 Difference]: Without dead ends: 44 [2019-10-15 01:36:33,320 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-15 01:36:33,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-10-15 01:36:33,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 36. [2019-10-15 01:36:33,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-15 01:36:33,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2019-10-15 01:36:33,348 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 17 [2019-10-15 01:36:33,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:36:33,349 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2019-10-15 01:36:33,349 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 01:36:33,349 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2019-10-15 01:36:33,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-15 01:36:33,350 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:36:33,350 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:36:33,562 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:36:33,562 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:36:33,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:36:33,564 INFO L82 PathProgramCache]: Analyzing trace with hash -2055252280, now seen corresponding path program 1 times [2019-10-15 01:36:33,564 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:36:33,565 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1974481576] [2019-10-15 01:36:33,565 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:36:33,565 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:36:33,565 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:36:33,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:36:33,709 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:36:33,709 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1974481576] [2019-10-15 01:36:33,710 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796480563] [2019-10-15 01:36:33,710 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 01:36:33,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:36:33,764 INFO L256 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-15 01:36:33,766 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:36:33,812 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:36:33,812 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:36:33,869 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:36:33,869 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1516838068] [2019-10-15 01:36:33,893 INFO L162 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-10-15 01:36:33,894 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:36:33,900 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:36:33,907 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:36:33,908 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:36:34,071 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 26 for LOIs [2019-10-15 01:36:36,425 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2019-10-15 01:36:36,448 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:36:36,456 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:36:36,873 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-15 01:36:36,874 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [5, 6, 6] total 21 [2019-10-15 01:36:36,874 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119863792] [2019-10-15 01:36:36,876 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-15 01:36:36,876 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:36:36,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-15 01:36:36,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2019-10-15 01:36:36,878 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand 11 states. [2019-10-15 01:36:37,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:36:37,188 INFO L93 Difference]: Finished difference Result 57 states and 70 transitions. [2019-10-15 01:36:37,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-15 01:36:37,189 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 19 [2019-10-15 01:36:37,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:36:37,190 INFO L225 Difference]: With dead ends: 57 [2019-10-15 01:36:37,190 INFO L226 Difference]: Without dead ends: 43 [2019-10-15 01:36:37,192 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 38 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=106, Invalid=446, Unknown=0, NotChecked=0, Total=552 [2019-10-15 01:36:37,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-10-15 01:36:37,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 37. [2019-10-15 01:36:37,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-10-15 01:36:37,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2019-10-15 01:36:37,203 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 19 [2019-10-15 01:36:37,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:36:37,203 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2019-10-15 01:36:37,203 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-15 01:36:37,204 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2019-10-15 01:36:37,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 01:36:37,205 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:36:37,205 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:36:37,408 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:36:37,409 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:36:37,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:36:37,410 INFO L82 PathProgramCache]: Analyzing trace with hash 1072893512, now seen corresponding path program 1 times [2019-10-15 01:36:37,411 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:36:37,411 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638293665] [2019-10-15 01:36:37,411 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:36:37,412 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:36:37,412 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:36:37,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:36:37,491 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:36:37,491 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638293665] [2019-10-15 01:36:37,492 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:36:37,492 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:36:37,493 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137583950] [2019-10-15 01:36:37,493 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:36:37,493 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:36:37,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:36:37,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:36:37,494 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand 4 states. [2019-10-15 01:36:37,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:36:37,513 INFO L93 Difference]: Finished difference Result 69 states and 83 transitions. [2019-10-15 01:36:37,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:36:37,514 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 28 [2019-10-15 01:36:37,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:36:37,515 INFO L225 Difference]: With dead ends: 69 [2019-10-15 01:36:37,516 INFO L226 Difference]: Without dead ends: 41 [2019-10-15 01:36:37,517 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:36:37,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-10-15 01:36:37,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2019-10-15 01:36:37,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-10-15 01:36:37,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2019-10-15 01:36:37,536 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 28 [2019-10-15 01:36:37,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:36:37,537 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2019-10-15 01:36:37,537 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:36:37,538 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2019-10-15 01:36:37,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-15 01:36:37,539 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:36:37,540 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:36:37,540 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:36:37,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:36:37,540 INFO L82 PathProgramCache]: Analyzing trace with hash 2012221557, now seen corresponding path program 1 times [2019-10-15 01:36:37,541 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:36:37,541 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517740121] [2019-10-15 01:36:37,541 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:36:37,541 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:36:37,541 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:36:37,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:36:37,646 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 01:36:37,647 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517740121] [2019-10-15 01:36:37,647 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167720382] [2019-10-15 01:36:37,648 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 01:36:37,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:36:37,704 INFO L256 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-15 01:36:37,706 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:36:37,738 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:36:37,738 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:36:37,795 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:36:37,795 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1508449925] [2019-10-15 01:36:37,797 INFO L162 IcfgInterpreter]: Started Sifa with 26 locations of interest [2019-10-15 01:36:37,797 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:36:37,798 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:36:37,798 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:36:37,799 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:36:37,854 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 26 for LOIs [2019-10-15 01:36:38,920 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2019-10-15 01:36:38,928 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:36:38,932 INFO L199 IcfgInterpreter]: Interpreting procedure elem_exists with input of size 3 for LOIs [2019-10-15 01:36:38,946 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:36:39,864 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:36:39,864 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6, 21] total 32 [2019-10-15 01:36:39,864 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549821394] [2019-10-15 01:36:39,865 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-10-15 01:36:39,865 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:36:39,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-10-15 01:36:39,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=852, Unknown=0, NotChecked=0, Total=992 [2019-10-15 01:36:39,867 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand 32 states. [2019-10-15 01:36:43,849 WARN L191 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 35 [2019-10-15 01:36:45,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:36:45,312 INFO L93 Difference]: Finished difference Result 212 states and 288 transitions. [2019-10-15 01:36:45,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2019-10-15 01:36:45,317 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 29 [2019-10-15 01:36:45,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:36:45,322 INFO L225 Difference]: With dead ends: 212 [2019-10-15 01:36:45,322 INFO L226 Difference]: Without dead ends: 179 [2019-10-15 01:36:45,326 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2447 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1302, Invalid=6354, Unknown=0, NotChecked=0, Total=7656 [2019-10-15 01:36:45,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2019-10-15 01:36:45,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 58. [2019-10-15 01:36:45,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-15 01:36:45,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2019-10-15 01:36:45,347 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 29 [2019-10-15 01:36:45,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:36:45,348 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2019-10-15 01:36:45,348 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-10-15 01:36:45,348 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2019-10-15 01:36:45,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-10-15 01:36:45,349 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:36:45,349 INFO L380 BasicCegarLoop]: trace histogram [6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:36:45,553 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:36:45,554 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:36:45,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:36:45,554 INFO L82 PathProgramCache]: Analyzing trace with hash 1337455549, now seen corresponding path program 2 times [2019-10-15 01:36:45,554 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:36:45,554 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2114002121] [2019-10-15 01:36:45,555 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:36:45,555 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:36:45,555 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:36:45,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:36:45,651 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-15 01:36:45,651 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2114002121] [2019-10-15 01:36:45,651 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:36:45,651 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 01:36:45,652 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132288937] [2019-10-15 01:36:45,652 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:36:45,652 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:36:45,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:36:45,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:36:45,653 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand 5 states. [2019-10-15 01:36:45,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:36:45,706 INFO L93 Difference]: Finished difference Result 110 states and 134 transitions. [2019-10-15 01:36:45,706 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 01:36:45,706 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 34 [2019-10-15 01:36:45,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:36:45,708 INFO L225 Difference]: With dead ends: 110 [2019-10-15 01:36:45,708 INFO L226 Difference]: Without dead ends: 65 [2019-10-15 01:36:45,709 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:36:45,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-10-15 01:36:45,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 61. [2019-10-15 01:36:45,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-10-15 01:36:45,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 72 transitions. [2019-10-15 01:36:45,721 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 72 transitions. Word has length 34 [2019-10-15 01:36:45,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:36:45,721 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 72 transitions. [2019-10-15 01:36:45,721 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 01:36:45,721 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 72 transitions. [2019-10-15 01:36:45,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-15 01:36:45,723 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:36:45,723 INFO L380 BasicCegarLoop]: trace histogram [6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:36:45,724 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:36:45,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:36:45,724 INFO L82 PathProgramCache]: Analyzing trace with hash -783299171, now seen corresponding path program 1 times [2019-10-15 01:36:45,724 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:36:45,724 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361353562] [2019-10-15 01:36:45,725 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:36:45,725 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:36:45,725 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:36:45,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:36:45,819 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:36:45,819 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361353562] [2019-10-15 01:36:45,819 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1720300958] [2019-10-15 01:36:45,819 INFO L94 rtionOrderModulation]: Keeping assertion order 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 01:36:45,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:36:45,920 INFO L256 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-15 01:36:45,933 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:36:46,011 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:36:46,011 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:36:46,112 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:36:46,113 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [41510074] [2019-10-15 01:36:46,115 INFO L162 IcfgInterpreter]: Started Sifa with 29 locations of interest [2019-10-15 01:36:46,115 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:36:46,115 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:36:46,116 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:36:46,116 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:36:46,141 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 26 for LOIs [2019-10-15 01:36:49,964 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2019-10-15 01:36:49,971 INFO L199 IcfgInterpreter]: Interpreting procedure insert with input of size 9 for LOIs [2019-10-15 01:36:49,974 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:36:49,977 INFO L199 IcfgInterpreter]: Interpreting procedure elem_exists with input of size 48 for LOIs [2019-10-15 01:36:49,993 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:36:51,227 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:36:51,228 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 24] total 48 [2019-10-15 01:36:51,228 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518859818] [2019-10-15 01:36:51,229 INFO L442 AbstractCegarLoop]: Interpolant automaton has 48 states [2019-10-15 01:36:51,230 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:36:51,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2019-10-15 01:36:51,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=1922, Unknown=0, NotChecked=0, Total=2256 [2019-10-15 01:36:51,234 INFO L87 Difference]: Start difference. First operand 61 states and 72 transitions. Second operand 48 states. [2019-10-15 01:36:53,310 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 47 [2019-10-15 01:36:56,061 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 48 [2019-10-15 01:36:58,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:36:58,304 INFO L93 Difference]: Finished difference Result 290 states and 378 transitions. [2019-10-15 01:36:58,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2019-10-15 01:36:58,305 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 37 [2019-10-15 01:36:58,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:36:58,308 INFO L225 Difference]: With dead ends: 290 [2019-10-15 01:36:58,308 INFO L226 Difference]: Without dead ends: 241 [2019-10-15 01:36:58,312 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4433 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=2020, Invalid=11090, Unknown=0, NotChecked=0, Total=13110 [2019-10-15 01:36:58,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2019-10-15 01:36:58,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 93. [2019-10-15 01:36:58,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2019-10-15 01:36:58,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 110 transitions. [2019-10-15 01:36:58,337 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 110 transitions. Word has length 37 [2019-10-15 01:36:58,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:36:58,338 INFO L462 AbstractCegarLoop]: Abstraction has 93 states and 110 transitions. [2019-10-15 01:36:58,338 INFO L463 AbstractCegarLoop]: Interpolant automaton has 48 states. [2019-10-15 01:36:58,338 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 110 transitions. [2019-10-15 01:36:58,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-10-15 01:36:58,340 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:36:58,340 INFO L380 BasicCegarLoop]: trace histogram [14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:36:58,541 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:36:58,542 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:36:58,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:36:58,543 INFO L82 PathProgramCache]: Analyzing trace with hash 1625033245, now seen corresponding path program 2 times [2019-10-15 01:36:58,543 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:36:58,544 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [577785109] [2019-10-15 01:36:58,544 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:36:58,544 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:36:58,544 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:36:58,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:36:58,758 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:36:58,759 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [577785109] [2019-10-15 01:36:58,759 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219494541] [2019-10-15 01:36:58,759 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 01:36:58,930 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:36:58,930 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:36:58,931 INFO L256 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:36:58,934 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:36:58,970 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2019-10-15 01:36:58,971 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:36:59,016 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2019-10-15 01:36:59,016 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1885351916] [2019-10-15 01:36:59,018 INFO L162 IcfgInterpreter]: Started Sifa with 29 locations of interest [2019-10-15 01:36:59,018 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:36:59,018 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:36:59,018 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:36:59,019 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:36:59,046 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 26 for LOIs [2019-10-15 01:37:04,324 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2019-10-15 01:37:04,332 INFO L199 IcfgInterpreter]: Interpreting procedure insert with input of size 9 for LOIs [2019-10-15 01:37:04,336 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-10-15 01:37:04,339 INFO L199 IcfgInterpreter]: Interpreting procedure elem_exists with input of size 48 for LOIs [2019-10-15 01:37:04,347 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:37:05,658 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:37:05,658 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 5, 5, 24] total 46 [2019-10-15 01:37:05,659 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837102891] [2019-10-15 01:37:05,660 INFO L442 AbstractCegarLoop]: Interpolant automaton has 46 states [2019-10-15 01:37:05,660 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:37:05,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2019-10-15 01:37:05,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=1828, Unknown=0, NotChecked=0, Total=2070 [2019-10-15 01:37:05,661 INFO L87 Difference]: Start difference. First operand 93 states and 110 transitions. Second operand 46 states. [2019-10-15 01:37:07,644 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 41